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Journal articles on the topic 'CeO2 TiO2 and CeO2-TiO2 supports'

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Published: 4 June 2021
Last updated: 9 February 2022

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1

Pakrieva, Ekaterina, Ekaterina Kolobova, Dmitrii German, et al. "Glycerol Oxidation over Supported Gold Catalysts: The Combined Effect of Au Particle Size and Basicity of Support." Processes 8, no. 9 (2020): 1016. http://dx.doi.org/10.3390/pr8091016.

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Gold nanoparticles supported on various oxides (CeO2, CeO2/TiO2, MgO, MgO/TiO2, La2O3, La2O3/TiO2) (with 4 wt.% Au loading) were investigated in the liquid (aqueous) phase oxidation of glycerol by molecular oxygen under mild conditions, in the presence of alkaline earth (CaO, SrO and MgO) or alkaline (NaOH) bases. Full conversion and selectivity between 38 and 68% to sodium glycerate were observed on different Au supported catalysts (Au/MgO/TiO2, Au/La2O3/TiO2, Au/CeO2 and Au/CeO2/TiO2). The combined effect of Au particle size and basicity of the support was suggested as the determining factor of the activity. Agglomeration of gold nanoparticles, found after the reaction, led to the deactivation of the catalysts, which prevents the further oxidation of sodium glycerate into sodium tartronate. Promising results were obtained with the use of alkaline earth bases (CaO, SrO, MgO), leading to the formation of free carboxylic acids instead of salts, which are formed in the presence of the more usual base, NaOH.
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2

Xue, Ru Jun, Chun Yang Chen, Shu Fen Cheng, and Min Zhou. "Preparation and Photocatalytic Performance of SO42-/CeO2-TiO2/HTLC." Advanced Materials Research 1073-1076 (December 2014): 3–7. http://dx.doi.org/10.4028/www.scientific.net/amr.1073-1076.3.

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Catalyst precursor was prepared with the Fe-Al hydrotalcite as the support, Ce-doped TiO2 as the active component. Then SO42-/CeO2-TiO2/HTLC photocatalyst was obtained by SO42- -modification with soak method. Catalysts were characterized by means of XRD, SEM-EDS and UV-Vis DRS. With methyl orange as model pollutant, the photocatalytic performance of the catalysts was determined. Experimental results showed that the absorption intensity for visible light of the CeO2-TiO2 particle was stronger than that of TiO2 particle; moreover there was a synergistic effect between SO42- and CeO2-TiO2/HTLC, thus the absorption intensity for visible light of SO42-/CeO2-TiO2/HTLC photocatalyst was enhanced further. The decolorization rate for methyl orange of modified SO42-/15%(CeO2-TiO2)/HTLC photocatalyst reached 93% after irradiation under simulated sunlight for 2 hours.
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3

Xu, Ye, Jin Qiang Ma, Yuan Feng Xu, et al. "CO Oxidation over Pd Catalysts Supported on Different Supports: A Consideration of Oxygen Storage Capacity of Catalyst." Advanced Materials Research 347-353 (October 2011): 3298–301. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.3298.

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A series of Pd catalysts supported on different materials (SiO2, γ-Al2O3, CeO2, TiO2) were synthesized through precipitation reduction of palladium ions with H2. They exhibited different activity during catalytic oxidation of CO to CO2. With the characterization of N2 physisorption experiment, X-ray diffraction, transmission electron microscopy, temperature-programmed reduction, and CO and O2 multi-pulse experiment, the correlation of catalytic activity and oxygen storage capacity (OSC) of catalyst has been investigated. It was found that the reactivity is largely controlled by the OSC of the catalysts, and thus Pd/CeO2 and Pd/TiO2 were more active than Pd/SiO2 and Pd/Al2O3 for CO oxidation.
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4

Ongmali, Duangamol, Sakollapath Pithakratanayothin, Sureerat Jampa, Apanee Luengnaruemitrchai, Thanyalak Chaisuwan, and Sujitra Wongkasemjit. "Remarkable Activity of Nanoarchitectonics Mesoporous CuO/CeO2–TiO2 Prepared by Nanocasting and Deposition Precipitation Techniques." Journal of Nanoscience and Nanotechnology 20, no. 5 (2020): 2791–802. http://dx.doi.org/10.1166/jnn.2020.17428.

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In this work, a ceria (CeO2) support was modified with titania (TiO2) by nanocasting using MCM-48 as a hard template and then loading Cu (as the nitrate salt) at different levels (3–9% by weight) by deposition-precipitation followed by calcination. The addition of TiO2 in MSP CeO2 revealed that the MSP CeO2 was significantly improved the oxygen vacancies of the catalyst by increasing the Ce3+ content from 38 to 75% and stabilizing the Ce3+ species by bonding with the oxygen as Ce(4f)-O(2p)-Ti(3d). Moreover, the bonding of MSP CeO2 with TiO2 generated the oxygen defect vacancies (s–Ti3+), allowing Cu2+ to occupy and be reduced to Cu+ during calcination. The smaller CeO2 crystallite size (2.7 nm) of 9Cu/CeO2–TiO2 increased the mass-specific CO-Oxidation, showing the best catalytic activity due to its highest redox properties, as determined by H2-TPR and also showing resistant property to water and carbon dioxide. Indeed, water was adsorbed on the Ce3+ sites, generating OHads which reacted with CO to form –COOH, resulting in CO2.
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5

Liu, Jie, Xin Yong Li, Qi Dong Zhao, and Dong Ke Zhang. "CuO Supportd Ce-Ti Mixed Oxides for Low-Temperature SCR of NO with Propene." Advanced Materials Research 518-523 (May 2012): 2456–59. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.2456.

