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Journal articles on the topic 'Catalyseur solide acide'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Carà, Piera Demma, Mario Pagliaro, Ahmed Elmekawy, et al. "Hemicellulose hydrolysis catalysed by solid acids." Catalysis Science & Technology 3, no. 8 (2013): 2057. http://dx.doi.org/10.1039/c3cy20838a.

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2

Jahangiri, Hessam, Amin Osatiashtiani, Miloud Ouadi, Andreas Hornung, Adam F. Lee, and Karen Wilson. "Ga/HZSM-5 Catalysed Acetic Acid Ketonisation for Upgrading of Biomass Pyrolysis Vapours." Catalysts 9, no. 10 (2019): 841. http://dx.doi.org/10.3390/catal9100841.

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Pyrolysis bio-oils contain significant amounts of carboxylic acids which limit their utility as biofuels. Ketonisation of carboxylic acids within biomass pyrolysis vapours is a potential route to upgrade the energy content and stability of the resulting bio-oil condensate, but requires active, selective and coke-resistant solid acid catalysts. Here we explore the vapour phase ketonisation of acetic acid over Ga-doped HZSM-5. Weak Lewis acid sites were identified as the active species responsible for acetic acid ketonisation to acetone at 350 °C and 400 °C. Turnover frequencies were proportiona

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3

Osatiashtiani, Amin, Lee J. Durndell, Jinesh C. Manayil, Adam F. Lee, and Karen Wilson. "Influence of alkyl chain length on sulfated zirconia catalysed batch and continuous esterification of carboxylic acids by light alcohols." Green Chemistry 18, no. 20 (2016): 5529–35. http://dx.doi.org/10.1039/c6gc01089j.

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4

Potter, Matthew E., Lindsay-Marie Armstrong, and Robert Raja. "Combining catalysis and computational fluid dynamics towards improved process design for ethanol dehydration." Catalysis Science & Technology 8, no. 23 (2018): 6163–72. http://dx.doi.org/10.1039/c8cy01564c.

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5

Potter, Matthew E., Danni Sun, and Robert Raja. "The curious effects of integrating bimetallic active centres within nanoporous architectures for acid-catalysed transformations." Catalysis Science & Technology 6, no. 8 (2016): 2616–22. http://dx.doi.org/10.1039/c5cy02061a.

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6

Rodenas, Y., R. Mariscal, J. L. G. Fierro, D. Martín Alonso, J. A. Dumesic та M. López Granados. "Improving the production of maleic acid from biomass: TS-1 catalysed aqueous phase oxidation of furfural in the presence of γ-valerolactone". Green Chemistry 20, № 12 (2018): 2845–56. http://dx.doi.org/10.1039/c8gc00857d.

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7

Bruno, Sofia M., Ana C. Gomes, Tânia S. M. Oliveira, et al. "Catalytic alcoholysis of epoxides using metal-free cucurbituril-based solids." Organic & Biomolecular Chemistry 14, no. 16 (2016): 3873–77. http://dx.doi.org/10.1039/c6ob00512h.

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8

Reche, Mariano Tapia, Amin Osatiashtiani, Lee J. Durndell, et al. "Niobic acid nanoparticle catalysts for the aqueous phase transformation of glucose and fructose to 5-hydroxymethylfurfural." Catalysis Science & Technology 6, no. 19 (2016): 7334–41. http://dx.doi.org/10.1039/c6cy01129b.

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The first catalytic application of a nanoparticulate niobia solid acid prepared from a high area peroxo niobic acid sol, and its SBA-15 supported analogue, is demonstrated for the heterogeneously catalysed aqueous phase conversion of glucose and fructose to 5-HMF.

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9

Kumar, Suresh, and Jagdish K. Makrandi. "A Facile Solvent Free Synthesis of 3-arylidenechroman-4-ones Using Grinding Technique." E-Journal of Chemistry 9, no. 3 (2012): 1251–56. http://dx.doi.org/10.1155/2012/324907.

