期刊论文

Study on Perovskite Type La 1-x Sr xMnO 3 Catalysts for Complete Oxidation of Low Concentration Methanol

中文

厦门大学学报（自然科学版）

JOURNAL OF XIAMEN UNIVERSITY (NATURAL SCIENCE)

0438-0479

1999

15

1

61-66

10.3321/j.issn:0438-0479.1999.01.013

高等学校博士学科点专项科研项目

本校为其他机构

通过湿法造纸技术制备了微纤包覆活性炭复合材料,研究了甲苯和对二甲苯在基于微纤复合材料结构化固定床上的吸附透过行为.结果表明,颗粒活性炭被很好地包覆在烧结锁定的三维网络中,活性炭包覆前后的比表面积分别为976和955 m~2/g,微孔体积分别为0.261和0.247 cm~3/g:甲苯和对二甲苯在单一颗粒碳固定床和结构化固定床上的吸附均展示出竞争吸附特性,在两床层中均是甲苯先透过.在5%透过浓度下,甲苯和对二甲苯在结构化固定床上的透过时间较在颗粒碳固定床上分别延长了20和30 min,甲苯和对二甲苯分离时间增加了10 min.采用Yoon-Nelson模型对透过曲线进行拟合,相关系数R~2>0.98,甲苯和对二甲苯在结构化...

The perovskite type La 1-x Sr xMnO 3 catalysts were prepared by using sol gel method, and the catalytic activity for complete oxidation of methanol in low concentration was evaluated. The results showed that the partial substitution of Sr 2+ for La 3+ and the calcination temperature had pronounced effect on the performance of the catalyst for complete oxidation of methanol, with the activity of La 0.6 Sr 0.4 MnO 3 calcined at 873 K highest. XPS measurement demonstrated that enrichment of the A site metal elements at the surface occurred for all four La 0.6 Sr 0.4 MnO 3 samples calcined at temp...