固体炭对一氧化氮低温催化解离还原反应的影响——Ⅱ.复合催化剂中铁在载体炭上化学形态的研究  

STUDY ON THE CATALYTIC DECOMPOSITION REDUCTION OF NO BY CARBON——Ⅰ. STUDY ON THE CHEMICAL STATE OF IRON IN THE CARBON SUPPORTED COMPOSITE CATALYST

作　　者：任杰[1] 毛子素[1] 杨学仁[1] 

机构地区：[1]中国科学院山西煤炭化学研究所,太原030001

出　　处：《燃料化学学报》1993年第4期380-386,共7页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金

摘　　要：用^(57)Fe穆斯堡尔谱研究了炭载型复合催化剂中铁化学形态随温度的变化,及各活性组分、助剂对铁化学形态的影响;并通过ESR谱考察了复合催化剂中不同活性组分对铁在载体炭表面电子特性的影响。研究结果表明,复合催化剂中各活性组分、助剂和载体炭与铁之间存在着强相互作用。在350～650℃,载体炭可将铁从Fe_2O_3还原到Fe_3O_4、FeO、α-Fe和生成炭化铁。活性组分Cu和助剂K可改变催化剂中铁周围的电子密度,促进铁在载体炭上从高价态向低价态还原。同时还发现催化剂中Na和Cr对铁有很强的助分散作用。The change of chemical state of iron with increasing temperature of treatment and the effects of various active phases and promoters on the chemical state of iron in the carbon supported catalyst for the reduction of NO were investigated by means of^(57)Fe Mssbauer spectroscopy. Electron spin resonance was used to examine the electronic behavior of iron in carbon supported composite catalysts with different component. The results show that there exists strong interaction between iron and other active phases, promoters and carbon. Ferric oxide can be reduced to Fe_3O_4、FeO、α-Fe and Fe_3C by carbon over the temperature range of 350℃ to 650℃. Active phase Cu and promoter K can alter the electronic density around iron in the composite catalyst and improve the reduction tendency of iron by carbon. It was also found that Na and Cr have a very strong effect on the improvement of iron dispersion.

关 键 词：铁 铜 活性炭 催化剂 一氧化氮 

分 类 号：O643.36[理学—物理化学]