| H(M)ZSM-5杂原子分子筛的表面酸性和裂解催化行为 |
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| 引用本文： | 蒋大振,肖丰收,刘子阳,徐如人.H(M)ZSM-5杂原子分子筛的表面酸性和裂解催化行为[J].高等学校化学学报,1988,9(5):475. |
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| 作者姓名： | 蒋大振 肖丰收 刘子阳 徐如人 |
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| 作者单位： | 吉林大学化学系 |
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| 摘 要： | 用IR和ITPD技术研究了H(Al)ZSM-5、H(Ga)ZSM-5和H(Fe)ZSM-5杂原子分子筛的表面酸性。结果表明,这些分子筛表面既存在B酸中心,也存在L酸中心,但是就两种酸的表面浓度比值CL/CB而言,H(Ga)ZSM-5和H(Fe)ZSM-5要比H(Al)ZSM-5高得多。在十五烷裂解时,L酸中心起的作用可能更大。
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| 关 键 词： | 杂原子分子筛 表面酸性 裂化 |
| 收稿时间： | 1986-11-28 |
Surface Acidic and Catalytic Properties of H(M=Al, Ga, Fe)ZSM-5 Zeolite |
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| Jiang Dazhen,Xiao Fengshou,Liu Ziyang,Xu Ruren.Surface Acidic and Catalytic Properties of H(M=Al, Ga, Fe)ZSM-5 Zeolite[J].Chemical Research In Chinese Universities,1988,9(5):475. |
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| Authors: | Jiang Dazhen Xiao Fengshou Liu Ziyang Xu Ruren |
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| Institution: | Department of Chemistry, Jijin University, Changchun |
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| Abstract: | The surface acidities and catalytic activities of some trivalent heteroatom-containing H(M)ZSM-5 (M=A1, Ga, Fe) zeolite have been studied by means of TPD, IR and cracking of n-pentadecane.The results indicate that Bronsted and Lewis acidic sites are present in these zeolites but the CL/CB on the surfaces of H(Ga)ZSM-5 and H(Fe)ZSM-5 are more higher than that on the surface of H(Aj)ZSM-5. Besides, there exist in the order of the acidic strength H(Al)ZSM-5>H(Ga)ZSM-5>H(Fe)ZSM-5. Cracking activities have been found to be dependent on the heteroatom in the framework of the zeolite. The normalized activity and the selectivity of gas-oil increase in the order as H(Ga)ZSM-5>H(Al)ZSM-5>H(Fe)ZSM-5. These results suggest that the Lewis acidic site play an important part in the cracking of n-pentadecane. |
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| Keywords: | Heteroatom zeolites Surface acid Cracking |
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