Faculty Profiles - HIBINO, Takashi

Papers - HIBINO, Takashi

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Shape-selectivity over hzsm-5 modified by chemical vapor deposition of silicon alkoxide Reviewed

Hibino T., Niwa M., Murakami Y.

Journal of Catalysis Vol. 128 ( 2 ) page： 551 - 558 1991.4

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of Catalysis

Alkylation of toluene with methanol and toluene disproportionation have been carried out over HZSM-5 zeolites modified by chemical vapor deposition of silicon alkoxide. As the silica amount increased, the selectivity to m- and o-xylenes decreased, whereas that to p-xylene increased. The fraction of the para isomer in xylenes increased to more than 98%. From adsorption measurements and test reactions, it was found that this modification resulted in the narrowing of the pore-opening size and the inactivation of the external surface. The high para-selectivity was caused primarily by the narrowing of the pore-opening size. © 1991.

DOI： 10.1016/0021-9517(91)90312-R

Scopus

SHAPE-SELECTIVITY OVER HZSM-5 MODIFIED BY CHEMICAL VAPOR-DEPOSITION OF SILICON ALKOXIDE Reviewed

HIBINO T, NIWA M, MURAKAMI Y

JOURNAL OF CATALYSIS Vol. 128 ( 2 ) page： 551 - 558 1991.4

Growth of Silica and its Controlling of Pore-opening Size on CVD Zeolites Reviewed

Hibino T., Niwa M., Kawashima Y., Murakami Y.

Studies in Surface Science and Catalysis Vol. 60 ( C ) page： 151 - 158 1991.1

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Studies in Surface Science and Catalysis

This paper describes how silica grows on the external surface of zeolite, and how it controls the pore-opening size. Silica growth and control of pore-opening size is not affected by the kind of cation but only by the composition of zeolite. The larger the silica content, the more similar the silica layer to the basal plane grows. Due to the subtle difference between overlayer and zeolite, the pore-opening size can be narrowed. Because of the similarity, thicker layers are required for control in the highly siliceous zeolites. © 1991 Kodansha Ltd.

DOI： 10.1016/S0167-2991(08)61894-7

Scopus

Shape-selectivity over ZSM-5 modified by chemical vapor deposition of silicon alkoxide Reviewed

Takashi Hibino, Miki Niwa, Yuichi Murakami

Journal of Catalysis Vol. 128 page： 551-558 1991

Structure of germanium oxide on CVD zeolites by extended X-ray absorption fine structure and X-ray photoelectron spectroscopy Reviewed

Hibino T., Niwa M., Murakami Y., Sano M.

Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases Vol. 85 ( 8 ) page： 2327 - 2334 1989.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases

Chemical vapour deposition of GeO2 from Ge(OCH3) 4 on two kinds of H-mordenite with different silica to alumina ratios has been accomplished, and the deposited GeO2 has been characterized by EXAFS and XPS measurements. Shape-selectivity in cracking of octane isomers was strongly dependent on the composition of mordenite and similar in behaviour to the deposited silica from Si(OCH3)4. The amount of deposited GeO2 required to achieve the shape-selectivity on HM10 (Si/Al = 4.9) was less than that on HM20 (Si/Al = 10.0). On the other hand, the XPS measurement on these CVD mordenites yielded similar results as for the depth distribution of deposited GeO2. Furthermore, from the EXAFS measurement, the coordination numbers of the second-nearest Ge neighbours around the deposited Ge atoms on these CVD mordenites was less than that in α-quartz type GeO2. Based upon these findings, we can make some speculations about the structure of deposited GeO2 on these CVD mordenites: GeO2 is deposited on the external surface, apparently as a thin layer. Therefore, the difference in the shape-selectivity is caused by a difference not in the location but in the structure of the deposited GeO 2 between these CVD mordenites.

