SYNTHESIS AND CHARACTERIZATION OF MESOPOROUS MATERIALS MCM-41

The thick well MCM 41 mesoporous materals were hydrothermally synthesized by novel modification of the gel system used X ray diffraction, nitrogen adsorption, TG DTA, SEM and pyridine temperature programmed desorption(TPD) were used to characterize the synthesized MCM 41 The results showed that all the samples exhibit a typical XRD diffraction of MCM 41 and adsorption isotherm of type Ⅳ The sample had high relative crystallinity, uniform mesopore distribution and high surface areas TG DTA cure showed that the samples were thermally stable The pyridine TPD spectras showed that MCM 41 possesses only some weak and middle strength acid sites The MCM 41 was used as one of active components of the catalysts, The MAT results showed that the cracking activity was lower, but the ratio of diesel to gasoline yield was higher It meant that thick well MCM 41 might be potential for higher selectivity to diesel