A core-shell HZSM-5@SBA-15 composite was prepared by the acidic sol-gel coating method using Pluronic P123 as the template. Its structure, properties, and catalytic performance in the conversion of methanol to aromati...A core-shell HZSM-5@SBA-15 composite was prepared by the acidic sol-gel coating method using Pluronic P123 as the template. Its structure, properties, and catalytic performance in the conversion of methanol to aromatics(MTA) were compared with HZSM-5@SiO_2. The silica shells of these two samples can both reduce the acid sites of HZSM-5, and consequently can decrease the formation of coke on the catalyst. However, in the ordered mesoporous SBA-15 shell the aromatics and the coke precursors could diffuse more effectively than in the amorphous SiO_2 shell; therefore, in the MTA reaction catalyzed by HZSM-5@SBA-15 composite a higher BTX selectivity and a longer catalyst cycle length were observed. The cycle length of HZSM-5@SBA-15 was by 50 h longer than that of HZSM-5@SiO_2, and under this situation the selectivity of BTX still reached 56%.展开更多
基金supported by the Program for Liaoning Excellent Talents in Universities,abbreviated as "LNET" (LJQ2015062)the Program for Science and Technology Agency of Liaoning Province (20170540585)+1 种基金the General Scientific Research Project of Liaoning Provincial Department of Education (L2015296, L2016018)the Science and Technology Planning Project of Fushun (FSKJHT201376)
文摘A core-shell HZSM-5@SBA-15 composite was prepared by the acidic sol-gel coating method using Pluronic P123 as the template. Its structure, properties, and catalytic performance in the conversion of methanol to aromatics(MTA) were compared with HZSM-5@SiO_2. The silica shells of these two samples can both reduce the acid sites of HZSM-5, and consequently can decrease the formation of coke on the catalyst. However, in the ordered mesoporous SBA-15 shell the aromatics and the coke precursors could diffuse more effectively than in the amorphous SiO_2 shell; therefore, in the MTA reaction catalyzed by HZSM-5@SBA-15 composite a higher BTX selectivity and a longer catalyst cycle length were observed. The cycle length of HZSM-5@SBA-15 was by 50 h longer than that of HZSM-5@SiO_2, and under this situation the selectivity of BTX still reached 56%.
