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中国化学会第十届全国无机化学学术会议

作者： Lingling Xu Yaping Du Frontier Institute of Science and Technology Xi'an Jiaotong University School of Materials Science and Engineering Nankai University

Oxygen vacancies are usually considered as beneficial in catalytic conversion of polysulfides in lithium-sulfur batteries. In this work, we demonstrated that the conversion of polysulfides was hindered by oxygen vacancies on ultrathin niobic acid. The inferior performance induced by the oxygen vacancy was mainly attributed to the decreased electric conductivity as well as the weakened adsorption of polysulfides on the catalyst surface. This work showed that the care should be taken when designing a new catalyst for the lithium-sulfur battery using defect-engineering strategy.

关键词： niobic acid oxygen vacancy electrochemistry catalytic conversion Li-S battery

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Coating of Mineral acids with niobic Solid acid for Preparing Furfural from Nut Shell of Camellia oleifera Abel

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Open Journal of Forestry 2016年第5期6卷 486-497页

作者： Lisong Hu Menghao Du Jingping Zhang Research Institute of Subtropical Forestry Chinese Academy of Forestry Fuyang China

Nut shell of Camellia oleifera Abel which has large scale of plantation in mountainous region of southern China is abundant renewable resource. The nut shell is suitable for preparation of furfural, as the content of which is as much as 16% (based the dried nut shell). In early time, mineral acids were employed as typically catalyst for preparing of furfural from the nut shells. These mineral acids could pollute water and corrode equipment. In this paper we used various mineral acids coating with niobic acid as catalysts to investigate reactions for preparation of furfural. Among these catalysts, the catalyst of sulfuric acid coating with niobic acid was found to be very effective, which had higher hammett acidity and better effect of hydrolysis of the nut shells;The catalysts of sulfuric acid coating with niobic acid was characterized, and the conditions of preparation of the catalyst were investigated. The optimum conditions were: sulfuric acid as coating acid, the concentration of sulfuric 1.1 mol/L, impregnation time 8 h, calcination time 8 h and calcination temperature 450°C. Then hydrolysis of the nut shells was explored, the optimum conditions were as follows: dose of catalyst 20%, ratio of solid to liquid 1:15, reaction temperature 100°C, reaction time 4 h;Under this condition, the yield of furfural was 8.7%.

关键词： Furfural niobic acid Nut Shell of Camellia oleifera Abel Hydroliysis

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