Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Vinit Choudhary"'
Autor:
Dionisios G. Vlachos, Vladimiros Nikolakis, Christina Bagia, Vinit Choudhary, T. Dallas Swift, George Peklaris
Publikováno v:
ACS Catalysis. 4:259-267
We perform the first extensive experimental kinetic studies of fructose dehydration and 5-hydroxymethyl furfural (HMF) rehydration at low temperatures over a wide range of conditions (T ∼ 70–150 °C; pH values 0.7–1.6 and initial concentrations
Publikováno v:
ChemSusChem. 6:2369-2376
Herein, the first comparison of the mechanisms of glucose-to-fructose isomerization in aqueous media enabled by homogeneous (CrCl3 and AlCl3 ) and heterogeneous catalysts (Sn-beta) by using isotopic-labeling studies is reported. A pronounced kinetic
Publikováno v:
ACS Catalysis. 3:1279-1291
The main paths by which zeolites carry out the dehydration of fructose to HMF and the rehydration of HMF to levulinic acid in aqueous solutions are elucidated using an H-BEA zeolite with SiO2/Al2O3 = 18 (H-BEA-18) as a representative solid acid catal
Autor:
Andrzej Anderko, Vladimiros Nikolakis, Nebojsa Marinkovic, Christopher R. Ho, Anatoly I. Frenkel, Vinit Choudhary, Stanley I. Sandler, Dionisios G. Vlachos, Samir H. Mushrif
Publikováno v:
Journal of the American Chemical Society. 135:3997-4006
5-(Hydroxymethyl)furfural (HMF) and levulinic acid production from glucose in a cascade of reactions using a Lewis acid (CrCl3) catalyst together with a Brønsted acid (HCl) catalyst in aqueous media is investigated. It is shown that CrCl3 is an acti
Publikováno v:
ACS Catalysis. 2:2022-2028
The role of molecular structure on pentose dehydration to furfural has been examined using HCl as a Bronsted acid catalyst in a single phase aqueous media. It is shown that xylulose dehydration results in a much higher furfural yield than xylose dehy
Publikováno v:
The Journal of Physical Chemistry C. 116:5116-5120
The G4 ab initio method was used in combination with the COSMO-SAC solvation model to predict the reaction free energies (ΔG) of glucose dehydration reactions in mixtures of water and dimethyl sulf...
Publikováno v:
ACS Catalysis. 1:1724-1728
A nonenzymatic route for xylose isomerization in an aqueous medium using zeolite Sn-beta as a catalyst is demonstrated. Xylulose and lyxose are the primary and secondary products. The maximum yield to xylulose is 27%, with an 11% yield to lyxose at
Publikováno v:
Carbohydrate research. 368
We present electronic structure calculations on the isomerization and epimerization of xylose to xylulose and lyxose, respectively, by a zeolite Sn–BEA model at the MP2 and B3LYP theory levels. Benchmarking calculations at the CCSD(T) theory level
Autor:
T. Dallas Swift, Christina Bagia, Vinit Choudhary, George Peklaris, Vladimiros Nikolakis, Dionisios G. Vlachos
Publikováno v:
ACS Catalysis. 4:1320-1320
Autor:
K. G. Ayappa, Vinit Choudhary
Publikováno v:
Physical Chemistry Chemical Physics. 9:1952
The density of states of rare gas atoms confined in carbon nanotubes is analyzed using a recently proposed model based on gamma distributions [Krishnan and Ayappa, J. Chem. Phys., 124 144503 (2006)]. The inputs into the model are the 2nd and 4th freq