Dry reforming of methane usually affords low-quality syngas with equimolar amounts of CO and H₂. Here we report the high conversion of CH₄ and CO₂ to syngas and solid carbon through simultaneous pyrolysis and dry reforming of methane in a bubble column reactor using a molten metal alloy catalyst (65:35 mol% Ni:In). The H₂ to CO ratio can be increased above 1:1 using feed ratios of CH₄:CO₂ greater than 1:1 to produce stoichiometric solid carbon as a co-product that is separable from the molten metal. A coupled reduction–oxidation cycle is carried out in which CO₂ is reduced by a liquid metal species (for example, In) and methane is partially oxidized to syngas by the metal oxide intermediate (for example, In₂O₃), regenerating the native metal. Moreover, the H₂:CO product ratio can be easily controlled by adjusting the CH₄:CO₂ feed ratio, temperature, and residence time in the reactor.

甲烷的干重整通常会提供等摩尔量的CO和H ₂的劣质合成气。在这里，我们报告了在鼓泡塔反应器中使用熔融金属合金催化剂（65:35 mol％Ni：In）同时进行甲烷的热解和干重整，从而将CH ₄和CO ₂高转化为合成气和固体碳。使用CH ₄：CO _2的进料比大于1：1，可以将H ₂与CO的比率提高到1：1以上，以产生化学计量的固态碳作为副产物，可与熔融金属分离。进行还原-氧化耦合循环，其中CO ₂通过液态金属物质（例如，In）被还原，并且甲烷被金属氧化物中间体（例如，In ₂ O ₃）部分氧化成合成气，从而再生天然金属。此外，通过调节CH ₄：CO _2的进料比，温度和在反应器中的停留时间，可以容易地控制H ₂：CO的产物比。