A new CVD method without vacuum condition（CVDWV）was designed in this study,ithad been found that by modifying the flow rate of the carrier gas（N<sub>2</sub>）and the temperature of sur-face reaction,sil...A new CVD method without vacuum condition（CVDWV）was designed in this study,ithad been found that by modifying the flow rate of the carrier gas（N<sub>2</sub>）and the temperature of sur-face reaction,silicon saturator and sample tube,the amount of silica deposited on the external sur-face of the zeolite could be precisely controlled,The changes in the physicochemical properties ofzeolite,such as pore-opening size,acidity and reaction property were investigated.The results ob-tained showed that:modification of the improved CVD method did not change the internal structureand acidity of the zeolite,but could bring about significant change of pore-opening size and reactionproperty as desired.展开更多
文摘A new CVD method without vacuum condition（CVDWV）was designed in this study,ithad been found that by modifying the flow rate of the carrier gas（N<sub>2</sub>）and the temperature of sur-face reaction,silicon saturator and sample tube,the amount of silica deposited on the external sur-face of the zeolite could be precisely controlled,The changes in the physicochemical properties ofzeolite,such as pore-opening size,acidity and reaction property were investigated.The results ob-tained showed that:modification of the improved CVD method did not change the internal structureand acidity of the zeolite,but could bring about significant change of pore-opening size and reactionproperty as desired.
