Oxidative dehydrogenation of ethane to ethylene over phase-pure M1 MoVNbTeOx catalysts in a micro-channel reactor

2015 ◽  
Vol 5 (5) ◽  
pp. 2807-2813 ◽  
Author(s):  
Bozhao Chu ◽  
Lara Truter ◽  
Tjeerd Alexander Nijhuis ◽  
Yi Cheng
Keyword(s):  
Heat Transfer ◽  
Oxidative Dehydrogenation ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Micro Channel ◽  
Channel Reactor ◽  
Reaction Conditions ◽  
Oxidative Dehydrogenation Of Ethane ◽  
Phase Pure

Due to its excellent heat transfer ability, the micro-channel reactor with coated phase-pure M1 catalysts can achieve reactor productivity nearly 5 times higher than that of a traditional fixed-bed reactor under the same reaction conditions in oxidative dehydrogenation of ethane (ODHE).

CFD Study of Heat Transfer near and at the Wall of a Fixed Bed Reactor Tube:  Effect of Wall Conduction

2005 ◽  
Vol 44 (16) ◽  
pp. 6342-6353 ◽  
Author(s):  
Anthony G. Dixon ◽  
Michiel Nijemeisland ◽  
E. Hugh Stitt
Keyword(s):  
Heat Transfer ◽  
Fixed Bed ◽  
Fixed Bed Reactor

Investigation of radial heat transfer in a fixed-bed reactor: CFD simulations and profile measurements

2017 ◽  
Vol 317 ◽  
pp. 204-214 ◽  
Author(s):  
Ying Dong ◽  
Bahne Sosna ◽  
Oliver Korup ◽  
Frank Rosowski ◽  
Raimund Horn
Keyword(s):  
Heat Transfer ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Cfd Simulations ◽  
Radial Heat

Effect of Different Reaction Conditions on the Deactivation of Alumina-Supported Cobalt Fischer–Tropsch Catalysts in a Milli-Fixed-Bed Reactor: Experiments and Modeling

2014 ◽  
Vol 53 (17) ◽  
pp. 6913-6922 ◽  
Author(s):  
Majid Sadeqzadeh ◽  
Stéphane Chambrey ◽  
Jingping Hong ◽  
Pascal Fongarland ◽  
Francis Luck ◽  
...  
Keyword(s):  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Fischer Tropsch ◽  
Reaction Conditions

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>

A Study of the Heating Section of a Gas Heated Steam Reformer

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Margrete H. Wesenberg ◽  
Jochen Ströhle ◽  
Hallvard F Svendsen
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Fixed Bed ◽  
Two Dimensions ◽  
Fixed Bed Reactor ◽  
Discrete Ordinates ◽  
Temperature Profiles ◽  
Radial Temperature ◽  
Steam Reformer ◽  
Heating Section

A gas heated steam reformer (GHR) which converts natural gas to synthesis gas for methanol or Fischer-Tropsch purposes has been modelled for steady state conditions. The model is in two dimensions and is made up of a fixed bed reactor model, representing one of the reactor tubes in the GHR, and an annulus model, representing the annular space on the shell side of the GHR where hot, fully converted syngas emits heat to the reactor tube. The annulus model is described and evaluated in this article. This is a plug flow model which involves heat transfer in radial direction caused by radiation and by turbulence. The gas radiation is modelled by the use of the discrete ordinates method and the effect on heat transfer from turbulence is modelled as an effective radial thermal conductivity. Both heat transfer mechanisms vary with the radial position. An additional annulus model, made in the commercial CFD code FLUENT and based on the k-? turbulence model and the discrete ordinates radiation model, is used to estimate effective radial thermal conductivities. These were implemented in the annulus model of the GHR model. The reactor and the annulus models were combined and linked by the wall temperature profile and the heat flux profile on the outer reactor tube wall. The simulation results were used to study the heat flux and temperature profiles along the reactor length and the radial temperature profiles in the annulus.

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