A series of nitrogen-doped CoAlO(N-CoAlO)were constructed by a hydrothermal route combined with a controllable NH3 treatment strategy.The effects of NH3 treatment on the physico-chemical properties and oxidation activities of N-CoAlO catalysts were investi-gated.In comparison to CoAlO,a smallest content decrease in surface Co3+(serving as active sites)while a largest increased amount of surface Co2+(contributing to oxygen species)are obtained over N-CoAlO/4h among the N-CoAlO catalysts.Meanwhile,a maximum N dop-ing is found over N-CoAlO/4h.As a result,N-CoAlO/4h(under NH3 treatment at 400℃for 4 hr)with rich oxygen vacancies shows optimal catalytic activity,with a T9o(the tempera-ture required to reach a 90％conversion of propane)at 266℃.The more oxygen vacancies are caused by the co-operative effects of N doping and suitable reduction of Co3+for N-CoAlO/4h,leading to an enhanced oxygen mobility,which in turn promotes C3H8 total oxi-dation activity dominated by Langmuir-Hinshelwood mechanism.Moreover,in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTs)analysis shows that N doping facilities the decomposition of intermediate species(propylene and formate)into CO2 over the catalyst surface of N-CoAlO/4h more easily.Our reported design in this work will pro-vide a promising way to develop abundant oxygen vacancies of Co-based catalysts derived from hydrotalcites by a simple NH3 treatment.

Enhui Wu;Daifeng Lin;Yinye Chen;Xiaoshan Feng;Kui Niu;Yongjin Luo;Baoquan Huang;Jianbin Qiu;Qingrong Qian;Qinghua Chen

Fujian Key Laboratory of Pollution Control&Resource Reuse,Fujian Normal University,Fuzhou 350007,China;College of Environmental Science and Engineering,Fujian Normal University,Fuzhou 350007,China

环境科学学报（英文版）

[1]Enhui Wu;Daifeng Lin;Yinye Chen;Xiaoshan Feng;Kui Niu;Yongjin Luo;Baoquan Huang;Jianbin Qiu;Qingrong Qian;Qinghua Chen-.N-doped CoAl oxides from hydrotalcites with enhanced oxygen vacancies for excellent low-temperature propane oxidation)[J].环境科学学报（英文版）,2022(06):79-89

hydrotalcites,CoAlO,T9o,Co3+for

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