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Catalyst attrition in an ASTM fluidized bed

Paper ID Volume ID Publish Year Pages File Format Full-Text
53298 46962 2016 5 PDF Available
Title
Catalyst attrition in an ASTM fluidized bed
Abstract

•A model is derived and confirmed to represent the measured total attrition rate.•A simple regression analysis is used to separate total attrition into two sources.•Contribution of jet attrition increases rapidly with increasing the gas velocity.

Catalyst attrition is a major issue for the reliable and efficient performance of a fluidized-bed reactor. In this study, attrition behavior of a commercial FCC catalyst is examined in a laboratory-scale ASTM fluidized bed. An attrition rate model that combines the jet attrition and bubble-induced attrition is derived and confirmed to represent the measured total attrition rate versus the superficial gas velocity. The model parameters systematically vary with time, since the properties of the attrited particles change progressively. It is also shown that the minimum bubble attrition velocity is far larger than the minimum fluidizing velocity because energy is required to produce attrition. Furthermore, jet and bubble attritions are separated and their contributions are discussed. The contribution of jet attrition increases rapidly with increasing the gas velocity, and the fast increase in the jet attrition rate is the major cause of the increasingly serious catalyst attrition with increasing the gas velocity. It is also seen that regression analysis is an effective tool to the separation of attrition sources.

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Keywords
Fluid catalytic cracking; Fluidized bed; FCC catalyst; Particle attrition; Attrition rate; Attrition source
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 264, 15 April 2016, Pages 70–74
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us