Buscar
Mostrando ítems 21-30 de 99
Direct sulfation of a Zr-based metal-organic framework to attain strong acid catalysts
(Elsevier Science, 2019-08)
The application of Metal-Organic Frameworks (MOFs) in gas phase heterogeneous catalysis is still not widely spread because of their limited stability under reaction conditions. Obtaining stable acidic MOFs to be used in ...
Insights on the catalytic behaviour of sulfonic acid-functionalized ionic liquids (ILs) in transesterification reactions - voltammetric characterization of sulfonic task-specific ILs with bisulfate anions
(Royal Society of Chemistry, 2021-01)
This work shows for the first time the link between the amount of free sulfuric acid (as detected by cyclic voltammetry) and the activity of sulfonic-acid-functionalized ionic liquids (ILs) as acid catalysts for a ...
Synthesis of silica-based materials using bio-residues through the sol-gel technique
(Multidisciplinary Digital Publishing Institute, 2021-11)
This study focused on the use of citrus bio-waste and obtention of silica-based materialsthrough the sol-gel technique for promoting a greener and more sustainable catalysis. The solgel method is a versatile synthesis route ...
Correlation between catalysis and tertiary structure arrangement in an archaeal halophilic subtilase
(Elsevier Masson, 2012-03)
Nep (Natrialba magadii extracellular protease) is a halolysin-like peptidase secreted by the haloalkaliphilic archaeon N. magadii that exhibits optimal activity and stability in salt-saturated solutions. In this work, the ...
Selective gas-phase conversion of maleic anhydride to propionic acid on Pt-based catalysts
(Elsevier, 2013-02)
Pt-based catalysts, supported on Al2O3, SiO2 and SiO2-Al2O3, were prepared by incipient wetness impregnation and tested in the gas phase hydrogenation of maleic anhydride at atmospheric pressure and 240 °C. In these ...
Screening of Novel Materials for Biodiesel Production Through the Esterification of Oleic Acid
(Springer, 2016-11)
The present contribution screens the specific activity of various inorganic and enzymatic based materials in the esterification of oleic acid that is typically used as a test reaction for the production of biodiesel from ...
Influence of acidic properties of different solid acid catalysts for glycerol acetylation
(Elsevier Science, 2017-07)
The glycerol esterification with acetic acid is studied in this work using propylsulfonic functionalizedmesoporous silica (Pr-SO3H-SBA-15), and compared with H-ZSM-5 and H-Beta zeolites. The reactionwas carried out in a ...
Upgrading of diols by gas-phase dehydrogenation and dehydration reactions on bifunctional Cu-based oxides
(Royal Society of Chemistry, 2014-06)
Biomass-derived short chain polyols can be transformed in valuable oxygenates used as building blocks. The gas phase conversion of a model molecule of 1,3-diols (1,3-butanediol) was studied on bifunctional Cu-Mg, Cu-Al and ...
Reaction between N-alkylhydroxylamines and chiral enoate esters: More experimental evidence for a cycloaddition-like process, a rationale based on DFT theoretical calculations, and stereoselective synthesis of new enantiopure β-amino acids
(American Chemical Society, 2002-12)
The reactions between N-benzyl- and N-methylhydroxylamine and chiral enoate esters, derived from D-glyceraldehyde and (-)-verbenone, respectively, have been investigated. Theoretical calculations show that the most favorable ...
Novel catalyst based on mono- and di-vanadium substituted Keggin polyoxometalate incorporated in poly(acrylic acid-co-acrylamide) polymer for the oxidation of sulfides
(Elsevier Science, 2018-10)
Composite materials based on [PVxW12-xO40](3+x)− with x = 1 or 2 (PVW and PV2W respectively), included in poly(acrylic acid-co-acrylamide) gel (PAACA), were synthesized. The samples were characterized by different techniques ...