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Ni/Al2O3 catalysts for CO2 methanation: Effect of silica and nickel loading by Paola Riani; Elena Spennati; Maria Villa Garcia; Vicente Sanchez Escribano; Guido Busca; Gabriella Garbarino is a Engineering article available to read on EtoBox.
What is Ni/Al2O3 catalysts for CO2 methanation: Effect of silica and nickel loading about?
Samples containing from 1 to 33 wt.% of NiO on silica and alumina doped with silica (1 and 20 wt.% silica in the support) have been prepared and characterized by BET, XRD, FT-IR, UV–vis–NIR, FE-SEM, EDXS, and TPR techniques. Catalysts have been pre-reduced in situ before catalytic experiments and data have been compared with Ni/Al2O3 reference sample. Characterization results showed that SiO2 support has a low Ni dispersion ability mainly producing segregated NiO particles and a small amount of dispersed Ni2+ in exchange sites. Instead, for the Si-doped alumina a “surface spinel monolayer phase” is formed by increasing Ni loading and, only when the support surface is completely covered by this layer, NiO is formed. Moreover, H2-TPR results indicated that NiO particles are more easily reduced compared to Ni species. Low loading Ni/SiO2 catalysts show high selectivity and moderate activity for RWGS (reverse Water Gas Shift) reaction, likely mainly due to nickel species dispersed in silica exchange sites, as evidenced by visible spectroscopy. High loading Ni/SiO2 catalysts show both methanation and RWGS but evident short-term deactivation for methanation, attributed to large, segregat
Who reads Ni/Al2O3 catalysts for CO2 methanation: Effect of silica and nickel loading?
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- Author
- Paola Riani; Elena Spennati; Maria Villa Garcia; Vicente Sanchez Escribano; Guido Busca; Gabriella Garbarino
- Publisher
- Elsevier BV
- Published
- 2023
- Language
- EN
- Field
- Engineering (Physical Sciences)