| La(OH)3和 La2O2CO3纳 米 棒 的 合 成 及 其 催 化 Claisen-Schmidt缩合反应性能简 |
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| 引用本文： | 王非,塔娜,李勇,申文杰. La(OH)3和 La2O2CO3纳 米 棒 的 合 成 及 其 催 化 Claisen-Schmidt缩合反应性能简[J]. 催化学报, 2014, 35(3): 437-443. DOI: 10.1016/S1872-2067(14)60008-5 |
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| 作者姓名： | 王非 塔娜 李勇 申文杰 |
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| 作者单位： | 中国科学院大连化学物理研究所催化基础国家重点实验室, 辽宁大连116023 |
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| 基金项目： | supported by the National Natural Science Foundation of China (20923001,21025312);the National Basic Research Program of China (973 Program,2013CB933100)~~ |
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| 摘 要： | 通过调节溶液的pH值，在水热条件下合成出长径比为2-45的La（OH）3纳米棒. 对水热合成过程中间体的结构演变分析，发现高碱度有利于小尺寸晶核的形成，La（OH）3晶体结构的各向异性导致这些晶种沿着C轴方向生长，进而形成纳米棒结构. 将La（OH）3纳米棒前驱体于773 K焙烧可以得到长径比为2-20的La2O2CO3纳米棒. 随着长径比的增加，La2O2CO3纳米棒暴露的（110）晶面逐渐增加，La3+-O2-碱性位的数目也从0.08增加到0.24 mmol/g. 因此，在Claisen-Schmidt缩合反应中，La2O2CO3纳米棒催化剂上的反应速率随着长径比的增加而逐渐增大.
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| 关 键 词： | 氢氧化镧 碳酸氧镧 纳米棒 晶面 碱性 Claisen-Schmidt缩合反应 |
| 收稿时间： | 2013-11-09 |
La(OH)3 and La2O2CO3 nanorod catalysts for Claisen-Schmidt condensation |
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| Fei Wang,Na Ta,Yong Li,Wenjie Shen. La(OH)3 and La2O2CO3 nanorod catalysts for Claisen-Schmidt condensation[J]. Chinese Journal of Catalysis, 2014, 35(3): 437-443. DOI: 10.1016/S1872-2067(14)60008-5 |
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| Authors: | Fei Wang Na Ta Yong Li Wenjie Shen |
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| Affiliation: | State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China |
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| Abstract: | La(OH)3 nanorods of 15 nm diameter and up to 700 nm long were synthesized using different pH values of the solution used in the hydrothermal synthesis. A more alkaline solution favored the formation of tiny La(OH)3 nuclei, which grew along the c-axis due to their anisotropic nature and led to the formation of rod-shaped crystals. Calcination of the La(OH)3 nanorods at 773 K gave La2O2CO3 nanorods. Their basic properties were correlated with their size. As the aspect ratio increased from 2 to 20, the basic sites increased from 0.08 to 0.24 mmol/g, which was due to a higher exposure of (110) planes. In the catalysis of the condensation reaction of benzaldehyde with acetophenone, the reaction rate was correlated with the number of La3+-O2- pairs on the exposed (110) facets of the La2O2CO3 nanorods. |
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| Keywords: | La(OH)3 La2O2CO3 Nanorod Crystal facet Basicity Claisen-Schmidt condensation |
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