Ni/CeO₂ catalysts for low‐temperature CO₂ methanation: Identifying effect of support morphology and oxygen vacancy

Abstract

In order to investigate the effect of support morphology and oxygen vacancy on the low temperature catalytic activity of Ni‐based catalyst for CO2 methanation, three Ni/CeO2 catalysts were prepared by impregnation method, in which CeO2 materials with different morphology of flowerlike, nanowire, and bulk were used. The characterization results showed that the morphology of CeO2 exhibited a significant effect on the preferential exposed crystal planes, which led to the change of oxygen vacancy concentration and metal dispersion, resulting in the enhancement of catalytic activity at low temperature. Among all catalysts, the nanowire‐like Ni/CeO2 catalyst (Ni/W) showed the highest CO2 conversion due to its enhanced oxygen vacancy concentration and CO2 adsorption capacity of the catalyst. In situ DRIFTS experiment showed that the intermediate product of Ni/W catalyst reaction route was formate. In a 100 h–400°C–lifetime test, Ni/W catalyst also showed excellent long‐term stability. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

Advances in studies of the structural effects of supported Ni catalysts for CO2hydrogenation: from nanoparticle to single atom catalyst

“…The oxygen vacancy of the support significantly enhances the Ni–support interaction, stabilizes the nickel nanoparticles, promotes the formation of a Ni–support active interface and improves the adsorption of carbon dioxide and hydrogen. 102,103,105,109,129–135 Obviously, the effect of the support cannot be ignored. 136,137 Tsubaki and his co-workers 138 recently reported the preparation of nanoparticle promoted Ni-based bimodal pore catalysts by the impregnation of nickel precursor on SiO 2 , Al 2 O 3 and ZrO 2 nanoparticle modified SiO 2 supports.…”

Morphology‐Dependent Catalysis of CeO2‐Based Nanocrystal Model Catalysts

“…For CeO 2 ‐supported metal catalysts, the morphology effect of CeO 2 support on the metal‐CeO 2 interaction, structure and catalytic performance has been extensively observed on the Au/ CeO 2 , [ 59,120‐124 ] Ag/CeO 2 , [ 94 ] Pt/CeO 2 , [ 95,125‐126 ] Pd/CeO 2 , [ 60,65,127‐129 ] Ru/CeO 2 , [ 61,130‐132 ] and Ni/CeO 2 [ 133‐134 ] catalysts. Zhang et al .…”

Promoted Ru/Al2O3 catalysts with improved low‐temperature activity for CO2 methanation reaction

“…S1). The three samples shows a steep uptake above p/p 0 = 0.7 with a weak H3-type hysteresis loop, 11 corresponding to a type III isotherm which is commonly seen in the mesoporous or microporous materials. 26,27 In order to highlight the effect of Pt on the activity of catalyst, the reaction was tested with a diluted reactant feed (12% H 2 /3% CO 2 /85% N 2 ) at the same total gas flow of 50 mL/min.…”

“…The hydrogenation of CO 2 to CH 4 , also known as the Sabatier reaction, not only reduces CO 2 emissions 9 but also provides a sustainable route for synthesizing useful fuels 10 . However, CO 2 methanation is an eight‐electron conversion process with significant kinetic constraints 11,12 . The high reaction temperature will result in the undesirable influences on the catalyst structure, as well as the increased energy consumption 13,14 .…”

“…10 However, CO 2 methanation is an eight-electron conversion process with significant kinetic constraints. 11,12 The high reaction temperature will result in the undesirable influences on the catalyst structure, as well as the increased energy consumption. 13,14 Besides, the CO selectivity will raise if the temperature is high due to the reverse water gas shift (RWGS) reaction.…”