Evaluation of modes of catalyst deactivation by coking for cumene cracking over zeolites

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1102· OSTI ID:6130880

Bellare, A; Dadyburjor, D B ^[1]

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1. West Virginia Univ., Morgantown (United States)

The deposition of coke deactivates a catalyst by the suppression of active sites and/or by choking of pores. The so-called Constant-Coke Arrhenius Plot technique can assess the magnitudes of these two modes of deactivation using reaction experiments under process conditions. For cumene cracking over REY zeolite, a TGA has been used as a continuous-flow microreactor to monitor coke levels, with activity measured by an on-line GC. Using modifications described previously for small-pore catalysts, the authors show that both temperature and coke level influence the relative importance of site suppression and pore choking in the deactivation of the zeolite. At relatively high temperatures, site suppression is predominant at all coke levels studied here. At lower temperatures, pore choking is more important at low levels of coke, with site suppression increasing in importance at the higher coke levels. The results are consistent with a physical model developed. 21 refs., 12 figs.

• OSTI ID: 6130880
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 140:2; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AROMATICS
ARRHENIUS EQUATION
CARBONIZATION
CATALYSIS
CATALYSTS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHROMATOGRAPHY
COKE
COKING
CRACKING
CUMENE
DEACTIVATION
DECOMPOSITION
DEPOSITION
EQUATIONS
GAS CHROMATOGRAPHY
GRAVIMETRIC ANALYSIS
HETEROGENEOUS CATALYSIS
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERALS
MODIFICATIONS
ORGANIC COMPOUNDS
PYROLYSIS
QUANTITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
SILICATE MINERALS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMOCHEMICAL PROCESSES
ZEOLITES