Support Nano‐Co/CeO 2‐δ Catalyst for CO 2 Hydromethanation

Abstract The large‐scale use of fossil fuels had resulted in massive emission of CO 2 and a series of serious environmental problems, which directly threatening human survival and sustainable development. CO 2 is also the abundant carbon resource in C1 family. CO 2 catalytic hydrogenation to CH 4 is one of the effective ways to ultilize CO 2 with low energy and high efficiency, which has been widely concerned in recent years. Suppoted nano‐Co/CeO 2‐δ catalysts were prepared and evaluated their CO 2 hydrogenation performances. XRD, H 2 ‐TPR, H 2 ‐TPD and CO 2 ‐TPD had been conducted to study the physicochemical properties of the prepared Co/CeO 2‐δ catalysts. The Co loading significantly affects the physicochemical properties and CO 2 hydrogenation performances. The active metal Co species were highly diepersed on the CeO 2 support surface. The number of active metal Co species, which formed by H 2 reduction, increased with the increasing of Co loading. And the ability to adsorb and activate the reactant H 2 and CO 2 molecules was also enhanced, which effectively promoted the CO 2 hydrogenation performances. Among of the studied Co/CeO 2‐δ catalysts, the CoCe09 catalyst with Co loading of 9 % showed the best CO 2 catalytic hydrogenation activity. In the reaction temperature of 240–400 °C, the CO 2 conversion and CH 4 selectivity follow the order: CoCe01 2 conversion increases from 30.1 % (CoCe01) to 59.2 % (CoCe09).