氮掺杂二氧化钛负载钒磷氧催化氧化NO的实验研究

NO oxidation catalyzed by vanadium phosphorus oxygen supported by nitrogen doped titanium dioxide

以VPO为活性组分,N掺杂TiO 2为载体,采用浸渍法制备了VPO/TiN催化剂,基于单因素实验研究了其对NO的选择性催化氧化(SCO)性能以及抗硫抗水性能。研究表明:当P/V为1/5、N/Ti为1、活性组分负载量为10%、焙烧温度为350℃时,催化剂的SCO活性最好,NO氧化率达到61%;光致发光光谱(PL)表征显示N掺杂TiO 2在催化剂表面形成的氧空位可增强催化剂对O 2的吸附;VPO/TiN催化剂抗硫抗水性能较强,反应后的催化剂表面未发现硫酸根的特征峰,水蒸气主要通过与NO竞争吸附占据活性位点来抑制催化剂的SCO活性。

A series of VPO/TiN catalysts were prepared by impregnation method with VPO as the active component and N-doped TiO 2 as the carrier.Based on single factor experiments,the selective catalytic oxidation(SCO)and sulfur and water resistance of VPO/TiN catalysts to NO were studied.Studies show that when P/V is 1/5,N/Ti is 1,the active component load is 10%and the roasting temperature is 350℃,the SCO activity of catalyst is the best and the oxidation rate of NO reaches 61%.The photoluminescence spectra(PL)showed that the oxygen vacancy formed by N-doped TiO 2 on the catalyst surface could enhance the adsorption of O 2;The VPO/TiN catalyst had strong sulfur and water resistance.Characteristic peak of sulfate was not found on the surface of the catalyst after the reaction.Water vapor inhibited the SCO activity of the catalyst mainly by competing with NO for adsorption on the active site.