Promotional Effect of Titanium on the Catalytic Performance of Anodic Alumina Supported Silver Catalyst for the Selective Reduction of NO with Propene

作者：Chen Jian; Guo Yu^*; Uesawa Nobuhisa; Zhou Lu; Li Huabo; Yao Yi; Zhang Qi; Ying Weiyong; Sakurai Makoto; Kameyama Hideo

来源：Journal of Chemical Engineering of Japan, 2009, 42(3): 172-183.

DOI：10.1252/jcej.08we200

• Selective Catalytic Reduction
• Anodic Alumina Support
• Silver
• Titanium
• Promotional Effect

A series of anodic alumina supported silver/titanium catalysts (Ag/Ti/Al(2)O(3)) were synthesized to investigate the effect of Ti on the selective catalytic reduction of NO with propene.
In the low temperature region, the SCR activity was greatly enhanced on Ag/Ti/Al(2)O(3) compared to Ag/Al(2)O(3,) and this promotion became more significant with increasing Ti loading. Adding Ti to an anodic alumina support did not cause obvious improvement of activity, indicating that the presence of Ti acted as a catalytic promoter of Ag, but did not directly participate in the SCR reaction. The result of NO(x)-TPD in flowing. He showed that no obvious difference in the desorption performance of ads-NO(x) species was found between Ag/Al(2)O(3) and Ag/Ti/Al(2)O(3.) However, in flowing O(2)/C(3)H(6)/He the desorption peak of nitrate species was decreased by about 50 degrees C when Ti was present. The promoted partial oxidation of the reducing agent was believed to be a main reason. The result of H(2)-TPR suggested that besides Ag( ) ion and metallic Ag another type of silver existed in Ag/Ti/Al(2)O(3,) possibly a moderately agglomerated Ag(n)(5) cluster.
Additionally, in comparison with SO(2)-aged Ag/Al(2)O(3) catalyst, the SO(2)-aged Ag/Ti/Al(2)O(3) catalyst provided a favorable tolerance to SO(2) poisoning, and led to higher activity. A relatively lower SO(2) adsorption amount and a faster reduction rate of sulfate species by propene were considered to be a reasonable interpretation.

• 出版日期2009
• 单位东华大学