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CuO/TiO2, CuO/Ti0.9Ce0.1O2 and CuO/CeO2/TiO2 composite catalysts were prepared and tested for their application in selective catalytic reduction (SCR) of NO with C3H6. The effect of CeO2 species on the catalytic performance was further evaluated. Catalyst characterization including BET surface area, XRD and temperature-programmed reduction of H2 (H2-TPR) suggested that the addition of CeO2 species changed the physicochemical properties of the catalysts obtained. Compared to the impregnation method, the homogeneous precipitation method was an effective approach to preparing the CeO2 doped catalyst, which could promote the activation of C3H6 to react with NO.
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6

Guzmán, C., Gloria Del Angel, Ricardo Gómez, et al. "Gold Particle Size Determination on Au/TiO2-CeO2 Catalysts by Means of Carbon Monoxide, Hydrogen Chemisorption and Transmission Electron Microscopy." Journal of Nano Research 5 (February 2009): 13–23. http://dx.doi.org/10.4028/www.scientific.net/jnanor.5.13.

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Au/TiO2 and Au/TiO2-CeO2 catalysts were prepared by the sol-gel method and carbon monoxide, hydrogen chemisorption and TEM spectroscopy have been exploited to determine the size of gold particles. The gold nanoparticles (8.1 to 2.1 nm) were deposited by using the deposition-precipitation method. The XRD characterization shows the presence of anatase as the TiO2 crystalline phase; while by XPS spectroscopy, the presence of Au°, Au2O3, Ce3+ and Ce4+ species co-existing in the Au/TiO2-CeO2 catalysts is shown. The characterizations by TPD-CO as well as by TPD-H2 (temperature programmed desorption) showed that on catalysts containing cerium, the gold particle size can be determined with great accuracy by using these chemisorption methods. The gold particle size calculated from either the CO or H2 thermodesorption values is in good agreement with that obtained by High Resolution Transmission Electron Microscopy (HRTEM) and Scanning Transmission Electron Microscopy (STEM) analyses. It was proposed that the TPD-CO and/or TPD-H2 techniques could be helpful for the characterization of the gold particles by TEM; especially when the high contrast in the pictures of the supports containing CeO2 prevents the particle size from being determined.
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7

Ma, Jin Qiang, Ye Xu, Yuan Feng Xu, et al. "Aqueous-Phase Reforming of Ethylene Glycol to Hydrogen on Supported Pt Catalysts." Advanced Materials Research 347-353 (October 2011): 2511–14. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.2511.

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Aqueous-phase reforming of 5 wt% ethylene glycol was studied at temperature of 498 K over Pt supported on Al2O3, SiO2, TiO2, CeO2. High selectivity about 90% for generation of hydrogen was observed over the supported Pt catalysts, suggesting that the methanation or the Fischer-Tropsch reactions involving CO/CO2 and H2 does not appear to be important over these catalysts under the present conditions. Compared with Pt/SiO2 and Pt/CeO2, Pt supported on Al2O3 and TiO2 produced measurable amounts of gaseous alkane that may be due to the acidity of the supports. To verify this suppose, the water-gas shift reaction was carried out over the catalysts under the same reaction conditions, and no CH4 was observed over these Pt catalysts. Relatively higher generation rates of hydrogen and carbon dioxide were achieved over Pt/Al2O3 and Pt/SiO2 catalysts.
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8

Mi, Jia, Zi Long Tang, Shao Hua Luo, and Zhong Tai Zhang. "Effect of La2O3 and CeO2 on Nb2O5 Doped TiO2 Ceramic Varistors." Key Engineering Materials 280-283 (February 2007): 301–4. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.301.

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The influence of La2O3 and CeO2 on a new class of polystalline ceramics with electrical properties based on TiO2 was investigated. The content of added La and Ce is in 1 at%, while that of the other addition is always maintained at a constant value. The disks were sintered at 13800C for 4 hours. La2O3 was found to precipitate at the grain boundaries, probably inducing electronic interface states that can trap charges at the TiO2-TiO2 interface and lead to significantly increase the nonlinear behavior. The values for α (» 4.2) and V1mA(» 26 V) support that finding. It was found CeO2 that as a dopant did not strongly influence the nonlinear values of the systems as did La2O3, indicating that it could have formed a solid-state solution with TiO2 in the grains, but did not segregate sufficiently at the grain boundaries. In present work, impedance analyzer, X-ray spectrometer, and scanning electron microscope (SEM) were used.
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9

Procópio, Alley Michael Silva, Jaqueline do Carmo Lima Carvalho, Thales Henrique Resende Silveira, et al. "CeO2 thin film supported on TiO2 porous ceramics." Materials Letters 276 (October 2020): 128224. http://dx.doi.org/10.1016/j.matlet.2020.128224.