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An efficient method for the synthesis of 3-arylidenechroman-4-ones has been developed under solvent free conditions using grinding technique. Grinding of variously substituted chroman-4-ones with aromatic aldehydes in presence of anhydrous barium hydroxide at room temperature give 3-arylidenechroman-4-ones in high yield (75-92%). Products are obtained by just acidification of the reaction mixture in ice cold water. Reaction in solid state, with enhanced rate, high selectivity and manipulative simplicity are the attractive features of this environmentally benign protocol. The chroman-4-one deri

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10

Hurst, G., I. Brangeli, M. Peeters, and S. Tedesco. "Solid residue and by-product yields from acid-catalysed conversion of poplar wood to levulinic acid." Chemical Papers 74, no. 5 (2019): 1647–61. http://dx.doi.org/10.1007/s11696-019-01013-3.

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AbstractThis study examines the yields of solid residue and by-product from the microwave-assisted acid hydrolysis of lignocellulosic poplar wood for levulinic acid production. The aim of this study was to optimise levulinic acid production via response surface methodology (RSM) and also investigate the effect of reaction conditions on other products such as furfural, solid residue, formic acid and acetic acid yields. A maximum theoretical levulinic acid yield of 62.1% (21.0 wt %) was predicted when reaction conditions were 188 °C, 126 min and 1.93 M sulphuric acid, with a corresponding solid

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11

Abdel-Latif, Ehab, Gerd Kaupp, and Mohamed A. Metwally. "Brand New Quantitative Solid-state Synthesis of N-pyrazolyl Azomethines." Journal of Chemical Research 2005, no. 3 (2005): 187–89. http://dx.doi.org/10.3184/0308234054213735.

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Fifteen preparatively useful azomethines 3 and 5 have been quantitatively (100% yield at 100% conversion) obtained as hydrates by ball-milling together 4-aminoantipyrine 1 and 3-amino-4,6-dimethylpyrazolopyridine 4 with solid benzaldehydes 2 without passing through liquid phases. Unlike (acid catalysed) azomethine syntheses in solution, the solid–solid condensations proceed “waste free” in the absence of any auxiliaries or microwave irradiation. The product yields are quantitative in all cases and the products do not require purifying workup.

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12

Khosravi, Kaveh, Mojgan Zendehdel, Shirin Naserifar, Fatemeh Tavakoli, Kobra Khalaji, and Atefeh Asgari. "Heteropoly acid/NaY zeolite as a reusable solid catalyst for highly efficient synthesis of gem-dihydroperoxides and 1,2,4,5-tetraoxanes." Journal of Chemical Research 40, no. 12 (2016): 744–49. http://dx.doi.org/10.3184/174751916x14792244600532.

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gem-Dihydroperoxides and 1,2,4,5-tetraoxanes were synthesised from aldehydes and ketones catalysed by heteropoly acid/NaY zeolite (HPA/NaY) as a new, effective and reusable solid catalyst using 30% aqueous hydrogen peroxide at room temperature. The reactions proceeded with high rates and excellent yields.

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13

Wali, Anil, and S. Muthukumaru Pillai. "Cyclodehydration of Some 1,n-Diols Catalysed by Sulfated Zirconia." Journal of Chemical Research 23, no. 5 (1999): 326–27. http://dx.doi.org/10.1177/174751989902300515.

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14

Gowri Krishnan, Shamala, Fei Ling Pua, Kumaran Palanisamy, and Sharifah Nabihah. "Preparation of Oil Palm EFB Derived Solid Acid Catalyst for Esterification Reaction: Effect of Calcination Temperature." Key Engineering Materials 701 (July 2016): 117–21. http://dx.doi.org/10.4028/www.scientific.net/kem.701.117.

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Oil palm empty fruit bunch (EFB) is one of the palm biomass produced in abundance after oil extraction in Malaysia. This study was focused to utilize this waste biomass as a beneficial raw materials. EFB was used to prepare new solid acid catalyst for biodiesel production. EFB was converted into solid catalyst via direct impregnation method and it was used to catalyse esterification of oleic acid. Transition metal sulfide salt, Fe2(SO4)3 was impregnated on EFB fibres. Effect of different calcination temperature was studied on the properties of catalyst. The result shows that Fe2(SO4)3 based so

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15

Zhang, Yu Li, Xiang Ying Hao, Cui Zhang, and De Yun Ma. "Application of SO₄^2-/ Al-Fe-Activated Solid Acid Catalyst Prepared by Cross-Linking Method." Applied Mechanics and Materials 448-453 (October 2013): 2929–32. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2929.

