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以激光喇曼光谱控制气氛高温原位法,结合Auger和ESCA及小型工业实验装置,研究硫化态Ni-W/γ-Al_2O_3催化剂活性相的化学形态及其表面光谱特性。也考察了氧化态,硫化态以及由氧化态转变为硫化态时的条件和化学形态上间的转变关系。结果表明,目前有些催化剂采用的硫化条件是不理想的,表现为在硫化后催化剂的表面上主要组分是硫氧化物,尚有改进余地。并对硫化态催化剂的稳定性进行了研究。实验表明,在某种条件下硫化态催化剂也可以较长时间在空气中保留。小型工业实验装置对催化剂的评定结果和催化剂的表面光谱特性十分吻合。从而为Ni-W/γ-Al_2O_3催化剂硫化条件的选择提供了重要的依据。
The chemical morphologies and surface properties of the active phase of the sulfided Ni-W / γ-Al 2 O 3 catalyst were studied by laser Raman spectroscopy and high temperature in-situ method. Auger and ESCA combined with small-scale laboratory equipment were used. Also examined the oxidation state, the state of the sulfide and oxidation state into the state of the sulfide when the conditions and the chemical transformation of the relationship between the top. The results show that at present some of the catalysts used in the curing conditions are not ideal, the performance of the catalyst after curing the main component is sulfur oxide, there is room for improvement. The stability of the sulfided catalyst was also studied. Experiments show that under certain conditions, the sulfide catalyst can also be retained in the air for a long time. The result of the evaluation of the catalyst by the small industrial experiment device is in good agreement with the surface spectral characteristics of the catalyst. This provides an important basis for the selection of the curing conditions of the Ni-W / γ-Al 2 O 3 catalyst.