A highly effective Ni-modified MnOx catalyst for total oxidation of propane: the promotional role of nickel oxide

作者：Xie, Yujie; Guo, Yun; Guo, Yanglong; Wang, Li; Zhan, Wangcheng; Wang, Yunsong; Gong, Xueqing; Lu, Guanzhong^*

来源：RSC Advances, 2016, 6(55): 50228-50237.

DOI：10.1039/c6ra09039g

• NANOCRYSTALLINE COBALT OXIDE
• VOLATILE ORGANIC-COMPOUNDS
• MANGANESE OXIDES
• COMPOSITE OXIDES
• DEEP OXIDATION
• CO OXIDATION
• COMBUSTION
• METAL
• PALLADIUM
• BENZENE

Nickel promoted manganese oxide (MnNiOx) was prepared by the co-precipitation method and used as a catalyst for propane deep oxidation. The results show that the doping of Ni can effectively improve the catalytic performance of MnOx for propane total oxidation, and when Ni/Mn is 0.2, the MnNi0.2Ox catalyst exhibits the highest catalytic activity, for instance, the reaction temperature of 90% propane conversion (T-90) was only similar to 240 degrees C, and it demonstrates good thermal stability in the operation at temperatures alternating between 220 degrees C and 350 degrees C. It was found that an Mn-Ni-O solid solution can be formed by adding a moderate Ni amount into MnOx, resulting in changes in catalytically active sites by the synergetic interaction of Mn-Ni, such as a higher surface concentration of Mn4+ and oxygen vacancies, higher oxygen mobility and better reducibility. And the outstanding catalytic property of MnNi0.2Ox can be also related to its high surface area. Furthermore, the in situ DRIFT technique was used to investigate the reaction process of propane oxidation over the MnOx and MnNi0.2Ox catalysts, and the results suggest that the reaction mechanism is hardly changed after Ni doping in MnOx.

• 出版日期2016
• 单位华东理工大学