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61. Ceria-modification of H-mordenites

Author

Tawada, S, primary, Sugi, Y, additional, Kubota, Y, additional, Imada, Y, additional, Hanaoka, T, additional, Matsuzaki, T, additional, Nakajima, K, additional, Kunimori, K, additional, and Kim, J.-H, additional

Published
2000
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69. Catalysis

Author

Metcalfe, Ian, primary, Sugi, Y, additional, Groppi, G, additional, Sheldon, R, additional, and Wachs, I E, additional

Published
1997
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84. Risk factors for nausea and vomiting following vitrectomy in adults.

Author

Nitahara, K., Sugi, Y., Shono, S., Hamada, T., and Higa, K.

Subjects
POSTOPERATIVE nausea & vomiting, OPHTHALMIC surgery, SURGICAL complications, VITRECTOMY, POSTOPERATIVE period, SURGICAL therapeutics, DISEASE risk factors
Abstract

Background and objective: Postoperative nausea and vomiting (PONY) after ophthalmic surgery under general anaesthesia remains a complex and perturbing complication associated with several factors. Little information is available regarding the risk factors for nausea and vomiting after vitrectomy in adults. In this study, we evaluated the potential risk factors for PONY after vitrectomy in adult patients. Methods: Univariate and multivariate analyses of clinical factors associated with PONY were undertaken in a retrospective case-control series of 247 adult patients undergoing vitrectomy undergeneral anaesthesia. We examined PONY for the first 48 h. Factors examined were age, body mass index (BMI), smoking status, H2-blocker as premedication, type of general anaesthesia (sevoflurane and fentanyl or total intravenous (i.v.) anaesthesia with propofol and fentanyl), duration of surgery, and intraoperative fentanyl dose. Results: Fifty-nine patients (24%) reported one or more episodes of PONY during the study period. Female gender (P < 0.01), lower BMI (P < 0.01) and general anaesthesia with inhalational anaesthetics (P < 0.01) were significantly related to nausea during the first 2 h postoperatively. Female gender (P < 0.01) was significantly related to nausea and vomiting throughout the study period. Other factors, including smoking status, did not alter the risk for nausea and/or vomiting. Conclusions: We conclude that female gender, lower BMI and inhalation anaesthesia are the main risk factors for PONY after vitrectomy in adults. Smoking status did not reduce the incidence of PONY in our patients. [ABSTRACT FROM AUTHOR]

Published
2007
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85. Effects of SiO2/Al2O3 ratio of H-mordenite on encapsulated products inside the pores in shape-selective isopropylation of biphenyl.

Author

Hanaoka, T., Nakajima, K., Sugi, Y., Matsuzaki, T., Kubota, Y., Tawada, S., Kunimori, K., and Igarashi, A.

Abstract

The effects of SiO2/Al2O3 ratio of H-mordenite on the selectivity of encapsulated products in the pores and of bulk products were investigated in the isopropylation of biphenyl. The selectivity of 4,40 -diisopropylbiphenyl (4,40 -DIPB) of bulk products was varied with SiO2/Al2O3 ratio. Highly dealuminated H-mordenite gave a selectivity higher than 80%, whereas the selectivity was low for H-mordenite with SiO2/Al2O3 ratio of 10-20. On the other hand, the selectivity of 4,40 -DIPB in encapsulated DIPB isomers was higher than 85% for all H-mordenites regardless of SiO2/Al2O3 ratio. These results show that all H-mordenites catalyze the isopropylation of biphenyl with high shape-selectivity inside the pore. The low selectivity of 4,40 -DIPB in bulk products for H-mordenites with low SiO2/Al2O3 ratio was not due to a lack of shape-selectivity of the H-mordenites, but to non-regioselective isopropylation at the external acid sites. Non-regioselective catalysis over H-mordenite with low SiO2/Al2O3 ratio could be induced by choking pores by coke deposition. [ABSTRACT FROM AUTHOR]

Published
1998
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92. Effects of SiO2/Al2O3ratio of H-mordenite on encapsulated products inside the pores in shape-selective isopropylation of biphenyl

Author

Hanaoka, T., Nakajima, K., Sugi, Y., Matsuzaki, T., Kubota, Y., Tawada, S., Kunimori, K., and Igarashi, A.

