A short review on recent advancements of dry reforming of methane (DRM) over pyrochlores

Abstract

Methane reforming with CO2 (DRM) is a recognized study in both research and industry sectors for the generation of syngas. The value-added products like higher alkanes and oxygenates from Fischer-Tropsch method requires syngas as a feedstock. Typically, DRM is an endothermic reaction and to attain high conversions of CH4 and CO2 to form syngas (H2 and CO), temperature range of 700–1000 °C is recommended. The most important parameter to be considered in DRM is the deactivation of catalyst due to coke deposition, however, this can be addressed by developing catalysts with strong metal support interactions (SMSI). A large number of articles based on Ni have been published, demonstrating its high catalytic activity for DRM as well as its limited commercial feasibility. Unfortunately, majority of Ni-based catalysts are ineffective in preventing coke deposition at temperatures above 700 °C. To reduce the coke deposition, pyrochlore materials act as a replacement to Ni other than noble metals. Pyrochlores showed significant potential towards DRM by having low coke resistance at higher temperatures. Pyrochlore materials with various effecting parameters such as substitution of transition and noble metals, modifications with promoters, alkaline earth metals and other inert supports are briefed in this review.