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用原位激光喇曼光谱测得了硫化态W/γ-Al_2O_3催化剂在不同条件下的喇曼光谱。选择了一些典型的钨化合物,研究了它们的硫化条件和化学形态之间的关系,发现AMT最容易硫化,H_2WO_4处于中等,而WO_3最难硫化。本文应用控制气氛高温原位激光喇曼光谱,配合以俄歇能谱及ESCA能谱研究了氧化态和硫化态催化剂上活性组分的化学形态。在氧化态催化剂表面上发现了两种化合物:聚钨酸和聚集态WO_3。在硫化态催化剂表面上也发现了两类化合物:WS_2和硫氧化钨以及非活性组分的WO_3。而WS_2则是从聚钨酸转变而来,是催化剂加氢脱氮(HDN)的主要活性物。
Raman spectra of sulfided W / γ-Al 2 O 3 catalysts were measured by in-situ laser Raman spectroscopy under different conditions. Some typical tungsten compounds were selected and the relationship between their curing conditions and chemical forms was studied. It was found that AMT was the most easily sulfidized, H_2WO_4 was moderate, and WO_3 was the most difficult to sulfidize. In this paper, controlled atmosphere high temperature in-situ laser Raman spectroscopy was used to study the chemical state of the active components in the oxidation state and the sulfide state catalyst with Auger energy spectrum and ESCA spectrum. Two compounds were found on the surface of oxidized catalyst: polytungstic acid and aggregated WO_3. Two types of compounds were also found on the surface of the sulfided catalyst: WS 2 and WO 3 and WO 3 as an inactive component. WS_2 is a transition from polytungstic acid, which is the main active of HDN.