| SAPO分子筛的二甲苯异构化反应性能研究——酸性和孔结构对其催化性能的影响 |
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| 引用本文： | 胡健,王建伟,田松柏,张昕.SAPO分子筛的二甲苯异构化反应性能研究——酸性和孔结构对其催化性能的影响[J].燃料化学学报,2006,34(6):740-744. |
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| 作者姓名： | 胡健 王建伟 田松柏 张昕 |
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| 作者单位： | Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China |
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| 摘 要： | 采用水热法合成了SAPO-5、SAPO1-1、SAPO-41分子筛，并以间二甲苯异构化反应为模型反应，考察了SAPO-5、SAPO-11、SAPO-41的催化性能；运用XRD、BET、吸附吡啶的FT IR等手段表征了SAPO的结构和酸性。结果表明，在合成投料比相同的情况下，SAPO-11具有最大的较强B酸量，表现出了最好的间二甲苯异构催化活性。SAPO-5因为较强B酸中心数目少，异构催化活性最差。三种分子筛的间二甲苯异构化催化活性和较强B酸中心的分布均呈SAPO-5＜SAPO-41≈SAPO-11顺序排列。较强B酸中心的分布是决定催化剂异构化活性的主要因素。中孔分子筛SAPO-11、SAPO-41孔道直径与对位产物的直径接近，对位选择性比大孔分子筛SAPO-5好。
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| 关 键 词： | SAPO 异构化 B酸 孔道结构 |
| 文章编号： | 0253-2409（2006）06-0740-05 |
| 收稿时间： | 2006-03-22 |
| 修稿时间： | 2006-06-19 |
Isomerization of m-xylene over SAPO molecular sieves: Effects of acidity and pore structure on catalytic performance |
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| HU Jian,WANG Jian-wei,TIAN Song-bai,ZHANG Xin.Isomerization of m-xylene over SAPO molecular sieves: Effects of acidity and pore structure on catalytic performance[J].Journal of Fuel Chemistry and Technology,2006,34(6):740-744. |
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| Authors: | HU Jian WANG Jian-wei TIAN Song-bai ZHANG Xin |
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| Institution: | Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China |
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| Abstract: | Silicoaluminophosphate molecular sieves SAPO-5, SAPO-11 and SAPO-41 were synthesized and characterized by XRD, IR and pyridine adsorption IR. Their catalytic performances in isomerization of m- xylene were investigated. SAPO-11 owns the largest number of acid sites, particularly the strong Brnsted acid sites, and then exhibits the highest activity and selectivity to p-xylene; whereas low activity and selectivity were obtained over SAPO 5 catalyst. The sequence of activity and the number of strong Brnsted acid sites of the SAPOs followed SAPO-5＜SAPO-41≈SAPO-11. Both SAPO-11 and SAPO-41 produce predominantly the p-xylene isomer due to their medium size pores. |
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| Keywords: | SAPO |
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