Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

作者：Giulia Tuci, Yuefeng Liu, Andrea Rossin, Xiang‐Yun Guo, Charlotte Pham, Giuliano Giambastiani, Cuong Pham‐Huu · 发表于：Chemical Reviews · 年份：2021 · DOI：10.1021/acs.chemrev.1c00269 · 被引用次数：194 · 研究领域：Catalytic Processes in Materials Science、Nanomaterials for catalytic reactions、Catalysis and Hydrodesulfurization Studies

There is an obvious gap between efforts dedicated to the control of chemicophysical and morphological properties of catalyst active phases and the attention paid to the search of new materials to be employed as functional carriers in the upgrading of heterogeneous catalysts. Economic constraints and common habits in preparing heterogeneous catalysts have narrowed the selection of active-phase carriers to a handful of materials: oxide-based ceramics ( e.g. Al 2 O 3, SiO 2, TiO 2, and aluminosilicates–zeolites) and carbon. However, these carriers occasionally face chemicophysical constraints that limit their application in catalysis. For instance, oxides are easily corroded by acids or bases, and carbon is not resistant to oxidation. Therefore, these carriers cannot be recycled. Moreover, the poor thermal conductivity of metal oxide carriers often translates into permanent alterations of the catalyst active sites ( i.e . metal active-phase sintering) that compromise the catalyst performance and its lifetime on run. Therefore, the development of new carriers for the design and synthesis of advanced functional catalytic materials and processes is an urgent priority for the heterogeneous catalysis of the future. Silicon carbide (SiC) is a non-oxide semiconductor with unique chemicophysical properties that make it highly attractive in several branches of catalysis. Accordingly, the past decade has witnessed a large increase of reports dedicated to the design of SiC-based catalysts,...