scholarly journals Hydrogenation of CO/CO2 mixtures under unsteady-state conditions: Effect of the carbon oxides on the dynamic methanation process

2021 ◽  
Author(s):  
Dominik Meyer ◽  
Jens Friedland ◽  
Jannik Schumacher ◽  
Max Gäßler ◽  
Robert Güttel
Keyword(s):  
Fixed Bed ◽  
Point Sources ◽  
Unsteady State ◽  
Reactor Model ◽  
Reaction Conditions ◽  
Carbon Oxides ◽  
Feed Composition ◽  
Power To Gas ◽  
Potential Carbon ◽  
Hydrogenation Of Co

The Power-to-Gas (PtG) process offers the opportunity to store fluctuating renewable energy in form of chemical energy by hydrogenating carbon oxides into methane. In addition, potential carbon point sources often consist of CO/CO2 (COx) mixtures. Hence, reactor design requires kinetic models valid for unsteady-state operation and a broad spectrum of feed gas compositions. In order to provide the required experimental data basis for derivation of kinetic expressions valid under transient conditions, the dynamic response of a continuously operated fixed-bed methanation reactor is studied by applying periodic step-changes in the feed composition. The obtained results are evaluated based on a simple reactor model, providing the molar flow rate exchanged between the gas bulk and the solid surface for CO, CO2, CH4, and H2O. The results further reveal that the transient kinetic processes at the catalyst surface strongly affect the reactor response under reaction conditions of technical relevance.

Application of an Isothermal, Three-Phase Catalytic Reactor Model To Predict Unsteady-State Fixed-Bed Performance

2003 ◽  
Vol 37 (2) ◽  
pp. 428-436 ◽  
Author(s):  
Ji Yang ◽  
David W. Hand ◽  
David R. Hokanson ◽  
John C. Crittenden
Keyword(s):  
Fixed Bed ◽  
Catalytic Reactor ◽  
Unsteady State ◽  
Reactor Model ◽  
Three Phase

scholarly journals Dehydration of 2,3-Butanediol to 1,3-Butadiene and Methyl Ethyl Ketone: Modeling, Numerical Analysis and Validation Using Pilot-Scale Reactor Data

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 999
Author(s):  
Daesung Song ◽  
Sung-Yong Cho ◽  
Toan-Thang Vu ◽  
Hoang-Phi-Yen Duong ◽  
Eunkyu Kim
Keyword(s):  
Numerical Analysis ◽  
Fixed Bed ◽  
Pilot Scale ◽  
Fixed Bed Reactor ◽  
Sensitivity Analyses ◽  
Inlet Temperature ◽  
Reactor Model ◽  
Feed Composition ◽  
Efficient Operation ◽  
Operation Conditions

This work presents the numerical analysis and validation of a fixed bed reactor model for 2,3-butanediol (2,3-BDO) dehydration. The 1D heterogeneous reactor model considering interfacial and intra-particle gradients, was simulated and numerical analysis of the model was conducted to understand the characteristics of the reactions in a catalyst along the reactor length. The model was also validated by comparing predicted performance data with pilot-scale plant data operated at 0.2 bar, 299–343 °C and 0.48–2.02 h−1 of weight hourly space velocity (WHSV). The model showed good agreement with the temperature profile, 2,3-BDO conversion and selectivity of target products. In addition, sensitivity analyses of the model were investigated by changing feed flow rate, feed composition, and inlet temperature. It was found that stable and efficient operation conditions are lower than 0.65 h−1 of WHSV and 330–340 °C of inlet temperature. Additionally, the reactor performance was not affected by 2,3-BDO feed concentration above 70%.

Hydrogenation of CO/CO2 mixtures under unsteady-state conditions: Effect of the carbon oxides on the dynamic methanation process

2021 ◽  
pp. 117405
Author(s):  
Dominik Meyer ◽  
Jens Friedland ◽  
Jannik Schumacher ◽  
Max G. Gäßler ◽  
Robert Güttel
Keyword(s):  
Unsteady State ◽  
Carbon Oxides ◽  
Hydrogenation Of Co

Dynamic Modeling of CATOFIN® Fixed-Bed Iso-Butane Dehydrogenation Reactor for Operational Optimization

2016 ◽  
Vol 14 (1) ◽  
pp. 491-515 ◽  
Author(s):  
Zeeshan Nawaz
Keyword(s):  
Coke Formation ◽  
Fixed Bed ◽  
Process Intensification ◽  
Operating Conditions ◽  
Catalytic Dehydrogenation ◽  
Heating Rates ◽  
Reactor Model ◽  
Fuel Gas ◽  
Bed Temperature ◽  
Operational Optimization