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10

Byun, Mi Yeon, Dae-Won Park, and Man Sig Lee. "Effect of Oxide Supports on the Activity of Pd Based Catalysts for Furfural Hydrogenation." Catalysts 10, no. 8 (2020): 837. http://dx.doi.org/10.3390/catal10080837.

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We investigated the effect of oxide supports on the hydrogenation of furfural over Pd catalysts on various supports (Al2O3, SiO2, TiO2, CeO2, and ZrO2). Pd catalysts (5 wt%) prepared by chemical reduction on various supports. The dispersion and uniformity of Pd were affected by the properties of the support and by the nucleation and growth of Pd. The conversion of furfural was enhanced by greater Pd dispersion. The selectivity for cyclopentanone and tetrahydrofurfuryl alcohol was affected by physicochemical properties of Pd catalyst and reaction parameters. High Pd dispersion and high acidity of the catalyst led to greater C=C hydrogenation, thereby, generating more tetrahydrofurfuryl alcohol. The Pd/TiO2 catalyst showed the highest cyclopentanone yield than other catalysts. The Pd/TiO2 catalyst exhibited the >99% furfural conversion, 55.6% cyclopentanone selectivity, and 55.5% cyclopentanone yield under the optimal conditions; 20 bar of H2, at 170 °C for 4 h with 0.1 g of catalyst.
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11

Sadeq Al-Fatesh, Ahmed, Samsudeen Olajide Kasim, Ahmed Aidid Ibrahim та ін. "Combined Magnesia, Ceria and Nickel catalyst supported over γ-Alumina Doped with Titania for Dry Reforming of Methane". Catalysts 9, № 2 (2019): 188. http://dx.doi.org/10.3390/catal9020188.

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This study investigated dry reforming of methane (DRM) over combined catalysts supported on γ-Al2O3 support doped with 3.0 wt. % TiO2. Physicochemical properties of all catalysts were determined by inductively coupled plasma/mass spectrometry (ICP-MS), nitrogen physisorption, X-ray diffraction, temperature programmed reduction/oxidation/desorption/pulse hydrogen chemisorption, thermogravimetric analysis, and scanning electron microscopy. Addition of CeO2 and MgO to Ni strengthened the interaction between the Ni and the support. The catalytic activity results indicate that the addition of CeO2 and MgO to Ni did not reduce carbon deposition, but improved the activity of the catalysts. Temperature programmed oxidation (TPO) revealed the formation of carbon that is mainly amorphous and small amount of graphite. The highest CH4 and CO2 conversion was found for the catalyst composed of 5.0 wt. % NiO-10.0 wt. % CeO2/3.0 wt. %TiO2-γ-Al2O3 (Ti-CAT-II), resulting in H2/CO mole ratio close to unity. The optimum reaction conditions in terms of reactant conversion and H2/CO mole ratio were achieved by varying space velocity and CO2/CH4 mole ratio.
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12

Huang, Li, Qiu, et al. "Effect of Organic Assistant on the Performance of Ceria-Based Catalysts for the Selective Catalytic Reduction of NO with Ammonia." Catalysts 9, no. 4 (2019): 357. http://dx.doi.org/10.3390/catal9040357.

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In the present study, a series of CeO2/TiO2 catalysts were fabricated by dry ball milling method in the absence and presence of organic assistants, and their catalytic performances for the selective catalytic reduction (SCR) of NO by NH3 were investigated. It was found that the addition of organic assistants in the ball milling process and the calcining ambience exerted a significant influence on the catalytic performances of CeO2/TiO2 catalysts. The nitrogen sorption isotherm measurement (BET), powder X-ray diffraction (XRD), Raman spectra, high-resolution transmission electron microscopy (HR-TEM), hydrogen temperature-programmed reduction (H2-TPR), ammonia temperature-programmed desorption (NH3-TPD), sulfur dioxide temperature-programmed desorption (SO2-TPD), thermogravimetric analysis (TG), Fourier transform infrared (FT-IR) and X-ray photoelectron spectra (XPS) characterizations showed that the introduction of citric acid in the ball milling process could significantly change the decomposition process of the precursor mixture, which can lead to improved dispersion and reducibility of cerium species, surface acidity as well as the surface microstructure, all which were responsible for the high low temperature activity of CeTi-C-N in an NH3-SCR reaction. In contrast, the addition of sucrose in the milling process showed an inhibitory effect on the catalytic performance of CeO2/TiO2 catalyst in an NH3-SCR reaction, possibly due to the decrease of the crystallinity of the TiO2 support and the carbon residue covering the active sites.
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13

Nguyen, Thu D., Weiqing Zheng, Fuat E. Celik, and George Tsilomelekis. "CO2-assisted ethane oxidative dehydrogenation over MoOx catalysts supported on reducible CeO2–TiO2." Catalysis Science & Technology 11, no. 17 (2021): 5791–801. http://dx.doi.org/10.1039/d1cy00362c.

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Supported MoOx catalysts on mixed CeO2–TiO2 were investigated for the oxidative dehydrogenation of ethane (ODHE) using CO2 as a mild oxidant. The reducibility of the support and nature of MoOx affect the relative dehydrogenation pathways.
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14

Dauscher, A., P. Wehrer, and L. Hilaire. "Influence of the preparation method on the characteristics of TiO2-CeO2 supports." Catalysis Letters 14, no. 2 (1992): 171–83. http://dx.doi.org/10.1007/bf00765231.

