Catalysis Communications

Journal: Catalysis Communications

Publisher

Elsevier

ISSN

1566-7367
1873-3905

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Publications 1 - 10 of 11

By-product co-feeding reveals insights into the role of zinc on methanol synthesis catalysts
Santiago, Marta; Barbera, Katia; Ferreira, Cristina; et al. (2012)
Catalysis Communications
Influence of the support in aqueous phase oxidation of ethanol on gold/metal oxide catalysts studied by ATR-IR spectroscopy under working conditions
Waheed, Ammara; Wang, Xianwei; Maeda, Nobutaka; et al. (2021)
Catalysis Communications
Effects of supports (Co3O4, CeO2, NiO) in the gold-catalyzed aqueous phase oxidation of ethanol (EtOH) to acetic acid (AcOH) were examined. ATR-IR spectroscopy under working conditions of the catalysts uncovered on gold particles bidentate ethoxy, and on supports monodentate ethoxy species, multi-layered ethanol, and acetate. Preferential formation of bidentate ethoxy species and adsorbed EtOH were identified as key factors for high activity and selectivity to AcOH. These requirements were best matched with Au/Co3O4. On NiO, monodentate ethoxy species on the support deteriorated the catalytic performance due to consecutive esterification of AcOH and/or acetate species with EtOH producing undesirable ethyl acetate.
In situ infrared spectroscopy on the gas phase hydrogenation of nitrobenzene
Hartfelder, U.; Kartusch, C.; Sa, J.; et al. (2012)
Catalysis Communications
Conversion of sugar diacetyls to bio-hydrocarbons by the catalytic cracking in a fixed bed with fresh and deactivated Beta zeolite
Cardoso, Cristiane; Lam, Yiu Lau; San Gil, Rosane A.S.; et al. (2022)
Catalysis Communications
The conversion of biomass into fuel under typical refinery conditions is a promising solution to decrease carbon footprint. Herein we convert a representative compound of a new bio-petroleum, DX (1,2:3,5-di-O-isopropylidene-α-D-xylofuranose) mixture with n-hexane. Firstly fresh zeolites (Beta, ZSM-5 and USY) were explored. Beta zeolite showed a high performance in converting DX into hydrocarbons. Thus it was further modified by hydrothermal deactivation. This treatment reduced the acid site density of Beta, resulting in an improvement in aromatics, reducing gas 2-fold and coke 1-fold, and only leaving a small amount of oxygenates in the liquid fraction in the test with 20% DX.
Formaldehyde, methanol and methyl formate from formic acid reaction over supported metal catalysts
Beloqui Redondo, A.; Fodor, D.; Brown, M.A.; et al. (2014)
Catalysis Communications
Stepwise conversion of methane to methanol over Cu-mordenite prepared by supercritical and aqueous ion exchange routes and quantification of active Cu species by H2-TPR
Yousefzadeh, Hamed; Bozbag, Selmi E.; Sushkevich, Vitaly; et al. (2023)
Catalysis Communications
Copper-exchanged mordenite prepared by supercritical ion exchange (SCIE) and aqueous ion exchange (AIE) were investigated in stepwise conversion of methane to methanol. Increasing the oxygen activation temperature and methane reaction time enhances the methanol yield of copper-exchanged mordenite prepared by SCIE (Cu-MORS). The reducibility of Cu-MORS was compared with those of Cu-MORA prepared by aqueous ion exchange (AIE) using H2-TPR. It was demonstrated for the first time that deconvoluted H2-TPR profile coupled with effects of Cu loading and oxygen activation temperature on methanol yield data can be used to distinguish the active Cu sites from inactive ones based on their reduction temperature. The copper species responsible for methane activation were found to be reduced below 150 °C by H2 in both Cu-MORS and Cu-MORA. From the stoichiometry of the reaction of H2 with Cu2+ species, the average number of copper atoms of active sites were calculated as 2.07 and 2.80 for Cu-MORS and Cu-MORA, respectively. Differences in structure of copper species caused by the synthesis routes were also detected by in-situ FTIR upon NO adsorption indicating a higher susceptibility of Cu-MORS towards autoreduction. The results demonstrated the potential of TPR based methods to identify copper active sites and suggested the importance of site selective ion exchange in order to controllably synthesize active Cu species in zeolites.
Bulk and Al2O3-supported Ni2P HDS catalysts prepared by separating the nickel and hypophosphite sources
Liu, Dapeng; Wang, Anjie; Liu, Chenguang; et al. (2016)
Catalysis Communications
DRIFTS study of the catalytic N2O reduction by SO2 on FeZSM-5
Abello, Sonia; Hevia, Miguel A.G.; Santiago, Marta; et al. (2010)
Catalysis Communications
Isocyanic acid hydrolysis over Fe-ZSM5 in urea-SCR
Piazzesi, Gaia; Devadas, Mukundan; Kröcher, Oliver; et al. (2006)
Catalysis Communications
Origin of the cluster-size effect in the hydrogenation of cinnamaldehyde over supported Au catalysts
Bus, Eveline; Prins, Roel; van Bokhoven, Jeroen A. (2007)
Catalysis Communications

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Journal: Catalysis Communications

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