| 高晓霞,王奖,徐爱菊,贾美林.Ni-Co-Al混合氧化物的制备及其丙烷氧化脱氢催化性能[J].分子催化,2019,33(6):531-541 |
| Ni-Co-Al混合氧化物的制备及其丙烷氧化脱氢催化性能 |
| Preparation of Ni-Co-Al Mixed Oxides and Their Catalytic Performance for Oxidative Dehydrogenation of Propane |
| 投稿时间：2019-10-10 修订日期：2019-11-15 |
| DOI： |
| 中文关键词: 类水滑石 混合金属氧化物 镍 钴 丙烷氧化脱氢 |
| 英文关键词:layered double hydroxide mixed metal oxide nickel cobalt oxidative dehydrogenation of propane |
| 基金项目:内蒙古自治区水环境安全协同创新培育中心项目（XTCX003）；内蒙古自然科学基金（2019MS02016）；内蒙古师范大学研究生科研创新基金资助项目（CXJJS18084） |
|
| 摘要点击次数: 1295 |
| 全文下载次数: 1261 |
| 中文摘要: |
| 采用恒定pH共沉淀法制备不同Ni/Co摩尔比的3（NixCo1-x）-Al类水滑石前驱体，600℃焙烧得3（NixCo1-x）Al混合氧化物（MMO）催化剂（x=1，0.95，0.90，0.75，0.50，0.25，0），通过电感耦合等离子体发射光谱、N2物理吸附-脱附、X射线衍射和透射电子显微镜表征其组成、表面织构、晶相和微观形貌，考察Ni/Co摩尔比对其丙烷氧化脱氢制丙烯催化性能的影响.结果表明，3（Ni0.90Co0.10）Al MMO催化剂催化性能最佳：丙烯选择性随反应温度升高未发生明显降低，反应温度500℃时丙烷转化率31%、丙烯选择性48%，丙烯收率15%，且催化剂寿命良好.通过X射线光电子能谱、H2程序升温还原和原位电导测试研究发现，掺杂少量Co后催化剂表面Ni（II）与Co（II/III）间存在电子交互作用，表面类NiO相分散性提高，晶格氧物种增多，催化剂具有优良的氧化还原可逆性. |
| 英文摘要: |
| A series of 3(NixCo1-x)-Al layered double hydroxide (LDH) precursors with different Ni/Co molar ratios were prepared by a constant pH coprecipitation method. The 3(NixCo1-x)Al mixed oxide (MMO) catalysts (x=1, 0.95, 0.90, 0.75, 0.50, 0.25, 0) were obtained after calcination of the LDH precursors at 600℃. The composition, surface texture, crystal phase and micromorphology of the catalysts were characterized by Inductively Coupled Plasma Emission Spectroscopy (ICP-MS), N2 Physical Adsorption-desorption, X-ray Diffraction (XRD) and Transmission Electron Microscope (TEM). And the effects of Ni/Co molar ratios on their catalytic performance for oxidative dehydrogenation of propane (ODHP) to propylene were investigated. The results showed that 3(Ni0.90-Co0.10)Al MMO catalyst had the best catalytic performance:The propylene selectivity was not decreased obviously with the increase of reaction temperature; the propane conversion was 31%, the propylene selectivity was 48% and the propylene yield was 15% at 500℃; furthermore the stability of the catalyst was excellent. It was considered that there was an electronic interaction between the surface Ni(II) and Co(II/III), the dispersion of the surface NiO-like phase was improved and the surface lattice oxygen species were increased after a small amount of Co doping, then the catalyst showed an excellent reversibility of oxidation-reduction, through the study of X-ray Photoelectron Spectroscopy (XPS), H2 Temperature Programmed Reduction (H2-TPR) and In-situ conductivity measurements. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
