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Wu J.-L.,Fudan University | Chen M.,Fudan University | Chen M.,Zhejiang Chemical Industry Research Institute | Liu Y.-M.,Fudan University | And 3 more authors.
Catalysis Communications | Year: 2013

A series of mesoporous β-Ga2O3 with high surface area have been prepared using eco-friendly sucrose as a non-surfactant template and studied in relation to their performance in the dehydrogenation of propane to propylene in the presence of CO2. Among the four sucrose-derived samples tested, the material prepared from a sucrose/Ga2O3 molar ratio of 4 achieved the highest propane conversion, which was approximately the double efficiency of the conventional β-Ga 2O3. The enhanced activity of the sucrose-derived materials is attributed to a high abundance of coordinative unsaturated surface Ga sites as a consequence of their favorable textural properties and enhanced surface areas. © 2012 Elsevier B.V. Source

Hang X.-C.,CAS Shanghai Institute of Organic Chemistry | Gu W.-P.,CAS Shanghai Institute of Organic Chemistry | Chen Q.-Y.,CAS Shanghai Institute of Organic Chemistry | Xiao J.-C.,CAS Shanghai Institute of Organic Chemistry | And 2 more authors.
Journal of Fluorine Chemistry | Year: 2011

Both experimental and computational approaches have been employed in the present work to investigate the thermal conversion of substituted difluoro(methylene)cyclopropanes (F2MCP) E-1,1-difluoro-2,2-dimethyl- 3-tosylmethylene cyclopropane 1, to the thermodynamically more stable F 2MCP products, 1,1-difluoro-2-tosyl-3-(propan-2-ylidene)cyclopropane 2, and 1-(3-(difluoromethylene)-2,2-dimethylcyclopropylsulfonyl)-4-methylbenzene 3. The X-ray crystal structure has been obtained for both 1 and 2, respectively, based on which theoretical analyses on their structure and stability have been carried out. Possible reaction mechanisms are proposed. © 2010 Elsevier B.V. All rights reserved. Source

Chen M.,Fudan University | Chen M.,Zhejiang Chemical Industry Research Institute | Wu J.-L.,Fudan University | Liu Y.-M.,Fudan University | And 2 more authors.
Catalysis Communications | Year: 2011

Dehydrogenation of propane coupled with N2O over a series of binary In2O3 - Al2O3 mixed oxides was investigated. In contrast to the poor performance for sole N2O decomposition, a remarkable synergy was identified between N2O decomposition and propane dehydrogenation. Among the catalysts tested, the In2O3 - Al2O3 sample containing a 20 mol% In2O3 showed the highest activity for propane dehydrogenation in the presence of N2O. Moreover, stability far superior to those of the conventional iron-based materials was observed, attributable to the moderate surface acidity of the In - Al - O composite. The essential role of N2O is suggested to generate active oxygen species facilitating propane dehydrogenation. © 2011 Elsevier B.V. All rights reserved. Source

Rao Q.,Huazhong Agricultural University | Rao Q.,Beijing Academy of Agriculture and Forestry Sciences | Xu Y.-H.,Zhejiang Chemical Industry Research Institute | Luo C.,Beijing Academy of Agriculture and Forestry Sciences | And 5 more authors.
Journal of Integrative Agriculture | Year: 2012

Four strains of the Q biotype and one of the B biotype of the whitefly Bemisia tabaci collected from China were characterised for resistance to four neonicotinoid insecticides and pymetrozine. Q biotype strains showed moderate to strong resistance to imidacloprid, thiamethoxam and acetamiprid, but little or no cross-resistance to dinotefuron. Resistance to neonicotinoids was consistently associated with resistance to pymetrozine, despite the latter having a distinct (though unresolved) mode of action. The single B biotype strain proved largely susceptible to all the insecticides investigated. Resistance in the Q biotype strains was associated with over-expression of a cytochrome P450 monooxygenase gene, CYP6CM1, whose substrate specificity presumably accounts for the observed cross-resistance profiles. © 2012 Chinese Academy of Agricultural Sciences. Source

Wen Y.,Zhejiang University | Wen Y.,Zhejiang Chemical Industry Research Institute | Shen C.,Zhejiang University | Ni Y.,Zhejiang University of Technology | And 2 more authors.
Journal of Hazardous Materials | Year: 2012

There is a need to explore effective and green approaches to enhancing the ability to use chitosan for contaminant removal for practical implementation of this technology. In the present study, glow discharge plasma (GDP), which has thus far been studied for degradation of contaminants, was used for the first time to pre-treat chitosan for dye removal in aqueous solution. The results show that the GDP treatment changed the morphology and crystallinity of chitosan particles, and the number of -CH 2 and -CH 3 groups in the chitosan samples increased. Various pretreatment parameters, including discharge current and time, played significant roles in the chitosan modification. It is observed that dye uptake in GDP-modified chitosan was faster than adsorption in untreated chitosan. The maximum adsorption by chitosan followed the order of untreated chitosan Source

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