Abstract
Ni-Ce-Zr-Oδ catalysts were prepared via one-pot hydrothermal synthesis. It was found that Ni can be partially incorporated into the Ce-Zr lattice, increasing surface oxygen species. The catalysts possess high surface areas even at high Ni loadings. The catalyst with Ni content of 71.5 wt.% is able to activate CO2 methanation even at a low temperature (200 °C). Its CO2 conversion and methane selectivity were reported at 80% and 100%, respectively. The catalyst was stable for 48 h during the course of CO2 methanation at 300 °C. Catalysts with the addition of medium basic sites were found to have better catalytic activity for CO2 methanation.
Highlights
Catalytic hydrogenation of CO2 has drawn considerable attention due to its potential for the production of methane or other useful hydrocarbons
The results showed that Brunauer–Emmett–Teller (BET) surface areas of the catalysts synthesized are in the range of ca. 145–189 m2 g−1 (Table 1)
Ni-Ce-ZrOδ catalysts were successfully prepared via one-pot hydrothermal synthesis with the maximum Ni loading of up to 71.5 wt.%
Summary
Catalytic hydrogenation of CO2 has drawn considerable attention due to its potential for the production of methane or other useful hydrocarbons. Is consumed, and converted to methane, promoting energy regeneration, and methane can be used as a clean fuel This reaction (Rxn. 1) occurs competitively with reverse water gas shift reaction (Rxn. 2). Ce-Zr mixed oxides were demonstrated as good catalyst support potential for methanation because of their advantages, including good redox properties, high thermal stability, as well as resistance to sintering and coke formation [24,25,26]. According to the literature, loading a high amount of Ni could improve the catalytic activity by offering more adsorption arenas for the migration of intermediate species [27,28,29,30]; high metal loading via the conventional impregnation method often resulted in the low dispersion of the bulk oxide and channel blocking by the formation of bulk metal oxide clusters [31].
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