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Oxidation of cyclopentene catalyzed by tungsten-substituted molybdophosphoric acids
Jinjuan Xue,Haixia Li,Dongzhi Zhang,Tingshun Jiang,Longbao Yu,Yutang Shen,Hengbo Yin 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.3
A series of Keggin type tungsten-substituted molybdophosphoric acids (H3PMo12−nWnO40·XH2O) were synthesized and characterized by ICP-AES, FT-IR, TG-DSC, and XRD. The tungsten substitution extent significantly affected their catalytic activity in the oxidation of cyclopentene and the selectivity of the resultant products. The tungsten-substituted molybdophosphoric acids with tungsten substitution numbers in a range of 3-6.8 exhibited high catalytic activity in the oxidation of cyclopentene. After reaction for 8 h, the conversion of cyclopentene was up to 97%; the oxidation products mainly consisted of glutaraldehyde, cis-1,2-cyclopentanediol and trans-1,2-cyclopentanediol with the yields of ca. 23%, 27%, and 45%, respectively.
Dongzhi Zhang,Chen Ge,Jinjuan Xue,Tingshun Jiang,Longbao Yu,Yutang Shen,Hengbo Yin 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.4
A series of Cu–Zn–Zr catalysts were prepared by a coprecipitation method and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, temperature programmed reduction, and N2 adsorption. The catalytic activity of the Cu–Zn–Zr catalyst in the hydrogenation of maleic anhydride using ethanol as a solvent was studied at 220–280℃ and 1 MPa. Maleic anhydride was mainly hydrogenated to gbutyrolactone and tetrahydrofuran while ethanol dehydrogenated to ethyl acetate. After reduction, CuO species present in the calcined Cu–Zn–Zr catalysts were converted to metallic copper (Cu0). The presence of ZrO2 favored the deep hydrogenation of g-butyrolactone to tetrahydrofuranwhile the presence of ZnO was beneficial to the formation of the intermediate product g-butyrolactone. The molar ratios of the hydrogen produced in ethanol dehydrogenation to the hydrogen consumed in maleic anhydride hydrogenation increased with the increase of the reaction temperature.
Liuxin Xiang,Yuxian Xia,Ying-Fan Cai,Jijun Liu,Xiaohong He,Quan Sun,Xiaoyan Wang,Yuyin Fu,Yonghong Fan,Daiwen Dong,Guanfan Zhou,Jinjuan Shen,Yihua Liu 한국식물학회 2013 Journal of Plant Biology Vol.56 No.3
The first tuber mustard calmodulin-like (CML) gene BjAAR1 (Brassica juncea var. tumida Tsen et Lee Abiotic stress and Abscisic acid (ABA) Responsive gene 1) was cloned and characterized. The protein encoded by BjAAR1 contains four predicted Ca2+ binding sites (EF-hand motif) and its recombinant protein can bind Ca2+ in vitro. qRT-PCR showed that the expression level of BjAAR1 was rather high in non-swollen stem of tuber mustard and largely reduced in swollen stem. Expression of BjAAR1 enhanced ABA- and stress-induced gene expression in Arabidopsis (Arabidopsis thaliana). Transgenic plants also exhibited hypersensitivity to NaCl, mannitol, and ABA during the seed germination and post-germination stages. ABA biosynthesis inhibitor, norflurazon (NF), rescued hypersensitivity phenotype of transgenic plants to NaCl and mannitol, indicating that BjAAR1 functions in multiple abiotic stresses response through ABA-dependent process.