γ-Al2O3 supported Ni-Mn bimetallic catalysts for CO2 reforming of methane were prepared by impregnation method. The reforming reactions were conducted at 500-700℃ and atmospheric pressure using CO2/CH4/N2 with feed ...γ-Al2O3 supported Ni-Mn bimetallic catalysts for CO2 reforming of methane were prepared by impregnation method. The reforming reactions were conducted at 500-700℃ and atmospheric pressure using CO2/CH4/N2 with feed ratio of 17/17/2, at total flow rate of 36 mL/min. The catalytic performance was assessed through CH4 and CO2 conversions, synthesis gas ratio （H2/CO） and long term stability. Catalytic activity and stability tests revealed that addition of Mn improved catalytic performance and led to higher stability of bimetallic catalysts which presented better coke suppression than monometallic catalyst. In this work, the optimum loading of Mn which exhibited the most stable performance and least coke deposition was 0.5wt%. The fresh and spent catalysts were characterized by various techniques such as Brunauer-Emmett-Teller, the temperature programmed desorption CO2- TPD, thermogravimetric analysis, X-ray diffraction, scanning electron microscope, EDX, and infrared spectroscopy.展开更多
用浸渍法制备了 Ni/ Si O2 和 Ni/ Ca O- Si O2 催化剂 ,研究了流化床反应器中用 Ca O改性微球硅胶载体对催化性能的影响 ,考察了 Ni/ Ca O- Si O2 催化剂上甲烷部分氧化与甲烷二氧化碳重整耦合制合成气反应中 Ca负载量、反应温度、空...用浸渍法制备了 Ni/ Si O2 和 Ni/ Ca O- Si O2 催化剂 ,研究了流化床反应器中用 Ca O改性微球硅胶载体对催化性能的影响 ,考察了 Ni/ Ca O- Si O2 催化剂上甲烷部分氧化与甲烷二氧化碳重整耦合制合成气反应中 Ca负载量、反应温度、空速和原料气中的 O2 / CO2 比对活性与选择性以及产物 H2 / CO比的影响 ,并用 XRD、TEM、H2 - TPR和 CO2 - TPD等测试手段对催化剂进行了表征。结果表明 ,经过氧化钙改性的微球硅胶能够将“自由态”的镍物种转变为“束缚态”,使镍物种达到高度分散状态。引入 10(wt) % Ca助剂所制备的催化剂具有很好的活性和稳定性 。展开更多
文摘γ-Al2O3 supported Ni-Mn bimetallic catalysts for CO2 reforming of methane were prepared by impregnation method. The reforming reactions were conducted at 500-700℃ and atmospheric pressure using CO2/CH4/N2 with feed ratio of 17/17/2, at total flow rate of 36 mL/min. The catalytic performance was assessed through CH4 and CO2 conversions, synthesis gas ratio （H2/CO） and long term stability. Catalytic activity and stability tests revealed that addition of Mn improved catalytic performance and led to higher stability of bimetallic catalysts which presented better coke suppression than monometallic catalyst. In this work, the optimum loading of Mn which exhibited the most stable performance and least coke deposition was 0.5wt%. The fresh and spent catalysts were characterized by various techniques such as Brunauer-Emmett-Teller, the temperature programmed desorption CO2- TPD, thermogravimetric analysis, X-ray diffraction, scanning electron microscope, EDX, and infrared spectroscopy.
