Developments in solid porous materials for methane enrichment in coalbed gas
Methane in coal mine methane(CMM)serves not merely as a pivotal and sustainable low-carbon energy source,but equally as a disconcerting explosive and greenhouse gas pollutant.Finding a consistent,efficient technique for methane enrichment is of paramount importance in enhancing safety measures within the current coal mining industry and addressing natural gas shortages.Industrial scale application has,however,been impeded by significant impurities present in coal-bed methane,specifically the efficient separation of carbon dioxide and nitrogen contaminants.This paper aimed to encapsulate two major focus areas in the process of coal-bed methane enrichment via vacuum pressure swing adsorption(VPSA):carbon dioxide capture(CO2/CH4 separation)and purification of natural gas(CH4/N2 separation).Here,effective adsorbents for segregating methane gas mixtures denoted the crux of VPSA technology advancements.Furthermore,it was further focused on analyzing and comparing the differences and similarities of three typical solid adsorbents,namely carbon-based adsorbents,zeolite molecular sieves and metal-organic frameworks,in separating or adsorbing methane in the above two directions.Among them,coupling different functional groups on the adsorbent surface or fine-tuning their pore structure at the nanoscale would be an effective way to continuously improve the adsorption separation efficiency of coalbed methane enrichment.In addition,the challenges and development directions faced by solid porous materials in the future were also discussed,hoping to help researchers understand the technical premise of CMM methane enrichment adsorbents and design novel adsorbents to meet the multiple stringent industrial requirements for methane separation.
coal mine methanemethane enrichmentsolid adsorbentscarbon dioxide capturenatural gas purification
万方数据
维普
