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Journal articles on the topic 'Catalytic hydrogenation of CO2̲'

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Published: 4 June 2021
Last updated: 5 February 2022

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1

Spadaro, Lorenzo, Alessandra Palella, and Francesco Arena. "Totally-green Fuels via CO2 Hydrogenation." Bulletin of Chemical Reaction Engineering & Catalysis 15, no. 2 (April 23, 2020): 390–404. http://dx.doi.org/10.9767/bcrec.15.2.7168.390-404.

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Hydrogen is the cleanest energy vector among any fuels, nevertheless, many aspects related to its distribution and storage still raise serious questions concerning costs, infrastructure and safety. On this account, the chemical storage of renewable-hydrogen by conversion into green-fuels, such as: methanol, via CO2 hydrogenation assumes a role of primary importance, also in the light of a cost-to-benefit analysis. Therefore, this paper investigates the effects of chemical composition on the structural properties, surface reactivity and catalytic pathway of ternary CuO-ZnO-CeO2 systems, shedding light on the structure-activity relationships. Thus, a series of CuZnCeO2 catalysts, at different CuO/CeO2 ratio (i.e. 0.2-1.2) were performed in the CO2 hydrogenation reactions at 20 bar and 200-300 °C, (GHSV of 4800 STP L∙kg∙cat-1∙h-1). Catalysts were characterized by several techniques including X-ray Diffraction (XRD), N2-physisorption, single-pulse N2O titrations, X-ray Photoelectron Spectroscopy (XPS), and Temperature-programmed Reduction with H2 (H2-TPR). Depending on preparation method, the results clearly diagnostics the occurrence of synergistic structural-electronic effects of cerium oxide on copper activity, with an optimal 0.5 copper-to-cerium content. The rise of CuO loading up to 30% drives to a considerable increase of hydrogenation activity: C2Z1-C catalyst obtains the best catalytic performance, reaching methanol yield value of 12% at 300 °C. Catalyst activity proceeds according to volcano-shaped relationships, in agreement with a dual sites mechanism. Copyright © 2020 BCREC Group. All rights reserved
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2

Tagiyeva, Sh F., and E. H. Ismailov. "HETEROGENEOUS CATALYTIC HYDROGENATION OF CARBON DIOXIDE INTO HYDROCARBONS: ACHIEVEMENTS AND PROSPECTS." Chemical Problems 18, no. 4 (2020): 485–500. http://dx.doi.org/10.32737/2221-8688-2020-4-485-500.

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The works published over the past 10 years on the catalytic hydrogenation of carbon dioxide into methane and C2+ hydrocarbons are considered. The choice of catalysts based on their elemental and phase composition, structural-porous characteristics, grain-size and acidic properties, the reaction mechanism and problems and prospects for the industrial application of heterogeneous catalytic conversion of CO2 to hydrocarbons are discussed.
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3

Qaderi, Jawed. "A brief review on the reaction mechanisms of CO2 hydrogenation into methanol." International Journal of Innovative Research and Scientific Studies 3, no. 2 (May 11, 2020): 33–40. http://dx.doi.org/10.53894/ijirss.v3i2.31.

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The catalytic reduction of CO2 to methanol is an appealing option to reduce greenhouse gas concentration as well as renewable energy production. In addition, the exhaustion of fossil fuel, increase in earth temperature and sharp increases in fuel prices are the main driving factor for exploring the synthesis of methanol by hydrogenating CO2. Many studies on the catalytic hydrogenation of CO2 to methanol were published in the literature over the last few decades. Many of the studies have presented different catalysts having high stability, higher performance, low cost, and are immediately required to promote conversion. Understanding the mechanisms involved in the conversion of CO2 is essential as the first step towards creating these catalysts. This review briefly summarizes recent theoretical developments in mechanistic studies focused on using density functional theory, kinetic Monte Carlo simulations, and microkinetics modeling. Based on these simulation techniques on different transition metals, metal/metal oxide, and other heterogeneous catalysts surfaces, mainly, three important mechanisms that have been recommended are the formate (HCOO), reverse water–gas shift (RWGS), and trans-COOH mechanisms. Recent experimental and theoretical efforts appear to demonstrate that the formate route in which the main intermediate species is H2CO* in the reaction route, is more favorable in catalytic hydrogenation of CO2 to chemical fuels in various temperature and pressure conditions.
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4

Srivastava, Vivek. "Hydrotalcite Anchored Ruthenium Catalyst for CO2 Hydrogenation Reaction." Letters in Organic Chemistry 16, no. 5 (April 1, 2019): 396–408. http://dx.doi.org/10.2174/1570178615666180816120058.

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We developed a series of new hydrotalcite functionalized Ru catalytic system to synthesize formic acid via CO2 hydrogenation reaction. Advance analytical procedures like FTIR, N2 physisorption, ICP-OES, XPS, and TEM analysis were applied to understand the physiochemical nature of functionalized hydrotalcite materials. This well-analyzed system was used as catalysts for CO2 hydrogenation reaction (with and without ionic liquid medium). Ru metal containing functionalized hydrotalcite materials were found highly active catalysts for formic acid synthesis via hydrogenation reaction. The concern of catalyst stability was studied via catalysts leaching and recycling experiments. We recycled the ionic liquid mediated functionalized hydrotalcite catalytic system up to 8 runs without any significant loss of catalytic activity. Surprisingly, no sign of catalyst leaching was recorded during the catalyst recycling experiment.
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5

Jia, Miao Yao, Wen Gui Gao, Hua Wang, and Yu Hao Wang. "Effect of Silica Promoter on Performance of CuO-ZnO-ZrO2 Catalyst for Methanol Synthesis from CO2 Hydrogenation." Applied Mechanics and Materials 556-562 (May 2014): 117–22. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.117.

