Catalytic cracking of alkanes on MCM-22 zeolite. Comparison with ZSM-5 and beta zeolite and its possibility as an FCC cracking additive

Corma, Avelino; González-Alfaro, Vicenta; Orchillés, A. Vicent

doi:10.1016/0926-860x(95)00081-x

Cited by 80 publications

(40 citation statements)

References 20 publications

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“…Promising candidate routes for producing light olefins include catalytic cracking of naphtha [55][56][57][58] and oxygen-containing chemicals to olefins, such as methanol-to-olefins (MTO) [59,60], ethanol-to-olefins (ETO) [61][62][63][64], and acetone-to-olefins (ATO) [65][66][67][68][69][70][71]. In these olefin syntheses, the initial products consist mainly of lighter olefins such as ethylene, propylene and butylene.…”

Section: Catalytic Reactionmentioning

confidence: 99%

Size-Controlled Synthesis of Nano-Zeolites and Their Application to Light Olefin Synthesis

et al. 2012

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For the application of zeolites as heterogeneous catalysts, low diffusion resistance for hydrocarbons within the micropore is essential for improving product selectivity and catalyst lifetime. This problem has been overcome by reducing the crystal size. This review introduces size-controlled preparation of nano-sized zeolites via hydrothermal synthesis in water/surfactant/organic solvent (emulsion method) and their application to heterogeneous catalysts. The ionicity of the hydrophilic group in surfactant molecules and the concentration of the Si source affected the crystallinity and morphology of zeolites prepared using the emulsion method. When using a non-ionic surfactant, mono-dispersed silicalite-1 nanocrystals approximately 60 nm in diameter were successfully prepared. Nano-and macro-ZSM-5 zeolites with crystal sizes of approximately 150-200 nm and 1.5 µm, respectively, were prepared and applied to n-hexane cracking and acetone-to-olefin reactions to investigate the effect of zeolite crystal size on catalytic stability and light olefin yield. Application of nano-zeolite to light olefin production was effective in achieving faster mass transfer of hydrocarbon molecules within the micropore, which led to improvements in olefin yields and catalyst lifetime.

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Section: Catalytic Reactionmentioning

confidence: 99%

Size-Controlled Synthesis of Nano-Zeolites and Their Application to Light Olefin Synthesis

et al. 2012

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“…A promising catalyst for the catalytic cracking of naphtha is zeolite, which is a crystalline aluminosilicate material with various properties, such as strong acidity and high surface area, and studies on the catalytic cracking of alkane over zeolite catalysts have been reported [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Kinetics of n-hexane cracking over ZSM-5 zeolites – Effect of crystal size on effectiveness factor and catalyst lifetime

Konno

Okamura

Kawahara

et al. 2012

Chemical Engineering Journal

167

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The catalytic cracking of n-hexane over ZSM-5 zeolite (MFI-type zeolite, Si/Al = 150 and 240) catalysts was examined at reaction temperatures ranging from 823 to 923 K under atmospheric pressure. The reaction rate constants and activation energies of n-hexane cracking over ZSM-5 zeolites with various crystal sizes and Si/Al ratios were evaluated. The catalytic cracking of n-hexane was first order with respect to the n-hexane concentration, and the activation energies of n-hexane cracking over ZSM-5 zeolites were found to be approximately 123-128 kJmol -1 . Compared with the macro-sized zeolite, the nano-sized zeolites exhibited high n-hexane conversion with stable activity for 50 h. This is because the cracking reaction with nano-sized zeolite proceeded under reaction-limiting conditions, whereas the reaction with macro-sized zeolite proceeded under transition conditions between reaction-and diffusion-limiting conditions. As a result, the application of nano-zeolite to the catalytic cracking of n-hexane was effective and gave light olefins with high yield and excellent stable activity.

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“…5) It has been claimed to be useful for a variety of hydrocarbon conversion reactions such as alkylation, disproportionation, isomerization, cracking, etc. [6][7][8][9][10] MWW has been successfully synthesized by static condition, and compared its morphology with the rotating condition by Güray and his co-workers.…”

Section: Mcm-22 (Mww) Is a Family Of High Silica Zeolite Which Was Fmentioning

confidence: 99%

Seeding on the Synthesis of MCM-22 (MWW) Zeolite by Dry-Gel Conversion Method and its Catalytic Properties on the Skeleton Isomerization and the Cracking of Hexane

et al. 2005

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The effects of seeding on synthesis of MCM-22 (MWW) have been studied by the dry gel conversion (DGC) method. Highly reproducible crystalline MWW zeolite could be obtained by DGC method, using seeds of calcined sodium MWW with SiO 2 /Al 2 O 3 ¼ 31. Crystallization of MWW phase was completed in the presence of seeds (2 mass% against SiO 2 ) at 150 C within two days. The small amount of seed (0.25 mass% against SiO 2 ) was sufficient for the required phase formation of MWW. The MWW with SiO 2 /Al 2 O 3 ratio from 35 to 66 was obtained as pure phase; however, the crystallinity of MWW decreased with further increase in the ratio: products were contaminated with impurities.The catalytic properties of MWW were examined in the skeleton isomerization and the cracking of hexane, and compared to zeolites such as BEA, MFI, and MOR. The catalytic activities were in the order: MFI>BEA>MWW)MOR; however, the selectivity for the isomerization were in the order: BEA>MWW>MFI. These catalytic properties were due to the differences of structures and acid strength of zeolites.

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Catalytic cracking of alkanes on MCM-22 zeolite. Comparison with ZSM-5 and beta zeolite and its possibility as an FCC cracking additive

Cited by 80 publications

References 20 publications

Size-Controlled Synthesis of Nano-Zeolites and Their Application to Light Olefin Synthesis

Size-Controlled Synthesis of Nano-Zeolites and Their Application to Light Olefin Synthesis

Kinetics of n-hexane cracking over ZSM-5 zeolites – Effect of crystal size on effectiveness factor and catalyst lifetime

Seeding on the Synthesis of MCM-22 (MWW) Zeolite by Dry-Gel Conversion Method and its Catalytic Properties on the Skeleton Isomerization and the Cracking of Hexane

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