摘要
通过四硫代钼酸铵与四甲基氯化铵的甲基取代反应合成了四甲基四硫代钼酸铵,并通过四甲基四硫代钼酸铵热解制备了具有较高比表面积的二硫化钼.结果显示,由四甲基四硫代钼酸铵热解可以得到比表面积为108m2/g以上的二硫化钼,而由四硫代钼酸铵热解得到的二硫化钼样品的比表面积仅为16m2/g.由四甲基四硫代钼酸铵热解得到的二硫化钼样品具有较低的结晶度,样品具有像干酪样状的半球形和卵形孔穴排列的特点,其孔径尺寸为4～12nm.四甲基四硫代钼酸铵热解制备的二硫化钼在喹啉选择加氢中显示出较高的催化活性和选择性.
Tetramethylammonium thiomolybdate, being used as a precursor for molybdenum disulfide, was synthesized at room temperature using an aqueous solution of ammonium tetrathiomolybdate and tetramethylammonium chloride. Molybdenum disulfide was prepared by the decomposition of tetramethylammonium thiomolybdate or ammonium tetrathiomolybdate and was characterized by N2 physisorption, X-ray diffraction, and scanning electron microscopy. The results showed that molybdenum disulfide prepared from tetramethylammonium thiomolybdate had higher specific surface area of 108 m^2/g with narrower pore size distribution of 4-12 nm, while the sample prepared from ammonium tetrathiomolybdate had a specific surface area of only 16 m^2/g. The crystalline of the molybdenum disulfide prepared from tetramethylammonium thiomolybdate was lower than that from ammonium tetrathiomolybdate. The high-surface-area molybdenum disulfide possessed higher catalytic activity and higher selectivity for 1,2,3,4-tetrahydroquinoline in the selective hydrogenation of quinoline in a fixed-bed reactor. The catalytic performance of high-surface-area molybdenum disulfide was similar to that of noble metal catalysts in the selective hydrogenation of quinoline.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2009年第1期78-82,共5页
基金
新世纪优秀人才支持计划(NCET-07-0133)
大连市科学技术基金(2007J22JH008)
关键词
四硫代钼酸铵
四甲基氯化铵
四甲基四硫代钼酸铵
二硫化钼
喹啉
选择加氢
ammonium tetrathiomolybdate
tetramethylammonium chloride
tetramethylammonium thiomolybdate
molybdenum disulfide
quinoline
selective hydrogenation
