Carbon gasification in molten alkali carbonate salts over CO₂ is a process to produce gaseous fuels with mitigating the greenhouse effect. Alkali carbonate salts can facilitate Boudouard reaction, which is difficult to occur even at high reaction temperature if the catalyst is absent. Alkali carbonate allows easily carbon−CO₂ contact by changing the reaction interface from gas-solid to gas-liquid. This review focused on CO₂ utilization for alkali carbonate gasification and biomass/coal co-gasification. CO₂ gasification of biomass and coal with the alkali carbonate salts enhances the carbon conversion rate and CO yield. Furthermore, alkali carbonate salts gasification of biomass and coal could reduce reaction temperature, activation energy, and tar formation in the product gas. The factors that influence the carbon conversion rate were discussed, such as reaction temperature, CO₂ concentration, alkali carbonate addition, and char feeding mode. On the other hand, blending coal with biomass is considered as potential fuel base for CO₂ co-gasification and displays an advantage for improving the coal char reactivity. The alkali and alkaline earth metals (AAEMs) present in biomass ash acted as a natural catalyst to increase the coal reactivity and CO production. The catalytic effect in the co-gasification enhances by raising the percentage of biomass in the blend. In contrast, the inhibiting effect in co-gasification could be attributed to silica and alumina reactions with AAEMs to form aluminosilicates complexes.

在CO ₂上的熔融碱金属碳酸盐中进行碳气化是一种生产气体燃料的方法，可减轻温室效应。碱金属碳酸盐可以促进Boudouard反应，如果没有催化剂，即使在高反应温度下也很难发生。通过将反应界面从气固变为气液，碱金属碳酸盐可轻松实现碳-CO ₂接触。这篇综述集中于碱金属碳酸盐气化和生物质/煤共气化的CO ₂利用。一氧化碳₂用碱金属碳酸盐将生物质和煤气化可提高碳转化率和CO收率。此外，生物质和煤的碱金属碳酸盐气化可以降低反应温度，活化能和产物气中焦油的形成。讨论了影响碳转化率的因素，如反应温度，CO ₂浓度，碱金属碳酸盐的添加和焦炭进料方式。另一方面，将煤与生物质混合作为CO _2的潜在燃料基础共气化并显示出改善煤焦反应性的优势。生物质灰分中存在的碱金属和碱土金属（AAEM）充当天然催化剂，可提高煤的反应性和CO的产量。通过提高共混物中生物质的百分比来增强共气化的催化效果。相反，共气化中的抑制作用可归因于二氧化硅和氧化铝与AAEM的反应形成硅铝酸盐络合物。