LI Xiaohui, ZHENG Qingqing, MI Shuo, et al. Combinatorial modification and catalytic performance of ZSM-5 zeolite by phosphorus and aluminum[J]. CIESC Journal, 2016, (8): 3357-3362.
LI Xiaohui, ZHENG Qingqing, MI Shuo, et al. Combinatorial modification and catalytic performance of ZSM-5 zeolite by phosphorus and aluminum[J]. CIESC Journal, 2016, (8): 3357-3362.DOI: 10.11949/j.issn.0438-1157.20160368.
one of the important shape selective catalysts with high molar ratio of silica to alumina
possesses strong acidity and excellent thermal and hydrothermal stability. The acidity and pore structure of ZSM-5 zeolite were adjusted by combinatorially modifying ZSM-5 molecular sieves with phosphorus and aluminum. Results showed lamellar-structured phosphorus and aluminum deposits on the surface of ZSM-5 zeolite at greater than 10% (mass) load of phosphorus and aluminum
which increased its acidity and formed new mesopores about 10 nm in diameter. Such highly acidic porous structures significantly increased the conversion of n-octane and the propylene yield by more than 20%. When used in catalytic cracking of heavy oil
the yield of oil residual and coke was decreased but the yield of propylene was increased by 1%.