Influence of reaction temperature and crystallite size on HBEA zeolite deactivation by coke

Magnoux, P.; Rabeharitsara, Andry Tahina; Cerqueira, Henrique S.

doi:10.1016/j.apcata.2006.02.040

Cited by 41 publications

(24 citation statements)

References 48 publications

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“…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%

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: Introductionmentioning

confidence: 99%

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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“…These four mass numbers can be designated to 4-methyl-1-pentene through retrieval [27], indicating that the adsorbed toluene performed oligomer cracking [3] and one of the possible products was 4-methyl-1-pentene, partially corresponding to Peak 179 of GC spectrum. The oligomer and coke, mainly composed of polyaromatic hydrocarbons (PAHs), were produced during the cracking of toluene [28,29], which were also demonstrated by the fact that the sample color changed to black after tests. Therefore, the Peak 413 of the GC spectrum might be assigned to some produced PAHs, which can not be given in Fig.…”

Section: Analysis With Msmentioning

confidence: 98%

“…This proposed that some adsorbed species from toluene were oxidized and even completely oxidized to CO 2 at much higher temperature. Several investigations [28][29][30][31][32][33] pointed out that the HC adsorbed on zeolite can be protonated by acid sites and form the carbenium ions, which are in favor of cracking and oxidation. The higher acid strength would cause higher activity of cracking and oxidation for zeolite [34,35].…”

Section: Analysis With Msmentioning

confidence: 99%

Synthesis and Toluene Adsorption/Desorption Property of Beta Zeolite Coated on Cordierite Honeycomb by an In Situ Crystallization Method

Zhang

Wang

et al. 2008

Chem Eng & Technol

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The beta zeolite on cordierite ceramic monolith was synthesized by an in situ crystallization method and characterized by XRD, N 2 adsorption/desorption, SEM and NH 3 -TPD techniques. Toluene adsorption/desorption was used as probe test for the control of cold-start emissions and treatment of volatile organic compounds. The presence of beta on the supports was confirmed by XRD, SEM, and N 2 adsorption/desorption measurements. The zeolite crystals grow both into the cordierite macropores and on the surface of the monolith channels, which form an integrated network ensuring a strong adherence. The highly dispersed beta on supports, demonstrated by larger surface area and adsorption capacity of N 2 , resulted in a significant increase of the total acidity, and thus a greater adsorption capacity for toluene. Furthermore, it could trap larger amounts of toluene to higher temperature and show considerable activity for toluene cracking and oxidation. These are attributed to the greater acidity and stronger acid sites of in situ synthesized beta.

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“…Two primary strategies have been proposed to lower diffusion resistance and enhance mass transfer: one is to create mesopores within the zeolite crystals [16][17][18], and the other is to reduce the crystallite size to the nanometer size [19][20][21][22][23][24][25][26][27]. In fact, nanometer-sized zeolites have been shown to greatly reduce the diffusion resistance and dramatically suppress coke deposition [28].…”

Section: Introductionmentioning

confidence: 99%

Coking on micrometer- and nanometer-sized mordenite during dimethyl ether carbonylation to methyl acetate

Xue

Huang

Ditzel³

et al. 2013

Chinese Journal of Catalysis

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Influence of reaction temperature and crystallite size on HBEA zeolite deactivation by coke

Cited by 41 publications

References 48 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

Synthesis and Toluene Adsorption/Desorption Property of Beta Zeolite Coated on Cordierite Honeycomb by an In Situ Crystallization Method

Coking on micrometer- and nanometer-sized mordenite during dimethyl ether carbonylation to methyl acetate

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