Synthesis of ZSM-5 zeolite with small crystal size and its catalytic performance for ethylene oligomerization

Yamamura, Masami; Chaki, Kazutoshi; Wakatsuki, Toshiya; Okado, Hideo; Fujimoto, Kaoru

doi:10.1016/0144-2449(94)90121-x

Cited by 119 publications

(70 citation statements)

References 12 publications

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“…A crystal size of 50-100 A corresponds to 2 to 4 unit cells for faujasite and roughly 2.5 to 5 unit cells for ZSM-5. Yamamura, Chaki, Wakatsuki, Okado & Fujimoto (1994) have convincingly demonstrated the synthesis of 300 A ZSM-5 ('--15 unit cells). Various groups have reported the synthesis of even smaller (ultrasmall) zeolite crystals.…”

Section: Introductionmentioning

confidence: 98%

Computed X-ray Powder Diffraction Patterns for Ultrasmall Zeolite Crystals

Schlenker¹,

Peterson²

1996

J Appl Crystallogr

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Theoretical X-ray diffraction pattems have been calculated for powders of very small faujasite (FAU) and ZSM-5 (MFI) crystallites. These calculated patterns give the first realistic picture of the expected appearance of X-ray powder diffraction patterns of ultrasmall crystals of these well known commercial zeolites. The X-ray patterns were calculated using SKIP-small-crystal interference program-a program originally written to assist in the interpretation of X-ray diffraction patterns of synthetic zeolites and layered materials. The results are somewhat surprising in that they suggest that the crystallite size of faujasite must fall to below 4-5 unit cells before the resulting pattern diverges significantly from the asymptotic pattern. In contrast, the calculated X-ray pattern of ten-unit-cell ZSM-5 crystallites is scarcely recognizable.

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Section: Introductionmentioning

confidence: 98%

Computed X-ray Powder Diffraction Patterns for Ultrasmall Zeolite Crystals

Schlenker¹,

Peterson²

1996

J Appl Crystallogr

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“…However, one disadvantage of these zeolitic catalysts is that their pores (about 0.55 nm) are too small to be accessed by bulky reactants hindering their use in the fine chemical and petroleum processing industries [8,9]. Preparation of nanosized particles is a good option to obtain fast diffusion rate of reactants and high conversion of bulky molecules [10][11][12][13]. However, the reduction in crystal size of zeolites from the micrometer to the nanometer scale leads to the decrease in the crystalline degree, the thermal stability, and substantial changes in the properties.…”

Section: Introductionmentioning

confidence: 99%

Multimodal Zr-Silicalite-1 zeolite nanocrystal aggregates with interconnected hierarchically micro-meso-macroporous architecture and enhanced mass transport property

Chen

et al. 2012

Journal of Colloid and Interface Science

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“…When the crystal size of zeolites is less than 100 nm, they have larger external surface, higher surface energy and shorter channels as compared with the conventional microsized zeolites [1,2]. They are particularly suited for catalysis applications due to these features.…”

Section: Introductionmentioning

confidence: 99%

“…They are particularly suited for catalysis applications due to these features. For example, in the conversion of methanol to hydrocarbons [3] and to ole®ns [4], as well as oligomerization of ethylene [1], nanosized HZSM-5 zeolite exhibits higher catalytic activity, less coke formation and longer life. Thus, there is a growing interest in the synthesis of nanosized zeolites [5±7].…”

Section: Introductionmentioning

confidence: 99%