| 用磷-稀土元素改性ZSM-5沸石催化剂的催化特性研究 |
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| 引用本文： | 陈连璋,孙多里,王静玉,王祥生.用磷-稀土元素改性ZSM-5沸石催化剂的催化特性研究[J].大连理工大学学报,1986(3). |
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| 作者姓名： | 陈连璋 孙多里 王静玉 王祥生 |
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| 作者单位： | 大连工学院基本有机化工教研室
(陈连璋，孙多里，王静玉)，大连工学院基本有机化工教研室(王祥生) |
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| 摘 要： | 本文用Ｈａｍｍｅｔｔ指示剂法，程序升温脱附法和红外光谱法考察了磷和磷一(?)改性ＺＳＭ－５沸石催化剂表面酸性变化对甲苯歧化催化剂性能影响，认为磷酸与沸石的直接作用,使沸石的强酸中心消失。而磷酸与加入氧化铝担体的ＺＳＭ－５沸石催化剂的相互作用，主要表现为变强酸中心为弱酸中心。通过与催化反应结果关联,看出反应选择性的提高与强酸中心和弱酸中心的比值有关。因此,用磷-PK稀土改性ＺＳＭ－５沸石催化剂上甲苯歧化，对二甲苯选择性提高到92-96%左右．
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| 关 键 词： | 催化剂 磷 改性 沸石 稀土族 歧化反应 反应选择性 红外分光光度法/ZSM-5沸石 程序升温脱附法 Hammett指示剂法 |
An Investigation of Catalytic Character of a ZSM-5 Zeolite Catalyst Modified by Phosphorous-Rare Earth Elements |
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| Chen Lianzhang,Sun Duoli,Wang Jingyu,Wang Xiangsheng.An Investigation of Catalytic Character of a ZSM-5 Zeolite Catalyst Modified by Phosphorous-Rare Earth Elements[J].Journal of Dalian University of Technology,1986(3). |
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| Authors: | Chen Lianzhang Sun Duoli Wang Jingyu Wang Xiangsheng |
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| Institution: | Chen Lianzhang,Sun Duoli,Wang Jingyu,Wang Xiangsheng Department of Petro-Chemical Engineering,DIT |
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| Abstract: | The Hammett indicator, TPD and IR methods are used to study the relation bet- ween the surface acidic properties of a P-La modified ZSM-5 zeolite catalyst and its toluol disproportion catalytic properties. The authors assume that the interaction between phosphoric acid and zeolite causes the disappearance of strong acidic centers. When the alumina carrier is added, the interaction of them causes the change of strong acidic center to weak acidic center. In connection to its catalytic reactivity, the authors find out that there is close relation between the selectivity and the ratio of strong and weak acidic centers. So that the xylene selectivity of toluol disproportion reaction on these ZSM-5 zeolite catalysts modified by phosphorous and rare-earth elements could be increased to 92- 96 %. |
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| Keywords: | catalyst phosphotous modification zeolite rare-earth dispropor- tion reaction reaction selectivity infrared spectrophotometry/ZSM-5 zeolite TPD Hammett indicator |
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