引用本文:
杨成, 董庆年, 张静, 任杰, 孙予罕, 谢亚宁, 胡天斗. 铈和镧改性γ-Al2O3担载Pd催化剂的结构效应[J]. 物理化学学报,
2002, 18(02): 170-174.
doi:
10.3866/PKU.WHXB20020216
Citation: Yang Cheng, Dong Qing-Nian, Zhang Jing, Ren Jie, Sun Yu-Han, Xie Ya-Ning, Hu Tian-Dou. The Structural Effect of CeO2 and La2O3 Modified Pd/γ-Al2O3 Catalysts[J]. Acta Physico-Chimica Sinica, 2002, 18(02): 170-174. doi: 10.3866/PKU.WHXB20020216
Citation: Yang Cheng, Dong Qing-Nian, Zhang Jing, Ren Jie, Sun Yu-Han, Xie Ya-Ning, Hu Tian-Dou. The Structural Effect of CeO2 and La2O3 Modified Pd/γ-Al2O3 Catalysts[J]. Acta Physico-Chimica Sinica, 2002, 18(02): 170-174. doi: 10.3866/PKU.WHXB20020216
铈和镧改性γ-Al2O3担载Pd催化剂的结构效应
摘要:
分别以镧-铈、铈-镧顺序浸渍和镧铈共浸渍的方式在γ-Al2O3载体上引入助剂La2O3和CeO2，然后担载Pd制备了一系列催化剂.以甲醇分解为探针反应，采用XRD、EXAFS和XPS对催化剂的体相和表面结构进行表征，用BET法测定比表面积，并进行了吸附态CO的FTIR研究.结果表明,La2O3容易进入CeO2的晶格中，促进了CeO2在γ-Al2O3上的分散.但不同的La2O3、CeO2加入方式对活性组分Pd在改性载体上的分散度、优势暴露面及其与CeO2之间的相互作用产生不同的影响.关联甲醇分解性能测试结果说明,Pd在载体上的高度分散以及Pd和CeO2之间通过界面产生的强相互作用是催化剂具有高活性的关键.
English
The Structural Effect of CeO2 and La2O3 Modified Pd/γ-Al2O3 Catalysts
Abstract:
A series of Pd/γ-Al2O3 catalysts modified by CeO2 and La2O3 were prepared by impregnation method with different La2O3,CeO2 dope manners.Methanol decomposition was used as a probe reaction.The structure of the catalysts was characterized by means of BET,XRD,XPS and FTIR.The results showed that a La2O3 -CeO2 solid solution was facile to form by La3＋ dissolution into CeO2 lattice.The dimension of CeO2 particles decreased,while the dispersion and crystal plane of Pd and the Pd-CeO2 interaction varied with La2O3,CeO2 dope manners.High dispersion of Pd and a strong interaction between Pd and CeO2 were observed on a La2O3 and CeO2 modified Pd/Al2O3 catalyst with La2O3-CeO2 successive dope manner,which resulted in high activity for methanol decomposition.
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