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研究了以冷轧工艺制备的Ni3Al单晶箔(Ni-24at%Al),以及表面预处理(873 K下蒸汽氧化后还原处理)后的Ni3Al箔,在甲烷重整制氢反应中的催化性能.首先,采用逐步升温法研究了873～1173 K下Ni3Al箔的催化活性与温度的关系;然后,采用等温法研究了973 K下Ni3Al箔的催化稳定性.根据催化反应和扫描电镜显微观察的结果得出:未经预处理和经过预处理的Ni3Al箔,在反应中均显示出一定的催化活性和稳定性;表面预处理对Ni3Al箔的催化活性有显著的增强作用,原因是经过该预处理后的Ni3Al箔形成了富Ni表面;Ni3Al箔在甲烷重整反应的气氛中,Ni原子从Ni3Al基体向表面的移动,是维持催化活性的主要原因.
The Ni3Al single-crystal foil (Ni-24at% Al) prepared by cold rolling process and the Ni3Al foil after pretreatment (steam oxidation and reduction treatment at 873 K) were studied. The catalytic performance in the hydrogen reforming of methane reforming The catalytic activity of Ni3Al foils at 873 ~ 1173 K was studied by means of the step-up method, and then the catalytic stability of Ni3Al foils at 973 K was investigated by isothermal method.According to the catalytic reaction and scanning electron microscopy The results showed that the Ni3Al foil without pretreatment and pretreatment showed a certain catalytic activity and stability in the reaction; Surface pretreatment significantly enhanced the catalytic activity of Ni3Al foil, because after the Ni3Al foil pre-treated to form a Ni-rich surface; Ni3Al foil in the methane reforming reaction atmosphere, Ni atoms from the Ni3Al substrate to the surface of the movement is to maintain the catalytic activity of the main reason.