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15

Cortez-Elizalde, Jorge, Ignacio Cuauhtémoc-López, Zenaida Guerra-Que, et al. "Chemical and Structural Changes by Gold Addition Using Recharge Method in NiW/Al2O3-CeO2-TiO2 Nanomaterials." Materials 14, no. 19 (2021): 5470. http://dx.doi.org/10.3390/ma14195470.

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NiWAu trimetallic nanoparticles (NPs) on the surface of support Al2O3-CeO2-TiO2 were synthesized by a three-step synthetic method in which Au NPs were incorporated into presynthesized NiW/Al2O3-CeO2-TiO2. The recharge method, also known as the redox method, was used to add 2.5 wt% gold. The Al2O3-CeO2-TiO2 support was made by a sol–gel method with two different compositions, and then two metals were simultaneously loaded (5 wt% nickel and 2.5 wt% tungsten) by two different methods, incipient wet impregnation and ultrasound impregnation method. In this paper, we study the effect of Au addition using the recharge method on NiW nanomaterials supported on mixed oxides on the physicochemical properties of synthesized nanomaterials. The prepared nanomaterials were characterized by scanning electron microscopy, BET specific surface area, X-ray diffraction, diffuse reflectance spectroscopy in the UV–visible range and temperature-programmed desorption of hydrogen. The experimental results showed that after loading of gold, the dispersion was higher (46% and 50%) with the trimetallic nanomaterials synthesized by incipient wet impregnation plus recharge method than with impregnation plus ultrasound recharge method, indicating a greater number of active trimetallic (NiWAu) sites in these materials. Small-sized Au from NiWAu/ACTU1 trimetallic nanostructures was enlarged for NiWAu/ACT1. The strong metal NPs–support interaction shown for the formation of NiAl2O4, Ni-W-O and Ni-Au-O species simultaneously present in the surface of trimetallic nanomaterial probably plays an important role in the degree of dispersion of the gold active phase.
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16

Yang, Shaoxia, Wanpeng Zhu, and Xingang Wang. "Influence of the structure of TiO2, CeO2, and CeO2-TiO2 supports on the activity of Ru catalysts in the catalytic wet air oxidation of acetic acid." Rare Metals 30, no. 5 (2011): 488–95. http://dx.doi.org/10.1007/s12598-011-0417-z.

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17

Zhang, Hongliang, Long Ding, Hongming Long, et al. "Influence of CeO2 loading on structure and catalytic activity for NH3-SCR over TiO2-supported CeO2." Journal of Rare Earths 38, no. 8 (2020): 883–90. http://dx.doi.org/10.1016/j.jre.2020.01.005.

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18

Kokka, Aliki, Athanasia Petala, and Paraskevi Panagiotopoulou. "Support Effects on the Activity of Ni Catalysts for the Propane Steam Reforming Reaction." Nanomaterials 11, no. 8 (2021): 1948. http://dx.doi.org/10.3390/nano11081948.

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The catalytic performance of supported Ni catalysts for the propane steam reforming reaction was investigated with respect to the nature of the support. It was found that Ni is much more active when supported on ZrO2 or YSZ compared to TiO2, whereas Al2O3− and CeO2-supported catalysts exhibit intermediate performance. The turnover frequency (TOF) of C3H8 conversion increases by more than one order of magnitude in the order Ni/TiO2 < Ni/CeO2 < Ni/Al2O3 < Ni/YSZ < Ni/ZrO2, accompanied by a parallel increase of the selectivity toward the intermediate methane produced. In situ FTIR experiments indicate that CHx species produced via the dissociative adsorption of propane are the key reaction intermediates, with their hydrogenation to CH4 and/or conversion to formates and, eventually, to CO, being favored over the most active Ni/ZrO2 catalyst. Long term stability test showed that Ni/ZrO2 exhibits excellent stability for more than 30 h on stream and thus, it can be considered as a suitable catalyst for the production of H2 via propane steam reforming.
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19

Cheng, Kai, Weiyu Song, Ying Cheng, Jian Liu, Zhen Zhao, and Yuechang Wei. "Selective catalytic reduction over size-tunable rutile TiO2 nanorod microsphere-supported CeO2 catalysts." Catalysis Science & Technology 6, no. 12 (2016): 4478–90. http://dx.doi.org/10.1039/c5cy02121a.

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20

Datye, A. K., D. S. Kalakkad, M. H. Yao, and D. J. Smith. "Comparison of Metal-Support Interactions in Pt/TiO2 and Pt/CeO2." Journal of Catalysis 155, no. 1 (1995): 148–53. http://dx.doi.org/10.1006/jcat.1995.1196.

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21

Liu, Rong, Yi Fan Xu, Fei Ye, Ling Chen Ji, Hao Guan, and Ming Yang. "Low-Temperature Selective Catalytic Reduction with NH3 over MnOx-CeO2 Catalysts Supported on Nano Tetragonal Zirconia." Materials Science Forum 852 (April 2016): 293–99. http://dx.doi.org/10.4028/www.scientific.net/msf.852.293.

