scholarly journals Facile Hydrogenative Deprotection of N-Benzyl Groups Using a Mixed Catalyst of Palladium and Niobic Acid-on-Carbon

ACS Omega ◽  
2020 ◽  
Vol 5 (6) ◽  
pp. 2699-2709 ◽  
Author(s):  
Yuta Yamamoto ◽  
Eisho Shimizu ◽  
Kazuho Ban ◽  
Yoshiyuki Wada ◽  
Tomoteru Mizusaki ◽  
...  
Keyword(s):  
Mixed Catalyst ◽  
Niobic Acid

Niobic Acid as a Recyclable Heterogeneous Catalyst for the Solvent-Free Synthesis of Substituted Benzimidazoles

2013 ◽  
Vol 1 (2) ◽  
pp. 136-144 ◽  
Author(s):  
Beatriz Vieira ◽  
Angelita Barcellos ◽  
Ricardo Schumacher ◽  
Eder Lenardao ◽  
Diego Alves
Keyword(s):  
Heterogeneous Catalyst ◽  
Solvent Free ◽  
Niobic Acid ◽  
Recyclable Heterogeneous Catalyst ◽  
Solvent Free Synthesis

Effect of ionizing radiation on the kinetics of hydrogenation on the Ni-MgO mixed catalyst

1982 ◽  
Vol 47 (7) ◽  
pp. 1780-1786 ◽  
Author(s):  
Rostislav Kudláček ◽  
Jan Lokoč
Keyword(s):  
Experimental Data ◽  
Activation Energy ◽  
Liquid Phase ◽  
Ionizing Radiation ◽  
Oxide Catalyst ◽  
Absorbed Dose ◽  
Hydrogenation Rate ◽  
Solution Composition ◽  
Mixed Catalyst ◽  
Kinetics Of

The effect of gamma pre-irradiation of the mixed nickel-magnesium oxide catalyst on the kinetics of hydrogenation of maleic acid in the liquid phase has been studied. The changes of the hydrogenation rate are compared with the changes of the adsorbed amount of the acid and with the changes of the solution composition, activation energy, and absorbed dose of the ionizing radiation. From this comparison and from the interpretation of the experimental data it can be deduced that two types of centers can be distinguished on the surface of the catalyst under study, namely the sorption centres for the acid and hydrogen and the reaction centres.

Catalytic Supercritical Water Oxidation for the Destruction of Quinoline Over MnO2/CuO Mixed Catalyst

2009 ◽  
Vol 48 (3) ◽  
pp. 1208-1214 ◽  
Author(s):  
Mauricio J. Angeles-Hernández ◽  
Gary A. Leeke ◽  
Regina C. D. Santos
Keyword(s):  
Supercritical Water ◽  
Water Oxidation ◽  
Supercritical Water Oxidation ◽  
Mixed Catalyst

scholarly journals Reactivity and Reusability of Mesoporous Alumina Nanoparticles Modified with Sulfuric Acid and Niobic Acid in the Alkylation of Resorcinol

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Zainab Ramli ◽  
Hadi Nur ◽  
Sheela Chandren
Keyword(s):  
Sulfuric Acid ◽  
High Surface ◽  
Mesoporous Alumina ◽  
Alumina Nanoparticles ◽  
Lewis Acidity ◽  
Methyl Tert Butyl Ether ◽  
Solid Catalyst ◽  
Brønsted Acidity ◽  
Brönsted Acidity ◽  
Niobic Acid

With the development of large molecule hydrocarbon processes, mesoporous alumina which possesses high surface area with narrow pore size distribution has received a great deal of attention. However, its acid properties lack Bronsted acidity and showed only Lewis acid sites, making it an inactive solid catalyst in the alkylation of resorcinol, a reaction which requires the usage of solid acid catalysts with both Bronsted and Lewis acidity. In this study, in order to introduce Bronsted acidity to mesoporous alumina, sulfuric acid (H2SO4) and niobic acid (Nb2O5.nH2O) are introduced to the alumina. The reactivity of mesoporous alumina nanoparticles (MAN), Nb2O5.nH2O/MAN and H2SO4/MAN were tested out on the alkylation of resorcinol with methyl tert-butyl ether. No product was obtained using pure MAN, while both H2SO4/MAN and Nb2O5.nH2O/MAN managed to produce butylated resorcinol. Mesoporous alumina nanoparticles incorporated with sulfuric acid produced a greater amount of dibutylated resorcinol, which theoretically is a better antioxidant compared to monobutylated resorcinol. The reusability of the H2SO4/MAN catalyst was also better as dibutylated product was still obtained even in the second use. This indicates that sulfuric acid has created a more stable and also higher strength of Bronsted acidity in alumina as compared to niobic acid.

Biomass catalytic pyrolysis to produce olefins and aromatics with a physically mixed catalyst

2013 ◽  
Vol 140 ◽  
pp. 256-262 ◽  
Author(s):  
Huiyan Zhang ◽  
Rui Xiao ◽  
Baosheng Jin ◽  
Guomin Xiao ◽  
Ran Chen
Keyword(s):  
Catalytic Pyrolysis ◽  
Mixed Catalyst ◽  
Physically Mixed Catalyst

Layered niobic acid with self-exfoliatable nanosheets and adjustable acidity for catalytic hydration of ethylene oxide

2011 ◽  
Vol 280 (2) ◽  
pp. 247-254 ◽  
Author(s):  
Zhi-Jian Yang ◽  
Ye-Fei Li ◽  
Qing-Bin Wu ◽  
Nan Ren ◽  
Ya-Hong Zhang ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Niobic Acid
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