Coatings of active and heat-resistant cobalt-aluminium xerogel catalysts

Open-cell foams coated by Ni/X/Al hydrotalcite-type derived catalysts (X = Ce, La, Y) for CO2 methanation

“…By comparing Ni-CeO2-ZrO2 and NiO-Al2O3 coated on Al [22] and Ni [30] foams, respectively, with their pelletized bed counterparts, a lower temperature increase in the bed is observed for the structured catalysts, while the productivity or activity is similar than for pelletized catalysts. In some cases, the amount of catalyst in the coating may be responsible for the low activity, as reported for NiCrAl foams (450 to 1200 μm cell size, 130 to 45 ppi) coated by a Co-Al2O3 xerogel [31]. Actually, Ricca et al reported that an Al foam coated by a 5 wt.% Ni/CeO2-ZrO2 catalyst outperforms a pelletized catalyst due to a more effective heat transfer from warmer to colder areas in the bed [32]; however, in comparison to a SiC honeycomb monolith, it shows a lower heat transfer due to the lower effective thermal conductivity of the foam, which is made by large pores (20 ppi Al foam).…”

Highly Active Sm2O3‐Ni Xerogel Catalysts for CO2 Methanation

“…In terms of stability, particularly for high temperature reactions, xerogel catalysts are a promising, yet seldom investigated alternative as compared to impregnated and precipitated catalysts. The homogenous sol‐gel approach allows a strong interaction of the support and the active component due to a partial encapsulation usually resulting in a high sinter stability …”