Deactivation of dealuminated zeolite Y in the catalytic cracking of n-hexane

Hammon, Ulrich; Kokotailo, G.T.; Riekert, L.; Zhou, Junqiang

doi:10.1016/s0144-2449(88)80133-7

Cited by 17 publications

(3 citation statements)

References 5 publications

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“…The rate constant of n-hexane cracking k was defined for a first order reaction according to [10]. The rate of zeolite deactivation was evaluated from the ratio of k~ to initial n-hexane cracking rate k0 as a function of reaction time.…”

Section: Methodsmentioning

confidence: 99%

Contribution of particle size and aluminium distribution to the para-selectivity of ZSM-5 type zeolites

Paciga

Smiešková

Hudec

et al. 1997

React Kinet Catal Lett

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Section: Methodsmentioning

confidence: 99%

Contribution of particle size and aluminium distribution to the para-selectivity of ZSM-5 type zeolites

Paciga

Smiešková

Hudec

et al. 1997

React Kinet Catal Lett

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“…Increasing the lifetime of the catalyst by just 10-20% could increase a company's revenues by hundreds of millions of dollars [66]. In reactions involving zeolites, carbonaceous materials are produced from the undesired interaction of the reaction feeds or the catalyzed side reactions [67][68][69][70][71]. The hydrogen-rich coking species can attack key active sites at the zeolite surfaces with a net consequence of catalyst deactivation.…”

Section: Catalyst Deactivation In Fast Pyrolysismentioning

confidence: 99%

In situ fast pyrolysis of biomass with zeolite catalysts for bioaromatics/gasoline production: A review

Galadima

Muraza

2015

Energy Conversion and Management

223

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“…The mode of coke deposition is closely related to the pore structure of the zeolite (5)(6)(7)(8). Figure 1 shows how coke deposits on typical zeolites.…”

Section: Deactivation Of Zeolite Catalysts By Coke 63mentioning

confidence: 99%

Deactivation of Zeolite Catalysts by Coke

Masuda

Hashimoto

1996

ACS Symposium Series

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Zeolite catalysts are widely used in conversion processes of hydrocarbons, because of their high activity and shape selectivity. The conversion rate and the shape selectivity are closely related to intracrystalline diffusion rate and acidic properties of the zeolite catalyst. Carbonaceous materials called coke deposit on the catalyst during reactions, leading to changes in catalytic properties (diffusivity and acidic properties) as well as the reaction performance. This presentation reviews the mechanisms of the deactivation of zeolite catalysts caused by coke deposition from the following points of view. (1) Characterization of coke. Examination of the location of coke formation. (2) Relationship between the changes in acidic properties, and the acid strength and the acid amount. Prediction of the reduction of diffusion rate taking account of pore structure and molecular size. (3) Development of models for predicting the change in the activity and the shape selectivity.Zeolites are solid acid catalysts which are widely used in hydrocarbon processing, such as naphtha cracking, isomerization, dispropornation and alkylation. During reactions carbonaceous materials called coke deposit on the zeolite and reduces its activity and selectivity. Coke deposited not only covers the acid sites of the catalyst, but also blocks the pores, and restrain reactants from reaching the acid sites, leading to the decrease in the apparent reaction rate (1, 2). Here, we will mainly deal with the intracrystalline diffusivity of zeolites, and will discuss the relationship between it and the change in catalyst selectivity. THE PORE STRUCTURES OF ZEOLITES AND THE MODES OF COKE DEPOSITIONZeolites are composed of crystals of alumino silicate with the size of 0.1-5 micron. The pores of HY type zeolites consist of super cages and windows (0.74 nm). ZSM-

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Deactivation of dealuminated zeolite Y in the catalytic cracking of n-hexane

Cited by 17 publications

References 5 publications

Contribution of particle size and aluminium distribution to the para-selectivity of ZSM-5 type zeolites

Contribution of particle size and aluminium distribution to the para-selectivity of ZSM-5 type zeolites

In situ fast pyrolysis of biomass with zeolite catalysts for bioaromatics/gasoline production: A review

Deactivation of Zeolite Catalysts by Coke

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