ChemInform Abstract: VAPOR-PHASE DIRECT HYDRATION OF ETHYLENE OVER ZIRCONIUM TUNGSTATE CATALYST. II. CATALYTIC BEHAVIOR AT HIGH PRESSURES

1983 ◽  
Vol 14 (8) ◽  
Author(s):  
H. MOMOSE ◽  
K. KUSUMOTO ◽  
Y. IZUMI ◽  
Y. MIZUTANI
Keyword(s):  
Vapor Phase ◽  
High Pressures ◽  
Catalytic Behavior ◽  
Zirconium Tungstate

Catalytic behavior of chromia and chromium-doped alumina pillared clay materials for the vapor phase deep oxidation of chlorinated hydrocarbons

1997 ◽  
Vol 115 (2) ◽  
pp. 329-338 ◽  
Author(s):  
Loretta Storaro ◽  
Renzo Ganzerla ◽  
Maurizio Lenarda ◽  
Roberto Zanoni ◽  
Antonio Jiménez López ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Chlorinated Hydrocarbons ◽  
Pillared Clay ◽  
Deep Oxidation ◽  
Catalytic Behavior ◽  
Clay Materials

STUDIES ON HOMOGENEOUS FIRST ORDER GAS REACTIONS: V. THE DECOMPOSITION OF PARACETALDEHYDE AT HIGH PRESSURES

1934 ◽  
Vol 11 (2) ◽  
pp. 180-189 ◽  
Author(s):  
A. L. Geddes ◽  
C. C. Coffin
Keyword(s):  
Liquid Phase ◽  
Critical Point ◽  
Vapor Phase ◽  
High Pressures ◽  
Heterogeneous Systems ◽  
Homogeneous Reaction ◽  
Reaction Velocity ◽  
First Order ◽  
Gas Reactions ◽  
Liquid Vapor

The homogeneous first order gaseous decomposition of paraldehyde to acetaldehyde has been studied at temperatures from 230 to 254 °C. up to pressures at which the liquid phase makes its appearance, i.e., 12 atm. at 230° and 18 atm. at 254 °C. Over-all velocity constants for the homogeneous reaction in the heterogeneous liquid-vapor system have been determined from these pressures up to the critical point. The data confirm results already published. It is found that in the purely gaseous system increase of pressure tends to diminish the reaction velocity. That the specific reaction velocity in the liquid phase is greater than that in the vapor phase is shown by the fact that the velocity constants of the heterogeneous systems increase progressively with the liquid-vapor ratio. Extrapolation to 100% of liquid gives velocity constants about five times as great as those characteristic of the vapor phase. Peculiarities in the behavior of the system at the critical point and preliminary measurements of the velocity of the trimolecular reverse reaction are described.

scholarly journals Influence of the Incorporation of Basic or Amphoteric Oxides on the Performance of Cu-Based Catalysts Supported on Sepiolite in Furfural Hydrogenation

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 315 ◽  
Author(s):  
Antonio Guerrero-Torres ◽  
Carmen Jiménez-Gómez ◽  
Juan Cecilia ◽  
Cristina García-Sancho ◽  
José Quirante-Sánchez ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Vapor Phase ◽  
Furfuryl Alcohol ◽  
Main Product ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Cu Nanoparticles ◽  
Catalytic Behavior ◽  
Furfural Hydrogenation ◽  
Catalytic Deactivation

Cu-based catalysts supported on sepiolite have been tested in vapor-phase hydrogenation of furfural. The incorporation of basic or amphoteric metal oxides (magnesium oxide, zinc oxide, or cerium oxide) improves the catalytic behavior, reaching a maximum furfural conversion above 80% after 5 h of reaction at 210 °C. In all cases, the main product is furfuryl alcohol, obtaining 2-methylfuran in lower proportions. The incorporation of these metal oxide species ameliorates the dispersion of metallic Cu nanoparticles, increasing the number of available Cu0-sites, which enhances the catalytic performance. The presence of acid sites favors the hydrogenolysis of furfuryl alcohol towards 2-methylfuran, although it also causes an increase of carbon species on its surface, which is associated with the catalytic deactivation of the catalyst along the time-on-stream.

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