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 °C is Ni 2 O 3 . After calcination at 550 °C, NiO species is formed on the activated carbon. NiO and Ni coexist on the Ni/AC catalyst calcined at 800 °C, and only pure Ni species is observed after calcination at 1000 °C. 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 °C exhibit good desulfurization activity, whereas the catalyst calcined at 400 °C 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.
采用过量浸渍法制备了䜕Ni/AC䜕催化剂,䜕考察了不同焙烧温度对䜕Ni/AC䜕脱硫活性的影响,䜕并通过䜕X䜕射线衍射和䜕X䜕射线光电子能谱对催化剂进行了表征,䜕研究了经不同温度焙烧后的催化剂上的䜕Ni䜕物种形态及其对催化剂性能的影响.䜕䜕结果表明,䜕经䜕400䜕䜕焙烧后的催化剂中䜕Ni䜕物种为䜕Ni 2 O 3 ,䜕550䜕C䜕焙烧后出现了䜕NiO䜕物种,䜕800䜕°C䜕焙烧后䜕Ni䜕物种变为䜕NiO䜕和䜕Ni䜕共存,䜕而䜕1 000䜕°C䜕焙烧后只存在单质䜕Ni.䜕䜕这说明不同温度焙烧后的催化剂中䜕Ni䜕形成了不同的化学形态.䜕䜕脱硫活性的测试结果表明,䜕经䜕550䜕°C䜕和䜕800䜕°C䜕焙烧后的催化剂表现出较好的脱硫活性,䜕而䜕400䜕°C䜕焙烧的催化剂脱硫活性最差.䜕䜕这说明䜕Ni䜕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,䜕而䜕NiO䜕是䜕Ni/AC䜕催化剂脱硫的主要活性物相.