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Various CuO-ZnO-ZrO2(CZZ) catalysts for methanol synthesis from CO2 hydrogenation were prepared by co-precipitation method. Small amount of silica was incorporated into CZZ catalyst to produce these modified ternary CZZ catalysts. The effects of silica on physicochemical and catalytic properties were studied by TG-DTG,XRD,BET,N2O chemisorption,H2-TPR,NH3-TPD and CO2-TPD techniques. The results show that the properties of catalysts were strongly influenced by the content of SiO2 used as promoter. The catalytic performance for methanol synthesis from CO2 hydrogenation was evaluated. The test results show that the CZZ catalyst modified with 4 wt.% SiO2 exhibits an optimum catalytic activity. The silica improves the dispersion of CuO and its modified CZZ catalysts exhibits higher specific surface area, which were confirmed to be responsible for excellent performance of the catalysts for methanol synthesis from CO2 hydrogenation.
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6

Choi, Jonghoon, and Yunho Lee. "Catalytic hydrogenation of CO2 at a structurally rigidified cobalt center." Inorganic Chemistry Frontiers 7, no. 9 (2020): 1845–50. http://dx.doi.org/10.1039/c9qi01431d.

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7

Li, Yong, Zheng Wang, and Qingbin Liu. "Progress in Homogeneous Catalytic Hydrogenation of CO2." Chinese Journal of Organic Chemistry 37, no. 8 (2017): 1978. http://dx.doi.org/10.6023/cjoc201702038.

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8

Stephenson, Phil, Peter Licence, Stephen K. Ross, and Martyn Poliakoff. "Continuous catalytic asymmetric hydrogenation in supercritical CO2." Green Chemistry 6, no. 10 (2004): 521. http://dx.doi.org/10.1039/b411955j.

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9

ERDOHELYI, A. "Catalytic hydrogenation of CO2 over supported palladium." Journal of Catalysis 98, no. 1 (March 1986): 166–77. http://dx.doi.org/10.1016/0021-9517(86)90306-4.

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10

Kovaleva, Anastasiya. "Selectivity regulation of perovskite-based iron-manganese catalysts for the synthesis of light olefins from CO, CO2 and H2." Farmacevticheskoe delo i tehnologija lekarstv (Pharmacy and Pharmaceutical Technology), no. 2 (April 1, 2020): 8–23. http://dx.doi.org/10.33920/med-13-2002-01.

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There is a solution to prevent global problems caused due to carbon dioxide increase in planet atmosphere – reuse of CO2 in hydrogenation reaction. Literature analysis provides information about catalytic conversion of synthesis gas and carbon dioxide to carbohydrates in modern catalytic systems. Actual investigation of catalytic properties in GdFeO3 and GdMnO3 systems with perovskite structure has been carried out in the joint hydrogenation of carbon mono- and dioxide. Scientific novelty of research is to determine influence of the catalyst composition and reaction medium composition on the selectivity of target products.
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11

Bordet, Alexis, Sami El Sayed, Matthew Sanger, Kyle J. Boniface, Deepti Kalsi, Kylie L. Luska, Philip G. Jessop, and Walter Leitner. "Selectivity control in hydrogenation through adaptive catalysis using ruthenium nanoparticles on a CO2-responsive support." Nature Chemistry 13, no. 9 (July 5, 2021): 916–22. http://dx.doi.org/10.1038/s41557-021-00735-w.

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AbstractWith the advent of renewable carbon resources, multifunctional catalysts are becoming essential to hydrogenate selectively biomass-derived substrates and intermediates. However, the development of adaptive catalytic systems, that is, with reversibly adjustable reactivity, able to cope with the intermittence of renewable resources remains a challenge. Here, we report the preparation of a catalytic system designed to respond adaptively to feed gas composition in hydrogenation reactions. Ruthenium nanoparticles immobilized on amine-functionalized polymer-grafted silica act as active and stable catalysts for the hydrogenation of biomass-derived furfural acetone and related substrates. Hydrogenation of the carbonyl group is selectively switched on or off if pure H2 or a H2/CO2 mixture is used, respectively. The formation of alkylammonium formate species by the catalytic reaction of CO2 and H2 at the amine-functionalized support has been identified as the most likely molecular trigger for the selectivity switch. As this reaction is fully reversible, the catalyst performance responds almost in real time to the feed gas composition.
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12

Gao, Hui, Limin Chen, Jinzhu Chen, Yuanyuan Guo, and Daiqi Ye. "A computational study on the hydrogenation of CO2 catalyzed by a tetraphos-ligated cobalt complex: monohydride vs. dihydride." Catalysis Science & Technology 5, no. 2 (2015): 1006–13. http://dx.doi.org/10.1039/c4cy01031k.

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13

Cui, Yuanyuan, Xi Chen, and Wei-Lin Dai. "Continuous heterogeneous hydrogenation of CO2-derived dimethyl carbonate to methanol over a Cu-based catalyst." RSC Advances 6, no. 73 (2016): 69530–39. http://dx.doi.org/10.1039/c6ra14447k.

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Copper content played a significant role in the catalytic performance of Cu/SiO2 catalysts in dimethyl carbonate hydrogenation to methanol. Optimized hydrogenation activity was achieved over the 40Cu/SiO2 sample.
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14

Zhao, Zhengyang, Pei Yu, Bhuvana K. Shanbhag, Phillip Holt, Yu Lin Zhong, and Lizhong He. "Sustainable Recycling of Formic Acid by Bio-Catalytic CO2 Capture and Re-Hydrogenation." C 5, no. 2 (May 1, 2019): 22. http://dx.doi.org/10.3390/c5020022.