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The MnOx-CeO2/t-ZrO2 catalyst was prepared by impregnation with nano t-ZrO2 as the support. The influence of active component and reaction temperature on denitration performance of catalyst was investigated. The results showed that denitration efficiency improved as active component increased and reaction temperature rose. The denitration efficiency of 2.5% MnOx-CeO2/t-ZrO2 at 100°C was 68.1% while 15% MnOx-CeO2/t-ZrO2 was 97.4%. The results of XRD, BET and H2-TPR showed that surface structure of loaded catalyst was good for oxidation-reduction and denigration. NH3-TPD test demonstrated that NH3 was mainly adsorbed at Lewis acid sites on the surface of catalysts and became coordination NH3. Intermediate product NH2NO generated from reactions between coordination NH3 and NO which finally changed into N2 and H2O.NOx are potentially harmful to humans as a kind of primary pollutants. And NOx are the main cause of many environment problems, such as acid rain, surface ozone pollution and Particulate Matter 2.5[1]. The emission of NOx was 2337.8 tons in China in 2011 and that was 2275.4 tons[2]. The environmental situation is grim although the emission of NOx had begun decreasing. Emission standard of air pollutants for thermal power plants which came into effect on January 1, 2012 require the emission concentration of NOx under 100mg·m-3. The task is arduous.Selective catalytic reduction (SCR) of NOx with NH3 is the most promising method to remove NOx and catalysts with high activity play a decisive part in low temperature SCR technology. Many researches about metal oxide as SCR catalyst support have been reported recently, such as TiO2[3], Al2O3[4], activated carbon[5] and molecular sieve[6]. Zirconium oxide has attracted considerable attention recently as a catalyst support because of its special characteristics. Takahashi et al.[7] investigated the influence of the various compositions of TiO2 and ZrO2 on the NOx removal ability over a sulfur-treated NSR catalyst and came to a conclusion that ZrO2 support suppressed the solid phase reaction with potassium. Reddy et al.[8, 9] investigated structural characteristics of nanosized ceria-silica, ceria-titania, and ceria-zirconia mixed oxide catalysts and found these mixed oxides exhibit better redox properties than pure CeO2. YAN Zhi-yong et al.[10] reported that the existence of ZrO2 in catalysts can raise its specific area and enhance the dispersion of CeO2 on catalysts which results in high activity of the catalysts. CeO2/TiO2-ZrO2 catalyst has strong tolerance to water vapor and sulfur dioxide.It is well known that ZrO2 exists mainly in three polymorphs with monoclinic (m-ZrO2), tetragonal (t-ZrO2) and (c-ZrO2) cubic structures[11]. ZrO2 polymorphs have different amphoteric character of its surface hydroxyl groups. The crystalline phase of ZrO2 has a great effect on the structure, activity and selectivity of catalysts. Therefore, it is valuable to investigate the effects of nanocrystalline zirconia polymorphs on catalytic properties of MnOx-CeO2/t-ZrO2 Catalysts which few researchers have concerned about. In this study, we try to investigate catalytic activity and microstructure of SCR catalysts with manganese oxide and cerium oxide supported on t-ZrO2.
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22

Qian, Junning, and Hui Xu. "Insight into optical properties of carbazole-supported on CeO2/TiO2 composite." Materials Research Express 6, no. 11 (2019): 116206. http://dx.doi.org/10.1088/2053-1591/ab47cb.

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23

Dauscher, A., L. Hilaire, F. Le Normand, W. Müller, G. Maire, and A. Vasquez. "Characterization by XPS and XAS of supported Pt/TiO2CeO2 catalysts." Surface and Interface Analysis 16, no. 1-12 (1990): 341–46. http://dx.doi.org/10.1002/sia.740160173.

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24

Cheng, Kai, Jian Liu, Tao Zhang, et al. "Effect of Ce doping of TiO2 support on NH3-SCR activity over V2O5–WO3/CeO2–TiO2 catalyst." Journal of Environmental Sciences 26, no. 10 (2014): 2106–13. http://dx.doi.org/10.1016/j.jes.2014.08.010.

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25

Haiber, Diane M., Kartik Venkatraman, Tu-Uyen Phan, and Peter A. Crozier. "Sensing Interfacial Visible Light Absorption in TiO2-supported CeO2−x Photocatalyst Nanoparticles." Microscopy and Microanalysis 25, S2 (2019): 2084–85. http://dx.doi.org/10.1017/s1431927619011152.

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26

Mitran, Gheorghiţa, Ioan-Cezar Marcu, Adriana Urdă, and Ioan Săndulescu. "Oxidative dehydrogenation of isobutane over supported V-Mo mixed oxides." Journal of the Serbian Chemical Society 75, no. 8 (2010): 1115–24. http://dx.doi.org/10.2298/jsc091204099m.

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Vanadium-molybdenum oxides supported on Al2O3, CeO2 and TiO2 were prepared by a ?wet? impregnation method, characterized using DRX, N2 adsorption, UV-Vis spectroscopy, electrical conductivity measurements and tested in the oxidative dehydrogenation of isobutane. The catalytic performance in the oxidative dehydrogenation of isobutane at 400-550?C depended on the nature of support and on the content of VMoO species on the support. The catalysts supported on alumina were more active and selective than those supported on ceria and titania.
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27

Deng, Changshun, Bin Li, Lihui Dong, et al. "NO reduction by CO over CuO supported on CeO2-doped TiO2: the effect of the amount of a few CeO2." Physical Chemistry Chemical Physics 17, no. 24 (2015): 16092–109. http://dx.doi.org/10.1039/c5cp00745c.

