Glow Discharge Plasma-Assisted Preparation of Nickel-Based Catalyst for Carbon Dioxide Reforming of Methane

一个帮助血浆的方法被采用准备 Ni/γ-Al 2 为甲烷反应改过的二氧化碳的 O 3 催化剂。新奇催化剂常规锻烧催化剂比那些拥有了更高的活动和更好的焦炭抑制性能。完成一样的 CH 4 变换，常规催化剂需要更高的反应温度，比 N 2 的高的大约 50 ° C 对待血浆的催化剂。在评估测试以后，新奇催化剂的释放率为常规催化剂是 1.7% ，与 15.2% 相比。与锻烧的催化剂，一条更小的平均毛孔直径和一个更高特定的表面区域的描述结果不同为对待血浆的催化剂被获得。减小山峰温度和区域的变化显示催化剂 reducibility 被血浆帮助支持。镍的分散显著地也被改进，它对在催化剂表面上控制金属原子的整体尺寸有用。氧化铝的表面性质上的帮助血浆的准备的修正效果支持了催化剂被推测说明吸收公司 2 的集中增加。公司 2 吸附的改进对碳形成的抑制慈悲。在血浆上扔的焦炭数量对待催化剂在常规催化剂上是比那小得多的。

A plasma-assisted method was employed to prepare Ni/γ-All2O3 catalyst for carbon dioxide reforming of methane reaction. The novel catalyst possessed higher activity and better coke-suppression performance than those of the conventional calcination catalyst. To achieve the same CH4 conversion, the conventional catalyst needed higher reaction temperature, about 50 ℃ higher than that of the N2 plasma-treated catalyst. After the evaluation test, the deactivation rate of the novel catalyst was 1.7%, compared with 15.2% for the conventional catalyst. Different from the characterization results of the calcined catalyst, a smaller average pore diameter and a higher specific surface area were obtained for the plasma-treated catalyst. The variations of the reduction peak temperatures and areas indicated that the catalyst reducibility was promoted by plasma assistance. The dispersion of nickel was also remarkably improved, which was helpful for controlling the ensemble size of metal atoms on the catalyst surface. The modification effect of plasma- assisted preparation on the surface property of alumina supported catalyst was speculated to account for the concentration increase of absorbed CO2. An enhancement of CO2 adsorption was propitious to the inhibition of carbon formation. The coke amount deposited on plasma treated catalyst was much smaller than that on the conventional catalyst.