Isolation, Characterization, and Identification of Catalytically Active Species in the MoO3/SiO2Catalyst during Solid Acid Catalyzed Reactions

ChemCatChem ◽  
2013 ◽  
Vol 5 (6) ◽  
pp. 1531-1537 ◽  
Author(s):  
Trupti V. Kotbagi ◽  
Ankush V. Biradar ◽  
Shubhangi B. Umbarkar ◽  
Mohan K. Dongare
Keyword(s):  
Solid Acid ◽  
Active Species ◽  
Catalytically Active ◽  
Acid Catalyzed ◽  
Catalyzed Reactions

Solvent effects in solid acid-catalyzed reactions: The case of the liquid-phase isomerization/cyclization of citronellal over SiO2-Al2O3

2020 ◽  
Vol 481 ◽  
pp. 110192 ◽  
Author(s):  
Nicolás M. Bertero ◽  
Andrés F. Trasarti ◽  
María C. Acevedo ◽  
Alberto J. Marchi ◽  
Carlos R. Apesteguía
Keyword(s):  
Liquid Phase ◽  
Solvent Effects ◽  
Solid Acid ◽  
Acid Catalyzed ◽  
Catalyzed Reactions

Following Solid-Acid-Catalyzed Reactions by MAS NMR Spectroscopy in Liquid Phase-Zeolite-Catalyzed Conversion of Cyclohexanol in Water

2013 ◽  
Vol 53 (2) ◽  
pp. 479-482 ◽  
Author(s):  
Aleksei Vjunov ◽  
Mary Y. Hu ◽  
Ju Feng ◽  
Donald M. Camaioni ◽  
Donghai Mei ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Liquid Phase ◽  
Solid Acid ◽  
Mas Nmr ◽  
Acid Catalyzed ◽  
Catalyzed Reactions

scholarly journals Sulfonic Acid-Functionalized Inorganic Materials as Efficient Catalysts in Various Applications: A Minireview

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1143
Author(s):  
Maria Luisa Testa ◽  
Valeria La Parola
Keyword(s):  
Acid Catalysis ◽  
Solid Acid ◽  
Catalyst Particle ◽  
Mineral Acid ◽  
Magnetic Core ◽  
Inorganic Materials ◽  
Green Solvents ◽  
Acid Catalyzed ◽  
Catalyzed Reactions ◽  
Synthetic Approaches

Acid catalysis is widely used in the chemical industry, and nowadays many efforts are being focused on replacing the more common homogeneous catalysts with heterogeneous ones in order to make greener the industrial processes. In this perspective, sulfonic solid acid materials represent a valid alternative to the homogenous mineral acid in several acid catalyzed reactions. In this minireview, an overview of the recent advances on the preparation, stability and application of these materials is reported. Special attention is addressed to the sustainability of the considered processes, starting from the catalyst’s preparation, the use of green solvents and reducing the possible reaction steps. Ways to tackle the main drawback represented by easy leaching of acid groups are described. For an easy catalyst recovery, the use of a magnetic core in a catalyst particle, with the related synthetic approaches, is also illustrated. Finally, a section is dedicated to the principal characterization techniques to identify the structural properties of the catalysts.

Following Solid-Acid-Catalyzed Reactions by MAS NMR Spectroscopy in Liquid Phase-Zeolite-Catalyzed Conversion of Cyclohexanol in Water

2013 ◽  
Vol 126 (2) ◽  
pp. 489-492 ◽  
Author(s):  
Aleksei Vjunov ◽  
Mary Y. Hu ◽  
Ju Feng ◽  
Donald M. Camaioni ◽  
Donghai Mei ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Liquid Phase ◽  
Solid Acid ◽  
Mas Nmr ◽  
Acid Catalyzed ◽  
Catalyzed Reactions

The Initial Stages of Solid Acid-Catalyzed Reactions of Adsorbed Propane. A Mechanistic Study by in Situ MAS NMR

2004 ◽  
Vol 126 (2) ◽  
pp. 599-606 ◽  
Author(s):  
Mohamed Haouas ◽  
Stéphane Walspurger ◽  
Francis Taulelle ◽  
Jean Sommer
Keyword(s):  
Solid Acid ◽  
Mas Nmr ◽  
Mechanistic Study ◽  
Acid Catalyzed ◽  
Catalyzed Reactions

