Effect of organosilane on physico-chemical properties of mesopore zeolite Y and Fischer-Tropsch reaction performance of catalysts
In order to synthesize a catalyst support with high selectivity for the production of gasoline and diesel fractions,a high-crystallinity mesoporous Y-type molecular sieve was synthesized in situ using various organosilanes as template agents.The effects of silane concentration and substituents on organosilane on the properties of Y-type zeolite were investigated.Zeolite Y was used as catalyst support,cobalt was loaded by impregnation method and the Fischer-Tropsch reaction performance of catalysts was investigated.The samples were analyzed with XRD,BET and SEM,GC-MS and GC were used for qualitative and quantitative analysis of reaction products respectively.The results show that the chemical anchorage of organosilane and siloaluminum species reaches saturation when the ratio of silicon is 1∶30,and further increase in the concentration of silane agent lead to a decrease in the crystallinity of the molecular sieve,a large number of microporous losses,and a significant decrease in particle size.When changing the substituent chain length of organosilanes,the average mesoporous size of molecular sieve can be regulated in the range of 4.9～9.0 nm.In addition,polar organosilanes are more inclined to synthesis of mesoporous zeolite with high crystallinity and high specific surface area.The highest specific surface area reaches 683.7 m2/g.The micropore volume of the polar organosilane group with the same chain length is 30％higher than that of the non-polar organosilane group,while the mesoporous volume is almost the same.In Fischer-Tropler reaction synthesis with syngas as feed gas,the catalyst synthesized with polar organosilane has the highest product selectivity of 31.1％for C10-20,and the catalyst synthesized with non-polar organosilane has the highest product selectivity of 39.7％for C5-12.
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