Research Progress of Carbon Deposition on Ni-Based Catalyst for CO2-CH4 Reforming

Abstract

As we all know, the massive emission of carbon dioxide has become a huge ecological and environmental problem. The extensive exploration, exploitation, transportation, storage, and use of natural gas resources will result in the emittance of a large amount of the greenhouse gas CH4. Therefore, the treatment and utilization of the main greenhouse gases, CO2 and CH4, are extremely urgent. The CH4 + CO2 reaction is usually called the dry methane reforming reaction (CRM/DRM), which can realize the direct conversion and utilization of CH4 and CO2, and it is of great significance for carbon emission reduction and the resource utilization of CO2-rich natural gas. In order to improve the activity, selectivity, and stability of the CO2-CH4 reforming catalyst, the highly active and relatively cheap metal Ni is usually used as the active component of the catalyst. In the CO2-CH4 reforming process, the widely studied Ni-based catalysts are prone to inactivation due to carbon deposition, which limits their large-scale industrial application. Due to the limitation of thermodynamic equilibrium, the CRM reaction needs to obtain high conversion and selectivity at a high temperature. Therefore, how to improve the anti-carbon deposition ability of the Ni-based catalyst, how to improve its stability, and how to eliminate carbon deposition are the main difficulties faced at present.