Isomerization and Cracking of Hexane over Beta Zeolites Synthesized by Dry Gel Conversion Method

Pusparatu,; Haga, Yuji; Aoyama, Kiyotada; Komura, Kenichi; Kubota, Yoshihiro; Nishimura, Yoichi; Sugi, Yoshihiro

doi:10.1627/jpi.55.120

Cited by 3 publications

(4 citation statements)

References 21 publications

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“…This is confirmed by the remarkable increase in the yield of olefins by the addition of *BEA386 zeolite, even though it contains very few acid sites on the outer shells of the particle. In addition, the isomerization of the olefins transferred from the FAU zeolites to the *BEA zeolites proceeds on the *BEA zeolites with high Si/Al ratios and the multi-branched olefins are produced (R17a, R20a) [14]. These multi-branched olefins are transferred into the FAU zeolites again (R21a) and converted to the multi-branched paraffins via hydrogen transfer reaction (R14).…”

Section: Reaction Mechanism On the Composite Catalystmentioning

confidence: 99%

“…Recently, the FCC reaction activity of *BEA zeolites have been investigated [13][14][15][16][17]. *BEA zeolites have a large pore size with a 12-ring of oxygen atoms, and they show catalytic activity for the cracking and isomerization of paraffins, while they are not so active for hydrogen transfer reactions [13].…”

Section: Introductionmentioning

confidence: 99%

“…*BEA zeolites have a large pore size with a 12-ring of oxygen atoms, and they show catalytic activity for the cracking and isomerization of paraffins, while they are not so active for hydrogen transfer reactions [13]. Pusparatu et al [14] observed the enhancement of the ratio of isomerization to cracking by increasing Si/Al ratios of *BEA zeolites. Furthermore, the ratios in *BEA zeolites was higher than that in MFI zeolites.…”

Section: Introductionmentioning

confidence: 99%

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Increasing Octane Value in Catalytic Cracking of n-Hexadecane with Addition of *BEA Type Zeolite

Shimada¹,

Imai²,

Hayasaki³

et al. 2015

Catalysts

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Abstract:In this study, multifunctional catalysts were developed by adding *BEA or MFI zeolite with high Si/Al ratio to a residual fluidized catalytic cracking (RFCC) catalyst and tested in the catalytic cracking of n-hexadecane, which is a heavy crude oil model compound, for the purpose of increasing the octane value of produced gasoline under the strong hydrogen transfer activity of the RFCC catalyst. Reaction products analysis revealed that the addition of *BEA zeolite to the RFCC catalyst increased the yields of olefins and multi-branched paraffins, which resulted in improvement of the octane value without sacrificing gasoline yield. On the contrary, the addition of MFI zeolite decreased the gasoline yield because it cracks the gasoline range olefins into LPG range olefins. In general, it is difficult to increase the yield of multi-branched molecules because the multi-branched molecule is more easily cracked than linear molecules. Our results suggest the possibility for the selective acceleration of isomerization reaction by the addition of less acidic *BEA zeolite to the RFCC catalyst.

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Section: Reaction Mechanism On the Composite Catalystmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Increasing Octane Value in Catalytic Cracking of n-Hexadecane with Addition of *BEA Type Zeolite

Shimada¹,

Imai²,

Hayasaki³

et al. 2015

Catalysts

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“…MOR (SiO 2 /Al 2 O 3 = 10 -220) and FAU (SiO 2 /Al 2 O 3 = 30), where the value in parenthesis is SiO 2 /Al 2 O 3 ratio of zeolites, were obtained from Tosoh Corporation, Tokyo, Japan, and calcined at 550 °C in an air stream before use. BEA was synthesized by following the procedures in our previous literature [14]. Some of the physicochemical properties of MOR have been discussed elsewhere [8,9].…”

Section: A Catalysts and Reagentsmentioning

confidence: 99%

H-Mordenite as a Molecular Reactor for the Isopropylation of Biphenyl

Joseph¹,

Sugi²,

Ramadass³

et al. 2018

IJCEA

Self Cite

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The dealuminated H-Mordenite (MOR) was used as a molecular reactor for the selective formation of the least bulky 4,4'-diisopropylbiphenyl (4,4'-DIPB) in the isopropylation of biphenyl (BP). The selective formation of 4,4'-DIPB through 4-isopropylbiphenyl (4-IPBP) was observed due to the differentiation from the other bulky isomers by the MOR channels. 4,4'-DIPB selectively allowed the transition state of 4-IPBP by their steric restriction of the channels. The selectivity for 4,4'-DIPB decreased at high temperatures and/or when a large amount of the catalyst was used. These are due to the isomerization of 4,4'-DIPB, once formed in the channels, to a thermodynamically stable 3,4'-and 3,3'-DIPB at the external acid sites. Y-zeolite (FAU) and zeolite-β (BEA) possess wide channels to accommodate the bulkier isomers, which allow the transition states of IPBPs to the DIPBs with 2-and 3-isopropyl moieties.

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Polycrystalline ZSM-5@Beta core–shell composites fabricated by a seed-directed approach: A catalyst to boosting light olefin production by ordered hierarchical cracking

Han

Wang

et al. 2023

Fuel

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Isomerization and Cracking of Hexane over Beta Zeolites Synthesized by Dry Gel Conversion Method

Cited by 3 publications

References 21 publications

Increasing Octane Value in Catalytic Cracking of n-Hexadecane with Addition of *BEA Type Zeolite

Increasing Octane Value in Catalytic Cracking of n-Hexadecane with Addition of *BEA Type Zeolite

H-Mordenite as a Molecular Reactor for the Isopropylation of Biphenyl

Polycrystalline ZSM-5@Beta core–shell composites fabricated by a seed-directed approach: A catalyst to boosting light olefin production by ordered hierarchical cracking

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