In Situ X-ray Diffraction Study of Co–Al Nanocomposites as Catalysts for Ammonia Decomposition
In Situ X-ray Diffraction Study of Co–Al Nanocomposites as Catalysts for Ammonia Decomposition
复制标题
DOI：
10.1021/acs.jpcc.5b02932
复制
发表时间：
2015-07
影响因子：
3.7
通讯作者：
Yingying Gu;Xin-Pu Fu;Peipei Du;D. Gu;Zhao Jin;Yu-ying Huang;R. Si;Liqiang Zheng;Qisheng Song-Qishen
中科院分区：
文献类型：
--
作者：
Yingying Gu;Xin-Pu Fu;Peipei Du;D. Gu;Zhao Jin;Yu-ying Huang;R. Si;Liqiang Zheng;Qisheng Song-Qishen
通过一锅蒸发诱导自组装方法合成了作为活性稳定的氨分解催化剂的Co-Al纳米复合材料。通过粉末X射线衍射（XRD）、X射线吸收精细结构（XAFS）、X射线光电子能谱（XPS）、N2吸附/解吸和透射/扫描电子显微镜（TEM/SEM）等技术对催化剂进行了表征。特别是，在催化反应条件下进行了原位 XRD，发现具有立方结构的金属 Co 最有可能是氨分解的活性晶相；此外，不能排除 CoO 对催化活性的贡献。最重要的是，氧化铝的引入可以显着抑制活性金属Co相的团聚，从而保持钴催化剂的高活性。
Co–Al nanocomposite materials as active and stable catalysts for ammonia decomposition have been synthesized by a one-pot evaporation-induced self-assembly method. The catalysts were characterized by various techniques including powder X-ray diffraction (XRD), X-ray absorption fine structure (XAFS), X-ray photoelectron spectroscopy (XPS), N2 adsorption/desorption, and transmission/scanning electron microscopy (TEM/SEM). Especially, in situ XRD under catalytic reaction conditions was performed, and metallic Co with a cubic structure was identified to be most probably the active crystalline phase for the decomposition of ammonia; also, contribution of CoO to the catalytic activity cannot be excluded. Most importantly, the introduction of alumina can significantly suppress the agglomeration of the active metallic Co phase and thus maintain the high activity of the cobalt catalyst.