posted on 2022-01-14, 16:34authored byYaru Zhang, Wenjie Yan, Haifeng Qi, Xiong Su, Yang Su, Xiaoyan Liu, Lin Li, Xiaofeng Yang, Yanqiang Huang, Tao Zhang
Strong
metal–support interactions (SMSIs) play a crucial
role in the catalytic performance of supported metal catalysts. Researchers
hypothesize that there is a migration of the support over preexisting
metal nanoparticles during pretreatment. In the present work, a distinct
mechanism of generating an SMSI by the co-reduction of the oxide interphase
is evaluated over Ru/TiO2 catalysts. Formation of the RuxTi1–xO2 oxide interphase is augmented in a facile manner by increasing
the calcination temperature over the Ru/TiO2 catalysts,
whereas increasing the encapsulation of the TiOx overlayer on metallic Ru nanoparticles occurs in the subsequent
reduction of this oxide interphase. In contrast, the SMSI generated
by the conventional mechanism is highly suppressed over the RuO2/TiO2 phase calcined at low temperatures. Because
of this improved SMSI on a Ru/TiO2 catalyst, the catalyst
exhibits an enhanced activity in CO2 methanation with 100%
CH4 selectivity. The findings suggest a means of facilitating
SMSI generation by the co-reduction mechanism and offer an alternative
pathway to modulating the catalytic properties of supported metal
catalysts.