Reverse Molecular-Size Selectivity and Aging in Zeolite-Catalyzed Alkylation

Venuto, P.B.; Hamilton, Lyle A.

doi:10.1021/i360023a011

Cited by 46 publications

(12 citation statements)

References 6 publications

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“…Similar results on the structure of coke were obtained by Venuto and Hamilton [32]. In the reaction of 1-butene on calcined NaNH4-Y it was concluded that the coke precursors possessed cyclic structures [33].…”

supporting

confidence: 83%

Catalytic isomerization of 1‐hexene on hy zeolite

Wojciechowski

1983

Int J of Chemical Kinetics

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The isomerization of 1-hexene on 70/80 mesh HY zeolite was studied at 200OC. The observed reaction products are formed via a variety of processes including double bond shift, cis-trans isomerization, skeletal rearrangement, cracking, hydrogen transfer, polymerization, cyclization, and coke formation. By applying the time-on-stream theory, the products have been classified as primary, secondary, or both, according to their OPE curves on product selectivity plots. 2-Ethyl-l-butene, which is present as an impurity in the feed, is found to react about 30 times faster than 1-hexene. Both 2-hexenes and 3-hexenes are formed primarily from 1-hexene, while 3-methyl-2-pentenes and 3-methyl-1-pentene formed from 2-ethyl-1-butene. The ratio of the initial rate of deprotonation to that of hydrogen shift in these reactions is -15 and -100, respectively. All products of skeletal rearrangement are observed to be secondary. Cracking products are produced mainly from precoke, which is also the source of hydrogen in the formation of paraffins. A detailed reaction network along with its associated mechanisms are presented and discussed. Abbreviations to be Used 1 -hexene cis-or trans-2-hexene (cis + trans)-3-hexene n -hexane 2-ethyl-1 -butene 3-methyl-1-pentene cis-or trans-3-methyl-2-pentene 3-methylpentane cis-or trans-4-methyl-2-pentene 2-methyl-1 -pentene

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confidence: 83%

Catalytic isomerization of 1‐hexene on hy zeolite

Wojciechowski

1983

Int J of Chemical Kinetics

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“…At high WHSV, the contact time for reactants and catalyst improves the complete adsorption-desorption equilibrium for isobutene molecules over the active sites of the catalyst. This behavior is consistent with the findings reported in other works, in which high selectivity for the dimer was reported [19,20].…”

Section: Resultssupporting

confidence: 93%

Oligomerization of isobutene on sulfated titania: Effect of reaction conditions on selectivity

et al. 2005

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“…The details of such reactions as illustrated in Figure 1 are now understood in terms of classical carbenium ion chemistry (Jacobs, 1977;Gates et al, 1979). Venuto and Hamilton (1967) were the first to report the trapping of large molecules within the internal cages of faujasite during the ethylation of benzene. These large-pore zeolites have channel apertures on the order of 10 A (1.0 nm).…”

Section: Reaction Of Methanol To Hydrocarbonsmentioning

confidence: 99%

The role of zeolite pore structure during deactivation by coking

McLaughlin

Anthony

1985

AIChE Journal

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extraction, are composed of a series of aromatics up to a distinct cutoff at pyrene. Similar analysis of partially-regenerated catalyst reveal pathways by which residue oxidation can occur and pathways by which these residues can participate during ~i~~ti,.., Catalysis and Reaction ~~ methanol decomposition.Laboratories Department of Chemical Engineering Texas A&M University College Station, TX 77843During the 1970s in the United States, concern over dependence on foreign oil resulted in heightened activity in the investigation of alternative hydrocarbon sources. Due to the potential availability of methanol from coal, the catalytic conversion of methanol into fuels and chemical feedstocks appeared to provide an attractive route for utilizing this country's coal resources.The use of a small-pore zeolite such as chabazite during methanol decomposition can provide high selectivity toward ethylene and propylene at high rates of conversion per reactor pass; unfortunately, chabazite employed in this reaction quickly deactivates via coking, The objective of this study was to uncover the reaction pathway leading to these coke residues.The formation of coke was quantified by determining the coke content of spent catalyst samples via weight loss upon combustion, Correlations of coke formation based on this adopted burnoff method provided clues to the origins of coke and to the factors that influence its formation.

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Reverse Molecular-Size Selectivity and Aging in Zeolite-Catalyzed Alkylation

Cited by 46 publications

References 6 publications

Catalytic isomerization of 1‐hexene on hy zeolite

Catalytic isomerization of 1‐hexene on hy zeolite

Oligomerization of isobutene on sulfated titania: Effect of reaction conditions on selectivity

The role of zeolite pore structure during deactivation by coking

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