首页|Green synthesis of SAPO-34 molecular sieve using rice husk ash as a silica source:Evaluation of synthesis and catalytic performance parameters in methanol-to-olefin reaction
Green synthesis of SAPO-34 molecular sieve using rice husk ash as a silica source:Evaluation of synthesis and catalytic performance parameters in methanol-to-olefin reaction
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NSTL
Reducing synthesis costs in the petrochemical industry leads to decreasing financial value of final products from raw materials.In this paper,SAPO-34 molecular sieve as a main catalyst of methanol-to-olefin process is newly synthesized by rice husk.The silica source of SAPO-34 synthesis is achieved from this agricultural waste material by calcination and leaching methods with the purity of 97% based on XRF analysis.Between the series of samples synthesized,the sample with the highest crystallinity and textural properties is obtained by Si = 0.6 M concentration and hydrothermal synthesis at 200℃ for 18 h which has been proved by XRD,SEM,BET,EDX and NH3-TPD analyses.Also,this sample showed that has relatively higher selectivity toward light olefins compared to other samples.In the case of operating conditions,using methanol/water(20 wt%)instead of pure methanol as feed increased light olefins selectivity and reached the maximum value of 83.5% at 375 ℃,however,highest light olefins mass(26 wt%)from the consumed feed acquired at 425 ℃.
NSTL
