CeO_2中晶格氧直接部分氧化甲烷制取合成气的研究

Direct partial oxidation of methane to syngas by lattice oxygen of cerium oxide

介绍了一种合成气制取的新方法-熔融盐中用晶格氧直接部分氧化甲烷制取合成气技术，对该技术的概念进行了阐述．以CeO2为氧载体，对反应过程进行了热力学分析，结果表明以CeO2中晶格氧直接部分氧化甲烷制合成气是可行的。在固定床石英反应器中对非熔融盐体系下的氧载体进行了性能评价，并用XRD技术进行了氧载体的表征。在750～900℃温度范围内，分别对（0．462×10^4）／h，（0．924×10^4）／h，（1．386×10^4）／h三种空速进行了实验，同时对产物气中n（H2）／n（CO）进行了考察，结果表明，（0．924×10^4）／h的空速和900℃的温度比较适于合成气的制取，失去晶格氧的CeO2-x。有着很好的氧再生能力．

A new technique - direct partial oxidation of methane to syngas using lattice oxygen in molten salt is introduced, and the concept of this technology is expounded. Using CeO2 as oxygen carrier, the thermodynamic data are calculated for reaction process, and the result indicates that direct partial oxidation of methane to syngas using lattice oxygen of cerium oxide is feasible. In a fixed quartz bed reactor, the performance of oxygen carrier is evaluated in a no molten salt system. The oxygen carrier is characterized by means of X - ray diffraction （ XRD ）. In the temperature range from 750 to 900 ℃, three space velocity of （0. 462 × 10^4 ）/h, （0. 924 × 10^4 ）/h, （ 1. 386 × 10^4 ）/h are experimented respectively, and the ratio of H2/CO in production gas is investigated. The results show that the space velocity of （0. 924 × 10^4 ）/h and the temperature of 900 ℃ are suitable for making syngas. The CeO2-x which lose lattice oxygen, can be easily regenerated.