Co-assembly of microfibrous-structured Ag@SiO2-Co3O4/Al-fiber catalysts assisted with water-soluble silane coupling agent for catalytic combustion of trace ethylene

作者：Zhang, Qiaofei^*; Li, Jinfeng; Chen, Shilong; Zhu, Chunshan^*; Li, Yakun^*; Zhao, Guofeng

来源：Catalysis Today, 2022, 405-406: 159-167.

DOI：10.1016/j.cattod.2022.06.002

• Catalytic combustion
• Ethylene
• Strong metal-support interaction (SMSI)
• Ag
• Structured catalyst

Microfibrous structured Ag@SiO2-Co3O4/Al-fiber catalyst, used for catalytic combustion of trace ethylene, is tailored with water-soluble silane coupling agent that has functionally specified multi-groups as bidirectional bridging reactant. Hydrothermally synthesized Co(OH)(2)/Al-fiber nanoarrays can be readily functionalized by amine groups via the silanisation reaction to form Co-O-Si bonds, followed by the assembly of Ag nanoparticles onto this microfibrous-structured substrates by coordination interaction. The as-prepared Ag@SiO2-Co3O4/Al-fiber catalyst uses very low Ag loading of only 0.2 wt% but exhibits high activity/stability at high-throughput operation. Ethylene conversion higher than 99 % was achieved at 200 degrees C under dry atmosphere, which shows no signs of deactivation with C2H4 conversion retained at similar to 94 % within 120 h running. Experimental and theoretical studies unanimously revealed that the Ag@SiO2-Co3O4 core-shell structures with strong metal-support interaction favor to bind and dissociate intermediate species during C2H4 oxidation, contributing to high activity of C2H4 oxidation.

• 单位
  河南工业大学