Figure 9

Response surface graphs of MFI zeolite crystal size (a) effect of crystallization time and NAOH concentration, (b) effect of aging time and crystallization time, (c) effect of aging time and NAOH concentration, (d) effect of hydrothermal time and hydrothermal temperature, (e) effect of hydrothermal time and NH4F concentration, (f) effect of hydrothermal temperature and NH4F concentration.