Basalt-Fiber-Based Core-Shell Composites: Synthesis and Use as Catalysts for the Methanation of CO_2 with H_2

摘要

In this work, basalt-fiber-based core-shell catalysts, BF@MxOy (M = Fe, Co, Ni, and Cu) were synthesized by a dip-coating method and used for the reduction of CO2 to CH4 with H-2. In the composites, basalt fiber (BF) served as the core, while Fe, Co, Ni, and Cu coated on BF served as the shell. These core-shell composites were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS), and elemental mapping analysis, as well as Brunauer-Emmett-Teller (BET) surface area measurements. From the results obtained, the added metals in the form of metal oxides are uniformly coated on the BF surface. Among the core-shell composites, BF@NixOy exhibited superior performance for CO2 methanation, with 9 mu mol s(-1) g(-1) of CH4 gas produced at 400 degrees C and a CH4 selectivity of 100%. Above performance was maintained during 24 h. The superior performance was attributed to the high active surface area as well as the inhibition of sintering caused by the effect of the core-shell structure effect between BF and coated metal; this stable catalyst exhibiting the core-shell structure is useful for the reduction of CO2 to CH4 with H-2.