论文部分内容阅读
制备了一系列CO低温氧化的Ce20Cu5NiyOx催化剂,并采用氮气低温物理吸附、X射线衍射、程序升温还原、X射线光电子能谱以及拉曼光谱等手段对催化剂进行表征.结果表明,Ce20Cu5Ni0.4Ox催化剂活性最高.NiO的添加可以使得较多的Cu物种掺杂到CeO2晶格中,通过形成铈镍固溶体产生更多的氧空位.表征结果显示,Ce20Cu5Ni0.4Ox催化剂中存在大量的Cu+,Ce3+及晶格氧,催化剂中的Cu+很容易进入到氧化铈晶格,形成Cu-O-Ce固溶体,从而增强了在还原气氛下晶格氧的释放能力.Ce20Cu5Ni0.4Ox催化剂高的催化活性主要归因于大量Cu+以及形成的Cu-O-Ce和Ni-O-Ce固溶体.
A series of catalysts for the low temperature oxidation of Ce20Cu5NiyOx were prepared and the catalysts were characterized by low temperature physisorption, X-ray diffraction, temperature programmed reduction, X-ray photoelectron spectroscopy and Raman spectroscopy. The results showed that the activity of Ce20Cu5Ni0.4Ox catalyst The highest NiO addition can make more Cu species doped into the CeO2 lattice and produce more oxygen vacancies through the formation of cerium-nickel solid solution.The characterization results show that there are a large amount of Cu +, Ce3 + and lattice in the Ce20Cu5Ni0.4Ox catalyst Oxygen, Cu + in the catalyst can easily enter the cerium oxide lattice to form a Cu-O-Ce solid solution, thereby enhancing the lattice oxygen release ability under a reducing atmosphere. The high catalytic activity of the Ce20Cu5Ni0.4Ox catalyst is mainly attributed to a large amount of Cu + as well as the formed Cu-O-Ce and Ni-O-Ce solid solutions.