Organic Chemistry: Current Research
Open Access
ISSN: 2161-0401
+44 1478 350008
ISSN: 2161-0401
+44 1478 350008
Zhihua Lian and Hong He
Chinese Academy of Sciences, China
Posters & Accepted Abstracts: Organic Chem Curr Res
Nitrogen oxides have been a major source of air pollution, causing environmentally harmful problems such as photochemical smog, acid rain, ozone depletion and greenhouse effects. Selective catalytic reduction of NOx with NH3 (NH3-SCR) has been used extensively for the removal of NOx and the most widely used catalyst is V2O5-WO3 (MoO3)/TiO2. However, some problems still remain, such as the narrow operating temperature window of 300-400�?ºC, low N2 selectivity at high temperatures. Therefore, it is necessary to develop highly efficient low temperature SCR catalyst. In our previous study, we have developed a Nb-VOx/CeO2 catalyst, prepared by a homogeneous precipitation method, showing better NH3-SCR activity than VOx/ CeO2 catalyst. In this study, stronger resistance to H2O and SO2 over Nb-VOx/CeO2 catalyst than VOx/CeO2 was observed. When 5 vol.% H2O was introduced to the inlet gas at 250�?ºC, the NOx conversion over VOx/CeO2 decrease rapidly from 92% to 56%,while 100% NOx conversion over Nb-VOx/CeO2 catalyst was maintained all the time in the test. When 100 ppm SO2 was introduced to the inlet gas at 250�?ºC, the NOx conversion over VOx/CeO2 decreased from 95% to 24% in 48 hours and could not recover to the initial activity after the removal of SO2, while nearly 90% NOx conversion over Nb-VOx/CeO2 was obtained. The modification of Nb to VOx/CeO2 inhibited the formation of sulfate on the catalyst surface, resulting in the improvement of SO2 tolerance.
Zhihua Lian has completed her PhD in Environmental Science from Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences in the year 2015. She has published 5 SCI papers in reputed journals.
Email: zhlian@iue.ac.cn