石墨烯负载镍催化CO_2加氢甲烷化

采用改进的Hummers法制备了氧化石墨烯(GO),经水合肼还原得到石墨烯(RGO),通过浸渍法制备了石墨烯负载的镍基催化剂(Ni/RGO);对其催化二氧化碳甲烷化反应的性能进行了研究,并与以碳纳米管(CNTs)和活性炭(AC)为载体负载的Ni基催化剂进行了比较.由于催化剂的载体分别为RGO,CNTs和AC,所以Ni将会表现出不同的形态.利用红外光谱(FTIR)、比表面积(BET)测试、程序升温还原(H2-TPR)、X射线衍射(XRD)分析和透射电子显微镜(TEM)等表征手段对其结构及物理性质进行了表征.结果表明,Ni/RGO具有相对较大的比表面积(316 m~2/g),Ni在Ni/RGO上的颗粒尺寸(5.3 nm)小于其在Ni/CNTs(8.9 nm)和Ni/AC(11.6 nm)上的颗粒尺寸;该催化剂在二氧化碳甲烷化反应中具有更高的催化活性和选择性,而且具有良好的使用寿命.

Graphene Supported Nickel Catalyst for Methanation of Carbon Dioxide

Graphene oxide ( GO) was prepared from purified natural graphite via the modified Hummers method, and hydrazine hydrate reduced graphene oxide supported nickel catalysts were prepared via impregna-tion method. The influence of different supports of Ni-based catalysts for the carbon dioxide methanation reac-tion was investigated. Using reduced graphene oxide(RGO), carbon nanotubes(CNTs) and activated carbon (AC) as supports, nickel catalysts with different morphologies were formed. The prepared samples were char-acterized by FTIR, BET, H2-TPR, XRD and TEM techniques and applied in carbon dioxide methanation. The results reveal that Ni/ RGO has a relative large specific surface area(316 m2 / g). The particle size of nickel on Ni/ RGO(5. 3 nm) is smaller than that on Ni/ CNTs(8. 9 nm) and Ni/ AC(11. 6 nm). Ni/ RGO shows better catalytic activity and selectivity of carbon dioxide methanation reaction than that on Ni/ CNTs and Ni/ AC. Ni/RGO catalyst has a remarkable stability.