On the mechanism of catalyzed isobutane/butene alkylation by zeolites

Feller, Andreas; Guzmán, Alexander; Zuazo, Iker; Lercher, Johannes A.

doi:10.1016/j.jcat.2004.02.019

Cited by 156 publications

(143 citation statements)

References 37 publications

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“…Over the less acidic H-Beta-240 h, the trimer fraction (C 12 -C 14 ) is more abundant while cracking products, i.e. olefins lighter than octenes, are favored over H-Beta-96 h. Our experimental findings are in line with Lercher and coworkers [8] who for large-pore zeolites demonstrated that different acid sites are involved in different reactions: the weak ones catalyze dimerization/oligomerization [9] while the strong sites favor (multiple) cracking and alkylation. It is thus reasonable to assume that strong Brønsted acid sites are predominantly responsible of cracking reactions in the dimerization of 1-butene.…”

Section: Dimerization Of 1-butenesupporting

confidence: 91%

A study on the dimerization of 1-butene over Beta zeolite

et al. 2007

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Section: Dimerization Of 1-butenesupporting

confidence: 91%

A study on the dimerization of 1-butene over Beta zeolite

et al. 2007

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“…[18][19][20] At the same time, zeolites are also good hydrocracking/hydroisomerization catalysts due to its acidic properties. [21] Recently we reported that when a hybrid catalyst of mechanically mixed zeolite and Co/SiO 2 FTS catalyst was used in single or dual step FTS reaction, the formation of short-chain isoparaffins was enhanced while that of longchain hydrocarbons was suppressed. [22][23][24] We designed a new catalyst by coating a zeolite membrane directly onto the surface of FTS Co/SiO 2 pellet termed "capsule catalyst".…”

Section: Introductionmentioning

confidence: 99%

Multiple‐Functional Capsule Catalysts: A Tailor‐Made Confined Reaction Environment for the Direct Synthesis of Middle Isoparaffins from Syngas

Liu

Yoneyama

et al. 2006

Chemistry A European J

122

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A capsule catalyst for isoparaffin synthesis based on Fischer-Tropsch reaction was designed by coating a H-ZSM-5 membrane onto the surface of the pre-shaped Co/SiO(2) pellet. Morphological and chemical analysis showed that the capsule catalyst had a core-shell structure. A compact, integral shell of H-ZSM-5 crystallized firmly on the Co/SiO(2) substrate without crack. Syngas passed through the zeolite membrane to reach the Co/SiO(2) catalyst to be converted, and all hydrocarbons formed with straight chain structure must enter the zeolite channels to undergo hydrocracking as well as isomerization in this tailor-made confined reaction environment. A narrow, anti-Anderson-Schultz-Flory law product distribution was observed on these capsule catalysts. Contrary to a mechanical mixture of H-ZSM-5 and Co/SiO(2), C(10+) hydrocarbons were suppressed completely on this novel capsule catalyst, and the selectivity of middle isoparaffins was considerably improved. The carbon number distribution of the products depended on the thickness of the zeolite membrane, and it was possible to selectively synthesize specified distillates, such as gasoline-range, or heavier hydrocarbons from syngas directly, by simply adjusting the thickness of the zeolite membrane of the capsule catalyst. This kind of capsule catalysts can be extended to various consecutive reaction systems as the shell and core components are independent catalysts for different reactions. At the same time, shape selectivity and space-confined effects can be expected for the reactant, intermediates and product of the sequential reactions.

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“…For this reason, the replacement of both catalysts with relatively safe catalysts continues to be one of the most important research goals for the alkylation of isobutane/C 4 olefins. Some solid acids have been scrutinized for their potential as catalysts in isobutane/butene alkylation [2][3][4][5]. The major drawback, however, evidenced in all evaluations of solid acid catalysts for alkylation is their rapid deactivation from coking.…”

Section: Introductionmentioning

confidence: 99%