cs7b04327_si_001.pdf (1.49 MB)
Simple Strategy Generating Hydrothermally Stable Core–Shell Platinum Catalysts with Tunable Distribution of Acid Sites
journal contribution
posted on 2018-02-22, 00:00 authored by Houlin Wang, Minghan Liu, Yue Ma, Ke Gong, Wei Liu, Rui Ran, Duan Weng, Xiaodong Wu, Shuang LiuThere are critical needs for platinum
catalysts with high hydrothermal
stability and tunable Pt–acid site proximity, which could not
be achieved via traditional methods. Here, we describe a simple strategy
(SiO2 alumination combined with controlled removal of the
capping agent) through which Pt-based core–shell catalysts
that tolerant both high-temperature steam and boiling water can be
obtained. More importantly, this strategy allows precise control of
the distance between acid sites and Pt; thus, the interfacial electronic
interaction can be cut off without prohibiting the spillover of adsorbed
species. This tunable structure not only helps to unravel the mechanism
of C3H8 oxidation over acidic Pt catalyst but
also increases the N2 selectivity for NOx selective catalytic reduction. Given that the component of
both the “core” and “shell” can be changed
easily, this strategy should have wide application in mechanism exploration
as well as the development of catalysts for various reactions.