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SO42-/ Al-Fe-activated solid acid catalyst has been prepared using cross-linking method, and characterized by FTIR spectra, TG-DTA, XRD analysis. The catalyst is able to effectively catalyse the hydration of turpentine to α-terpineol, with the conversion up to 40% after > 4 uses.

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16

Bondock, Samir, Ehab Abdel Latif та Johann Lex. "Solvent-free Photooxygenation of 5-methoxyoxazoles: Stereoselective Synthesis of α-amino-α-hydroxy Carboxylic Acid Derivatives". Journal of Chemical Research 2005, № 7 (2005): 422–26. http://dx.doi.org/10.3184/030823405774309168.

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A solvent-free photooxygenation of 5-methoxyoxazoles 1a–j embedded in porphrin-loaded polystyrene beads as solid support is described and applied for the synthesis of 3H-1,2,4-dioxazole derivatives 2a–j. Acid catalysed hydrolysis of 3H-1,2,4-dioxazole derivatives gave α-amino-α-hydroxy carboxylic acid derivatives 3a–j. The structural elucidation of the new compounds were carried on the basis of spectral and X-ray analyses.

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17

Grigg, Ronald, Jeremy P. Major, Fionna M. Martin, and Mark Whittaker. "Solution and solid-phase synthesis of hydroxamic acids via palladium catalysed cascade reactions." Tetrahedron Letters 40, no. 43 (1999): 7709–11. http://dx.doi.org/10.1016/s0040-4039(99)01574-9.

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18

Chuah, G. K., S. H. Liu, S. Jaenicke, and L. J. Harrison. "Cyclisation of Citronellal to Isopulegol Catalysed by Hydrous Zirconia and Other Solid Acids." Journal of Catalysis 200, no. 2 (2001): 352–59. http://dx.doi.org/10.1006/jcat.2001.3208.

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19

Jeeru, Lakshmana Rao, V. Saikumar Reddy R., Sayantan Pradhan, Gautam Kundu, and Narayan C. Pradhan. "Kinetics of solid acids catalysed nitration of toluene: Change in selectivity by triphase (liquid-liquid-solid) catalysis." Asia-Pacific Journal of Chemical Engineering 13, no. 1 (2017): e2158. http://dx.doi.org/10.1002/apj.2158.

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20

Nascimento, Ana C., Carla S. R. Tecelão, José H. Gusmão, M. Manuela R. da Fonseca, and Suzana Ferreira-Dias. "Modelling lipase-catalysed transesterification of fats containingn-3 fatty acids monitored by their solid fat content." European Journal of Lipid Science and Technology 106, no. 9 (2004): 599–612. http://dx.doi.org/10.1002/ejlt.200401000.

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21

Choudary, Boyapati M., N. Sreenivasa Chowdari, and M. Lakshmi Kantam. "Friedel–Crafts sulfonylation of aromatics catalysed by solid acids: An eco-friendly route for sulfone synthesis." Journal of the Chemical Society, Perkin Transactions 1, no. 16 (2000): 2689–93. http://dx.doi.org/10.1039/b002931i.

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22

Hino, Makoto, and Kazushi Arata. "Acylation of toluene with acetic and benzoic acids catalysed by a solid superacid in a heterogeneous system." Journal of the Chemical Society, Chemical Communications, no. 3 (1985): 112. http://dx.doi.org/10.1039/c39850000112.

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23

Tanaka, Kan, Akira Miyazawa, Ai Hiate, et al. "An Acid Catalysed Intramolecular C–C Coupling Reaction of 8-halomethyl-16-methoxy[2.2]Metacyclophanes." Journal of Chemical Research 2005, no. 8 (2005): 495–97. http://dx.doi.org/10.3184/030823405774663228.

