Xin Chang

Jan 2, 2024 | nature.com | Zhi-jian Zhao |Xin Chang

AbstractIn heterogeneous catalysis, the catalytic dehydrogenation reactions of hydrocarbons often exhibit a negative pressure dependence on hydrogen due to the competitive chemisorption of hydrocarbons and hydrogen. However, some catalysts show a positive pressure dependence for propane dehydrogenation, an important reaction for propylene production. Here we show that the positive activity dependence on H2 partial pressure of gallium oxide-based catalysts arises from metastable hydride mediation.

Dec 14, 2023 | mdpi.com | Xingyi Wang |Xin Chang |Yun Jiang |Yintong Guo

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Apr 11, 2023 | nature.com | Zhi-jian Zhao |Wei Qing Wang |Xin Chang

AbstractRedox catalysts play a vital role in chemical looping oxidative dehydrogenation processes, which have recently been considered to be a promising prospect for propylene production. This work describes the coupling of surface acid catalysis and selective oxidation from lattice oxygen over MoO3-Fe2O3 redox catalysts for promoted propylene production. Atomically dispersed Mo species over γ-Fe2O3 introduce effective acid sites for the promotion of propane conversion.

Mar 27, 2023 | nature.com | Xin Chang |Zhi-jian Zhao

AbstractGeometrically isolated metal atoms in alloy catalysts can target efficient and selective catalysis. However, the geometric and electronic disturbance between the active atom and its neighbouring atoms, that is, diverse microenvironments, makes the active site ambiguous. Herein, we demonstrate a methodology to describe the microenvironment and determine the effectiveness of active sites in single-site alloys.