摘要
以介孔分子筛SBA-15为载体,采用浸渍法制备了新型负载型MgO/SBA-15催化剂,采用低温N_2吸附-脱附、X射线衍射(XRD)、透射电子显微镜(TEM)、^(29)Si核磁共振(^(29)Si NMR)、NH_3程序升温脱附(NH3-TPD)、CO_2程序升温脱附(CO_2-TPD)等表征手段研究了不同MgO负载量(质量分数)对催化剂的结构、物化性能和催化乙醇合成丁二烯反应活性的影响。研究结果表明,MgO负载量为20%时,所制备的催化剂的活性最好,此时MgO高度分散在载体SBA-15的有序孔道中,形成了Mg-O-Si结构,有利于提高目标产物丁二烯的选择性。该催化剂在温度350℃、进料质量空速2. 64 h^(-1)的反应条件下,可获得最佳催化效果,乙醇转化率最高可达55. 8%,丁二烯选择性可达80. 2%。Mg O/SBA-15催化剂在乙醇法生产丁二烯工艺中具有潜在的应用前景。
The novel MgO/SBA-15 catalysts were prepared via impregnation of magnesium oxide onto the SBA-15 zeolite support. The effect of MgO content on the structure, physic-chemical properties and catalytic performances of catalysts was studied by Brunauer-Emmett-Teller(BET) measurement, X-ray diffraction(XRD), transmission electron microscopy(TEM),^29Si NMR (nuclear magnetic resonance) spectroscopy, NH 3 -TPD(temperature programmed desorption) and CO2 -TPD. It is found that the catalyst with 20% mass fraction of MgO can form well-dispersed MgO in the inner pores of SBA-15 zeolite and the Mg-O-Si structure between MgO and SBA-15, which is beneficial to the production of 1,3-butadiene. Under the optimal reaction conditions of 350 ℃ and feed weight hourly space velocity of 2.64 h^-1 , the best catalytic performance is obtained with the ethanol conversion of 55.8% and the 1,3-butadiene selectivity of 80.2%. The MgO/SBA-15 catalyst has potential applications in the production of butadiene from ethanol.
作者
刘宗章
张彤
徐彧超
姜浩锡
张敏华
Zongzhang;ZHANG Tong;XU Yuchao;JIANG Haoxi;ZHANG Minhua(Key Laboratory for Green Chemical Technology of Ministry of Education,R & D Center for Petrochemical Technology,Tianjin University,Tianjin 300072,China;Collaborative Innovation Center of Chemical Science and Engineering,Tianjin University,Tianjin 300072,China)
出处
《应用化学》
CAS
CSCD
北大核心
2019年第2期176-181,共6页
Chinese Journal of Applied Chemistry
