| La-Ce-Cu系列催化剂SO2中毒机理研究 |
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| 引用本文： | 嵇世山,翁端,谭瑞琴,张志强,曹立礼. La-Ce-Cu系列催化剂SO2中毒机理研究[J]. 物理化学学报, 1998, 14(6): 527-533. DOI: 10.3866/PKU.WHXB19980609 |
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| 作者姓名： | 嵇世山 翁端 谭瑞琴 张志强 曹立礼 |
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| 作者单位： | Department of Chemistry,Department of Materiel Science Engineering,Tsinghua University,Beijing 100084 |
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| 基金项目： | 留学回国人员科研资助，清华大学理学院基金 |
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| 摘 要： | 采用NH_4NO_3共熔法合成La－Ce－Cu系列样品，并通过XRD分析了样品的相组成。XRF证明了系列样品组成均为氧缺陷型化合物．用TEM研究了样品的表面结构，发现随着SO_2中毒的加深，Cu向表面偏析与S结合生成新的化合物，导致了原晶体结构的变形，同时证明纯CeO_2不发生S中毒．XPS研究表明：样品La_(.029)Ce_(0.57)Cu_(0.14)O_x中毒后Cu从La_2CuO_4中分解出来并与S结合生成CuSO_4；相应的CeO_2参与了中毒反应，生成Ce_2O_3,整个中毒反应如下：La_2CuO_4＋2CeO_2＋SO_2＝CuSO_4＋La_2O_3＋Ce_2O_3
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| 关 键 词： | La-Ce-Cu催化剂 SO2中毒 结构表征 |
| 收稿时间： | 1997-09-18 |
| 修稿时间： | 1998-01-18 |
Studies of SO_2 Poisoning Mechanism on La-Ce-Cu Catalysts |
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| Ji Shishan, Weng Duan, Tan Ruiqin, Zhang Zhiqiang, Cao Lili. Studies of SO_2 Poisoning Mechanism on La-Ce-Cu Catalysts[J]. Acta Physico-Chimica Sinica, 1998, 14(6): 527-533. DOI: 10.3866/PKU.WHXB19980609 |
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| Authors: | Ji Shishan Weng Duan Tan Ruiqin Zhang Zhiqiang Cao Lili |
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| Affiliation: | Department of Chemistry,Department of Materiel Science Engineering,Tsinghua University,Beijing 100084 |
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| Abstract: | Samples of La-Ce-Cu series were prepared with ammonium nitrate (NH_4NO_3) comelted method and the compositions of the samples were analyzed by XRD, XRF results showed that all the samples were O-defect compounds. The superficial structure were characterized by TEM. It was found that Cu segregates towards the surface and forms a new compound with S with the deepening of SO2 poisoning which causes the distortion of the original crystal structure. It, also showed that pure CeO2 will not be poisoned by sulphur. XPS analysis showed that after poisoning reaction Cu seperates from La2CuO4 and combines with S to form CuSO4. Correspondingly CeO2 participates in the poisoning reaction and forms Ce2O3, i.e.La2CuO4 2CeO2 SO2 = CuSO4 La2O3 Ce2O3 |
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| Keywords: | La-Ce-Cu catalysts SO2 poisoning Structure characterization |
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