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This work is mainly focused on the investigation of the influence of the amount of a few CeO<sub>2</sub> on the physicochemical and catalytic properties of CeO<sub>2</sub>-doped TiO<sub>2</sub> catalysts for NO reduction by a CO model reaction.
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Li, Chengyang, Hongyi Li, Libo Zhang, Yubo Ma, and Tianfu Wang. "Hydroformylation of Dicyclopentadiene to Monoformyltricyclodecenes over Supported Ultra-Low Content Rh Catalysts." Progress in Reaction Kinetics and Mechanism 43, no. 2 (2018): 166–72. http://dx.doi.org/10.3184/146867818x15233705894356.

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Five types of 0.006 wt% Rh catalyst supported on the surfaces of Al2O3, ZnO, TiO2(rutile), TiO2(anatase) and CeO2 were prepared by the incipient wetness method and used to catalyse the conversion of dicyclopentadiene (DCPD) to monoformyltricyclodecenes (MFTD). The 0.006 wt% Rh/ZnO catalyst showed the highest performance of the catalysts investigated and a 95.5% MFTD yield with 100% MFTD selectivity could be achieved. This suggested that there may be a key role for the carrier on the catalytic performance in the DCPD hydroformylation. Furthermore, the kinetic profiles for DCPD hydroformylation over the 0.006 wt% Rh/ZnO catalyst have been examined systematically to explore the effect of reaction temperature on the catalytic performance. These data collectively suggested that a specific reaction temperature might enhance DCPD hydroformylation, possibly owing to agglomeration of the active sites at higher reaction temperatures.
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29

Wang, Fei, Jianzhun Jiang, and Bin Wang. "Recent In Situ/Operando Spectroscopy Studies of Heterogeneous Catalysis with Reducible Metal Oxides as Supports." Catalysts 9, no. 5 (2019): 477. http://dx.doi.org/10.3390/catal9050477.

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For heterogeneous catalysis, the metal catalysts supported on reducible metal oxides, especially CeO2 and TiO2, have long been a research focus because of their excellent catalytic performance in a variety of catalytic reactions. Detailed understanding of the promotion effect of reducible metal oxides on catalytic reactions is beneficial to the rational design of new catalysts. The important catalytic roles of reducible metal oxides are attributed to their intimate interactions with the supported metals (e.g., strong metal-support interaction, electronic metal-support interaction) and unique support structures (e.g., oxygen vacancy, reversible valence change, surface hydroxyl). However, the structures of the catalysts and reaction mechanisms are strongly affected by environmental conditions. For this reason, in situ/operando spectroscopy studies under working conditions are necessary to obtain accurate information about the structure-activity relationship. In this review, the recent applications of the in situ/operando spectroscopy methodology on metal catalysts with reducible metal oxides as supports are summarized.
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30

Haiber, Diane M., Tu-Uyen Phan, Kartik Venkatraman, and Peter A. Crozier. "Characterization of Mixed Metal Oxide Interfaces Based on TiO2-supported CeO2-x Nanoparticles." Microscopy and Microanalysis 24, S1 (2018): 458–59. http://dx.doi.org/10.1017/s1431927618002787.

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31

Jirátová, K., F. Kovanda, J. Balabánová, et al. "Cobalt oxide catalysts supported on CeO2–TiO2 for ethanol oxidation and N2O decomposition." Reaction Kinetics, Mechanisms and Catalysis 121, no. 1 (2017): 121–39. http://dx.doi.org/10.1007/s11144-017-1142-x.

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32

Zhu, Huaqing, Zhangfeng Qin, Wenjuan Shan, Wenjie Shen, and Jianguo Wang. "CO oxidation at low temperature over Pd supported on CeO2-TiO2 composite oxide." Catalysis Today 126, no. 3-4 (2007): 382–86. http://dx.doi.org/10.1016/j.cattod.2007.06.012.

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33

Shi, Zhisheng, Qingqing Tan, and Dongfang Wu. "Enhanced CO2 hydrogenation to methanol over TiO2 nanotubes-supported CuO-ZnO-CeO2 catalyst." Applied Catalysis A: General 581 (July 2019): 58–66. http://dx.doi.org/10.1016/j.apcata.2019.05.019.

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34

Zeng, Yiqing, Shule Zhang, Yanan Wang, and Qin Zhong. "CeO2 supported on reduced TiO2 for selective catalytic reduction of NO by NH3." Journal of Colloid and Interface Science 496 (June 2017): 487–95. http://dx.doi.org/10.1016/j.jcis.2017.02.050.

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35

Casanova, Marzia, Sara Colussi, and Alessandro Trovarelli. "Investigation of Iron Vanadates for Simultaneous Carbon Soot Abatement and NH3-SCR." Catalysts 8, no. 4 (2018): 130. http://dx.doi.org/10.3390/catal8040130.

