Carbon monoxide (CO) is a highly valuable component of syngas which could be used to synthesize various chemicals and fuels. Conventionally, syngas is derived from fossil-based natural gas and coal which are non-renewable. To curb the problem, CO₂ gasification offers a win-win solution in which CO₂ is converted with wastes to CO, achieving carbon emission mitigation and addressing waste disposal issue simultaneously. In this review, gasification of various wastes by CO₂ with particular focus given to generation of CO-rich syngas is presented and critically discussed. This includes the effects of operating parameters (temperature, pressure and physicochemical properties of feedstocks) and advanced CO₂ gasification techniques (catalytic CO₂ gasification, CO₂ co-gasification and microwave-driven CO₂ gasification). Furthermore, associated technological challenges are highlighted and way forward in this field are proposed.

一氧化碳（CO）是合成气中非常有价值的成分，可用于合成各种化学物质和燃料。常规上，合成气源自不可再生的基于化石的天然气和煤炭。为了解决该问题，CO ₂气化提供了双赢的解决方案，其中将CO ₂与废物转化为CO，实现了减少碳排放并同时解决废物处置问题。在这篇综述中，提出并批判性地讨论了用CO ₂对各种废物进行气化的方法，特别着重于富CO合成气的产生。这包括操作参数（原料的温度，压力和物理化学性质）和高级CO _2的影响气化技术（催化CO ₂气化，CO ₂共气化和微波驱动的CO ₂气化）。此外，突出了相关的技术挑战，并提出了该领域的发展方向。