Low-Rank Coal Supported Ni Catalysts for CO2 Methanation

Abstract

As renewable energy source integration increases, P2G technology that can store surplus renewable power as methane is expected to expand. The development of a CO2 methanation catalyst, one of the core processes of the P2G concept, is being actively conducted. In this work, low-rank coal (LRC) was used as a catalyst support for CO2 methanation, as it can potentially enhance the diffusion and adsorption behavior by easily controlling the pore structure and composition. It can also improve the process efficiency owing to its simplicity (no pre-reduction step) and high thermal conductivity, compared to conventional metal oxide-supported catalysts. A screening of single metals (Ni, Co, Ru, Rh, and Pd) on LRC was performed, which showed that Ni was the most active. When Ni on the LRC catalyst was doped with a promoter (Ce and Mg), the CO2 conversion percentage increased by >10% compared to that of the single Ni catalyst. When the CO2 methanation activity was compared at 250–500 °C, the Ce-doped Ni/Eco and Mg-doped Ni/Eco catalysts showed similar or better activity than the commercial metal oxide-supported catalyst. In addition, the catalytic performance remained stable even after the test for an extended time (~200 h). The results of XRD, TEM, and TPR showed that highly efficient LRC-based CO2 methanation catalysts can be made when the metal dispersion and composition are modified.

Past, Present and Near Future: An Overview of Closed, Running and Planned Biomethanation Facilities in Europe

“…There are four different solutions for methanation, two of them are already in use at the commercial scale: chemical and biological methanation. These solutions have different operational characteristics that are thoroughly analyzed in the literature (see, e.g., [19] or [28]). One of the main differences is that while chemical (catalytic) methanation needs high pressure and temperature to reach high CO 2 conversion, which can be 50-60% and 80-90% or higher in proper conditions, biological methanation needs lower pressure and temperature (ca.…”

Insights into Nickel-Based Dual Function Materials for CO2 Sorption and Methanation: Effect of Reduction Temperature

“…CO 2 as an important C1 source represents a very promising feedstock in the synthesis of bulk chemicals and synthetic fuels. , Hence, the chemical conversion of CO 2 to value-added products has received considerable attention . One typical case is the power to gas (P2G) technology, which involves the hydrogenation of CO 2 to CH 4 using green hydrogen produced through renewable energy-powered electrolysis. − The scheme shows significant implications in carbon emission reduction and clean energy storage . The scale-up application of the P2G scheme is based on the condition that CO 2 is purified and concentrated from flue gas in large point sources .…”