Abstract

The effects of SiO2/Al2O3 ratio of H-mordenite on the selectivity of encapsulated products in the pores and of bulk products were investigated in the isopropylation of biphenyl. The selectivity of 4,40 -diisopropylbiphenyl (4,40 -DIPB) of bulk products was varied with SiO2/Al2O3 ratio. Highly dealuminated H-mordenite gave a selectivity higher than 80%, whereas the selectivity was low for H-mordenite with SiO2/Al2O3 ratio of 10-20. On the other hand, the selectivity of 4,40 -DIPB in encapsulated DIPB isomers was higher than 85% for all H-mordenites regardless of SiO2/Al2O3 ratio. These results show that all H-mordenites catalyze the isopropylation of biphenyl with high shape-selectivity inside the pore. The low selectivity of 4,40 -DIPB in bulk products for H-mordenites with low SiO2/Al2O3 ratio was not due to a lack of shape-selectivity of the H-mordenites, but to non-regioselective isopropylation at the external acid sites. Non-regioselective catalysis over H-mordenite with low SiO2/Al2O3 ratio could be induced by choking pores by coke deposition.

Published
1998
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93. The promoter function of molybdenum in Rh/Mo/SiO2 catalysts for CO hydrogenation

Author

Shen, J. Y., Matsuzaki, T., Hanaoka, T., Takeuchi, K., and Sugi, Y.

Abstract

A series of Rh/Mo/SiO2 catalysts with fixed Rh and different Mo contents were studied by FT-IR, chemisorption and CO hydrogenation. The FT-IR results at room temperature under CO atmosphere indicate that the addition of Mo to Rh/SiO2 suppresses the linear and bridged CO species and promotes the twin CO species, which is consistent with the chemisorption results. It is suggested that the Mo promoter works via stabilization of Rh1– ions and the coverage of Rh sites. The molybdenum promotes the formation of oxygenates and shifts the selectivity from hydrocarbons to oxygenates.

Published
1994
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94. Shape-selective alkylation of biphenyl over mordenite: cerium exchanged sodium mordenite and unmodified H-mordenite with low SiO2/Al2O3 ratio

Author

Sugi, Y., Matsuzaki, T., Hanaoka, T., Kubota, Y., Kim, J. -H., Tu, X., and Matsumoto, M.

Abstract

Liquid phase isopropylation of biphenyl with propylene was studied over a cerium exchanged sodium mordenite (Ce/NaM25) and a H-mordenite (HM25) with the same SiO2/Al2O3 ratio of 25. Shape-selective catalysis occurred to give 4,4'-diisopropylbiphenyl (4,4'-DIPS) in high selectivity over Ce/NaM25 under any propylene pressures. HM25 gave 4,4'-DIPS shape-selectively under high propylene pressures. However, the reaction was severely deactivated at a conversion of ca. 60% under such a low pressure as 0.8 kg/cm2 because of coke formation in the pore. The yields of 4-isopropylbiphenyl (4-IPBP) and 4,4'-DIPB decreased with the increase of those of 3-IPBP and 3,4'-DIPB because of non-selective alkylation and isomerization at external acid sites that are alive in spite of severe deactivation. No significant isomerization of 4,4'-DIPB over Ce/NaM25 was observed even at low propylene pressure. In the case of HM25, the isomerization of 4,4'-DIPB to 3,4'-DIPB occurred significantly under low propylene pressures, while it decreased under high pressure. These differences are ascribed to the differences of nature of acid sites between Ce/NaM25 and HM25 zeolites.

Published
1994
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