Sewage sludge as a precursor of adsorbents/catalysts for environmental applications

2007 ◽  
Vol 2 (1) ◽  
Author(s):  
A. Ros ◽  
C. Canals-Batlle ◽  
M.A. Lillo-Ródenas ◽  
E. Fuente ◽  
M. A. Montes-Morán ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Room Temperature ◽  
Waste Water Treatment ◽  
Textural Properties ◽  
Active Species ◽  
Elemental Sulphur ◽  
Gaseous Emissions ◽  
Removal Experiments ◽  
Catalytically Active

This paper focuses on the valorisation of solid residues obtained from the thermal treatment of sewage sludge. In particular, sewage sludge samples were collected from two waste water treatment plants (WWTPs) with different sludge line basic operations. After drying, sludges were heated up to 700 °C in appropriate ovens under diluted air (gasification) and inert (pyrolysis) atmospheres. The solids obtained, as well as the dried (raw) sludges, were characterised to determine their textural properties and chemical composition, including the speciation of their inorganic fraction. All the materials under study were employed as adsorbents/catalysts in H2S removal experiments at room temperature. It was found that, depending on the particular sludge characteristics, outstanding results can be achieved both in terms of retention capacities and selectivity. Some of the solids outperform commercially available sorbents specially designed for gaseous emissions control. In these adsorbents/catalysts, H2S is selectively oxidised to elemental sulphur most likely due to the presence of inorganic, catalytically active species. The role of the carbon-enriched part on these solids is also remarked.

Photoinduced rearrangement of hydroxymethylisoxazolines, a route to enaminoaldehydes

1986 ◽  
Vol 51 (10) ◽  
pp. 2167-2180 ◽  
Author(s):  
Lubor Fišera ◽  
Nadezhda D. Kozhina ◽  
Peter Oravec ◽  
Hans-Joachim Timpe ◽  
Ladislav Štibrányi ◽  
...  
Keyword(s):  
Thionyl Chloride ◽  
Quantum Yields ◽  
Acid Catalyzed ◽  
Catalyzed Reactions ◽  
Photoinduced Rearrangement ◽  
Condensed Heterocycles

3-Aryl-4-R-carbamoyl-5-hydroxymethylisoxazolines (IV) were synthesized by allowing R-NH2 amines with R = H, CH3, C3H7, C6H5C2H5, and NH2 to act on 3-(X-phenyl)-4-oxo-3a,4,6,6a-tetrahydrofuro[3,4-d]isoxazoles (III) with X = H, 4-CH3, 4-OCH3, 2-OCH3, 4-Cl, 2-Cl, 4-F, 2-F, 4-Br, 4-NO2, and 3-NO2. Exposed to radiation, the substances IV give Z-2-hydroxymethylamino-2-aryl-1-formylacrylamides (V) in good yields. The 4-Cl and 4-F substituted Z-derivatives V isomerize irreversibly to the E-derivatives VI if allowed to stand in solvent; the remaining derivatives V are stable. The quantum yields of the photoreaction are from 0.012 to 0.106 in dependence on the substituent X. In all cases where the compounds IV were used for the preparation of condensed heterocycles in conditions of acid-catalyzed reactions, lactones III were preferentially formed; the action of thionyl chloride on IV results in the formation of chloromethyl derivatives VIII, which do not undergo further cyclization.

Probing the Catalytically Active Species in POM‐catalysed DNA‐model Hydrolysis

2021 ◽  
Author(s):  
Frederico F Martins ◽  
Ángel Sánchez-González ◽  
Jose Lanuza ◽  
Haralampos N. Miras ◽  
Xabier Lopez ◽  
...  
Keyword(s):  
Active Species ◽  
Catalytically Active

Synthetic Scope of Brønsted Acid-Catalyzed Reactions of Carbonyl Compounds and Ethyl Diazoacetate

2021 ◽  
Author(s):  
Mizzanoor Rahaman ◽  
M. Shahnawaz Ali ◽  
Khorshada Jahan ◽  
Damon Hinz ◽  
Jawad Bin Belayet ◽  
...  
Keyword(s):  
Carbonyl Compounds ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Ethyl Diazoacetate ◽  
Brönsted Acid ◽  
Acid Catalyzed ◽  
Catalyzed Reactions
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