摘要
The LaCoO3 and 1%,10%,20%,30% doped Cu-LaCoO3 were prepared and studied. Two pretreated process were studied to investigate the effect of pretreating process of the catalysts on the reduction of SO2 by CO. One was using the mixture of SO2 and CO for catalysts sulfurized and poisoned in the presence of oxygen and the other was using SO2 and CO pre-reduced in the absence of oxygen. The evaluations were based on the SO2 conversion as well as sulfur selectivity and COS produced in a gradientless, quartz tubular packed-bed reactor. It was found that the catalysts sulfurized and poisoned under the mixture of SO2 and CO in the presence of oxygen could sustain its activity better than the pre-reduced catalysts. The activity decrease of the sulfurized and poisoned catalysts was very small after 4 h reaction. But for the two pre-reduced catalysts, SO2 conversion was only 17% over one 10% doped Cu-LaCoO3 and the other was deactivated after 140 min reaction. It was also found that all the doped Cu catalysts, sulfurized and poisoned in the presence of oxygen, presented higher oxygen resistance than the pre-reduced catalysts after reaction. The SO2 conversion of all the doped Cu catalysts decreased a little over 40 h reaction, while the activity of un-doped LaCoO3 was lowered to only 0.2 times of the initial activity. The other result showed that the COS formation was minimized in the doped Cu catalysts. From the results, it could be concluded that the 10% Cu-LaCoO3 was the most effective of the catalysts for removing sulfur with little COS formation.
The LaCoO3 and 1%,10%,20%,30% doped Cu-LaCoO3 were prepared and studied. Two pretreated process were studied to investigate the effect of pretreating process of the catalysts on the reduction of SO2 by CO. One was using the mixture of SO2 and CO for catalysts sulfurized and poisoned in the presence of oxygen and the other was using SO2 and CO pre-reduced in the absence of oxygen. The evaluations were based on the SO2 conversion as well as sulfur selectivity and COS produced in a gradientless, quartz tubular packed-bed reactor. It was found that the catalysts sulfurized and poisoned under the mixture of SO2 and CO in the presence of oxygen could sustain its activity better than the pre-reduced catalysts. The activity decrease of the snlfurized and poisoned catalysts was very small after 4 h reaction. But for the two pre-reduced catalysts, SO2 conversion was only 17% over one 10% doped Cu-LaCoO3 and the other was deactivated after 140 min reaction. It was also found that all the doped Cu catalysts, sulfurized and poisoned in the presence of oxygen, presented higher oxygen resistance than the pre-reduced catalysts after reaction. The S02 conversion of all the doped Cu catalysts decreased a little over 40 h reaction, while the activity of un-doped LaCoO3 was lowered to only 0.2 times of the initial activity. The other result showed that the COS formation was minimized in the doped Cu catalysts. From the results, it could be concluded that the 10% Cu-LaCo03 was the most effective of the catalysts for removing sulfur with little COS formation.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2006年第3期571-576,共6页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金资助项目(No.90210025
20476048)。
关键词
二氧化硫
一氧化碳
钴酸镧
铜掺杂
氧
sulfur dioxide
carbon monoxide
lanthanum cobaltate
doped copper
oxygen