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Formic acid (FA) is a promising reservoir for hydrogen storage and distribution. Its dehydrogenation releases CO2 as a by-product, which limits its practical application. A proof of concept for a bio-catalytic system that simultaneously combines the dehydrogenation of formic acid for H2, in-situ capture of CO2 and its re-hydrogenation to reform formic acid is demonstrated. Enzymatic reactions catalyzed by carbonic anhydrase (CA) and formate dehydrogenase (FDH) under ambient condition are applied for in-situ CO2 capture and re-hydrogenation, respectively, to develop a sustainable system. Continuous production of FA from stripped CO2 was achieved at a rate of 40% using FDH combined with sustainable co-factor regeneration achieved by electrochemistry. In this study, the complete cycle of FA dehydrogenation, CO2 capture, and re-hydrogenation of CO2 to FA has been demonstrated in a single system. The proposed bio-catalytic system has the potential to reduce emissions of CO2 during H2 production from FA by effectively using it to recycle FA for continuous energy supply.
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15

Li, Lin, Chen Zhang, Xinqing Chen, Peng Gao, Jian Sun, Hui Wang, and Yuhan Sun. "Preparation of Highly Dispersion CuO/MCM-41 Catalysts for CO2 Hydrogenation." Journal of Nanoscience and Nanotechnology 19, no. 6 (June 1, 2019): 3218–22. http://dx.doi.org/10.1166/jnn.2019.16587.

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CuO/MCM-41 catalyst was synthesized by a simple method with the modification of ethylene glycol (EG) and characterized by powder X-ray diffraction (XRD), nitrogen sorption, scanning electron microscopy (SEM) and transmission electron microscope (SEM). Its catalytic performance in the hydrogenation of CO2 to methanol was also investigated. The results indicated that the as-synthesized CuO/MCM-41-EG catalyst took the properties of high dispersion, small particle size and high surface area, and then showed catalytic performance for the CO2 hydrogenation to methanol. At the optimum reaction temperature of 240 °C, the CuO/MCM-41-EG catalyst gave 15% CO2 conversion and 35% methanol selectivity.
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16

Liu, Xiaoyun, Bing Qiu, and Xinzheng Yang. "Bioinspired Design and Computational Prediction of SCS Nickel Pincer Complexes for Hydrogenation of Carbon Dioxide." Catalysts 10, no. 3 (March 11, 2020): 319. http://dx.doi.org/10.3390/catal10030319.

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Inspired by the structures of the active site of lactate racemase and H2 activation mechanism of mono-iron hydrogenase, we proposed a series of sulphur–carbon–sulphur (SCS) nickel complexes and computationally predicted their potentials for catalytic hydrogenation of CO2. Density functional theory calculations reveal a metal–ligand cooperated mechanism with the participation of a sulfur atom in the SCS pincer ligand as a proton receiver for the heterolytic cleavage of H2. For all newly proposed complexes containing functional groups with different electron-donating and withdrawing abilities in the SCS ligand, the predicted free energy barriers for the hydrogenation of CO2 to formic acid are in a range of 22.2–25.5 kcal/mol in water. Such a small difference in energy barriers indicates limited contributions of those functional groups to the charge density of the metal center. We further explored the catalytic mechanism of the simplest model complex for hydrogenation of formic acid to formaldehyde and obtained a total free energy barrier of 34.6 kcal/mol for the hydrogenation of CO2 to methanol.
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17

Wang, Chunling, Siyuan Fang, Songhai Xie, Ying Zheng, and Yun Hang Hu. "Thermo-photo catalytic CO2 hydrogenation over Ru/TiO2." Journal of Materials Chemistry A 8, no. 15 (2020): 7390–94. http://dx.doi.org/10.1039/c9ta13275a.

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18

Liu, Na, Jie Lei, Meng Yao Li, and Peng Wang. "The Influence of Preparation Procedures on Hydrogenation CO2 to Formic Acid over Supported Ru Catalysts." Advanced Materials Research 881-883 (January 2014): 283–86. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.283.

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A series of catalysts made of ruthenium loaded on γ-Al2O3 nanorods were prepared to study the effects of preparation procedure on their catalytic performances for hydrogenation CO2 to formic acid. The catalysts are characterized by XRD, nitrogen adsorption measurement and H2-TPR in detail. The results reveal that the catalytic activity is determined by the structure of supported ruthenium oxide species. The dispersion of RuOx is influenced by the preparation procedures. Optimal activity of catalyst for the hydrogenation of CO2 to formic acid is achieved over a γ-Al2O3 nanorods supported 2.0 wt% ruthenium catalyst, which is prepared by calcinations at 573 K in flowing air for 6h.
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19

Han, Zhen Xing, Si Xi Guo, Kai Ming Li, Bing Yao, Ming Song, Jing Li, Wen You Zhu, Jie Zhu, Yan Xu, and Xi Hua Du. "Preparation of Ni/ZrO2/SiO2 Catalyst and its Application in Hydrogenation of CO2 to Methane." Materials Science Forum 1001 (July 2020): 79–83. http://dx.doi.org/10.4028/www.scientific.net/msf.1001.79.

