Catalytic cracking deposition of methyldiethoxysilane over MFI zeolite was investigated in order to reveal the catalytic cracking behavior of silane. The cracking products were found to be strongly influenced by the cracking temperature and acid sites. Increases of temperature and acid sites were beneficial to catalytic cracking deposition of methyldiethoxysilane in the zeolitic pores, which could effectively reduce the pore size of zeolite. H+ ion exchange on MFI zeolite membranes was used to increase acid sites in the membrane layer. The membranes were further modified by on-stream catalytic cracking deposition of methyldiethoxysilane to improve H2 selectivity. The achieved H2 selectivity over ion-exchanged membranes was much higher than that for MFI zeolite membranes without ion exchange. An ion-exchanged membrane after catalytic cracking deposition modification typically exhibited an H2/CO2 separation factor of 42.6, and a H2 permeance of 2.82 x 10-7mol/m2sPa at 500C.

Catalytic Cracking Deposition of Methyldiethoxysilane for Modification of Zeolitic Pores in MFI/α-Al2O3 Zeolite Membrane with H+ Ion Exchange Pretreatment. Z.Hong, Z.Wu, Y.Zhang, X.Gu: Industrial and Engineering Chemistry Research, 2013, 52[36], 13113-9