Modification of pore size of MFI-type zeolite by catalytic cracking of silane and application to preparation of H2-separating zeolite membrane

Masuda, Toshio; Fukumoto, Naohiro; Kitamura, Mitsutaka; Mukai, Shin R.; Hashimoto, Kenji; Tanaka, Tsunehiro; Funabiki, Takuzo

doi:10.1016/s1387-1811(01)00358-4

Cited by 91 publications

(82 citation statements)

References 10 publications

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“…In this case, because the acid sites are accessible for these silane compounds, almost all of the acid sites can be deactivated, decreasing the pore size of ZSM-5 zeolites. A ZSM-5 zeolite membrane after CCS treatment using these silane compounds exhibited improved properties for separation of H 2 from an H 2 /N 2 mixture due to pore sizes that were smaller than those before CCS treatment [24].…”

Section: Regioselective Deactivation Of Acid Sites By Ccs Methodsmentioning

confidence: 99%

“…Niwa et al [36][37][38] developed a method utilizing chemical vapor deposition (CVD) with tetraethoxysilane and/or tetramethoxysilane precursors to form a thin SiO 2 layer on the external surface of zeolite crystals. Another proposed method for SiO 2 formation is based on catalytic cracking of silane (CCS method) using organic silane compounds, in which SiO 2 formation selectively occurs on the acid sites of the zeolite [24][25][26].…”

Section: Catalytic Cracking Of Silane Methodsmentioning

confidence: 99%

“…The procedure for the CCS method is outlined in Fig. 6 [24,26]. After air calcination, the zeolite is exposed to vapor of the silane compound at 373 to 393K in a N 2 stream, and then the feed of the silane compound is stopped to remove the silane compounds physically adsorbed on the zeolite surface.…”

Section: Catalytic Cracking Of Silane Methodsmentioning

confidence: 99%

“…The pore size of the zeolite is expected to decrease slightly after CCS treatment [24]. The diameter of a silicon cation with a coordination number of 4 is about 0.08 nm, hence, the pore size at locations where SiO 2 units have formed should decrease with the size of SiO 2 .…”

Section: Catalytic Cracking Of Silane Methodsmentioning

confidence: 99%

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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: Regioselective Deactivation Of Acid Sites By Ccs Methodsmentioning

confidence: 99%

Section: Catalytic Cracking Of Silane Methodsmentioning

confidence: 99%

Section: Catalytic Cracking Of Silane Methodsmentioning

confidence: 99%

Section: Catalytic Cracking Of Silane Methodsmentioning

confidence: 99%

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

et al. 2012

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“…It has also been found that the cracking of aromatics such as silanes can modify the MFI pore structure to obtain a higher adsorption selectivity of H 2 . 39 Our previous studies on alkaliexchanged MFI structures have focused on Na + as the nonframework cation. 25 In the present paper, the adsorption of C 1 -C 4 alkanes over various alkali and alkali earth metal exchanged MFI-type zeolites is studied using configurational-bias Monte Carlo (CBMC) simulations.…”

Section: Introductionmentioning

confidence: 99%

Simulating the Effect of Nonframework Cations on the Adsorption of Alkanes in MFI-type Zeolites

et al. 2003

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We performed configurational-bias Monte Carlo (CBMC) simulations for the adsorption of methane, ethane, propane, butane, and isobutane in MFI-type zeolites with different concentration and nature of nonframework cations. Additional molecular simulations for a mixture of butane/isobutane in these MFI-type zeolites were carried out. The effect of the contentsdensity and naturesof nonframework cations was systematically analyzed, and our results show that even though all of the MFI-type zeolites are structurally similar, differences in the size and concentration of the nonframework cations lead to differences in their adsorptive properties and selectivity performance. For a given cation, the adsorption of alkanes in MFI increases with decreasing the nonframework cation concentration, and for a given Si/Al ratio, the adsorption of alkanes in MFI increases with decreasing atomic weight of the nonframework cation.

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Gas Separations with Zeolite Membranes

2019

Microporous Materials for Separation Membranes

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Modification of pore size of MFI-type zeolite by catalytic cracking of silane and application to preparation of H2-separating zeolite membrane

Cited by 91 publications

References 10 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

Simulating the Effect of Nonframework Cations on the Adsorption of Alkanes in MFI-type Zeolites

Gas Separations with Zeolite Membranes

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