The extent of diffusion limitations in the catalytic conversion of synthesis gas to hydrocarbons by the Fischer-Tropsch reaction has been established for a number of iron-and cobalt-based catalysts. The studies were performed in a fixed-bed microreactor system at temperatures in the range 473-523 K. Variation of catalyst particle size in the range 0.2-2.6 mm shows that the conversion of synthesis gas decreases considerably when the average particle size is increased. The effects of variation of particle size and pore diameter have been quantified with the Thiele model for diffusion limitations. Evidence has accumulated that the limited mobility of reactant molecules in the liquid-filled pores of Fischer-Tropsch catalysts is the main cause of retardation of the reaction rates. The experimentally determined reaction rates with various catalysts operated under different conditions show an excellent fit with the theoretical model.
The sections in this article are
Introduction
Hydrocracking
Processes and Process Configurations
Two‐Stage Hydrocracking
Single‐Stage Hydrocracking
Alternative Process Schemes
Mild Hydrocracking
Reactor Design Aspects
Feedstocks
Products
Catalyst Systems
HC
Catalyst Design Rules
Coke Deactivation
Zeolite‐Based Catalysts
Effect of Recycle Operation
New Catalyst Developments
Ring Opening
Catalytic Dewaxing
Commercial Developments
Shape‐Selective Catalysis
Dewaxing Catalysts
Reaction Pathway
Process Line‐Ups
Cracking Dewaxing
Isomerization Dewaxing
Future Trends in Catalytic Dewaxing—the Gas to Liquid Route
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