Enhanced CO2 Methanation Activity of Ni/Anatase Catalyst by Tuning Strong Metal–Support Interactions

By Jian Li, Yaping Lin, Xiulian Pan, Dengyun Miao, Ding Ding, Yi Cui, Jinhu Dong, X. Bao. ACS Catalysis, 2019

180 citations recorded by the source corpus.

Strong metal–support interaction (SMSI) has been widely recognized for platinum-group metals on reducible oxide supports. Herein we report that the catalytic activity of Ni catalyst in CO2 methanation is significantly suppressed over conventional anatase (a-TiO2) support due to the SMSI-induced formation of a titania overlayer around the Ni nanoparticles. Furthermore, CO is the only product . In contrast, the NH3-treatment and H2-treatment of the a-TiO2 support enhance remarkably the activity of Ni, i.e., CO2 conversion increases by 1 order of magnitude and CO2 is hydrogenated almost exclusively to CH4. X-ray photoelectron spectroscopy (XPS), H2 and CO chemisorption, and low temperature electron paramagnetic resonance (EPR) reveal that the enhanced CO2 methanation activity may be related with the  Ti3+ species in the bulk that are generated by reduction treatment, which likely have altered the SMSI between Ni and a-TiO2 support. This simple reduction treatment approach may be applicable to modulate the SM...

Subfields: Catalysis, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/73e4ad47fb610667ed4541a408879949b24ce52b