| ZrO_2／γ－Al_2O_3复合载体的制备及ZrO_2在γ－Al_2O_3表面 |
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| 引用本文： | 韦薇,段连运,汪传宝,谢有畅.ZrO_2／γ－Al_2O_3复合载体的制备及ZrO_2在γ－Al_2O_3表面[J].天然气化工,1994(1). |
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| 作者姓名： | 韦薇 段连运 汪传宝 谢有畅 |
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| 作者单位： | 北京大学物理化学研究所，云南楚雄师专 |
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| 摘 要： | 以ＺｒＣｌ４和γ－Ａｌ２Ｏ２为原料，采用升华－吸附－水解法制得ＺｒＯ２／γ－Ａｌ２Ｏ３复合载体。用ＸＲＤ、ＸＰＳ和ＴＥＭ等技术研究了ＺｒＯ２在γ－Ａｌ２Ｏ２表面上的分散状态。结果表明，ＺｒＯ２在γ－Ａｌ２Ｏ２表面有一分散阈值（０．０６２ｇＺｒＯ２／１００ｍ２γ－Ａｌ２Ｏ３）；当ＺｒＯ３含量低于该阈值时，它以单层或工单层形式存在，当含量高于该阈值时，出现ＺｒＯ２晶相；来发现有体相化合物生成。用升华－吸附－水解法制备复合载体克服了ＺｒＯ２因熔点高难以直接分散的动力学上的困难。
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| 关 键 词： | 复合载体，升华－吸附－水解法ZrO_2分散状态，分散阈值 |
Preparation of ZrO_2/γ-Al_2O_3 complex support and dispersion state of ZrO_2 on γ-Al_2O_3 surface |
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| Wei Wei,Duan Lianyun,Wang Chuanbao,Xie Youchang.Preparation of ZrO_2/γ-Al_2O_3 complex support and dispersion state of ZrO_2 on γ-Al_2O_3 surface[J].Natural Gas Chemical Industry,1994(1). |
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| Authors: | Wei Wei Duan Lianyun Wang Chuanbao Xie Youchang |
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| Abstract: | A sublimation-adsorption-hydrolysis process has been developed for preparation of ZrO2/γ-Al2O3 complex supports from ZrCl4.The dispersion state of ZrO2 on the surface of γ-Al2O3 was investigated by using XRD, XPS and TEM techniques. Based on XRD and XPS analyses of the complex supports, it is concluded that (1) the experimental maximum dispersion capacity of ZrO2 on γ-Al2O3 surface is 0.062g/100g/100m2γ-Al2O3; (2) when ZrO2 content is less than this value, ZrO2 disperses onto the surface of γ-Al2O3 to form a monolayer or submonolayer; (3)crystalline ZrO2 appears when this value is exceeded; (4) no evidence for the formation of bulk compounds was found. The prepration of the complex support by using this method has solved the problem on kinetics that it is difficult for ZrO2 to directly disperse. |
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| Keywords: | complex support sublimation-adsorption-hydrolysis method ZrO_2 dispersion state dispersion threshold |
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