Synthesis of siliceous mordenite from system free of amine

摘要

The stability phase area for giving rise to mordenite in the absence amine butrnwith fluoride was researched. Compared with the system without fluoride in ref , the area ofrnproducing mordenite is broadened and the area of quartz obtained is reduced. Therncrystallization region towards ZSM-5 and ferrierite are no longer formed. The action ofrnfluoride anion in favoring the crystallization of mordenite is clearly shown. When F-/ SiO_2rnratio is above 0.10, as the F-/ SiO_2 ratio increases the SiO_2/Al_2O_3 ratio of product rise andrnquartz is no longer formed. It clearly shows the marked action of fluoride anion in directingrnthe system towards the formation of siliceous mordenite.