Results 151 to 160 of about 160,248 (216)

Performance Analysis of Silica Fluidized Bed Membrane Reactor for Hydrogen Production as a Green Process Using CFD Modelling. [PDF]

Membranes (Basel)
Barmaki M, Jalilnejad E, Ghasemzadeh K, Iulianelli A.   +3 more
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Catalyst bed dilution for improving catalyst wetting in laboratory trickle‐bed reactors

AIChE Journal, 1996
AbstractThe catalyst bed dilution technique has found rather widespread applications as a means of producing reliable and reproducible results for successful scale‐up and scale‐down when testing commercially used catalyst particle sizes and alternative feedstocks in small‐scale laboratory trickle‐bed reactors.
Muthanna H. Al‐Dahhan, Milorad P. Duduković   +1 more
openaire   +1 more source

Catalyst attrition in fluidized‐bed systems

AIChE Journal, 1999
AbstractCatalyst attrition has often been a major obstacle in the development of new fluidized‐bed processes and it is still of concern for existing processes whenever the catalyst is changed. The main consequence of attrition is the generation of fines and the resulting loss of valuable material.
J. Werther, J. Reppenhagen
openaire   +1 more source

Sulfiding of nickel catalyst beds

Journal of Catalysis, 1971
Abstract A moving coil permeameter has been used to confirm that sulfided nickel catalyst beds obey the Bohart-Adams poisoning wave equation. Poisoning by H2S at low velocities ( 300 °C); CS2 and (C2H5)2S are mass transfer controlled up to 300 °C. Thiophene is adsorption limited.
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Catalyst performance testing: bed dilution revisited

Chemical Engineering Science, 2002
Abstract A study was performed to investigate the systematic (negative) deviation of the conversion caused by dilution of the catalyst bed with inert particles in gas–solid systems for an irreversible first order reaction. Dilution may significantly reduce the conversion due to local bypass effects.
Rob J. Berger, Javier Pérez-Ramı́rez, Freek Kapteijn, Jacob A. Moulijn   +3 more
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Laboratory Evaluation of Cracking Catalysts in a Fluid Bed:  Effects of Bed Dynamics and Catalyst Deactivation

Industrial & Engineering Chemistry Research, 2003
Testing of fluid cracking catalysts in laboratory microactivity units is carried out in either fixed- or fluid-bed reactors. The latter are becoming increasingly popular because of the automation they provide. This paper focuses on understanding the effects of testing protocols on product selectivities in such reactors and explains the cause of ...
C. P. Kelkar, Mingting Xu, Rostam J. Madon   +2 more
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Optimal catalyst activity distribution in fixed-bed reactor with catalyst deactivation

Collection of Czechoslovak Chemical Communications, 1989
In this paper the influence of the active catalyst location in a pellet on fixed-bed catalytic reactor performance is described. The optimal activity distribution as a function of an economic parameter (ratio of product and catalyst costs), Thiele modulus and Damkohler number is estimated.
Jozef Markoš, Alena Brunovská
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Optimal catalyst pellet activity distributions—fixed-bed reactor with catalyst deactivation

Computers & Chemical Engineering, 1990
Abstract The catalyst pellet activity distribution to maximize fixed-bed reactor performance (profit per time) is determined for first-order, second-order and consecutive first-order reactions in the presence of deactivation. An isothermal heterogeneous plug-flow reactor packed with multiple zones of narrow active region catalysts is considered.
J. Markoš, A. Brunovská, Z. Letková
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Catalyst wetting characteristics in trickle‐bed reactors

AIChE Journal, 2003
AbstractA model for external wetting efficiency of the catalyst in trickle‐bed reactors was developed based on 1‐D force‐balance equations incorporating drag forces in a three‐phase system. The gas–liquid interfacial drag was considered, as well as the tortuosity effect.
Arunabha Kundu, K. D. P. Nigam, R. P. Verma   +2 more
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