碱处理对β分子筛催化苯与苯甲醇液相傅-克烷基化反应性能的影响

发布时间：2018-05-28 11:23

  本文选题：β分子筛 + 孔结构　； 参考：《分子催化》2017年03期

【摘要】：采用Na OH水溶液对β分子筛进行碱处理,利用XRD、N_2-Physisorption、XRF、NH_3-TPD及SEM等表征手段,使用苯与苯甲醇为反应物进行傅-克烷基化反应,对碱处理前后β分子筛的物性和反应性能进行了研究.实验结果表明:随着碱处理程度的加深,β分子筛的孔径增大,催化剂外比表面积显著增加,β分子筛的弱酸强度和弱酸总量有所下降,由此带来的反应结果是苯甲醇的转化率显著提高.对于孔径最大的催化剂,在常压下80℃时进行反应,当反应时间为140 min时,苯甲醇的转化率已达到100%,选择性有所提高.
[Abstract]:尾 molecular sieve was treated with NaOH aqueous solution. The physical properties and reaction properties of 尾 molecular sieve were studied by means of XRDX N, XRF NH 3-TPD and SEM. Benzene and benzyl alcohol were used as reactants for Friede-gram alkylation. The experimental results show that with the deepening of alkali treatment, the pore size of 尾 molecular sieve increases, the specific surface area of catalyst increases significantly, and the weak acid strength and the total amount of weak acid of 尾 molecular sieve decrease. As a result, the conversion of benzyl alcohol was significantly increased. For the catalyst with the largest pore size, the conversion of benzyl alcohol has reached 100 and the selectivity has been improved when the reaction time is 140 min and the reaction temperature is 80 鈩，

本文编号：1946515