吴超,季东,董鹏,李红伟,李贵贤.硼对HZSM-5分子筛酸性和择形性的影响[J].分子催化编辑部,2019,33(6):524-530
硼对HZSM-5分子筛酸性和择形性的影响
The Effect of Boron on HZSM-5 Zeolite Acidity and Shape Selectivity
投稿时间:2019-11-10  修订日期:2019-12-08
DOI:
中文关键词:  甲苯  对二甲苯  酸性  选择性  烷基化
英文关键词:toluene  p-xylene  acidity  selectivity  alkylation
基金项目:甘肃省自然科学基金(18JR3RA143)
作者单位E-mail
吴超 兰州理工大学 石油化工学院, 甘肃 兰州 730050  
季东 兰州理工大学 石油化工学院, 甘肃 兰州 730050  
董鹏 兰州理工大学 石油化工学院, 甘肃 兰州 730050  
李红伟 兰州理工大学 石油化工学院, 甘肃 兰州 730050  
李贵贤 兰州理工大学 石油化工学院, 甘肃 兰州 730050 lgxwyf@163.com 
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中文摘要:
      用不同含量的硼对HZSM-5分子筛进行改性,研究硼对HZSM-5酸性和对甲苯甲醇烷基化制对二甲苯反应的影响.通过XRD,SEM,N2物理吸脱附,NH3-TPD和Py-IR对催化剂进行表征,结果表明硼改性的催化剂仅有弱酸位,随着硼含量增加,弱酸位酸量和B/L增加,并且硼改性后在HZSM-5分子筛中产生新的弱B酸位.弱酸位有利于抑制二甲苯异构化反应和二甲苯进一步烷基化反应,提高对二甲苯选择性.实验结果表明随着弱酸酸量的增加,对二甲苯选择性增加,甲苯转化率减小.与HZSM-5相比,1.7% B/HZSM-5催化剂弱酸酸量增加了226%,因此在1.7% B/HZSM-5催化剂上获得98.57%的对二甲苯选择性.
英文摘要:
      The effect of boron on acidity of HZSM-5 and the alkylation of toluene with methanol into p-xylene was studied. The catalyst was characterized by XRD, SEM, N2 adsorption/desorption isotherms, NH3-TPD and Py-IR. The results of characterization indicate that boron-modified catalyst had almost no strong acid but more than weak acid amount of HZSM-5. As the increase of boron content, both weak acidity and B/L were increased, and new weak acidity were formed on HZSM-5. Xylene isomerization reaction and xylene further methylation were inhibited over weak acidity. Experimental data show that with the increase of weak acidity, the selective of p-xylene generally increase and toluene conversion decrease. As compared with HZSM-5, the amount of weak acidity for 1.7B%/HZSM-5 was increased 226%. Thus, 1.7%B/HZSM-5 catalyst showed the selectivity of p-xylene was 98.57%.
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