TiO2/γ-Al2O3 supported In/Ag catalysts were prepared by impregnation method,and investigated for NO reduction with CO as the reducing agent under lean burn conditions.The microscopic structure and surface properties ...TiO2/γ-Al2O3 supported In/Ag catalysts were prepared by impregnation method,and investigated for NO reduction with CO as the reducing agent under lean burn conditions.The microscopic structure and surface properties of the catalysts were studied by N2 adsorption-desorption,X-ray diffraction,transmission electron microscopy,X-ray photoelectron spectroscopy,ultraviolet-visible spectroscopy,H2 temperature-programmed reduction and Fourier transform infrared spectroscopy.TiO2/γ-Al2O3 supported In/Ag is a good catalyst for the reduction of NO to N2.It displayed high dispersion,large amounts of surface active components and high NO adsorption capacity,which gave good catalytic performance and stability for the reduction of NO with CO under lean burn conditions.The silver species stabilized and improved the dispersion of the indium species.The introduction of TiO2 into the γ-Al2O3 support promoted NO adsorption and improved the dispersion of the indium species and silver species.展开更多
以菱镁矿煅烧制的得轻烧镁为原料,经消化、碳酸化制得碳酸氢镁溶液,采用活性炭为吸附剂脱除钙、铁等杂质,再热解、煅烧制得高纯氧化镁。研究了吸附温度和接触时间等因素对活性炭吸附除铁的影响,以及酸用量和时间对活性炭再生的影响。结...以菱镁矿煅烧制的得轻烧镁为原料,经消化、碳酸化制得碳酸氢镁溶液,采用活性炭为吸附剂脱除钙、铁等杂质,再热解、煅烧制得高纯氧化镁。研究了吸附温度和接触时间等因素对活性炭吸附除铁的影响,以及酸用量和时间对活性炭再生的影响。结果表明:在20℃下,吸附反应80 m in,最终的氧化镁产品中MgO含量大于99.5%,CaO含量小于0.09%,Fe含量小于0.05%;时间对再生效果影响甚微,活性炭再生效果良好,可以重复利用,为制备各种高纯氧化镁提供了一条新途径。展开更多
基金supported by the National Science & Technology Pillar Program(2012BAF03B02)National Natural Science Foundation of China(21101085,U1162203)+3 种基金Natural Science Foundation of Liaoning Province(2015020196)Doctoral Fund of Shandong Province(BS2015HZ003)Fushun Science & Technology Program(FSKJHT 201423)Liaoning Excellent Talents Program in University(LJQ2012031)~~
文摘TiO2/γ-Al2O3 supported In/Ag catalysts were prepared by impregnation method,and investigated for NO reduction with CO as the reducing agent under lean burn conditions.The microscopic structure and surface properties of the catalysts were studied by N2 adsorption-desorption,X-ray diffraction,transmission electron microscopy,X-ray photoelectron spectroscopy,ultraviolet-visible spectroscopy,H2 temperature-programmed reduction and Fourier transform infrared spectroscopy.TiO2/γ-Al2O3 supported In/Ag is a good catalyst for the reduction of NO to N2.It displayed high dispersion,large amounts of surface active components and high NO adsorption capacity,which gave good catalytic performance and stability for the reduction of NO with CO under lean burn conditions.The silver species stabilized and improved the dispersion of the indium species.The introduction of TiO2 into the γ-Al2O3 support promoted NO adsorption and improved the dispersion of the indium species and silver species.
文摘以菱镁矿煅烧制的得轻烧镁为原料,经消化、碳酸化制得碳酸氢镁溶液,采用活性炭为吸附剂脱除钙、铁等杂质,再热解、煅烧制得高纯氧化镁。研究了吸附温度和接触时间等因素对活性炭吸附除铁的影响,以及酸用量和时间对活性炭再生的影响。结果表明:在20℃下,吸附反应80 m in,最终的氧化镁产品中MgO含量大于99.5%,CaO含量小于0.09%,Fe含量小于0.05%;时间对再生效果影响甚微,活性炭再生效果良好,可以重复利用,为制备各种高纯氧化镁提供了一条新途径。