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The hydrolysis of 8-bromomethyl[2.2]metacyclophane 1a with a methoxy group at the 16-position was carried out in an 80% aqueous dioxane solution by refluxing in the presence of Nafion-H (a solid perfluorinated resin sulfonic acid) as a catalyst. The reaction yielded the corresponding 8-hydroxymethyl[2.2]metacyclophane 3 and the intramolecular C–C coupling product 2 with a spiro skeleton.

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24

Li, Tong-Shuang, Jian-Xin Wang, and Xue-Jing Zheng. "Simple synthesis of allobetulin, 28-oxyallobetulin and related biomarkers from betulin and betulinic acid catalysed by solid acids." Journal of the Chemical Society, Perkin Transactions 1, no. 23 (1998): 3957–66. http://dx.doi.org/10.1039/a806735j.

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25

Lima, Sérgio, Martyn Pillinger, and Anabela A. Valente. "Dehydration of d-xylose into furfural catalysed by solid acids derived from the layered zeolite Nu-6(1)." Catalysis Communications 9, no. 11-12 (2008): 2144–48. http://dx.doi.org/10.1016/j.catcom.2008.04.016.

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26

Mackay, Maureen F., Douglas J. Gale, and John F. K. Wilshire. "Structural studies of some 1-polymethyleneimino-2,4-dinitrobenzenesand related compounds; crystal structure of 1-(cis-2′,6′-dimethylpiperidin-1′-yl)-2,4-dinitrobenzene." Australian Journal of Chemistry 53, no. 8 (2000): 715. http://dx.doi.org/10.1071/ch00076.

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The ultraviolet and 1H n.m.r. spectra of some 1-polymethyleneimino-2,4-dinitrobenzenes and related compounds are discussed. The effect of trifluoroacetic acid on these spectra was also investigated; with 1-azetidinyl-2,4-dinitrobenzene, acid-catalysed ring opening was observed. The solid-state conformation of 1-(cis-2′,6′-dimethylpiperidin-1′-yl)-2,4-dinitrobenzene has been defined by single-crystal X-ray crystallography. Triclinic crystals belong to the space group P–1 with a 8.165(1), b 7.865(1), c 11.148(1) Å, α 95.23(1), β 106.00(1), γ 92.63(1)˚ and Z 2. The structure was refined to a fina

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27

Stobiecki, Maciej, Maciej Buśko, Łukasz Marczak, Paweł Bednarek, Mariola Piślewska, and Przemysław Wojtaszek. "The complexity of oxidative cross-linking of phenylpropanoids — evidence from an in vitro model system." Functional Plant Biology 29, no. 7 (2002): 853. http://dx.doi.org/10.1071/pp01233.

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The development of an in vitro model system to study the process of dimerization of hydroxycinnamic acids is reported. Model compounds ferulic acid (FA) or methyl ferulate were reacted with H2O2 in the presence of horseradish peroxidase (HRP) or peroxidases from Lupinus albus L. apoplastic fluids. Following solid-phase extraction, the reaction products were analysed using gas chromatography-mass spectrometry. Major analytical and biochemical parameters of model reactions were determined and optimized. Six ferulic dimers were identified and quantified. With the use of this model system we found

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28

Wijayati, Nanik, Harno Dwi Pranowo, Jumina Jumina та Triyono Triyono. "SYNTHESIS OF TERPINEOL FROM α-PINENE CATALYZED BY TCA/Y-ZEOLITE". Indonesian Journal of Chemistry 11, № 3 (2011): 234–37. http://dx.doi.org/10.22146/ijc.21386.

