characterization and optimization of sapo-34 catalysts synthesized by mixed templates in mto reaction

The effects of templating on the catalytic performance of sapo-34 catalysthave been investigated in conversion of methanol to olefins. sapo-34catalysts were synthesized using a different combination of morphine,tetraethyl ammonium hydroxide (teaoh) and triethylamine (tea) asstructure-directing agents during synthesis of gel with nominal compositionas 1al2o3:1p2o5:0.4sio2:2yteaoh:2xtea:2(1-(x+y))morpholine:70h2o.the different sapo-34 samples were characterized by xrd, sem, ftir,bet, edx and tpd techniques. increasing teaoh in synthesis gel led todecreasing mean crystal size. the catalytic performance of the synthesizedcatalysts was tested in mto reaction at 410?c and a feed whsv of 6.5 1/h.the catalyst synthesized by combination of tri-templates exhibited highestlight olefins yield in 100% methanol conversion. the optimum values(x=0.17, y=0.34) were obtained by central composite design and responsesurface contour plots.