Preparation and characterization of Ni–Zr–O nanoparticles and its catalytic behavior for ethane oxidative dehydrogenation
Preparation and characterization of Ni–Zr–O nanoparticles and its catalytic behavior for ethane oxidative dehydrogenation
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DOI：
10.1016/j.apsusc.2012.01.120
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发表时间：
2012-03
影响因子：
6.7
通讯作者：
Ying Wu;Jing Gao;Yiming He;Tinghua Wu
中科院分区：
文献类型：
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作者：
Ying Wu;Jing Gao;Yiming He;Tinghua Wu
采用改进的溶胶-凝胶法制备了不同Zr含量的Ni-Zr-O纳米粒子，并通过X射线衍射（XRD）、扫描/高分辨透射电子显微镜（SEM/HRTEM）、BET比表面积分析、H2-TPR、XPS和O2-TPD等手段对其进行了表征。以乙烷氧化脱氢制乙烯反应为评价指标，考察了样品的催化性能。结果表明，Zr的掺杂影响了催化剂的晶胞参数和化学环境，表明Ni和Zr之间存在较强的相互作用。这种相互作用对减少还原性和吸附氧物种的分布起着重要作用，从而影响它们的催化性能。在10% Ni-Zr-O催化剂上，乙烯转化率和乙烯选择性分别为60%和66%，乙烯收率最高。
Ni–Zr–O nanoparticles with various Zr contents were prepared by a modified sol–gel method and characterized by X-ray diffraction (XRD), scanning/high-resolution transmission electron microscope (SEM/HRTEM), BET surface area analysis, H2temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS) and O2temperature-programmed desorption (O2-TPD). The oxidative dehydrogenation of ethane (ODHE) to ethylene was applied to evaluate catalytic performance of the samples. The results show that the doping of Zr affected the cell parameter and the chemical environment of the catalysts, indicating the existence of strong interaction between Ni and Zr. The interaction plays an important role in the lessened reducibility and the distribution of adsorbed oxygen species, consequently influence their catalytic performance. The best yield to ethylene was obtained over the 10% Ni–Zr–O catalyst with 60% ethane conversion and 66% ethylene selectivity.