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Accessibility in alumina matrices of FCC catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43839 45991 2006 6 PDF Available
Title
Accessibility in alumina matrices of FCC catalysts
Abstract

The accessibility in aluminas considered to be representative of matrices used in FCC resid catalysts, with mean pore sizes between 64 and 201 Å, was characterized through a kinetic approach by means of the conversion of 1,3,5-tri-isopropylbenzene (TIPB) at 500 °C in a CREC Riser Simulator fluidized bed laboratory reactor. The product distribution was essentially the same as that observed on an equilibrium commercial FCC catalyst, but the activity of the aluminas was much lower. The main products (propylene, benzene, isopropylbenzene, di-isopropylbenzenes) showed that a series cracking mechanism prevailed in the conversion of TIPB. The apparent first order kinetic constants assessed and the conversion profiles allowed establishing a ranking of activities that could be associated directly to accessibilities and not to the number of acid sites (Lewis nature), which was proportional to the specific surface area of the alumina. The sequence of accessibilities followed the same trend as the mean pore size of the aluminas.

Graphical abstractA kinetic approach on the conversion of tri-isopropylbenzene at 500 °C characterized accessibility in FCC resid catalyst alumina matrices with mean pore sizes between 64 and 201 Å. The apparent first order kinetic constants and the conversion profiles defined a ranking of activities associated to accessibilities, that followed the same trend as the mean pore size of the aluminas. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Accessibility; Catalytic cracking; Matrix; Resid; Alumina
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Accessibility in alumina matrices of FCC catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 315, 23 November 2006, Pages 29–34
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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