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FeVO4 and Fe0.5Er0.5VO4 were prepared and loaded over standard Selective Catalytic Reduction (SCR) supports based on TiO2-WO3-SiO2 (TWS) and redox active supports like CeO2 and CeZrO2 with the aim of finding a suitable formulation for simultaneous soot abatement and NH3-SCR and to understand the level of interaction between the two reactions. A suitable bi-functional material was identified in the composition FeVO4/CeZrO2 where an SCR active component is added over a redox active support, to increase carbon oxidation properties. The influence of the presence of ammonia in soot oxidation and the effect of the presence of soot on SCR reaction have been addressed. It is found that the addition of NO and NO/NH3 mixtures decreases at different levels the oxidation temperature of carbon soot, while the presence of carbon adversely affects the NH3-SCR reaction by increasing the oxidation of NH3 to NO, thus lowering the NO removal efficiency.
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36

Deng, Zhi Peng, Jian Li, Hong He та Lu Di Zhang. "The Activities of NO Oxidation over the Pt/γ-Al2O3 Catalyst". Applied Mechanics and Materials 281 (січень 2013): 385–88. http://dx.doi.org/10.4028/www.scientific.net/amm.281.385.

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Pt catalysts were prepared by incipient wetness impregnation,It was investigated that the effects of the support and the loading of Pt on the activities of NO oxidation over supported Pt catalysts, The investigation indicates that Pt/γ-Al2O3 was better performance than Pt/ZrO2, Pt/CeO2, Pt/TiO2 and Pt/Ce0.4Zr0.6O2 on NO oxidation.The optimal Pt loading over Pt/r-Al2O3 was 1%, the NO conversion efficiency of 54.9% at 300°C, close to the conversion rate of thermodynamic equilibrium of the NO oxidation reaction.
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37

Yao, Ming-Hui. "HREM study of strong-metal interaction in Pt/TiO2." Proceedings, annual meeting, Electron Microscopy Society of America 51 (August 1, 1993): 734–35. http://dx.doi.org/10.1017/s0424820100149507.

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The chemisorption ability and catalytic properties of metal particles supported on reducible oxides are often altered by high temperature reduction(HTR) in a process known as strong metal-support interaction(SMSI). Different models have been proposed to explain the SMSI mechanism. In recent years, experimental evidences have favored the "decoration model", which suggests that SMSI is due to the encapsulation of the metal particles by oxide overlayer species dial have migrated from the support. HREM profile imaging was the most useful tool to directly relate these surface decorations to the SMSI effects. The profile imaging can provide atomic-scale information about supported particles and Uieir surfaces without image being obscured by overlapping contrast from the support.In the present work, the SMSI effect in Pt/TiO2 and Pt/CeO2 model catalysts have been studied using HREM profile imaging and multislice simulations. HREM observations were made with a JEM-4000EX microscope, operated at 400 kV. Fig. 1(a) shows a typical profile image of TiO2 after HTR in H2 at 923K.
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38

Ma, Xiaoyu, Yunlong Ma, Hui Li, and Yingliang Tian. "Deposition of Selective Catalytic Reduction Coating on Wire-Mesh Structure by Atmospheric Plasma Spraying." Materials 12, no. 18 (2019): 3046. http://dx.doi.org/10.3390/ma12183046.

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A series of catalytic coatings consisting of MnOx-CeO2 and TiO2 support were prepared by atmospheric plasma spraying, which was aimed at the application of selective catalytic reduction (SCR) of NOx. The effect of the load of active component on the coating was firstly studied. The results showed that all the coating presented the highest catalytic activity at approximately 350 °C and the coating with the composition of 20MnOx/5CeO2/TiO2 (wt%) achieved the most powerful performance. The coating was then prepared on a wire-mesh structure substrate, which can be easily assembled as a gas filter. The results showed that the specific surface area was greatly increased resulting in the significant improvement of the catalytic activity of the coating. This strategy offered a promising possibility of removing NOx and particulate fliting simultaneously in industrial applications.
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39

García-Hernández, Luis Enrique, Dora Ma Frías-Márquez, J. Gpe Pacheco-Sosa, et al. "2-Chlorophenol degradation by catalytic wet air oxidation using copper supported on TiO2-CeO2-ZrO2." Water Science and Technology 80, no. 5 (2019): 911–19. http://dx.doi.org/10.2166/wst.2019.330.

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Abstract In this work, we describe the morphological, electronic and catalytic properties of support TiO2-CeO2-ZrO2, prepared by sol–gel method, which was impregnated with copper at 5 and 10% by weight, in order to obtain efficient catalysts in the catalytic wet air oxidation (CWAO) of 2-cp. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM-EDS), UV-Vis diffuse reflectance spectroscopy (DRS) and nitrogen physisorption by the Brunauer-Emmett-Teller (BET) method. The activity of the materials used in this study revealed that without the presence of Cu, the SCO2 is low and with a content of 10% this metal shows the best catalytic behaviour; conversely, a reaction mechanism is proposed that describes the complete oxidation of 2-cp in this case.
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40

Song, Wang, Yiqing Zeng, Yanan Wang, et al. "Photo-induced strong active component-support interaction enhancing NOx removal performance of CeO2/TiO2." Applied Surface Science 476 (May 2019): 834–39. http://dx.doi.org/10.1016/j.apsusc.2019.01.190.

