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以不同浓度的H2SO4对膨润土进行改性,得到酸化膨润土催化剂x%H2SO4-BN(x=20,25,30,35,40),通过XRD,BET,FT-IR,Py-IR和NH3-TPD对膨润土的结构和性质进行表征,证明膨润土经酸化后,骨架结构基本没有变化,但是其比表面和孔容有很大的提高,且弱酸位增多.将其用于催化乙醇(EtOH)和叔丁醇(TBA)合成乙基叔丁基醚(ETBE)的醚化反应.结果表明,30%H2SO4-BN催化活性最好,最佳实验条件:催化剂用量为3.5%(催化剂与叔丁醇的质量百分比),反应温度130℃,原料摩尔比(EtOH:TBA)为2∶1.
The bentonite was modified with different concentrations of H2SO4 to get acidified bentonite catalyst x% H2SO4-BN (x = 20,25,30,35,40). XRD, BET, FT-IR, Py-IR and NH3-TPD The structure and properties of bentonite were characterized to prove that the structure of bentonite did not change after acidification, but its specific surface area and pore volume were greatly improved, and the weak acid sites increased.Using it to catalyze EtOH and tert- Etherification reaction of ethyl t-butyl ether (ETBE) with butanol (TBA) .The results showed that the catalytic activity of 30% H2SO4-BN was the best, the optimum experimental conditions were as follows: the catalyst dosage was 3.5% Mass percentage), the reaction temperature is 130 ℃, the molar ratio of raw materials (EtOH: TBA) is 2:1.