三氧化二镍改性活性焦的脱硫性能及机理  

Desulfurization performance and mechanism of activated coke modified by Ni_2O_3

作　　者：蒋金池 黄田[1] 杨志山[1] 

机构地区：[1]四川大学建筑与环境学院,成都610065 [2]同济大学环境科学与工程学院,上海200092

出　　处：《环境工程学报》2015年第10期4953-4958,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51378324)

摘　　要：以烟煤为原料、Ni2O3为添加剂共混制备了改性活性焦,研究了Ni2O3不同负载量对改型活性焦脱硫性能的影响,当Ni2O3添加量为12%时,穿透硫容和时间达到最大值,分别为142.77 mg/g和29.5 h,与未改性活性焦相比,穿透硫容增加44.7%,穿透时间延长12.83 h。对改性活性焦进行了BET、FTIR、XRD和XPS分析,表明Ni2O3改性活性焦以微孔为主,表面存在醇、羧酸、酚或醚类官能团。改性活性焦的脱硫机制包括:Ni在活性焦表面形成一种活性中间体Ni-C,在H2O和O2存在条件下,氧化SO2生成硫酸或者硫酸盐;吸附态的SO2与低价态的金属氧化物Ni O接触反应生成硫酸盐。Activated coke was prepared from bituminous coal with Ni2O3 as additives. The influence of Ni2O3 loading amount on the desulfurization performance was studied. With the optimal Ni2O3 loading amount（ 12 wt. %）,the breakthrough sulfur capacity and time of activated coke were observed to be 142. 77 mg /g and29. 5h,respectively. Compared with the blank sample,the breakthrough sulfur capacity increased 44. 7% and breakthrough time extended to 12. 83 h. BET,FTIR,XRD and XPS were employed to explore the surface properties of the activated coke. And the results showed that the micropores took the majority of the pores structure of the Ni2O3 loaded activated coke. Alcohol,phenol,ether and carboxylic functional groups were detected on the surface of the modified activated coke. The desulfurization mechanism of Ni2O3 loaded activated coke can be described by two pathway,firstly,the formed active intermediate oxidize SO2 into sulfuric acid or sulfate with the presence of steam and oxygen in the system,the other pathway is that the absorbed SO2 could directly react with Ni O and form sulfate.

关 键 词：活性焦 三氧化二镍 脱硫 

分 类 号：X703[环境科学与工程—环境工程]