Low‐temperature total oxidation of methane by pore‐ and vacancy‐engineered NiO catalysts. Issue 6 (8th March 2022)

• Record Type: Journal Article
• Authors: Shu, Yuan; Wang, Mengyao; Duan, Xiaolan; Liu, Dandan; Yang, Shize; Zhang, Pengfei
• Is Part Of: AIChE journal. Volume 68:Issue 6(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-08
• Subjects: mechanochemistry‐assisted method -- mesoporous metal oxides -- methane activation -- methane combustion -- NiO catalyst; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; 660.28
• DOI: 10.1002/aic.17664
• Languages: English
• ISSNs: 0001-1541

Abstract

Abstract: Designing methane combustion catalysts operated under low temperature (<400°C) remains a huge challenge, especially for noble‐metal–free catalytic systems. With NaCl as a crystalline scaffold, NiO catalyst with abundant oxygen vacancies and an ultra‐high–specific surface area of 181 m 2 g −1 is obtained. The mesoporous NiO exhibits outstanding CH4 combustion performance ( T 90 = 370°C at the weight hourly space velocity (WHSV) = 20, 000 mL g −1 h −1 ). X‐ray photoelectron spectroscopy (XPS), H2 ‐temperature‐programmed reduction (TPR), kinetic measurements, and O 18 isotope‐labeling experiments together disclose the key role of surface lattice oxygen and reaction mechanism by NiO catalysts. More importantly, the excellent stability of NiO by doping La was obtained (low‐temperature thermal stability: 385°C, 400 h, 4 vol% H2 O).