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The hydrogenation of CO2 to CH4 can realize the utilization of CO2, which has an important implications to both the energy and environment. As a result of the low catalytic activity of the supported Ni/SiO2 catalyst, the ZrO2 is added to improve its catalytic performance by the impregnation method. The experimental results show that ZrO2 is an effective promoter to enhance the low-temperature catalytic activity of Ni/SiO2 catalyst.
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20

Tasfy, Sara Faiz Hanna, Noor Asmawati Mohd Zabidi, Maizatul S. Shaharun, and Duvvuri Subbarao. "The Influence of Mn, Zr and Pb Promoters on the Performance of Cu/ZnO/SBA-15 Catalyst for Hydrogenation of CO2 to Methanol." Defect and Diffusion Forum 365 (July 2015): 178–82. http://dx.doi.org/10.4028/www.scientific.net/ddf.365.178.

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The present work investigates the hydrogenation of CO2 to methanol via a promoted Cu/ZnO/SBA-15 catalyst. In order to understand the effect of Mn, Zr and Pb promoters on the catalytic activity of Cu/Zn/SBA-15 catalysts, the hydrogenation of CO2 was performed in a stirred high-pressure reactor at 483K, 22.5bar, and a H2/CO2 ration of 3. The physicochemical properties of the catalysts were studied using N2 physical adsorption, TEM and H2-TPR. The characteristics of catalysts depended on the type of promoter and it influenced their catalytic performance. The Mn and Zr promoters resulted in a larger surface area of the catalyst and improved catalytic activity and methanol selectivity. However, an opposite effect was found for the Pb promoter. A 10% improvement on the CO2 conversion and 20% on the methanol selectivity was achieved due to the double promotion effect of Mn and Zr on Cu/ZnO-SBA-15 catalyst.
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21

Qu, Ya Kun, Xiao Guang Zhao, Li Xin Wang, and Yu Wu. "Na2O Promotion on CO2 Hydrogenation on the χ-Fe5C2(2 0 0) Surface." Key Engineering Materials 872 (January 2021): 85–89. http://dx.doi.org/10.4028/www.scientific.net/kem.872.85.

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Understanding the origin of the high activity of Na2O promotion on the χ-Fe5C2(2 0 0) surface during CO2 hydrogenation is imperative. In this work, we revealed how Na2O promoted the catalytic performance of χ-Fe5C2 during CO2 hydrogenation. Detailed analyses confirmed that Na2O addition facilitated the adsorption of CO2 and promoted the desorption of product (C2H4). Electronic structure calculations suggested that the electron donating ability of Na could enhance the dissociation of CO2, which is essential for producing hydrocarbons from CO2.
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22

Qu, Ya Kun, Xiao Guang Zhao, Li Xin Wang, and Yu Wu. "Na2O Promotion on CO2 Hydrogenation on the χ-Fe5C2(2 0 0) Surface." Key Engineering Materials 872 (January 2021): 85–89. http://dx.doi.org/10.4028/www.scientific.net/kem.872.85.

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Understanding the origin of the high activity of Na2O promotion on the χ-Fe5C2(2 0 0) surface during CO2 hydrogenation is imperative. In this work, we revealed how Na2O promoted the catalytic performance of χ-Fe5C2 during CO2 hydrogenation. Detailed analyses confirmed that Na2O addition facilitated the adsorption of CO2 and promoted the desorption of product (C2H4). Electronic structure calculations suggested that the electron donating ability of Na could enhance the dissociation of CO2, which is essential for producing hydrocarbons from CO2.
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23

Evdokimenko, Nikolay D., Alexander L. Kustov, Konstantin O. Kim, Igor V. Mishin, Vera D. Nissenbaum, Genadiy I. Kapustin, Timur R. Aymaletdinov, and Leonid M. Kustov. "Ce–Zr materials with a high surface area as catalyst supports for hydrogenation of CO2." Functional Materials Letters 13, no. 04 (April 14, 2020): 2040004. http://dx.doi.org/10.1142/s1793604720400044.

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The most promising way of CO2 utilization is its catalytic conversion into valuable products, in particular, the direct hydrogenation of CO2 on heterogeneous catalysts to obtain such products as synthesis gas, hydrocarbons, alcohols, esters, carboxylic acids, and some other organic molecules. Heterogeneous iron-based catalysts possess a special position among the promising candidates for the synthesis of CO2-based hydrocarbons. However, individual iron oxide catalysts have a fairly low surface area, which requires their deposition on the support or modification. CeO2 is rather attractive in catalysis because of its high oxygen storage capacity. The most effective thermal stabilizer of CeO2 is ZrO2. In this work, cerium–zirconium systems with various Ce to Zr ratios were synthesized by the method of coprecipitation in the absence and presence of the hexadecyltrimethylammonium bromide template. These systems were characterized by adsorption of N2, XRD, and DTA-TG-DTG and used as supports for 5% Fe catalysts. The activity of synthesized Fe-containing catalysts was investigated in the reaction of CO2 hydrogenation. The developed surface and the presence of cerium in the supports are the possible reasons for the high activity of Fe-containing catalysts in the hydrogenation reaction of CO2.
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24

Luo, Laitao, Li Songjun, and Yu Zhu. "The effects of yttrium on the hydrogenation performance and surface properties of a ruthenium-supported catalyst." Journal of the Serbian Chemical Society 70, no. 12 (2005): 1419–25. http://dx.doi.org/10.2298/jsc0512419l.