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The hydration of a-pinene has been studied in the presence of TCA/Y-Zeolite catalyse. The catalyst was prepared by impregnating trichloroacetic acid (TCA) on support of Y-Zeolite. The TCA/Y-Zeolite catalyst converted a-pinene into hydrocarbons, while the TCA/Y-Zeolite catalyst was active and selective for producing alcohols, with a conversion of 66% and showed 55% selectivity for α-terpineol at 10 min. The reaction taken place in a solid-liquid mode and most of the α-terpineol is extracted out by the organic phase during the course of the reaction. TCA/Y-Zeolite was found as good catalyst for

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29

Kumar, Dinesh, Damodara N. Kommi, Rajesh Chebolu, Sanjeev K. Garg, Raj Kumar, and Asit K. Chakraborti. "Selectivity control during the solid supported protic acids catalysed synthesis of 1,2-disubstituted benzimidazoles and mechanistic insight to rationalize selectivity." RSC Adv. 3, no. 1 (2013): 91–98. http://dx.doi.org/10.1039/c2ra21994h.

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30

Gianotti, Enrica, Maela Manzoli, Matthew E. Potter, et al. "Rationalising the role of solid-acid sites in the design of versatile single-site heterogeneous catalysts for targeted acid-catalysed transformations." Chem. Sci. 5, no. 5 (2014): 1810–19. http://dx.doi.org/10.1039/c3sc53088d.

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31

Li, Tong-Shuang, Hui-Yun Duan, Bao-Zhi Li, Brij B. Tewari, and Sheng-Hui Li. "Novel oxidative coupling of 2-naphthols to 1,1′-bi-2-naphthols catalysed by solid Lewis acids using atmospheric oxygen as oxidant." Journal of the Chemical Society, Perkin Transactions 1, no. 3 (1999): 291–94. http://dx.doi.org/10.1039/a808656g.

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32

Yadav, Ganapati D., and Ketan P. Pimparkar. "Insight into Friedel-Crafts acylation of 1,4-dimethoxybenzene to 2,5-dimethoxyacetophenone catalysed by solid acids—mechanism, kinetics and remedies for deactivation." Journal of Molecular Catalysis A: Chemical 264, no. 1-2 (2007): 179–91. http://dx.doi.org/10.1016/j.molcata.2006.07.075.

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33

Evtuguin, D. V., C. Pascoal Neto, and J. Rocha. "Lignin Degradation in Oxygen Delignification Catalysed by [PMo7V5O40]8- Polyanion. Part I. Study on Wood Lignin." Holzforschung 54, no. 4 (2000): 381–89. http://dx.doi.org/10.1515/hf.2000.065.

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Summary The behaviour of lignin in wood delignification by oxygen in acidic media in the presence of the molybdovanadophosphate heteropolyanion [PMO7V5O40]8−as studied using wet chemistry methods, solid and liquid state 13C NMR spectroscopy. Lignin is oxidised by [PMO7V5O40]8− almost completely to carbon dioxide, with a minor yield of intermediate low-molecular weight aromatic products. The analysis of the reaction products shows that the lignin acidolysis and homolysis involving the oxygen participation in oxidation take place. The residual lignin in the wood residue is more “condensed” and r

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34

Hamer, P. D., D. E. Shallcross, A. Yabushita, M. Kawasaki, V. Marécal, and C. S. Boxe. "Investigating the photo-oxidative and heterogeneous chemical production of HCHO in the snowpack at the South Pole, Antarctica." Environmental Chemistry 11, no. 4 (2014): 459. http://dx.doi.org/10.1071/en13227.

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Environmental context Snowpacks present a surprisingly active environment for photochemistry, leading to sunlight-induced oxidation of deposited organic matter and the subsequent emission of a variety of photochemically active trace gases. We seek to address questions regarding the ultimate fate of organic matter deposited onto snow in the remote regions of the world. The work is relevant to atmospheric composition and climate change. Abstract We investigate snowpack fluxes of formaldehyde (HCHO) into the South Pole boundary layer using steady-state photochemical models. We study two chemical

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Štoček, Jakub Radek, and Martin Dračínský. "Tautomerism of Guanine Analogues." Biomolecules 10, no. 2 (2020): 170. http://dx.doi.org/10.3390/biom10020170.

