scholarly journals In SituDiffuse Reflectance Spectroscopy of Supported Chromium Oxide Catalysts:  Kinetics of the Reduction Process with Carbon Monoxide

1997 ◽  
Vol 101 (15) ◽  
pp. 2824-2829 ◽  
Author(s):  
Abdelhamid Bensalem ◽  
Bert M. Weckhuysen ◽  
Robert A. Schoonheydt
Keyword(s):  
Carbon Monoxide ◽  
Chromium Oxide ◽  
Reduction Process ◽  
Reflectance Spectroscopy ◽  
Oxide Catalysts ◽  
Chromium Oxide Catalysts ◽  
Kinetics Of

Diffuse Reflectance Spectroscopy of Supported Chromium Oxide Catalysts: A Self-Modeling Mixture Analysis

1997 ◽  
Vol 166 (2) ◽  
pp. 160-171 ◽  
Author(s):  
Bert M. Weckhuysen ◽  
An A. Verberckmoes ◽  
Alexander R.De Baets ◽  
Robert A. Schoonheydt
Keyword(s):  
Chromium Oxide ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
Oxide Catalysts ◽  
Mixture Analysis ◽  
Chromium Oxide Catalysts

Dehydrogenation of Substituted Alcohols to Aldehydes on Zinc Oxide-Chromium Oxide Catalysts

1992 ◽  
Vol 57 (11) ◽  
pp. 2215-2226 ◽  
Author(s):  
Daniela Gulková ◽  
Miloš Kraus
Keyword(s):  
Zinc Oxide ◽  
Chromium Oxide ◽  
Substituent Effects ◽  
Oxide Catalysts ◽  
Catalytic Dehydrogenation ◽  
Primary Alcohols ◽  
Solid Catalysts ◽  
Type Rate ◽  
Chromium Oxide Catalysts ◽  
Kinetics Of

Sixteen primary alcohols of the structure RCH2OH (R = CH3, C2H5, (CH3)2CH, (CH3)3CCH2, HOCH2, CH3OCH2, C6H5, C6H5CH2, C6H5OCH2, ClCH2, BrCH2, F3C, CNCH2, (CH3)2NCH2, (C2H5)2NCH2 and tetrahydrofurfuryl) were explored for the possibility of obtaining the corresponding aldehydes by dehydrogenation on solid catalysts. Various catalysts were tested and two zinc oxide-chromium oxide catalysts were selected for further work because their activity and selectivity was satisfactory; moreover, the selectivity could be improved by addition of sodium into the catalysts and of water into the feed. The reaction was performed in the temperature range 250-450 °C and at atmospheric pressure. 2-Chloroethanol, 2-bromoethanol, ethylene glycol, 2-cyanoethanol and 2-(N,N-diethylamino)ethanol decomposed and deactivated the catalyst. The other alcohols were studied from the point of kinetics of dehydrogenation, which was described by a Langmuir-Hinshelwood type rate equation (3), and of substituent effects on rate, which were correlated by Taft equation (1) with the slope ρ = -1.46. The preparative value of catalytic dehydrogenation for obtaining substituted aldehydes was confirmed by prolonged runs and isolation of the aldehydic product by distillation using as the feeds 2-methoxyethanol and 2-(N,N-dimethylamino)ethanol, respectively.

Sign in / Sign up

Export Citation Format

Share Document