CAJ | 학술논문

主要研究了钒钛基脱硝催化剂失活机理及再生。采用SEM、EDS、XRD、BET等手段对国内某家燃煤火电厂运行20000h的SCR脱硝催化剂进行表征,然后使用0.5mol/L的硫酸和0.01mol/L的氢氟酸对运行过的催化剂进行了清洗再生并通过烟气模拟-催化剂活性测试系统考察了催化剂的脱硝活性。结果表明,相比于新鲜催化剂,运行后的催化剂活性明显下降,孔容和比表面积有所下降,其表面存在着组成复杂的飞灰,飞灰主要成分为SiO2;采用0.01mol/L氢氟酸溶液清洗能够明显恢复催化剂的脱硝活性,这是因为氢氟酸可以有效清除失活催化剂表面的SiO2。
주요연구료범태기탈초최화제실활궤리급재생。채용SEM、EDS、XRD、BET등수단대국내모가연매화전엄운행20000h적SCR탈초최화제진행표정,연후사용0.5mol/L적류산화0.01mol/L적경불산대운행과적최화제진행료청세재생병통과연기모의-최화제활성측시계통고찰료최화제적탈초활성。결과표명,상비우신선최화제,운행후적최화제활성명현하강,공용화비표면적유소하강,기표면존재착조성복잡적비회,비회주요성분위SiO2;채용0.01mol/L경불산용액청세능구명현회복최화제적탈초활성,저시인위경불산가이유효청제실활최화제표면적SiO2。
Deactivation and regeneration of V2O5/TiO2 catalyst for elimination of NO were studied, lhe spent V2O5/TiO2 catalyst sample was from a domestic power plant, which had been operated for 20000h. The spent V2O5/TiO2 catalyst was characterized by SEM, EDS, XRD and BET techniques to reveal the deactivation mechanism. The regeneration of V2 O5/TiO2 catalyst was conducted by washing with aqueous solution of 0.5 mol/L H2SO4 or 0.01mol/L HF. The results showed that the actvity of the spent catalyst dropped greatly in comparison with the fresh catalyst. The reason was that the spent catalyst was heavily covered by ash which blocked the active sites and plugged the pores. After the spent catalyst was washed with aqueous solutions of 0.01mol/L HF, the activity of regenerated catalyst was improved significantly due to effective removal of sili- con dioxide covered on the spent catalyst, a main composition of the ash.