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Tautomerism of nucleic acid (NA) bases is a crucial factor for the maintenance and translation of genetic information in organisms. Only canonical tautomers of NA bases can form hydrogen-bonded complexes with their natural counterparts. On the other hand, rare tautomers of nucleobases have been proposed to be involved in processes catalysed by NA enzymes. Isocytosine, which can be considered as a structural fragment of guanine, is known to have two stable tautomers both in solution and solid states. The tautomer equilibrium of isocytosine contrasts with the remarkable stability of the canonica

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36

Tian, Jia, Hui Wang, Dan-Wei Zhang, Yi Liu, and Zhan-Ting Li. "Supramolecular organic frameworks (SOFs): homogeneous regular 2D and 3D pores in water." National Science Review 4, no. 3 (2017): 426–36. http://dx.doi.org/10.1093/nsr/nwx030.

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Abstract Studies on periodic porosity and related properties and functions have been limited to insoluble solid-state materials. Self-assembly provides a straightforward and efficient strategy for the construction of soluble periodic porous supramolecular organic frameworks (SOFs) in water from rationally designed molecular building blocks. From rigid tri- and tetra-armed building blocks and cucurbitu[8]ril (CB[8]), a number of two-dimensional (2D) honeycomb, square and rhombic SOFs can be generated, which is driven by CB[8]-encapsulation-enhanced dimerization of two aromatic units on the peri

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37

Mathews, Helena, C. Cohen, W. Wagoner, J. Kellogg, V. Dewey, and R. Bestwick. "180 GENETIC TRANSFORMATION OF RED RASPBERRY (RUBUS IDAEUS L.) WITH A GENE TO CONTROL ETHYLENE BIOSYNTHESIS." HortScience 29, no. 5 (1994): 454f—454. http://dx.doi.org/10.21273/hortsci.29.5.454f.

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We have developed efficient plant rageneration and transformation systems for red raspberry (Rubus idaeus L.). We have successfully introduced a gene for controlling biosynthesis of ethylene into raspberry for the first time. Leaf and petiole segments were co-cultivated with disarmed Agrobacterium strains EHA 101 or 105 containing plasmids pAG5420, pAG 1452 or pAG1552. The plasmids encoded gene sequences for S-adenosylmethionine hydrolase (SAM ase) driven by the fruit specific or wound and fruit specific tomato SE8 or E4 promoters. SAM ase catalyses the conversion of S-adenosylmethionine (SAM)

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Kamwilaisak, Khanita, and Mallika Thabuot. "The Fixed Bed Reaction of Residual Natural Rubber for Oil Production by Pyrolysis Process." Advanced Materials Research 931-932 (May 2014): 225–30. http://dx.doi.org/10.4028/www.scientific.net/amr.931-932.225.

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The aim of this study is to use pyrolysis reaction to produce oil product as a fuel or chemical feedstock. The fixed bed reactor was used as a pyrolysis system. The pyrolysis reaction of residual para rubber was operated in the absence of catalyse. The operating conditions such as particle size (0.5 and 1.0 cm3) and pyrolysis temperature (500, 550 and 600 OC) were studied under N2 conditions and retention time 90 min. The result shows the para rubber size 1.0 cm3 can be produced liquid phase more than of para rubber size of 0.5 cm3. The optimised condition with the highest oil yield was at 550

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Candy, Rachel M., Kyle R. Blight, and David E. Ralph. "Analysis of the Bacterial Sulphur System." Advanced Materials Research 825 (October 2013): 190–93. http://dx.doi.org/10.4028/www.scientific.net/amr.825.190.

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Heterogeneous bacterial sulphur systems are inherently complicated. However, developing an understanding of the influence of environmental factors such as pH,Iand PCO2is important for a number of fields. Examples of these include minimising acid mine drainage and maximising metal recovery from low-grade sulphide minerals. Measuring the effect of these factors on the extent and rate of sulphur (S) oxidation is complicated by the presence and nature of solid phase elemental S. The rate and extent of S oxidation can be determined indirectly via the reaction product, H2SO4, which was quantified us

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40

Roldin, P., A. C. Eriksson, E. Z. Nordin, et al. "Modelling non-equilibrium secondary organic aerosol formation and evaporation with the aerosol dynamics, gas- and particle-phase chemistry kinetic multi-layer model ADCHAM." Atmospheric Chemistry and Physics Discussions 14, no. 1 (2014): 769–869. http://dx.doi.org/10.5194/acpd-14-769-2014.

