采用过量浸渍法制备了Ni/AC催化剂,考察了不同焙烧温度对Ni/AC脱硫活性的影响,并通过X射线衍射和X射线光电子能谱对催化剂进行了表征,研究了经不同温度焙烧后的催化剂上的Ni物种形态及其对催化剂性能的影响.结果表明,经400℃焙烧后的催化剂中Ni物种为Ni_2O_3,550℃焙烧后出现了NiO物种,800℃焙烧后Ni物种变为NiO和Ni共存,而1000℃焙烧后只存在单质Ni.这说明不同温度焙烧后的催化剂中Ni形成了不同的化学形态.脱硫活性的测试结果表明,经550℃和800℃焙烧后的催化剂表现出较好的脱硫活性.而400℃焙烧的催化剂脱硫活性最差.这说明Ni在催化剂上的不同化学形态是造成脱硫效果差异的主要原因,而NiO是Ni/AC催化剂脱硫的主要活性物相.
A series of Ni/AC catalyst samples were prepared by excessive impregnation, and the desulfurization activity of Ni/AC calcined at different temperatures was investigated. The Ni species on the Ni/AC catalyst calcined at different temperatures were studied by X-ray diffraction and X-ray photoelectron spectroscopy. The characterization results showed that the Ni species on the catalyst calcined at 400℃ is Ni_2O_3. After calcination at 550℃, NiO species is formed on the activated carbon. NiO and Ni coexist on the Ni/AC catalyst calcined at 800℃, and only pure Ni species is observed after calcination at 1000℃. This suggested that Ni can form different chemical states on the Ni/AC catalyst calcined at different temperatures. The desulfurization test results showed that the catalysts calcined at 550 and 800℃ exhibit good desulfurization activity, whereas the catalyst calcined at 400℃ has poor activity, indicating that different chemical states of Ni on the Ni/AC catalyst show different desulfurization performance, and NiO is the main active phase of the Ni/AC catalyst.
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