Study on arsenic poisoning for loading catalyst of V₂O₅-WO₃/TiO₂

 The process of arsenic poisoning for the loading catalyst of V₂O₅-WO₃ /TiO₂ was simulated in the experiment. The poisoning characters of the catalyst were studied by means of activity testing, NH₃-TPD, H₂-TPR and XPS. The results show that after the poisoning of arsenic, the activity of catalyst decreases greatly. Meanwhile, the NH₃-TPD, H₂-TPR and XPS analyses show that the acidity of catalyst decreases with the poisoning of arsenic. The chemical forms of W and Ti do not change with the interaction of arsenic, but the chemical form of V changes greatly. So the poisoning of the catalyst is attributed to the changing of chemical form of V and the decreasing of acidity of the catalyst.