封装型 Pd@S-1 催化剂中 Pd 状态对低浓度甲烷催化氧化性能的影响

作者：Chen Xiaomai; Shi Xuefeng; Liu Meiyin; Wang Zikun; Ye Daiqi; Wu Junliang^*

来源：Acta Scientiae Circumstantiae, 2023, 43(3): 394-404.

DOI：10.13671/j.hjkxxb.2022.0229

• methane combustion
• Pd state
• Pd-based catalysts
• zeolites-encapsulation

Pd catalyst encapsulated in S-1 zeolite（Pd@S-1）exhibits high activity and stability in methane combustion，and the state of Pd is one of the important factors affecting the catalytic performance of Pd@S-1. In this paper，Pd@S-1 catalyst was synthesized by an ethylenediamine-assisted in-situ encapsulation method，and the effect of Pd state on methane combustion was investigated by adjusting the atmosphere for catalyst post-treatment. Catalytic performance evaluation showed that Pd@S-1-H2（i. e. Pd@S-1 pretreated in H2）catalyst exhibited higher activity with a full conversion temperature（T100）of 390 ℃ by simply switching from conventional calcination（in air）to H2 reduction. Catalyst characterization showed that the improved catalytic activity of Pd@S-1-H2 was mainly attributed to the decreasing of Pd particle size（by H2 reduction）leading to an increased density of active Pd species，as well as the increasing of reactive oxygen species. In addition，the Pd@S-1-H2 catalyst possessed excellent water resistance，whereas the Pd@S-1-Air catalyst（i.e. Pd@S-1 calcined in air）was seriously deactivated in the presence of water. ? 2023 Science Press.

• 单位
  华南理工大学