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以硅胶为载体,制备了负载型Cs2.5H0.5PW12O40催化剂。将制备的催化剂用于乙酸与1-丁烯的酯化反应。考察了活性组分负载量、焙烧温度、催化剂用量、反应温度、反应压力、n(1-丁烯)/n(乙酸)、反应时间等因素对乙酸转化率的影响。研究结果表明,在活性组分负载量为40%、焙烧温度为300℃时制备的Cs2.5H0.5PW12O40/SiO2催化剂具有较高的催化活性。随着负载量增大,催化剂孔径、孔容和比表面积减小,催化活性先增加后减小。在反应温度为120℃、压力为1.5 MPa、n(1-丁烯)/n(乙酸)比为3.0、催化剂用量为4%、反应时间为7 h的条件下,乙酸的转化率为87.36%。
Silica gel as support, a supported Cs2.5H0.5PW12O40 catalyst was prepared. The prepared catalyst was used for esterification of acetic acid with 1-butene. The effects of the amount of active components, calcination temperature, catalyst dosage, reaction temperature, reaction pressure, n (1-butene) / n (acetic acid) and reaction time on the conversion of acetic acid were investigated. The results show that the Cs2.5H0.5PW12O40 / SiO2 catalyst prepared at a loading of 40% and a calcination temperature of 300 ℃ has high catalytic activity. With the increase of the loading, the catalyst pore size, pore volume and specific surface area decrease, the catalytic activity first increases and then decreases. Under the conditions of reaction temperature 120 ℃, pressure 1.5 MPa, n (1-butene) / n (acetic acid) ratio 3.0, catalyst dosage 4% and reaction time 7 h, the conversion of acetic acid was 87.36% .