摘要
甲烷部分氧化制合成气由于合成气中n(H2)/n(CO)接近2,可直接用于甲醇合成或烃类F-T合成等后续工业过程而在国内外受到了广泛的关注。利用氧载体的氧物种在无气相氧下直接选择氧化甲烷制合成气是天然气化工利用的新方法,本文介绍了该方法的基本原理、概念工艺和对氧载体的性能要求,对应用于该方法的铈基复合氧化物的掺杂和助剂对选择氧化甲烷性能的影响、钙钛矿氧化物氧载体的氧缺陷、氧物种迁移、结构稳定性及其氧物种氧化甲烷的性能进行了阐述和分析,提出了控制氧载体表面状态是获得高合成气选择性的关键,并对该技术今后的研究重点进行了展望。
Much attention has been paid to the reactions of the partial oxidation of methane （POM） to synthesis gas in heterogeneous catalysis due to synthesis gas with a He/CO ratio of ca. 2, which is suitable for methanol and Fischer- Tropsch synthesis. Direct partial oxidation of methane to synthesis gas using oxygen carriers as oxidant in the absence of gaseous oxygen is a new technology for the utilization of natural gas. The process principle, process concept, selection and requirements of oxygen carriers for methane oxidation are introduced. We summarize the latest progresses in CeO2-based oxygen carriers about dopants and promoters, and perovskite-based oxygen carriers about oxygen ion vacancy, oxygen migration, structural stability, and performance for direct partial oxidation of methane in the absence of gaseous oxygen. The product distribution for POM using oxygen carrier is determined by surface state, which can be optimized by controlling appropriate amounts of replenished lattice oxygen with gaseous oxygen. Moreover, the major problems and research directions in this area are proposed.
出处
《化学进展》
SCIE
CAS
CSCD
北大核心
2009年第7期1626-1635,共10页
Progress in Chemistry
基金
国家自然科学基金项目(No.20306016)资助
关键词
氧载体
晶格氧
选择氧化
甲烷
合成气
oxygen carriers
lattice oxygen
partial oxidation
methane
synthesis gas
