Study on arsenic poisoning for loading catalyst of V_2O_5-WO_3/TiO_2

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.