AbstractThe catalytic dehydrogenation of iso-butane to iso-butylene is an equilibrium limited endothermic reaction and requires high temperature. The catalyst deactivates quickly, due to deposition of carbonaceous species and countered by periodic regeneration. The reaction-engineering constraints are tied up with operation and/or technology design features. CATOFIN® is a sophisticated commercialized technology for propane/iso-butane dehydrogenation using multiple adiabatic fixed-bed reactors having Cr2O3/Al2O3 as catalyst, that undergo cyclic operations (~18–30m); dehydrogenation, regeneration, evacuation, purging and reduction. It is always a concern, how to maintain CATOFIN® reactor at an optimum production, while overcoming gradual decrease of heat in catalyst bed and deactivation. A homogeneous one-dimensional dynamic reactor model for a commercial CATOFIN® fixed-bed iso-butane dehydrogenation reactor is developed in an equation oriented (EO) platform Aspen Custom Modeler (ACM), for operational optimization and process intensification. Both reaction and regeneration steps were modeled and results were validated. The model predicts the dynamic behavior and demonstrates the extent of catalyst utilization with operating conditions and time, coke formation and removal, etc. The model computes optimum catalyst bed temperature profiles, feed rate, pre-heating, rates for reaction and regeneration, fuel gas requirement, optimum catalyst amount, overall cycle time optimization, and suggest best operational philosophy.

scholarly journals Investigation of Copper-supported Ceria Nanofibers for Catalytic Oxidation of Diesel Soot

2021 ◽  
Author(s):  
Dan Bahadur Pal ◽  
Anupama Mishra
Keyword(s):  
Photoelectron Spectroscopy ◽  
Fixed Bed ◽  
Tubular Reactor ◽  
Soot Oxidation ◽  
Diesel Soot ◽  
Air Flow Rate ◽  
Reaction Conditions ◽  
Tight Contact ◽  
Diesel Soot Oxidation ◽  
Working Parameters

Abstract In the present research, CeO2 and CuO/CeO2 nanofibers were synthesized by electrospinning at 12 kV DC by maintaining a tip to collector distance of 10 cm. The morphology of the as-synthesized nanofibers was determined by scanning electron microscopy, and their elemental composition was verified by X-ray photoelectron spectroscopy. The activity of the prepared samples for diesel soot oxidation was determined in a bench-scale fixed bed tubular reactor, and effluent gases were analyzed by online gas chromatography. The variations of working parameters (air flow rate, catalyst-soot ratio, catalyst-soot contact type) were evaluated in a range to optimized reaction conditions for diesel soot oxidation. The catalyst with 40% CuO/CeO2 had the highest surface area, the smallest crystallite size, and the best activity for diesel soot oxidation (tight contact) at Tf = 318oC.

scholarly journals Liquid phase hydrogenation of CO2 to formate using palladium and ruthenium nanoparticles supported on molybdenum carbide

2019 ◽  
Vol 43 (35) ◽  
pp. 13985-13997 ◽  
Author(s):  
Claire E. Mitchell ◽  
Umberto Terranova ◽  
Ihfaf Alshibane ◽  
David J. Morgan ◽  
Thomas E. Davies ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Palladium Nanoparticles ◽  
Molybdenum Carbide ◽  
Active Catalyst ◽  
Ruthenium Nanoparticles ◽  
Reaction Conditions ◽  
Hydrogenation Of Co2 ◽  
Liquid Phase Hydrogenation ◽  
Hydrogenation Of Co

We report the development of palladium nanoparticles supported on Mo2C as an active catalyst for the liquid-phase hydrogenation of CO2 to formate under mild reaction conditions (100 °C and 2.0 MPa of a 1 : 1 CO2 : H2 mixture).

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

Impregnated Molecular Sieves as a Catalyst for the Isopropylation of Naphthalene

2013 ◽  
Vol 329 ◽  
pp. 45-50 ◽  
Author(s):  
Xin Zhang ◽  
Xi Dong Liu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Molecular Sieves ◽  
Catalytic Properties ◽  
Fixed Bed ◽  
Optimum Conditions ◽  
Reaction Conditions ◽  
Energy Dispersion Spectrometer ◽  
Micro Reactor ◽  
Scanning Electron

At refluence temperature, ferric chloride impregnated molecular sieves were prepared by impregnation of FeCl3 through ion-exchanging methods. The above catalysts were characterized by the means of SEM/EDS (scanning electron microscope/energy dispersion spectrometer) and BET. The catalytic properties on isopropylation of naphthalene and effect of reaction conditions were carried out with fixed-bed flow micro-reactor. We obtained the optimum conditions of this reaction. At this condition, the conversion of naphthalene reaches 44.1%, the yield of 2, 6-DIPN is 41.2% and the selectivity of β,β-DIPN is 85.2%.

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