Synergetic effect of Mn, Ce, Ba, and B modification and moderate desilication of nanostructured HZSM-5 catalyst on conversion of methanol to propylene

Authors : Fatemeh Yahyazadeh SARAVI, Majid TAGHIZADEH

Pages : 1640-1662

View : 11 | Download : 4

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Modified mesoporous HZSM-5 catalysts were prepared by controlled desilication using a mixture of NaOH and TPAOH insert ignore into journalissuearticles values(tetrapropylammonium hydroxide); and impregnation of metals insert ignore into journalissuearticles values(Mn, Ce, and Ba); and metalloid B. The catalytic performances of all prepared catalysts for methanol to propylene insert ignore into journalissuearticles values(MTP); reaction were evaluated in a fixed bed reactor under atmospheric pressure at 480 \textdegree C. The parent and modified catalysts were characterized by XRD, ICP-OES, FE-SEM, NH$_{3}$-TPD, FT-IR, BET, and TGA techniques. The catalyst loaded with 2 wt.% manganese on desilicated HZSM-5 demonstrated the best catalytic performance in terms of the highest selectivity of C$_{2}^{=}$ to C$_{4}^{=}$ olefins insert ignore into journalissuearticles values(about 93%); and about 52% selectivity of propylene at near 99% methanol conversion in the MTP reaction for a long operation insert ignore into journalissuearticles values(264 h);. The improved catalytic performance can be attributed to the high surface area and the formation of mesopores on the zeolite crystals in conjunction with the appropriate acidity.
Keywords : Nanostructured ZSM 5, mesoporous, methanol to propylene, desilication, impregnation