| 李靖,王奖,贾美林.Ni-Al复合氧化物/介孔杭锦2#土负载Au催化剂制备及其CO氧化催化性能[J].分子催化,2018,32(6):530-539 |
| Ni-Al复合氧化物/介孔杭锦2#土负载Au催化剂制备及其CO氧化催化性能 |
| Preparation of Ni-Al Mixed Oxide/Mesoporous Hangjin 2# Clay-Supported Gold Catalyst and Their Catalytic Performance for CO Oxidation |
| 投稿时间：2018-07-23 修订日期：2018-09-19 |
| DOI： |
| 中文关键词: 粘土 类水滑石 负载Au催化剂 CO催化氧化 金属-载体强相互作用 |
| 英文关键词:clay layered double hydroxide supported gold catalyst CO catalytic oxidation strong metal-support interaction |
| 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（2015MS0225）. |
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| 中文摘要: |
| 采用导向剂共沉淀-水热法合成不同复合量3Ni-Al类水滑石（LDH）/酸化杭锦2#土载体前驱物.以液相还原-焙烧法制备不同Au负载量的Ni-Al复合氧化物/介孔杭锦2#土负载Au催化剂.采用电感耦合等离子体发射光谱（ICP-AES）、原子吸收光谱（AAS）、N2物理吸附-脱附、X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）、紫外-可见漫反射光谱（UV-Vis DRS）、X射线光电子能谱（XPS）等手段对催化剂进行表征；并考察其催化CO氧化活性及稳定性.结果表明，3Ni-Al LDH在酸化杭锦2#土上复合均匀；其负载Au后经500℃空气气氛焙烧，催化剂具有介孔结构，Au颗粒分散均匀、平均粒径小于10 nm；Ni-Al LDH复合量增加有利于纳米Au分散并抑制其粒径增大，且纳米Au与载体间存在较强相互作用；随Ni-Al LDH复合量和Au负载量增加，负载Au催化剂催化活性提高，当Ni-Al LDH复合量15%（Ni 3.47%），Au负载量3%时，所得负载Au催化剂性能最佳：T50为48℃，80℃时CO转化率大于90%，180℃连续反应10 h，CO转化率保持100%，空气放置110 d后，虽然其低温活性有所下降，但120℃时，仍可实现CO转化率大于90%. |
| 英文摘要: |
| A series of x% 3Ni-Al layered double hydroxide (LDH)/acidification Hangjin 2# clay were synthesized by a coprecipitation with directing agent-hydrothermal method. Ni-Al mixed oxide/mesoporous Hangjin 2# clay-supported gold catalysts with different Au loading were prepared by the liquid phase reduction-calcination method. The catalysts were characterized by Inductively Coupled Plasma Atomic Emission Spectrometer (ICP-AES), Atomic Absorption Spectrophotometer (AAS), N2 Physical Adsorption-desorption, X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), UV-Vis Diffuse Reflectance Spectroscopy (UV-Vis DRS), and X-ray Photoelectron Spectroscopy (XPS); and their CO oxidation activities and stabilities were investigated. The results show that 3Ni-Al LDH is uniformly mixed on the surface of the acidification Hangjin 2# clay; after calcinations at 500℃ in air atmosphere. The supported Au catalysts are mesoporous and the Au nanoparticles are uniformly dispersed with the average particle size less than 10 nm; the increase of the amount of Ni-Al LDH is beneficial to improve the dispersion of Au nanoparticles and could inhibit the aggregation of the particles due to the strong metal-support interactions between Au nanoparticles and the supports. The increase of Ni-Al LDH amount and the Au loading could improve the catalytic activity of the Au catalysts. The supported Au catalyst with 15% Ni-Al LDH amount (Ni 3.47%) and 3% Au loading gives the best catalytic performance:T50 is 48℃ CO conversion, the CO conversion is more than 90% at 80℃, 100% CO conversion could be maintained for 10 hours at the reaction temperature of 180℃. 90% CO conversion can still be kept at 120℃ after the catalyst was stored in air for 110 days. |
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