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The effects of yttrium on the hydrogenation performance and surface properties of a Ru/sepiolite catalyst were studied. With CO2 methanation and CS2 poisoning as the testing reactons, TPR, TPD, XRD and CO chemisorption as the characterizations, the results showed that the presence of yttrium can increase the hydrogenation activity and anti-poisoning capacity of the Ru/sepiolite catalyst, which is due to a change of surface properties of the Ru/sepiolite. In the process of the catalytic reaction, the adjusting behavior of yttrium for the Ru/sepiolite catalyst aids in increasing the catalytic activity and anti-poisoning capacity of the catalyst.
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25

Tasfy, Sara Faiz Hanna, Noor Asmawati Mohd Zabidi, Maizatul Shima Shaharun, Duvvria Subbarao, and Ahmed Elbagir. "Carbon Dioxide Hydrogenation to Methanol over Cu/ZnO-SBA-15 Catalyst: Effect of Metal Loading." Defect and Diffusion Forum 380 (November 2017): 151–60. http://dx.doi.org/10.4028/www.scientific.net/ddf.380.151.

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Utilization of CO2 as a carbon source to produce valuable chemicals is one of the important ways to reduce the global warming caused by increasing CO2 in the atmosphere. Supported metal catalysts are crucial to produce clean and renewable fuels and chemicals from the stable CO2 molecules. The catalytic conversion of CO2 into methanol is recently under increased scrutiny as an opportunity to be used as a low-cost carbon source. Therefore, a series of the bimetallic Cu/ZnO-based catalyst supported by SBA-15 were synthesized via an impregnation technique with different total metal loading and tested in the catalytic hydrogenation of CO2 to methanol. The morphological and textural properties of the synthesized catalysts were determined by transmission electron microscopy (TEM), temperature programmed desorption, reduction, oxidation and pulse chemisorption (TPDRO), and N2-adsorption. The CO2 hydrogenation reaction was performed in a microactivity fixed-bed system at 250oC, 2.25 MPa, and H2/CO2 ratio of 3. Experimental results showed that the catalytic structure and performance were strongly affected by the loading of the active site. Where, the catalytic activity, the methanol selectivity as well as the space-time yield increased with increasing the metal loading until it reaches the maximum values at a metal loading of 15 wt% while further addition of metal inhibits the catalytic performance. The higher catalytic activity of 14% and methanol selectivity of 92% was obtained over a Cu/ZnO-SBA-15 catalyst with a total bimetallic loading of 15 wt%. The excellent performance of 15 wt% Cu/ZnO-SBA-15 catalyst is attributed to the presence of well dispersed active sites with small particle size, higher Cu surface area, and lower catalytic reducibility.
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26

Li, Shang Gui, Hai Jun Guo, Hai Rong Zhang, Jun Luo, Lian Xiong, Cai Rong Luo, and Xin De Chen. "The Reverse Water-Gas Shift Reaction and the Synthesis of Mixed Alcohols over K/Cu-Zn Catalyst from CO2 Hydrogenation." Advanced Materials Research 772 (September 2013): 275–80. http://dx.doi.org/10.4028/www.scientific.net/amr.772.275.

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The K/Cu-Zn catalyst has been synthesized by the co-precipitation method coupling with impregnation method and the catalytic performances for the reverse water gas shift (RWGS) reaction and mixed alcohols synthesis from CO2 hydrogenation have been investigated. The catalytic activity and product distribution depend strongly on reaction temperature, pressure, space velocity and the molar ratio of H2/CO2. These results indicated that the optimal conditions for CO2 hydrogenation over K/Cu-Zn catalyst were as follows: 350 K, 6.0 MPa, 5000 h-1 and H2/CO2 = 3.0, under which the selectivity of CO and mixed alcohols reach 84.27 wt% and 7.56 wt%, respectively. The outstanding performances for RWGS reaction and mixed alcohols synthesis of K/Cu-Zn catalyst can be due to the well dispersion of Cu active component.
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27

Gong, Li, Jie-Jie Chen, and Yang Mu. "Catalytic CO2 reduction to valuable chemicals using NiFe-based nanoclusters: a first-principles theoretical evaluation." Phys. Chem. Chem. Phys. 19, no. 41 (2017): 28344–53. http://dx.doi.org/10.1039/c7cp06155b.

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28

Wen, Jinjun, Chunlei Huang, Yuhai Sun, Long Liang, Yudong Zhang, Yujun Zhang, Mingli Fu, Junliang Wu, Limin Chen, and Daiqi Ye. "The Study of Reverse Water Gas Shift Reaction Activity over Different Interfaces: The Design of Cu-Plate ZnO Model Catalysts." Catalysts 10, no. 5 (May 12, 2020): 533. http://dx.doi.org/10.3390/catal10050533.

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CO2 hydrogenation to methanol is one of the main and valuable catalytic reactions applied on Cu/ZnO-based catalysts; the interface formed through Zn migration from ZnO support to the surface of Cu nanoparticle (ZnOx-Cu NP-ZnO) has been reported to account for methanol synthesis from CO2 hydrogenation. However, the accompanied reverse water gas shift (RWGS) reaction significantly decreases methanol selectivity and deactivates catalysts soon. Inhibition of RWGS is thus of great importance to afford high yield of methanol. The clear understanding of the reactivity of RWGS reaction on both the direct contact Cu-ZnO interface and ZnOx-Cu NP-ZnO interface is essential to reveal the low methanol selectivity in CO2 hydrogenation to methanol and look for efficient catalysts for RWGS reaction. Cu doped plate ZnO (ZnO:XCu) model catalysts were prepared through a hydrothermal method to simulate direct contact Cu-ZnO interface and plate ZnO supported 1 wt % Cu (1Cu/ZnO) catalyst was prepared by wet impregnation for comparison in RWGS reaction. Electron paramagnetic resonance (EPR), XRD, SEM, Raman, hydrogen temperature-programmed reduction (H2-TPR) and CO2 temperature-programmed desorption (CO2-TPD) were employed to characterize these catalysts. The characterization results confirmed that Cu incorporated into ZnO lattice and finally formed direct contact Cu-ZnO interface after H2 reduction. The catalytic performance revealed that direct contact Cu-ZnO interface displays inferior RWGS reaction reactivity at reaction temperature lower than 500 °C, compared with the ZnOx-Cu NP-ZnO interface; however, it is more stable at reaction temperature higher than 500 °C, enables ZnO:XCu model catalysts superior catalytic activity to that of 1Cu/ZnO. This finding will facilitate the designing of robust and efficient catalysts for both CO2 hydrogenation to methanol and RWGS reactions.
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29

