中文摘要：

为解决传统的甲烷转化技术缺陷，提出了一种新型的熔融盐化学循环反应体系。整个过程分两步：第一步，在熔融碱金属碳酸盐介质中甲烷与ZnO反应生成金属锌和合成气；第二步，金属锌分解水产生氢气和ZnO，从而ZnO又循环到第一步循环利用。根据最小吉布斯自由能原理，采用HSC化学热力学计算软件，对甲烷与ZnO气-固相反应重要中间反应的△rG°进行了计算和分析，进一步分析了该体系反应过程中温度和反应物比例对反应产物平衡组分的影响。结果表明，气体产物中合成气的量随反应温度的增加而增加，比较适宜的反应温度在1200K左右，同时当n（CH4）／n（ZnO）=1时，产物中n（n2）／n（Co）=2。另外，CH4与熔融盐之间在高温时有微弱反应，但产物仍是合成气。热力学分析表明该热化学循环体系在理论上是切实可行的。

英文摘要：

To solving the problems of conventional methane reforming process, a novel thermoehemical cyclic system is proposed. In this system, the whole cyclic process is divided into two steps. The first step is methane reaction with zinc oxide to form synthesis gas and metallic zinc in alkali molten carbonate medium. The second step is zinc oxide and hydrogen production from water-split with metallic zinc, and zinc oxide from this step is recycled to the first step. Based on Gibbs free energy minimization, using the HSC chemical thermodynamics software, the △rG° of the significant intermediate reactions in the gas-solid reaction of CH4 ＋ ZnO were calculated and analyzed. The effects of temperature and ratio of reactants on the synthesis gas production process were analyzed. The research results showed that synthesis gas concentration increased with the temperature, the appropriate reaction temperature was around 1200K, and the molar ratio of H2 to CO was about two when the reactant molar ratio of CH4 to ZnO was one, In addition, the reaction was existent between methane and molten salt at high reaction temperature, but the products were also synthesis gas. The results of thermodynamic analysis indicate that this thermochemical cyclic system is possible in theory.