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Abstract. We have developed the novel Aerosol Dynamics, gas- and particle-phase chemistry model for laboratory CHAMber studies (ADCHAM). The model combines the detailed gas phase Master Chemical Mechanism version 3.2, an aerosol dynamics and particle phase chemistry module (which considers acid catalysed oligomerization, heterogeneous oxidation reactions in the particle phase and non-ideal interactions between organic compounds, water and inorganic ions) and a kinetic multilayer module for diffusion limited transport of compounds between the gas phase, particle surface and particle bulk phase.

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Roldin, P., A. C. Eriksson, E. Z. Nordin, et al. "Modelling non-equilibrium secondary organic aerosol formation and evaporation with the aerosol dynamics, gas- and particle-phase chemistry kinetic multilayer model ADCHAM." Atmospheric Chemistry and Physics 14, no. 15 (2014): 7953–93. http://dx.doi.org/10.5194/acp-14-7953-2014.

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Abstract. We have developed the novel Aerosol Dynamics, gas- and particle-phase chemistry model for laboratory CHAMber studies (ADCHAM). The model combines the detailed gas-phase Master Chemical Mechanism version 3.2 (MCMv3.2), an aerosol dynamics and particle-phase chemistry module (which considers acid-catalysed oligomerization, heterogeneous oxidation reactions in the particle phase and non-ideal interactions between organic compounds, water and inorganic ions) and a kinetic multilayer module for diffusion-limited transport of compounds between the gas phase, particle surface and particle b

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42

Maru, Minaxi S., Parth Patel, Noor-ul H. Khan, and Ram S. Shukla. "Copper Hydrotalcite (Cu-HT) as an Efficient Catalyst for the Hydrogenation of CO2 to Formic Acid." Current Catalysis 9, no. 1 (2020): 59–71. http://dx.doi.org/10.2174/2211544709999200413110411.

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: Hydrogenation of CO2 to energy-rich products over heterogeneous metal catalysts has gained much attention due to their commercial applications. Specifically, the first-row transition metal catalysts are very rarely reported and discussed for the production of formic acid from the hydrogenation of CO2. Herein, hydrotalcite supported copper metal has shown activity and efficiency to produce formic acid from the hydrogenation of CO2, without adding any additional base or promoter and was effectively recycled 4 times after separating by simple filtration without compromising the formic acid yiel

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DEGUCHI, Hiroshi, Hiroyuki TAKEYA, Esteban C. GABAZZA, Junji NISHIOKA, and Koji SUZUKI. "Prothrombin kringle 1 domain interacts with factor Va during the assembly of prothrombinase complex." Biochemical Journal 321, no. 3 (1997): 729–35. http://dx.doi.org/10.1042/bj3210729.

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The kringle 2 domain of prothrombin has been shown to interact with factor Va during the activation of prothrombin by the prothrombinase complex composed of factor Xa, factor Va, negatively charged phospholipids and Ca2+ ions. However, contradictory results have been reported about the role of the kringle 1 domain of prothrombin during the assembly of the prothrombinase complex. In an attempt to clarify the role of the kringle 1 domain of prothrombin, its effect on the activation of prothrombin by the prothrombinase complex and its direct binding to human factor Va were assessed. Comparative e

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Aschmann, Sara M., Janet Arey, and Roger Atkinson. "Reaction of OH radicals with 5-hydroxy-2-pentanone: formation yield of 4-oxopentanal and its OH radical reaction rate constant." Environmental Chemistry 10, no. 3 (2013): 145. http://dx.doi.org/10.1071/en12146.

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Environmental context Alkanes, major constituents of vehicle exhausts, are emitted to the atmosphere where they react, chiefly by gas-phase reactions with the hydroxyl radical, to form products which can also react further. In laboratory experiments, we studied the further reactions of a model first-generation alkane reaction product. Understanding alkane reaction chains is important because the toxicity, secondary aerosol formation and other properties of vehicle emissions can change as new compounds are formed. Abstract 1,4-Hydroxycarbonyls are major products of the gas-phase reactions of al

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Henderson, P. J. F., C. K. Hoyle, and A. Ward. "Expression, purification and properties of multidrug efflux proteins." Biochemical Society Transactions 28, no. 4 (2000): 513–17. http://dx.doi.org/10.1042/bst0280513.

