张金赫,张昌武,王新鸽,程家威,石磊.自水解驱动PtZn/纳米AlN催化剂的合成及其丙烷脱氢性能研究[J].分子催化,2021,35(5):395-403 |
自水解驱动PtZn/纳米AlN催化剂的合成及其丙烷脱氢性能研究 |
Self-hydrolysis-driven Synthesis of Nanocrystalline Aluminum Nitride Supported Platinum-Zinc Catalyst for Propane Dehydrogenation |
投稿时间:2021-06-23 修订日期:2021-07-19 |
DOI:10.16084/j.issn1001-3555.2021.05.001 |
中文关键词: 丙烷 催化脱氢 氮化铝 自水解 Pt-Zn簇 |
英文关键词:propane catalytic dehydrogenation aluminum nitride self-hydrolysis PtZn cluster |
基金项目:国家自然科学基金项目(21872013) |
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中文摘要: |
采用纳米晶氮化铝(n-AlN)做载体,等体积浸渍法制备了系列PtM/n-AlN催化剂,其中M为Zn、Sn、In、Ga中的一种.丙烷脱氢性能测试显示Zn是最优助剂,同步提升了Pt/n-AlN催化剂的活性、选择性和稳定性.X射线粉末衍射(XRD)、扫描电镜(SEM)和N2物理吸附等手段证实水溶液浸渍会导致n-AlN表面水解,刻蚀出大量介孔空间,Zn助剂加剧了n-AlN表面水解,显著促进Pt的分散.球差校正扫描透射电镜(AC-STEM)结合X射线光电子谱(XPS)披露1~2 nm的低维Pt-Zn纳米簇是PtZn/n-AlN催化剂活性相. |
英文摘要: |
Using nanocrystalline aluminum nitride (n-AlN) as support, a series of PtM/n-AlN catalysts were prepared by incipient impregnation method, where M is one of Zn, Sn, In, and Ga. Catalytic test in propane dehydrogenation showed that zinc was the best promoter, which simultaneously enhancedthe activity, selectivity and stability of Pt/n-AlN catalyst in propane dehydrogenation. X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and N2 physical adsorption revealed that aqueous solution impregnation triggered the hydrolysis of n-AlN surface, and etched a large amount of mesoporous space. Also, zinc promoter accelerated such a process, and remarkably promoted the dispersing state of platinum. Aberration-corrected scanning transmission electron microscopy (AC-STEM) combined with x-ray photoelectron spectroscopy (XPS) disclosed that the low-dimensional Pt-Zn alloy clusters with a size of 1~2 nm were catalytically active phases of the PtZn/n-AlN catalyst. |
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