69 research outputs found
A Simple and Efficient Device and Method for Measuring the Kinetics of Gas-Producing Reactions
A Simple and Efficient Device and Method for Measuring the Kinetics of Gas-Producing Reactions
Glycerol valorization: dehydration to acrolein over silica-supported niobia catalysts
The catalytic dehydration of glycerol to acrolein is investigated over silica-supported niobia catalysts in a continuous fixed-bed gas-phase reactor. Various supported niobia catalysts are prepared and characterized using surface analysis and spectroscopic methods (XRD, UVāVis, XPS, N2 adsorption), as well as with ammonia adsorption microcalorimetry. Good results are obtained with initial glycerol conversions of over 70% and with 50ā70% selectivity to acrolein. We investigate the influence of changing the catalyst acid strength by varying the niobia content and catalyst calcination temperature. Glycerol conversion and acrolein selectivity depend on the surface acid strength. Catalyst deactivation by coking is also observed, but simple oxidative treatment in air restores the activity of the catalysts completely
Double aberration-corrected TEM/STEM of tungstated zirconia nanocatalysts for the synthesis of paracetamol
Mesoporous Silica with SiteāIsolated Amine and Phosphotungstic Acid Groups: A Solid Catalyst with Tunable Antagonistic Functions for OneāPot Tandem Reactions
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