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A general strategy is described for the amplified expression, purification and characterization in Escherichia coli of multidrug efflux proteins from Staphylococcus aureus, Bacillus subtilis, Methanococcus janaschii and E. coli. They all catalyse drug/H+ antiport of substrates such as quinolones and ethidium and exemplify a family of putatively 12-helix membrane proteins. The gene for each protein was cloned downstream of the tac promoter in plasmid pTTQ18; an oligonucleotide encoding six histidine residues was added, in frame, to the C-terminus to facilitate purification. Growth conditions we

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"Influence of Catalyst Preparation Conditions on Coconut Shell-derived Solid Acid Catalyst Performance for Transesterification." International Journal of Recent Technology and Engineering 8, no. 2S3 (2019): 270–77. http://dx.doi.org/10.35940/ijrte.b1047.0782s319.

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The carbon-based solid acid catalyst is mostly synthesized through a series of incomplete carbonization and sulfonation process. This paper investigates the influence of catalyst preparation conditions on the catalyst performance in biodiesel conversion. Coconut-shell-derived solid acid catalyst was prepared through incomplete carbonization followed by sulfonation using concentrated sulphuric acid. The effect of catalyst preparation variables including carbonization temperature, carbonization time, sulfonation temperature and sulfonation time was evaluated using response surface methodology. T

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Xu, Gui-Zhuan, Chun Chang, Wei-Na Zhu, Bo Li, Xiao-Jian Ma, and Feng-Guang Du. "A comparative study on direct production of ethyl levulinate from glucose in ethanol media catalysed by different acid catalysts." Chemical Papers 67, no. 11 (2013). http://dx.doi.org/10.2478/s11696-013-0410-0.

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AbstractDirect production of ethyl levulinate (EL) from glucose catalysed by a liquid acid catalyst (sulfuric acid) and a solid acid zeolite catalyst USY NKF-7 (USY) in ethanol media was investigated in this study. Effects of the initial glucose concentration (C G0), reaction temperature (T), amount of acid catalyst, and water addition on the yields of EL were compared, respectively. The results show that higher yield of EL can be obtained at lower C G0. Higher temperature and acid concentration can accelerate the reaction rate, but the formation rate of the by-products increases more quickly

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Mon, Marta, Rosaria Bruno, Sergio Sanz-Navarro, et al. "Hydrolase–like catalysis and structural resolution of natural products by a metal–organic framework." Nature Communications 11, no. 1 (2020). http://dx.doi.org/10.1038/s41467-020-16699-3.

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Abstract The exact chemical structure of non–crystallising natural products is still one of the main challenges in Natural Sciences. Despite tremendous advances in total synthesis, the absolute structural determination of a myriad of natural products with very sensitive chemical functionalities remains undone. Here, we show that a metal–organic framework (MOF) with alcohol–containing arms and adsorbed water, enables selective hydrolysis of glycosyl bonds, supramolecular order with the so–formed chiral fragments and absolute determination of the organic structure by single–crystal X–ray crystal

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Boughachiche, F., K. Rachedi, H. Zerizer, et al. "Production of Protease on Wheat Bran by a Newly Isolated Streptomyces SP. Under Solid State Fermentation." Journal of Bio-Science, July 11, 2021, 33–48. http://dx.doi.org/10.3329/jbs.v29i0.54820.

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Proteases are a group of enzymes that catalyse the degradation of proteins resulting in the production of their amino acid constituents. In the present study newly isolated Streptomyces sp. was subjected to produce proteases through solid state fermentation while wheat bran was used as substrate. To produce proteases, a local strain Streptomyces sp. was isolated from a soil sample of Ezzemouls saltpan, located in Ain M'lila (East of Algeria). The phenotypic and phylogenetic studies of this strain showed that it represents probably a new species. The SSF production medium for Streptomyces sp. w

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