铜对Mn/Al_2O_3氨还原SO_2到单质硫催化性能的影响

ＳＯ2 是危害最为严重的大气污染物之一 ,也是造成酸雨的元凶。将ＳＯ2 选择性还原为单质硫 ,既能消除ＳＯ2 对环境的污染 ,又能回收单质硫 ,具有特别重要的意义。根据所用的还原剂的不同 ,催化还原ＳＯ2 到单质硫可分为Ｈ2 、炭、烃类 (主要是ＣＨ4 )、ＣＯ和ＮＨ3还原法1] 。氨还原法是基于氨的催化分解生成Ｎ2 和Ｈ2 混合气 ,其中的Ｈ2 再还原ＳＯ2 到硫和Ｈ2 Ｓ ,然后进行高温Ｃｌａｕｓ反应生成单质硫。Ｐａｉｋ2 ] 等以第四周期过渡金属硫化物载于Ａｌ2 Ｏ3 作为催化剂 ,研究了Ｈ2 还原ＳＯ2 为单质硫的反应 ,认为过渡金属硫化物是…

EFFECT OF COPPER COMPONENT ON CATALYTIC PROPERTY OF Mn/Al_2O_3 FOR REDUCING SO_2 TO ELEMENTAL SULFUR WITH AMMONIA

The catalytic performance of sulfided Mn/Al 2O 3 and Cu-Mn/Al 2O 3 catalysts for the ammonia decomposition has been studied by using a fixed-bed flow apparatus. It is found that the addition of copper component to Mn/Al 2O 3 catalyst can increase its catalytic activity for ammonia decomposition. The results of TPR indicate that the existence of copper component significantly improves the reduction of catalysts, which is beneficial to form active metal sulfide phase to catalyze the reduction of SO 2 to H 2S by hydrogen. X-ray diffraction results reveal that the Cu-Mn/Al 2O 3 catalyst (n Cu /n Mn =0.4) contains a CuMn 2O 4 phase before reaction, and displays MnS peaks after reaction.