| 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,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） |
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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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