| SrTi1-xMgxO3-δ钙钛矿型氧化物催化剂甲烷氧化偶联反应性能的研究 |
| A Study of the Catalytic Properties of SrTi1-xMgxO3-δ Perovskite-type Catalysts for Oxidative Coupling of Methane |
|
| 摘要: |
| 关键词: 甲烷氧化偶联 钙钛矿 氧空位 吸附态氧 水蒸气 |
| 基金项目: |
| Abstract: The structure and catalytic properties of SrTi1-xMgxO3-δ perovskite-type catalysts for oxidative coupling of methane (OCM) have been studied by using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Temperature-programmed desorption (O2-TPD) methods. It has been shown that doping Mg2+ cations to the B site of SrTi1-xMgxO3-δ perovskite-type catalysts results in the formation of oxygen vacancies in the lattices of oxide cata-lysts. With increasing the amount of Mg2+ doped in the B site of SrTi1-xMgxO3-δ, methane conversion and C2 selectivity first increase and then decrease remarkably. The SrTi1-xMgxO3-δ catalyst with x=0.1 has the highest methane conversion and C2 yield. It is suggested that the oxygen vacancies produced by Mg2+ cations doping are the sites responsible for oxygen activation, and the adsorbed oxygen species on the surface of SrTi1-xMgxO3-δ catalysts are the main active species for OCM reaction. However, the over high content of the adsorbed oxygen species on the surface results in the complete oxidation of methane. Introducing water steam into feedstock can improve the catalytic properties of SrTi1-xMgxO3-δ perovskite-type catalysts for OCM reaction at lower temperature. The SrTi0.9Mg0.1O3-δ catalyst has the methane conversion of 28.0 % with C2 hydrocarbons selectivity of 36.8 % under reaction temperature of 550 ℃. |
| Keywords: OCM perovskite-type oxygen vacancy absorbed oxygen water steam |
| |
| 摘要点击次数: 1296 |
| 全文下载次数: 1698 |
| 缪建文,范以宁,金永漱,陈 懿.SrTi1-xMgxO3-δ钙钛矿型氧化物催化剂甲烷氧化偶联反应性能的研究[J].无机化学学报,2003,19(12):1361-1365. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
