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Catalytic liquid-phase oxidation of acetaldehyde to acetic acid over a Pt/CeO_2–ZrO_2–SnO_2/γ-alumina catalyst

Journal of Environmental Sciences 2015年第10期27卷 63-66页

作者： Pil-Gyu Choi takanobu ohno Toshiyuki Masui Nobuhito Imanaka Department of Applied Chemistry Faculty of EngineeringOsaka University

Pt/CeO2–ZrO2–SnO2/γ-Al2O3 catalysts were prepared by co-precipitation and wet impregnation methods for catalytic oxidation of acetaldehyde to acetic acid in water. In the present catalysts, Pt and CeO2–ZrO2–SnO2 were successfully dispersed on the γ-Al2O3 *** of platinum content and reaction time on the selective oxidation of acetaldehyde to acetic acid were investigated to optimize the reaction conditions for obtaining both high acetaldehyde conversion and highest selectivity to acetic acid. Among the catalysts, a Pt（6.4 wt.%）/Ce0.68Zr0.17Sn0.15O2.0（16 wt.%）/γ-Al2O3 catalyst showed the highest acetaldehyde oxidation activity. On this catalyst, acetaldehyde was completely oxidized after the reaction at 0°C for 8 hr, and the selectivity to acetic acid reached to 95%and higher after the reaction for 4 hr and longer.

关键词： Liquid-phase oxidation Acetaldehyde Rare earths Catalyst

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Catalytic liquid phase oxidation of 1,4-dioxane over a Pt/CeO_(2)-ZrO_(2)-Bi_(2)O_(3)/SBA-16 catalyst

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Journal of Advanced Ceramics 2015年第1期4卷 71-75页

作者： Pil-Gyu CHOI takanobu ohno Nashito FUKUHARA Toshiyuki MASUI Nobuhito IMANAKA Department of Applied Chemistry Faculty of EngineeringOsaka University2-1 YamadaokaSuitaOsaka 565-0871Japan

A Pt/CeO_(2)-ZrO_(2)-Bi_(2)O_(3)/SBA-16(Santa Barbara Amorphous No.16)catalyst was prepared by hydrothermal and wet impregnation methods for catalytic purification of 1,4-dioxane in ***-16 has a number of mesopores and the average size of the pores is 9.4 *** the present catalyst,platinum and CeO_(2)-ZrO_(2)-Bi_(2)O_(3)were successfully dispersed in the pores of the SBA-16 support,and the temperature dependence of the liquid phase oxidation of 1,4-dioxane was *** oxidation reaction proceeded effectively in the air atmosphere in the temperature range of 40-80℃.

关键词： composite materials oxidation porous materials 1,4-dioxane catalyst

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Distribution of HBV genotypes among HBV carriers in Benin:phylogenetic analysis and virological characteristics of HBV genotype E

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World Journal of Gastroenterology 2005年第41期11卷 6410-6415页

作者： Kei Fujiwara Yasuhito Tanaka Etsuro Orito Tomoyoshi ohno takanobu Kato Kanji Sugihara Izumi Hasegawa Mayumi Sakurai Kiyoaki Ito Atsushi Ozasa Yuko Sakamoto Isao Arita Ahmed El-Gohary Agossou Benoit Sophie I Ogoundele-Akplogan Namiko Yoshihara Ryuzo Ueda Masashi Mizokami Department of Internal Medicine and Molecular Science Nagoya City University Graduate School of Medical Sciences NagoyaJapan Department of Clinical Molecular Informative Medicine Nagoya City University Graduate School of Medical Sciences NagoyaJapan AIDS Research Center National Institute of Infectious Disease TokyoJapan Agency for Cooperation in International Health Kumamoto Japan Clinical Pathology Department Faculty of Medicine Suez Canal UniversityIsmailiaEgypt Central National Blood Transfusion Center Cotonou Benin Hematology Lab-CNHUC Cotonou Benin

AIM: To determine the distribution of Hepatitis B virus (HBV) genotypes in Benin, and to clarify the virological characteristics of the dominant ***: Among 500 blood donors in Benin, 21 HBsAg-positive donors were enrolled in the study. HBV genotypes were determined by enzyme immunoassay and restriction fragment length polymorphism. Complete genome sequences were determined by PCR and direct ***: HBV genotype E (HBV/E) was detected in 20/21 (95.2%), and HBV/A in 1/21 (4.8%). From the age-specific prevalence of HBeAg to anti-HBe seroconversion (SC) in 19 HBV/E subjects, SC was estimated to occur frequently in late teens in HBV/*** comparison of four complete HBV/E genomes from HBeAg-positive subjects in this study and five HBV/E sequences recruited from the database revealed that HBV/E was distributed throughout West Africa with very low genetic divers ity (nucleotide homology 96.7-99.2%).Based on the sequences in the basic core promoter (BCP)to precore region of the nine HBV/E isolates compared to those of the other genotypes, a nucleotide substitution in the BCP, G1757A, was observed in HBV/***: HBV/E is predominant in the Republic of Benin, and SC is estimated to occur in late teens in HBV/E. The specific nucleotide substitution G1757A in BCP, which might influence the virological characteristics,is observed in HBV/E.

关键词： HBV genotype West Africa Basic corepromoter

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