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Full-Text Articles in Environmental Chemistry
Modelling Of The Adsorption‐Catalytic Processes In The Multi‐Dispersed Bed, Sergey V. Zazhigalov, Natali A. Chumakova, Andrey N. Zagoruiko
Modelling Of The Adsorption‐Catalytic Processes In The Multi‐Dispersed Bed, Sergey V. Zazhigalov, Natali A. Chumakova, Andrey N. Zagoruiko
Andrey N Zagoruiko
The simulation work is dedicated to the multidispersed adsorption-catalytic packing, consisting of comparatively large pellets (say, 5-10 mm) of the catalyst-adsorbent and of catalytically active micro-fibers with typical thickness of ~10 microns. During the heating at the regeneration stage the micro-fiber catalyst must be heated much more rapidly than adsorbent-catalyst, due to the much higher unit outer surface area improving the heat exchange. When the adsorbent-catalyst temperature is becoming high enough for partial desorption of chemisorbed VOC, the temperature of the micro-fibrous catalyst will be already as high as necessary one for complete oxidation of desorbed VOCs. This theoretical concept …
New Developments In The Area Of Nonstationary And Sorption-Enhanced Catalytic Processes, Andrey N. Zagoruiko
New Developments In The Area Of Nonstationary And Sorption-Enhanced Catalytic Processes, Andrey N. Zagoruiko
Andrey N Zagoruiko
The presentation is dedicated to catalytic processes performed under artificially created catalyst nonstationarity. It is shown that the highest technological effect can be achieved for a controlled combination of the thermal nonstationarity with the composition nonstationarity of the catalyst surface. Prospective for application of unsteady catalytic and sorption-catalytic processes are analyzed for different case applications: VOC incineration, hydrogen production by steam conversion of hydrocarbons and organic feedsctock, selective anaerobic oxidation of hydrocarbons. In general, unsteady state and sorption-catalytic ideology discovers new degrees of freedom for process development and may become the basement for new generation of highly-efficient catalytic technologies in …
Sorption-Enhanced Steam Reforming Of Hydrocarbons With Autothermal Sorbent Regeneration In A Moving Heat Wave Of Catalytic Combustion Reaction, Andrey N. Zagoruiko, Alexey G. Okunev
Sorption-Enhanced Steam Reforming Of Hydrocarbons With Autothermal Sorbent Regeneration In A Moving Heat Wave Of Catalytic Combustion Reaction, Andrey N. Zagoruiko, Alexey G. Okunev
Andrey N Zagoruiko
Novel technological concept of sorption-enhanced hydrocarbon steam reforming with autothermal regeneration of the carbon dioxide scavenger in the moving super-adiabatic heat wave of the exothermic catalytic combustion reaction performed directly inside the adsorption-catalytic bed is presented. Process modelling results, confirming the capability and high efficiency of the proposed technological approach, are discussed. It is shown that proposed approach opens the way for creation of cheap, reliable and energy-saving adiabatic packed bed methane processors of unlimited processing capacity.
Anaerobic Catalytic Oxidation Of Hydrocarbons In Moving Heat Waves. Case Simulation: Propane Oxidative Dehydrogenation In A Packed Adiabatic V-Ti Oxide Catalyst Bed, Andrey N. Zagoruiko
Anaerobic Catalytic Oxidation Of Hydrocarbons In Moving Heat Waves. Case Simulation: Propane Oxidative Dehydrogenation In A Packed Adiabatic V-Ti Oxide Catalyst Bed, Andrey N. Zagoruiko
Andrey N Zagoruiko
The model simulation study has shown that the anaerobic process of oxidative dehydrogenation of propane under periodic alteration of feeding between propane and air may be realized in adiabatic catalyst beds in stable continuous cyclic mode in two-reactor scheme. In case of appropriate choice of process parameters (cycle duration, feeding flow rates) the process appears to be autothermal, i.e. it does not require any inlet gas preheating for stable operation. Compared to similar steady-state adiabatic process, the proposed process is characterized with much lower maximum catalyst temperatures, giving the way to process pure propane without diluting it with inert gases, …
Non-Steady-State Approach #11;To Steady-State Kinetics: #11;Case Study Of H2s Oxidation By Oxygen, Andrey N. Zagoruiko, Vladimir V. Mokrinskii
Non-Steady-State Approach #11;To Steady-State Kinetics: #11;Case Study Of H2s Oxidation By Oxygen, Andrey N. Zagoruiko, Vladimir V. Mokrinskii
Andrey N Zagoruiko
Non-steady-state kinetic models may be used for treatment of steady-state kinetic data in case when algebraic elaboration of steady-state kinetic equations is impossible or complicated. The proposed approach includes numerical integration of time-dependent differential equations until achievement of steady-state, resulting in possibility to numerically obtain the rate values for separate reaction stages for given composition of reaction mixture. The obtained non-steady-state model may be then applied in simulation of catalyst pellets and catalyst beds in research and engineering purposes. The case study demonstrates application of such approach for steady-state kinetic description of complicated reaction system of H2S oxidation by oxygen. …