Oldenhof, S., J. I. van der Vlugt, and J. N. H. Reek. "Hydrogenation of CO2 to formic acid with iridiumIII(bisMETAMORPhos)(hydride): the role of a dormant fac-IrIII(trihydride) and an active trans-IrIII(dihydride) species." Catalysis Science & Technology 6, no. 2 (2016): 404–8. http://dx.doi.org/10.1039/c5cy01476j.

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Catalytic hydrogenation of CO2 to formate with an IrIII(METAMORPhos) complex in the presence of DBU requires a trans-dihydride for catalytic turnover, with an off-cycle trihydride as the dormant species.
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30

Gao, Wen Liang, and Fang Li. "Catalytic Hydrogenation of Nitrate Ions over Pd-Cu/ZSM-5 Catalyst." Advanced Materials Research 197-198 (February 2011): 967–71. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.967.

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Palladium-copper bimetallic catalysts supported over different supporters were prepared by chemical reduction method, and their catalytic performance was investigated with the hydrogenation of nitrate ions in drinking water under mild conditions. The results show that Pd-Cu/ZSM-5 bimetallic catalyst has the highest catalytic activity among all used catalysts. In addition, nitrate conversion influenced by metal content, metal molar ratio (Pd:Cu) and the addition of CO2 are also discussed. It is well established that the addition of CO2 has changed the reduction path of the intermediate nitrite, but is no influence on the steps of nitrate-to-nitrite reduction. In the end, the mechanism of catalytic nitrate reduction was discussed on the basis the literature results.
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31

Srivastava, Vivek. "Hydrotalcite Anchored Ruthenium Catalyst for CO2 Hydrogenation Reaction." Open Chemistry 16, no. 1 (October 22, 2018): 853–63. http://dx.doi.org/10.1515/chem-2018-0094.

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AbstractWe developed a series of new organic-inorganic hybrid hydrotalcite functionalized Ru catalytic systems. All the developed materials have been studied by FTIR, N2 physisorption, ICP-OES, XPS, NMR (1H, 13C, 29Si) and TEM analysis were performed to know the physiochemical behavior and structural morphology of functionalized hydrotalcite materials. XPS results strongly suggest that it involves the formation of N-Ru coordination bonds. We applied these well analyzed materials for CO2 hydrogenation reaction as catalyst (with and without ionic liquid medium). We found that Ru metal containing functionalized hydrotalcite materials were highly active and stable (in terms of catalyst leaching and recycling). The heterogeneous catalyst can be easily recovered and reused 8 times without significant loss of catalytic activity and selectivity, which is a better green alternative for practical applications.
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32

Das, Shubhajit, and Swapan K. Pati. "Mechanistic insights into catalytic CO2 hydrogenation using Mn(i)-complexes with pendant oxygen ligands." Catalysis Science & Technology 8, no. 12 (2018): 3034–43. http://dx.doi.org/10.1039/c8cy00183a.

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33

Tasfy, Sara Faiz Hanna, Noor Asmawati Mohd Zabidi, Maizatul Shima Shaharun, and Duvvuri Subbarao. "Effect of Mn and Pb Promoters on the Performance of Cu/ZnO-Catalyst in CO2 Hydrogenation to Methanol." Applied Mechanics and Materials 625 (September 2014): 289–92. http://dx.doi.org/10.4028/www.scientific.net/amm.625.289.

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The influences of Mn or Pb promoters on the catalytic performance of Cu/ZnO-SBA-15 catalyst in the methanol synthesis from CO2 hydrogenation were studied. The catalytic performances of the prepared catalysts were investigated in a stirred high pressure reactor under conditions of T = 483K, P = 2.25 MPa, and H2:CO2 = 3:1 (volume ratio). The experimental results showed that the promoted catalysts exhibited higher catalytic performance. The Mn promoted catalyst resulted in 36% of CO2 conversion and 67% of methanol selectivity, whereas the unpromoted catalyst showed 26% of CO2 conversion and 58% of methanol selectivity.
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34

Ma, Li Ping, and Wen Juan Xu. "Continuous Catalytic Hydrogenation of Carbon Dioxides on Immobilized Ru Functionalistic Catalysts." Advanced Materials Research 781-784 (September 2013): 227–34. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.227.

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Functionalized catalyst preparation is a new and attractive method for hydrogenation of carbon dioxides. Three kind of carriers were functionalized firstly and then Ru was immobilized on the carriers. Continuous catalytic hydrogenation process was used to evaluate the activity of the catalyst on fixed-bed. It was found that the main production are formic acid and CO at 10MPa, and both the selectivity and recovery of CO are more than 90%, the hydrogen reaction mechanism could be explained with the reversed water gas reaction process. This may offer a new way for the reuse of CO2.
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35

Xue, Zhimin, Weihong Chang, Yan Cheng, Jing Liu, Jian Li, Wancheng Zhao, and Tiancheng Mu. "CO2-in-PEG emulsion-templating synthesis of poly(acrylamide) with controllable porosity and their use as efficient catalyst supports." RSC Advances 6, no. 63 (2016): 58182–87. http://dx.doi.org/10.1039/c6ra04897h.

