文献类型：期刊文献

英文题名：Effects of A-site cations (Sm, Y, Gd) on methanol oxidation over AMn2O5 mullite catalysts

作者：Lin, Liangzheng[1];Han, Zhitao[1];Jing, Junhao[1];Zhang, Shoujun[2];Sheng, Shaoqin[3];Yin, Sihan[1];Liu, Tingjun[1];Gao, Chuanqiu[1]

机构：[1]Dalian Maritime Univ, Marine Engn Coll, Dalian 116026, Peoples R China;[2]Guangdong Ocean Univ, Sch Elect & Informat Engn, Zhanjiang 524088, Peoples R China;[3]Guangzhou Shipyard Int Co Ltd, Guangzhou 511462, Peoples R China

年份：2026

卷号：406

外文期刊名：FUEL

收录：SCI-EXPANDED(收录号：WOS:001587971200013)、、WOS

基金：This work was supported by Guangdong Province Natural Resources Project (2022-32) , National Natural Science Foundation of China (52271356) .

语种：英文

外文关键词：Catalytic oxidation; Methanol; Mn-based mullite; A -site cations; Reaction mechanism

外文摘要：Manganese-based mullite-type oxides are widely used in VOCs oxidation, and their catalytic performance can be effectively regulated by modifying the A-site elements. Here, a series of Mn-based mullite catalysts (AMn2O5, A = Sm, Y, Gd) with different rare-earth elements at the A-site were synthesized via hydrothermal method and applied for methanol catalytic oxidation. The GdMn2O5 catalyst demonstrated optimal low-temperature activity, achieving 98 % CH3OH conversion at 150 degrees C. Comprehensive characterization results revealed that the largest specific surface area (40.08 m2/g), highest Mn4+/Mn3+ ratio (0.33), maximum Oads/Olat ratio (1.07), highest concentration of oxygen vacancy and enhanced surface oxygen mobility collectively contributed to the superior catalytic performance of GdMn2O5. In situ DRIFTS was employed to investigate the intermediate species and catalytic mechanism of GdMn2O5 during methanol oxidation. This study provides an important theoretical basis for the rational design of AMn2O5 catalysts and the catalytic oxidation of methanol by fully leveraging the rare earth cation effect, modification, and optimization.