Modification of effective pore opening of MFI-type zeolite utilizing catalytic cracking of silane

A new method, catalytic silane cracking method, was developed for controlling the effective pore opening of MFI-type zeolite. In this method, silane is cracked catalytically on active sites (acid sites) of MFI-type zeolite to produce methane and ethane, leaving coke containing Si atom on acid sites. This coked sample is calcined in air stream. By this procedure, a mono SiO2 unit is deposited on an acid site. The pore diameter at the position of SiO2 deposit is decreased to about the minimum molecular diameter of carbon dioxide. By this method, the amount adsorbed of benzene was largely decreased, but the amount of CO2 was kept constant.