Advances in catalytic dehydrogenation of ethanol to acetaldehyde

2021 ◽  
Author(s):  
Jifeng Pang ◽  
Ming Yin ◽  
Pengfei Wu ◽  
Xianquan Li ◽  
Haoyu Li ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Oxidative Dehydrogenation ◽  
Catalytic Dehydrogenation ◽  
Dehydrogenation Of Ethanol

This review summarizes the recent catalyst achievements in oxidative and non-oxidative dehydrogenation of ethanol, and analyzes the reaction mechanism over typical catalysts.

scholarly journals Influence of incorporating a small amount of silica on the catalytic performance of a MoO3/Al2O3 catalyst in ethanol oxidative dehydrogenation

2018 ◽  
Vol 16 (6) ◽  
Author(s):  
Aline Villarreal ◽  
Gabriella Garbarino ◽  
Paola Riani ◽  
Aida Gutiérrez Alejandre ◽  
Jorge Ramírez ◽  
...  
Keyword(s):  
Oxidative Dehydrogenation ◽  
Active Sites ◽  
Catalytic Performance ◽  
Redox Behavior ◽  
Acid Base ◽  
Pure Alumina ◽  
Molybdenum Catalyst ◽  
Al2o3 Catalyst ◽  
Dehydrogenation Of Ethanol

The influence of incorporating a small amount of silica on the catalytic performance of MoO3/Al2O3 catalyst was studied. Molybdenum supported on pure alumina and 5% SiO2-Al2O3 supports were synthesized. The catalysts were characterized by XRD, Raman, UV-Vis and IR spectroscopies, FE-SEM microscopy, and their activity was evaluated in the oxidative dehydrogenation of ethanol to acetaldehyde. Molybdenum supported on pure alumina gives a 74% yield to acetaldehyde (at 573 K) due to the generation of oxy-dehydrogenation active sites by molybdenum and to the decrement of the alumina dehydration sites. For the molybdenum catalyst supported on silica-containing alumina, the molybdenum species were displaced from the strongest alumina’s acid-base couples, located on nanoparticles edges, corners and defects, to weaker ones located on plane faces causing the rise of weakly bonded species with less active redox behavior.  

scholarly journals First Principles Micro-kinetic Model of Catalytic Non-oxidative Dehydrogenation of Ethane over Close-packed Metallic Facets

2019 ◽  
Author(s):  
Martin Hangaard Hansen ◽  
Jens K. Nørskov ◽  
Thomas Bligaard
Keyword(s):  
Kinetic Model ◽  
Oxidative Dehydrogenation ◽  
Reaction Network ◽  
Building Blocks ◽  
Light Olefins ◽  
Catalytic Dehydrogenation ◽  
Reaction Conditions ◽  
Model Code ◽  
Ethane Dehydrogenation ◽  
Oxidative Dehydrogenation Of Ethane

<div> <div> <p>Catalytic dehydrogenation of light alkanes may other more efficient routes to selectively producing light olefins, which are some of the most important chemical building blocks in the industry, in terms of scale. We present a descriptor based micro-kinetic model of the trends in selectivity and activity of non-oxidative dehydrogenation of ethane over close-packed metal facets and through varied reaction conditions. Our model predicts and explains the experimentally observed promotion effect on turnover rate from co-feeding hydrogen as an effect of the shifting equilibria in steady state. At low conversion reaction conditions over Pt, the path to ethene goes through ethane dehydrogenation to ethyl, CH 3 CH 2 *, then to ethene while the non-selective pathway to methane and deeply dehydrogenated species is predicted to go through dehydrogenation via CH 3 CH*. This implies that the desorption step of ethene is not the limiting step for selectivity and that geometric effects that stabilize CH 2 CH 2 * compared to CH 3 CH* are desirable properties of a better catalyst. Removing reactive bridge and 3-fold sites facilitates this, which may be achievable by sufficient concentrations of tin in platinum. The included model code furthermore provides a base for easy tuning and for expanding the study to other thermodynamic conditions, other facets, alloys or the reaction network to longer hydrocarbons or to oxidative pathways.</p> </div> </div>

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