水热改性对Hβ沸石醚化催化性能的影响

Influences of hydrothermal modification on Hβ zeolite catalytic performance in etherification

为了提高Hβ沸石的稳定性,对其进行了水热改性。以乙醇和叔丁醇为原料,在常压条件下,将水热改性Hβ沸石作为催化剂应用于乙基叔丁基醚(ETBE)的合成。考察了水热改性条件对Hβ沸石催化活性、选择性的影响。实验结果表明,适宜的改性条件:水热处理温度为600℃、水热处理时间为2 h、水热处理空速为2.0 h-1,此时目标产物ETBE的收率为40%。将水热改性前后的Hβ沸石进行催化活性、选择性及稳定性对比,结果表明,水热处理的Hβ沸石较未处理的Hβ沸石的催化活性和选择性稍有下降,但其寿命增加了75 h。

A hydrothermal modification was made for Hβ zeolite to improve its catalytic stability.As catalyst,the modified zeolite was applied in the synthesis of ethyl tert-butyl ether （ETBE） with alcohol and tert-butyl alcohol as raw materials under atmospheric conditions.Influences of hydrothermal modification conditions on the catalytic activity and selectivity of Hβ were studied.Results showed that suitable modification conditions were as follows ：treatment temperature was 600 ℃ ,treatment time was 2 h, and space velocity was 2.0 h^-1, under those conditions the ETBE yield was 40%.Activity, selectivity, and stability of the modified catalyst were compared with the untreated one and results showed that although the activity and selectivity decreased a little, the life time of the hydrothermal treated Hβ zeolite was significantly increased by 75 h.