Effect of water on stability of |HZSM-5 and product distribution in two-stage gasoline synthesis from syngas
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摘要: 模拟两段法合成汽油工艺的反应条件（360℃、2MPa），通过控制甲醇的脱水量或在该气氛下对HZSM-5进行水热预处理，考察了水对催化剂稳定性及油相产物的影响。XRD、BET、FT-IR、SEM和NH3-TPD等表征手段表明水热预处理后的分子筛具有晶粒小、中孔多和酸强度低等特点，能显著提高汽油收率和异构烷烃选择性。甲醇在HZSM-5分子筛上发生脱水反应，产生的水热气氛造成强酸中心失活。Abstract: The effects of water on the stability of the catalyst and the product distribution were investigated through controlling the amount of water dehydrated from methanol or using HZSM5 pretreated by hydrothermal method at the analogous atmosphere of gasoline synthesis in two-stage process（360℃， 2MPa）. Physicochemical properties of the zeolite were characterized by XRD, BET, FT-IR, SEM, and NH3-TPD. The results showed that HZSM-5 pretreated by hydrothermal method had smaller crystal size, more mesoporous, and moderate acid sites, which in all result in the enhancement of gasoline yield and the selectivity to iso-paraffins. The steam generated during methanol dehydration led to the deactivation of strong acid over HZSM-5 zeolite.
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Key words:
- water /
- HZSM-5 /
- two-stage gasoline synthesis /
- iso-paraffins
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