稀土元素对二氧化硅负载型磷钼酸结构和催化氧化脱硫性能的影响研究
Effect of the rare earth elements on the structure and catalytic oxidative desulfurization activities of phosphomolybdic acid loaded on silica
本文采用溶胶-凝胶法分别制备了La3+、Ce3+ 和Pr3+改性的SiO2负载型磷钼酸作为催化剂，并对催化剂进行了傅里叶红外光谱、X射线衍射和孔隙结构等表征，同时考察了催化剂在温和条件下对模型油的催化氧化脱硫性能。结果表明：催化剂保持了磷钼酸的Keggin型结构，稀土离子的改性明显促进了磷钼酸活性中心的分散和催化剂孔径和比表面积的提高；二苯并噻吩的催化氧化反应符合表观一级动力学规律，且La-Mo/SiO2、Ce-Mo/SiO2和Pr-Mo/SiO2催化二苯并噻吩氧化的活化能分别为30.29 kJ/mol、33.41 kJ/mol 和35.15 kJ/mol。
he catalysts of phosphomolybdic acid loaded on silica and modified with La3+, Ce3+ and Pr3+ respectively were prepared by the sol-gel method and characterized by FT-IR, XRD and pore structure parameters analysis. The oxidative desulfurization of model fuel oil catalyzed by the catalysts have been studied under the mild condition. Results show that the catalysts kept integrity Keggin structures, the active centers of phosphomolybdic acid were greatly scattered and the pore size and specific surface area were increased obviously after modification. The catalytic oxidative reactions of dibenzothiophene (DBT) were accorded with the apparent first-order kinetics, and the apparent activation energies of DBT catalyzed by La-Mo/SiO2, Ce-Mo/SiO2 and Pr-Mo/SiO2 were 30.29 kJ/mol, 33.41 kJ/mol and 35.15 kJ/mol, respectively.
邱江华、王宁、王光辉
非金属元素化学工业、非金属无机化合物化学工业精细化学工业
磷钼酸改性稀土元素氧化脱硫动力学研究
phosphomolybdic acidmodificationrare earth elementsoxidative desulfurization kinetic study
邱江华,王宁,王光辉.稀土元素对二氧化硅负载型磷钼酸结构和催化氧化脱硫性能的影响研究[EB/OL].(2014-06-17)[2025-08-16].http://www.paper.edu.cn/releasepaper/content/201406-263.点此复制
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