CAJ | 학술논문

采用离子交换法制备了钛基层柱粘土(TiO2-PILC),并应用浸渍法将Mn负载于其上制得不同Mn含量的xMn/TiO2-PILCs催化剂,考察了催化剂低温NH3选择性催化还原NO (NH3-SCR)活性,研究了添加Ce对8％Mn/TiO2-PILC催化剂活性及其抗水蒸气抗SO2特性的影响.结果发现,TiO2-PILC负载的锰基催化剂具有良好的抗水蒸气性能,但在水蒸气和SO2共存时失活严重.Ce的添加对催化剂活性以及抗SO2能力均有所提高,其中8％Mn-2％Ce/TiO2-PILC在200 ℃时NO去除率达到95％,同时SO2失活速率明显比其他催化剂低.采用N2吸附-脱附、X射线衍射、NH3程序升温脱附、H2程序升温还原和X射线光电子能谱等技术对催化剂结构和性质进行了表征.结果表明,所制备催化剂具有丰富的中孔结构和较大的比表面积；Ce的添加使Mn在催化剂表面分散性更好,提高了催化剂表面酸性和催化剂氧化还原性能,从而使其活性和抗硫性能增加.
채용리자교환법제비료태기층주점토(TiO2-PILC),병응용침지법장Mn부재우기상제득불동Mn함량적xMn/TiO2-PILCs최화제,고찰료최화제저온NH3선택성최화환원NO (NH3-SCR)활성,연구료첨가Ce대8％Mn/TiO2-PILC최화제활성급기항수증기항SO2특성적영향.결과발현,TiO2-PILC부재적맹기최화제구유량호적항수증기성능,단재수증기화SO2공존시실활엄중.Ce적첨가대최화제활성이급항SO2능력균유소제고,기중8％Mn-2％Ce/TiO2-PILC재200 ℃시NO거제솔체도95％,동시SO2실활속솔명현비기타최화제저.채용N2흡부-탈부、X사선연사、NH3정서승온탈부、H2정서승온환원화X사선광전자능보등기술대최화제결구화성질진행료표정.결과표명,소제비최화제구유봉부적중공결구화교대적비표면적；Ce적첨가사Mn재최화제표면분산성경호,제고료최화제표면산성화최화제양화환원성능,종이사기활성화항류성능증가.
Titania-pillared clays (TiO2-PILC) were synthesized by ion exchange and manganese was introduced as the active phase.The catalytic behavior of the xMn/TiO2-PILC catalysts was studied for the low-temperature selective catalytic reduction (SCR) of NO with NH3.A series of Ce-doped 8％Mn-yCe/TiO2-PILC catalysts were prepared and evaluated for their performance in the low-temperature SCR of NO with NH3,their resistance to water vapor (H2O),and their resistance to sulfur dioxide (SO2).It was found that the NO conversion properties of the 8％Mr/TiO2-PILC catalysts could be significantly improved by adding Ce and all the catalysts gave high resistance to H2O but were sensitive to SO2.The catalyst with a Ce loading of 2％ gave 95％ NO conversion at 220 ℃ and exhibited a moderate SO2-poisoning resistance compared with the other catalysts.X-ray diffraction,N2 adsorption-desorption,temperature-programmed desorption of NH3,X-ray photoelectron spectroscopy,and temperature-programmed reduction of H2 were used to characterize the properties of the catalysts.The addition of Ce improved the diffusion of Mn on the surfaces of the catalysts,which enhanced the surface acidity and improved the reduction properties of the catalysts and these were the main influencing factors for the low-temperature SCR.