Studies On Low-temperature Selective Catalytic Reduction Denitration Performance Over Fe-Ce Catalysts

The rapid development of the power industry in China not only bring convenience to the economic development and people’s lives,but also bring a variety of environmental problems and the nitrogen oxides produced by power plants have become a major source of air pollution.In addition to the formation of acid rain to destroy forests,soil,lakes and so on,nitrogen oxides also form into chemical smoke pipes which are harmful to human health seriously.Thus it is necessary to strengthen the control of nitrogen oxides pollution in which NO is a main component.In order to reduce the atmospheric emissions of nitrogen oxides,the selective catalytic reduction(SCR)denitration method is one of the most effective and most promising technologies for the removal of nitrogen oxides pollution and the key issue of SCR denitration method is to choose a good catalyst.In my paper,the SCR denitration performance of the Fe-Ce-Ox catalysts using SBA-15,KIT-6 as a template and the modified mesoporous carbon loaded with Fe-Ce-Ox catalysts were studied.For the Fe-Ce-Ox catalysts using SBA-15,KIT-6 as a template,the effects of Fe/Ce molar ratio and gas hourly space velocity(GHSV)were investigated.Results showed that the FeCe(6:1)Ox catalyst showed higher NO conversion than any other catalysts and the SCR denitration performance of FeCe(6:1)Ox catalysts using SBA-15 as a template is better than that of FeCe(6:1)Ox catalysts using KIT-6 as a template.And the FeCe(6:1)Ox catalysts using SBA-15 as a template had a good SCR denitration performance at high GHSVs.In addition,the stability and sulfur-poisoning resistance of the FeCe(6:1)Ox catalysts using SBA-15 as a template were studied.It was found that the FeCe(6:1)Ox catalysts had a good stability and sulfur-poisoning resistance at 200-300 ℃.For the modified mesoporous carbon catalysts loaded with the FeCe(6:1)Ox,the effects of load ratio,GHSVs,the stability and sulfur-poisoning resistance on the SCR denitration performance were explored.The results showed that the modified mesoporous carbon loaded with 20% FeCe(6:1)Ox,could achieve above 83% NO conversion at 170-270 ℃ which indicated that it had a good low-temperature SCR denitration performance.Compared with the FeCe(6:1)Ox catalysts using SBA-15 as a template,the modified mesoporous carbon loaded with 20% FeCe(6:1)Ox had better SCR denitration performance.This might be due to joint action of the good diffusion of gas molecules on the catalyst surface for mesoporous structure of modified mesoporous carbon and the excellent electron transfer orbit provided by FeCe(6:1)Ox.In addition,it was found that the the modified mesoporous carbon loaded with 20% FeCe(6:1)Ox had a good stability at 200-230 ℃ and sulfur-poisoning resistance at 230 ℃.