DOI： 10.1039/F19898502327

Scopus

STRUCTURE OF DEPOSITED GERMANIUM DIOXIDE WHICH CONTROLS THE PORE-OPENING SIZE OF MORDENITE Reviewed

HIBINO T, NIWA M, MURAKAMI Y, SANO M, KOMAI S, HANAICHI T

JOURNAL OF PHYSICAL CHEMISTRY Vol. 93 ( 23 ) page： 7847 - 7850 1989.11

Structure of deposited germanium dioxide which controls the pore-opening size of mordenite Reviewed

Hibino T., Niwa M., Murakami Y., Sano M., Komai S., Hanaichi T.

Journal of physical chemistry Vol. 93 ( 23 ) page： 7847 - 7850 1989.11

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of physical chemistry

To better understand the fine control of pore-opening size of zeolites by the deposition of silicon alkoxide, germanium alkoxide has been employed as a model reagent for silicon alkoxide, and the structure of deposited GeO2 has been analyzed. When the CVD mordenite was stored under a condition of 100% humidity, followed by heating at 773 K, the deposited GeO2 was found to be transformed from an ultrathin layer into bulky particles on the external surface. Additionally, the shape selectivity gradually deteriorated with the growth of particle. In conclusion, the local protrusion of deposited GeO2 into the pore results into the heterogeneous narrowing of the pore-opening size, and the GeO2 must deposit as an ultrathin layer to improve the shape selectivity effectively. These conclusions may also be applicable to the deposition of silicon alkoxide.

DOI： 10.1021/j100360a024

Scopus

STRUCTURE OF GERMANIUM OXIDE ON CVD ZEOLITES BY EXTENDED X-RAY ABSORPTION FINE-STRUCTURE AND X-RAY PHOTOELECTRON-SPECTROSCOPY Reviewed

HIBINO T, NIWA M, MURAKAMI Y, SANO M

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I Vol. 85 page： 2327 - 2334 1989.8

A SILICA MONOLAYER ON ALUMINA AND EVIDENCE OF LACK OF ACIDITY OF SILANOL ATTACHED TO ALUMINA Reviewed

NIWA M, HIBINO T, MURATA H, KATADA N, MURAKAMI Y

JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS ( 5 ) page： 289 - 290 1989.3

Structure of deposited germanium oxide which controls the pore-opening size of mordenite Reviewed

Takashi Hibino, Miki Niwa, Yuichi Murakami, Mitsuru Sano, Shin-ichi Komai

Journal of Physical Chemistry Vol. 93 page： 7847-7850 1989

Structure of germanium oxide on CVD zeolites by extended X-ray adsorption fine structure and X-ray photoelectron spectroscopy Reviewed

Takashi Hibino, Miki Niwa, Yuichi Murakami, Mitsuru Sano

Journal of the Chemical Society, Faraday Transactions Vol. 85 page： 2327-2334 1989

A silica monolayer on alumina and evidence of lack of acidity of silanol attached to alumina Reviewed

Miki Niwa, Takashi Hibino, Haruhiko Murata, Naonobu Katada, Yuichi Murakami

Journal of the Chemical Society, Chemical Communications page： 289-290 1989

A silica monolayer on alumina and evidence of lack of acidity of silanol attached to alumina Reviewed

Niwa M., Hibino T., Murata H., Katada N., Murakami Y.

Journal of the Chemical Society, Chemical Communications ( 5 ) page： 289 - 290 1989

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of the Chemical Society, Chemical Communications

A silica monolayer on alumina was formed by chemical vapour deposition of silicon methoxide; almost all the silanol attached to the alumina did not form Brønsted acid site.

DOI： 10.1039/C39890000289

Scopus

Chemical vapor deposition method for fine-control of the pore-opening size of Na-mordenite Reviewed

Takashi Hibino, Miki Niwa, Akitaka Hattori, Yuichi Murakami

Applied Catalysis Vol. 44 page： 95-103 1988

Mechanism of chemical vapor deposition of silicon alkoxide on mordenites Reviewed

Miki Niwa, Yoshimi Kawashima, Takashi Hibino, Yuichi Murakami

Journal of the Chemical Society, Faraday Transctions Vol. 84 page： 4327-4336 1988

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Papers - HIBINO, Takashi