ISSN:
1573-4854
Keywords:
porous materials
;
supported catalyst
;
coked catalyst
;
distribution of modifier
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Morphology and local distribution of coke is studied in γ-Al2O3 biporous granules coked with mixture of propane and butane under kinetic and diffusion regimes. Under kinetic regime atT 〈 923 K, coke is shown to distribute as a viscous-plastic phase that wets the catalyst surface. At low coke content, coke is localized at the sites of contact between the catalyst initial particles. At high coke content the coke deposits over the free areas with the surface negative curvature. The degree of surface coverage with coke increases as the coke content grows from a “mosaic” (consisting of the patches covered and noncovered with coke) to full coverage. Under diffusion regime atT 〉 923 K, coke precipitates mainly on the surface of aggregates of the catalyst initial particles. The models and analytical relations are suggested for the analysis of coke distribution.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01135358
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