合成条件对SAPO-11分子筛性质及催化性能的影响

通过调变SAPO-11分子筛合成的水/铝比n(H2O)/n(Al2O3)]、晶种添加量、晶化温度,合成了系列SAPO-11分子筛,研究合成条件对SAPO-11分子筛物化性质及其催化1-己烯临氢异构化性能的影响.结果表明:适当提高体系水/铝比,可使SAPO-11分子筛晶化时产生优先生长现象,从而暴露出更多孔口,提高分子...

IMPACT OF WATER AMOUNT AND SEED CRYSTAL ON SAPO-11 MOLECULAR SIEVE SYNTHESIS AND ISOMERIZATION PERFORMANCE

A series of SAPO-11 molecular sieves were synthesized by adjusting the n(H₂O)/n(Al₂O₃)ratio,the amount of seed crystals addition and crystallization temperature in the SAPO-11 molecular sieve synthesis process,and the effects of synthesis conditions on the physicochemical properties of molecular sieves and the catalytic performance in 1-hexene hydroisomerization were studied.The results show that the preferential growth of SAPO-11 molecular sieves can be obtained by increasing ratio of n(H₂O)/n(Al₂O₃),thus exposing more pores and improving the catalytic performance,and the size of SAPO-11 molecular sieve can be reduced by adding heterogeneous crystal seeds.Compared with the molecular sieves synthesized under other conditions,the specific surface area,pore volume and acid content were increased.The SAPO-11-seed-200 molecular sieves synthesized at high n(H₂O)/n(Al₂O₃) ratio,heterogeneous seeds and high crystallization temperature had the smallest particle size,the largest specific surface area and pore volume,and the highest acid amount.The catalytic activity and the skeletal isomerization selectivity of 1-hexene isomerization were better than those of other molecular sieves.