Synthesis of ZSM-35 zeolites and catalytic cracking of n-heptane to olefin
Catalytic cracking of alkanes to produce olefin has received extensive attention.However,the yield and selectivity of olefinremains a challenge.The spherical ZSM-35-0.01CTAB zeolites were prepared by hydrothermal synthesis using pyrrolidine(PYR)and cetyltrimethyl ammonium bromide(CTAB)as double templates in this paper.The specific surface area and pore volume of ZSM-35-0.01CTAB zeolite increased from 309 m2/g and 0.19 m3/g to 340 m2/g and 0.24 m3/g,respectively.Due to the interaction between PYR and CTAB,which was conducive to the mass transfer of intermediates.Due to the interaction between PYR and CTAB,it was beneficial to the mass transfer of intermediates.The yield of C2=～C4=increased to 37.05%during the catalytic cracking of n-heptane compared to ZSM-35(27.68%)and ZSM-35-0.005CTAB(32.19%).This new synthesis strategy provided an effective way to adjust the morphology and size of ZSM-35 zeolite and a new theoretical guidance in the process of alkane cracking.
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