摘要
使用不同硅铝比的HZSM-5分子筛制备了系列的双功能复合催化剂Zr/HZSM-5,采用X射线衍射(XRD)、氨气程序升温脱附(NH3-TPD)、傅里叶红外光谱(FT-IR)和N2物理吸附等技术对催化剂进行了表征,并在固定床反应器中考察了HZSM-5分子筛硅铝比和反应条件对催化剂在苯与合成气烷基化制芳烃反应中的催化性能的影响。结果表明:随着硅铝比的增加,分子筛总酸量和强酸量均减少,反应过程中苯的转化率和对二甲苯的选择性均呈现先升高后降低的趋势,当硅铝比为200时,催化效果最好;随着反应温度的升高,苯的转化率先升高后降低,CO的转化率先下降后上升,对二甲苯的选择性保持下降的趋势;反应温度控制在350~400℃之间最为合适;随着苯的空速增加,苯的转化率、对二甲苯的选择性均先上升后下降,CO的转化率略微上升,苯的质量空速控制在1h-1时催化效果最佳。
A series of bifunctional composite catalysts Zr/HZSM-5 were prepared using HZSM-5 molecular sieves with different silica-alumina ratios and characterized by XRD, NH3-TPD, FT-IR and N2 physical adsorption. The effects of the silica-alumina ratio of HZSM-5 molecular sieve and the reaction conditions on the catalytic performance of the catalysts in the alkylation reaction of benzene with syngas to synthesize aromatics were investigated in a fixed bed reactor. The results show that with the increase of silica-alumina ratio, the amounts of total acid and strong acid in the molecular sieve decrease, and the conversion of benzene and the selectivity of para-xylene first increase and then decrease, and the optimal silica-alumina ratio is 200;with the increase of reaction temperature, the conversion of benzene first increases and then decreases, and the conversion of CO decreases first and then rises, while the selectivity of para-xylene keeps decreasing;the most suitable reaction temperature is 350-400°C;as the space velocity of benzene increases, the conversion of benzene and the selectivity of p-xylene first increase and then decrease, while the conversion of CO increases slightly, and the optimal weight hourly space velocity of benzene is 1 h^-1.
作者
于波
丁传敏
刘平
张侃
王俊文
马立超
高碧泽
李宇峰
薛亚楠
YU Bo;DING Chuan-ming;LIU Ping;ZHANG Kan;WANG Jun-wen;MA Li-chao;GAO Bi-ze;LI Yu-feng;XUE Ya-nan(College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China;State Key of Laboratory of Coal Conversion,Institute of Coal Chemistry of CAS,Taiyuan 030001,China)
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2019年第4期24-29,共6页
Natural Gas Chemical Industry
基金
国家自然科学基金(21706178
21603256)
山西省自然科学基金(201801D221074
201801D121058)
关键词
双功能复合催化剂
苯
合成气
烷基化
芳烃合成
对二甲苯
bifunctional composite catalyst
benzene
syngas
alkylation
aromatics synthesis
p-xylene