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36

Bibi, Mehnaz, Rasheed Ullah, Muhammad Sadiq, Saima Sadiq, Idrees Khan, Khalid Saeed, Muhammad Zia, et al. "Catalytic Hydrogenation of Carbon Dioxide over Magnetic Nanoparticles: Modification in Fixed-Bed Reactor." Catalysts 11, no. 5 (May 3, 2021): 592. http://dx.doi.org/10.3390/catal11050592.

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A specific finger-projected fixed-bed reactor (FPFBR) was designed to efficiently utilize magnetic nanoparticles (MnFe2O4/Bi-MnFe2O4) for a model reaction (hydrogenation of a greenhouse gas, CO2, to valuable products: VPs). Coprecipitation method, with desired modification was used for the preparation of magnetic nanoparticles (MNPs) with controlled shape and size. Eighteen fingers in a single chamber were designed in the fixed-bed reactor’s skeleton; each finger worked as an independent reaction core. Controlled flow of hydrogen and CO2 was continuously provided to preheated reaction cores (catalyst beds) from saturator. One of the major products methanol {(%: Conv, 22/Sel 61)} among VPs was identified and quantified by GC. The efficiency of self-designed reactor was 74% for the direct catalytic hydrogenation of CO2 to valuable organic products.
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37

Sung, Molly M. H., Demyan E. Prokopchuk, and Robert H. Morris. "Phosphine-free ruthenium NCN-ligand complexes and their use in catalytic CO2 hydrogenation." Dalton Transactions 48, no. 44 (2019): 16569–77. http://dx.doi.org/10.1039/c9dt03143j.

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38

Scott, Martin, Christian G. Westhues, Teresa Kaiser, Janine C. Baums, Andreas Jupke, Giancarlo Franciò, and Walter Leitner. "Methylformate from CO2: an integrated process combining catalytic hydrogenation and reactive distillation." Green Chemistry 21, no. 23 (2019): 6307–17. http://dx.doi.org/10.1039/c9gc03006a.

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39

Liu, Ming-Han, Hsi-An Chen, Ching-Shiun Chen, Jia-Huang Wu, Hung-Chi Wu, and Chia-Min Yang. "Tiny Ni particles dispersed in platelet SBA-15 materials induce high efficiency for CO2 methanation." Nanoscale 11, no. 43 (2019): 20741–53. http://dx.doi.org/10.1039/c9nr06135e.

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40

Ronchin, Lucio, Claudio Tortato, Alessio Pavanetto, Mattia Miolo, Evgeny Demenev, and Andrea Vavasori. "Formates for green catalytic reductions via CO2 hydrogenation, mediated by magnetically recoverable catalysts." Pure and Applied Chemistry 90, no. 2 (February 23, 2018): 337–51. http://dx.doi.org/10.1515/pac-2017-0704.

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Abstract Precious metal catalyst has been prepared by conventional wet impregnation method followed by precipitation and reduction with hydrogen finally passivated with water in air. The magnetically recoverable catalyst has been prepared starting from a stoichiometric Fe3O4 and ZrO2–Fe3O4 as supports prepared following a sequential precipitation procedure. Precious metal catalysts supported on carbon, alumina, magnetite and zirconia-magnetite nanocomposite has been used in the reduction of nitrobenzenes and acetophenone by using sodium and potassium formate as reducing agent in the presence and in absence of an aqueous phase. In addition, the same catalysts has been tested in CO2 and NaHCO3 hydrogenation, for verifying their potentiality in the CO2 as hydrogen carrier for hydrogenation processes.
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41

He, Zhenhong, Meng Cui, Qingli Qian, Jingjing Zhang, Huizhen Liu, and Buxing Han. "Synthesis of liquid fuel via direct hydrogenation of CO2." Proceedings of the National Academy of Sciences 116, no. 26 (June 10, 2019): 12654–59. http://dx.doi.org/10.1073/pnas.1821231116.

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Synthesis of liquid fuels (C5+hydrocarbons) via CO2hydrogenation is very promising. Hydrogenation of CO2to liquid hydrocarbons usually proceeds through tandem catalysis of reverse water gas shift (RWGS) reaction to produce CO, and subsequent CO hydrogenation to hydrocarbons via Fischer–Tropsch synthesis (FTS). CO2is a thermodynamically stable and chemically inert molecule, and RWGS reaction is endothermic and needs a higher temperature, whereas FTS reaction is exothermic and is thermodynamically favored at a lower temperature. Therefore, the reported technologies have some obvious drawbacks, such as high temperature, low selectivity, and use of complex catalysts. Herein we discovered that a simple Co6/MnOxnanocatalyst could efficiently catalyze CO2hydrogenation. The reaction proceeded at 200 °C, which is much lower than those reported so far. The selectivity of liquid hydrocarbon (C5to C26, mostlyn-paraffin) in total product could reach 53.2 C-mol%, which is among the highest reported to date. Interestingly, CO was hardly detectable during the reaction. The in situ Fourier transform infrared characterization and13CO labeling test confirmed that the reaction was not via CO, accounting for the eminent catalytic results. This report represents significant progress in CO2chemistry and CO2transformation.
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42

Ge, Hao, Yasutaka Kuwahara, Kazuki Kusu, and Hiromi Yamashita. "Plasmon-induced catalytic CO2 hydrogenation by a nano-sheet Pt/HxMoO3−y hybrid with abundant surface oxygen vacancies." Journal of Materials Chemistry A 9, no. 24 (2021): 13898–907. http://dx.doi.org/10.1039/d1ta02277f.

