IR Spectroscopic Study of the Skeletal Isomerization of Butene by Alumina-Supported Tungsten Oxide Catalysts

Recent Advances in Bifunctional Catalysts for the Fischer–Tropsch Process: One-Stage Production of Liquid Hydrocarbons from Syngas

“…The synergy between the Brønsted and Lewis sites, however, could be gaining ground according to recent results. For example, Meijers et al proposed that the performance of their catalyst may be due to the synergy between the Brønsted and the Lewis acid sites. ,,, On the other hand, the location of the Brønsted acid sites has an effect on selectivity: when the acid sites are located at the external surface or inside the micropores near the external surface, the intermediary carbons formed from the hydrocracking and isomerization reactions diffuse quickly, avoiding overcracking . This also occurs in mesoporous structures.…”

Hydrothermal synthesis of anatase nanocrystals with lattice and surface doping tungsten species

“…26 In the field of catalysis, titania has been used as a support to form surface-bound tungsten species (surface wolframyl groups). The tungsten oxides species are known to be efficient catalysts for olefin methathesis, 27 ethane homologation, 28 selective reduction of NO x , 29 and oxidation of organic molecules. 10,18 The nature of the surface wolframyl group has been probed by vibrational spectroscopies and other methods.…”

In Situ Diffuse Reflectance Spectroscopy of Supported Chromium Oxide Catalysts: Kinetics of the Reduction Process with Carbon Monoxide

“…In order to study real catalytic conditions as closely as possible, in situ measurements are recommended. Up to now, measurements of the catalytic action under in situ conditions were possible with Fourier transform infrared, − diffuse reflectance infrared Fourier transform, − Raman, − X-ray powder diffractometry, and extended X-ray absorption fine structure spectroscopies . Although diffuse reflectance spectroscopy (DRS) is ideally suited for probing the oxidation state and coordination environment of TMI and for their quantitative speciation, its application on supported metal oxide catalysts was not yet possible at high temperature in the presence of substrates.…”