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41

Wang, Zhiheng, Mingyang Jiao, Zhipeng Chen, Hong He, and Licheng Liu. "Effects of montmorillonite and anatase TiO2 support on CeO2 catalysts during NH3-SCR reaction." Microporous and Mesoporous Materials 320 (June 2021): 111072. http://dx.doi.org/10.1016/j.micromeso.2021.111072.

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42

González, I. D., R. M. Navarro, W. Wen, et al. "A comparative study of the water gas shift reaction over platinum catalysts supported on CeO2, TiO2 and Ce-modified TiO2." Catalysis Today 149, no. 3-4 (2010): 372–79. http://dx.doi.org/10.1016/j.cattod.2009.07.100.

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43

Dasireddy, Venkata D. B. C., Špela Hajduk, Francisco Ruiz-Zepeda, Janez Kovač, Blaž Likozar, and Zorica Crnjak Orel. "CeO2 and TiO2 support material effects on NH3 decomposition pathway mechanism over Cu–Zn catalysts." Fuel Processing Technology 215 (May 2021): 106752. http://dx.doi.org/10.1016/j.fuproc.2021.106752.

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44

Liu, Shanshan, Hao Wang, Ying Wei, and Runduo Zhang. "Core-shell structure effect on CeO2 and TiO2 supported WO3 for the NH3-SCR process." Molecular Catalysis 485 (April 2020): 110822. http://dx.doi.org/10.1016/j.mcat.2020.110822.

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45

Zhang, Rongbin, Chuanqing Huang, Lijuan Zong, Kun Lu, Xuewen Wang, and Jianxin Cai. "Hydrogen Production from Methanol Steam Reforming over TiO2 and CeO2 Pillared Clay Supported Au Catalysts." Applied Sciences 8, no. 2 (2018): 176. http://dx.doi.org/10.3390/app8020176.

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46

Shutilov, A. A., G. A. Zenkovets, S. V. Tsybulya, V. Yu Gavrilov, and G. N. Kryukova. "Effect of the microstructure of the supported catalysts CuO/TiO2 and CuO/(CeO2-TiO2) on their catalytic properties in carbon monoxide oxidation." Kinetics and Catalysis 53, no. 3 (2012): 409–18. http://dx.doi.org/10.1134/s0023158412030111.

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47

Kosa, Samia A., Naha M. Al-sebaii, Islam H. Abd El Maksod, and Eman Z. Hegazy. "New Method for Removal of Organic Dyes Using Supported Iron Oxide as a Catalyst." Journal of Chemistry 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/1873175.

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In this study, we perform a catalytic decomposition of organic dye over Fe2O3-CeO2-TiO2-γ-Al2O3catalyst in the presence of molecular oxygen and chlorate ions. The results showed that organic dye acts as a sensitizer during this process. The mechanism of the allover process is hypothesized. Several techniques were employed for the characterization of the catalyst, including XRD, SEM, EDAX, and thermal analysis and catalytic activity. The analysis showed that iron is the main active centers, and we have two types of active centers in this process: surface iron and dissolved iron in titanium dioxide. The dissolved iron was found to be the most active center; however, after Fe/Ti = 2.76, a synergism was observed to be occurring between the two active centers.
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48

Gurunathan, Lakshmi, та Velusamy Ponnusamy. "Photocatalytic effect of (TiO2/CeO2) with support of β-cyclodextrin for enhanced performance under solar light". Journal of Materials Science: Materials in Electronics 28, № 24 (2017): 18666–74. http://dx.doi.org/10.1007/s10854-017-7816-3.

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49

Yao, Ming-Hui, David J. Smith, and Abhaya K. Datye. "Observation of supported catalyst particles by high-resolution SEM." Proceedings, annual meeting, Electron Microscopy Society of America 51 (August 1, 1993): 782–83. http://dx.doi.org/10.1017/s042482010014974x.

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Supported metal particle catalysts have found wide application in the chemical industry and for environmental control. Many microscopy techniques have been employed to study these catalysts. Although scanning electron microscopy(SEM) is not commonly used, its ability to provide surface topological information as well as the ease of sample preparation and observation are positive attractions for catalysis research. Due to limited SEM resolution in the past, as well as severe charging of the insulating catalyst supports, very few studies of catalysts using SEM appear to have been reported. Recent development of in-lens specimen immersion systems and cold field emission sources of high brightness have made it possible to image specimen surfaces with secondary electrons at subnanometer resolution. Using a high resolution Hitachi S-5000 in-lens field emission SEM, we have studied Pt particles supported on TiO2 and CeO2. The purpose of this study was to evaluate relative merits and demerits of high resolution SEM for catalysis research, in particular with respect to TEM and STEM techniques.
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50

Kim, Min-Sung, Dae-Won Lee, Sang-Ho Chung, Ji Tae Kim, Il-Hyoung Cho, and Kwan-Young Lee. "Pd–Cu bimetallic catalysts supported on TiO2–CeO2 mixed oxides for aqueous nitrate reduction by hydrogen." Journal of Molecular Catalysis A: Chemical 392 (October 2014): 308–14. http://dx.doi.org/10.1016/j.molcata.2014.05.034.

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