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43

Cheong, Yeon-Joo, Kihyuk Sung, Jin-A. Kim, Yu Kwon Kim, Woojin Yoon, Hoseop Yun, and Hye-Young Jang. "Iridium(NHC)-Catalyzed Sustainable Transfer Hydrogenation of CO2 and Inorganic Carbonates." Catalysts 11, no. 6 (May 31, 2021): 695. http://dx.doi.org/10.3390/catal11060695.

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Iridium(NHC)-catalyzed transfer hydrogenation (TH) of CO2 and inorganic carbonates with glycerol were conducted, demonstrating excellent turnover numbers (TONs) and turnover frequencies (TOFs) for the formation of formate and lactate. Regardless of carbon sources, excellent TOFs of formate were observed (CO2: 10,000 h−1 and K2CO3: 10,150 h−1). Iridium catalysts modified with the triscarbene ligand showed excellent catalytic activity at 200 °C and are a suitable choice for this transformation which requires a high temperature for high TONs of formate. On the basis of the control experiments, the transfer hydrogenation mechanism of CO2 was proposed.
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44

Kumar, N., D. M. Camaioni, M. Dupuis, S. Raugei, and A. M. Appel. "Mechanistic insights into hydride transfer for catalytic hydrogenation of CO2 with cobalt complexes." Dalton Trans. 43, no. 31 (2014): 11803–6. http://dx.doi.org/10.1039/c4dt01551g.

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The catalytic hydrogenation of CO2 to formate by Co(dmpe)2H can proceed via direct hydride transfer or via CO2 coordination to Co followed by reductive elimination of formate.
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45

Liu, Na, Rong Jun Du, and Wei Li. "Hydrogenation CO2 to Formic Acid over Ru Supported on γ-Al2O3 Nanorods." Advanced Materials Research 821-822 (September 2013): 1330–35. http://dx.doi.org/10.4028/www.scientific.net/amr.821-822.1330.

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A series of catalysts made of ruthenium loaded on γ-Al2O3 and γ-Al2O3 nanorods were tested for hydrogenation CO2 to formic acid. Among these catalysts, the catalyst 2% Ru/Al (n) gave the highest activity for hydrogenation CO2 reaction with the yield of formic acid up to 13.6 mmol /h. The excellent catalytic activity is related to the highly dispersed ruthenium species on the surface of support and abundant hydroxyl groups of the support. The dispersion of ruthenium species and the hydroxyl groups of supports were studied by characterization of XRD, nitrogen adsorption measurement, TEM, D2/exchange and H2-TPR in detail. The γ-Al2O3 nanorods lead to the highly dispersed ruthenium species and abundant hydroxyl groups, which appears to be more effective for hydrogenation CO2 to formic acid.
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46

Du, Jie, Yajing Zhang, Kangjun Wang, Fu Ding, Songyan Jia, Guoguo Liu, and Limei Tan. "Investigation on the promotional role of Ga2O3 on the CuO–ZnO/HZSM-5 catalyst for CO2 hydrogenation." RSC Advances 11, no. 24 (2021): 14426–33. http://dx.doi.org/10.1039/d0ra10849a.

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47

Ying, Juntao, Xueqing Han, Lei Ma, Chunshan Lu, Feng Feng, Qunfeng Zhang, and Xiaonian Li. "Effects of Basic Promoters on the Catalytic Performance of Cu/SiO2 in the Hydrogenation of Dimethyl Maleate." Catalysts 9, no. 9 (August 22, 2019): 704. http://dx.doi.org/10.3390/catal9090704.

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Continuous hydrogenation of dimethyl maleate (DMM) toγ-butyrolactone (GBL), 1,4-butanediol (BDO) and tetrahydrofuran (THF) is a promising process in industry. In this study, Cu-M/SiO2 catalysts modified by basic promoters (M = Mg, Ca, Sr, Ba, La) were prepared, and characterized by physical adsorption of N2, in situ XRD, H2-TPR, CO2-TPD. With the addition of basic promoters, the basicity of Cu-M/SiO2 catalysts was improved. The particle size of CuO on Cu-M/SiO2 catalyst was increased after modified by Mg, Ca, Sr, Ba. However, the CuO particle was decreased on the Cu-La/SiO2 catalyst. The series of Cu-M/SiO2 catalyst was applied to the hydrogenation of DMM. The addition of basic promoters increased the selectivity of GBL during the hydrogenation for the basic promoters improved the dehydrogenation of BDO to GBL in alkaline sites. Furthermore, Cu-La/SiO2 presented a higher activity in the hydrogenation of DMM, due to its higher dispersion of Cu.
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48

Fong, Henry, and Jonas C. Peters. "Hydricity of an Fe–H Species and Catalytic CO2 Hydrogenation." Inorganic Chemistry 54, no. 11 (December 31, 2014): 5124–35. http://dx.doi.org/10.1021/ic502508p.

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49

Huff, Chelsea A., and Melanie S. Sanford. "Catalytic CO2 Hydrogenation to Formate by a Ruthenium Pincer Complex." ACS Catalysis 3, no. 10 (September 25, 2013): 2412–16. http://dx.doi.org/10.1021/cs400609u.

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50

Bahmanpour, Ali M., Matteo Signorile, and Oliver Kröcher. "Recent progress in syngas production via catalytic CO2 hydrogenation reaction." Applied Catalysis B: Environmental 295 (October 2021): 120319. http://dx.doi.org/10.1016/j.apcatb.2021.120319.

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