稀土元素催化活化制备中孔炭  

Synthesis of mesoporous carbon by catalytic activation using rare earth elements

作　　者：李艳秋[1,2] 李开喜[1] 

机构地区：[1]中国科学院山西煤炭化学研究所中国科学院炭材料重点实验室,山西太原030001 [2]中国科学院研究生院,北京100049

出　　处：《新型炭材料》2010年第3期181-186,共6页New Carbon Materials

基　　金：科技部国际合作项目(2010DFB90690-4);山西省国际合作项目(2010081031-2)~~

摘　　要：以线型酚醛树脂为前驱体,采用溶液混合法将Y(NO3)3或Ce(NO3)3掺杂在其中,通过水蒸气活化制备含有大量中孔的酚醛树脂基活性炭。利用红外光谱(IR)、热重(TG)分析、N2吸附、扫描电镜(SEM)等对酚醛树脂以及其相应的活性炭进行表征。结果表明:掺杂Y(NO3)3或Ce(NO3)3可以提高水蒸气活化的速率,促进孔的发展。由于稀土金属盐与酚醛树脂前驱体相容性的限制,Y(NO3)3或Ce(NO3)3的催化效率随着其在树脂中含量的增加先增大后减小。其中,Y(NO3)3可以同时促进中孔和微孔的发展,且促进微孔发展的作用更强一些,而Ce(NO3)3则在促进中孔的发展中显示出较大的优势。Y（ NO3 ） 3 or Ce （ NO3 ） 3 was doped into novolac-type phenolic resin with a solution mixing method, and phenolic resin-based activated carbons rich in mesopores were obtained by steam activation. The as-prepared samples were characterized by infrared spectroscopy, thermogravimetry, nitrogen adsorption and scanning elec- tron microscopy. Results indicate that the doping of Y（ NO3 ）3 or Ce（ NO3 ）3 into phenolic resin is favorable for the activation of phenolic resin-based carbon in steam, improving the activation rate and promoting the formation of pores. The efficiency for carbon gasification increases with increasing catalyst content and reaches a maximum at 4% by weight for both catalysts. The maximum is thought to be due to the agglomeration of metal particles and a decreasing of contact surface area between carbon and metal particles at the high metal content. Y （ NO3 ） 3 can accelerate the formation of micropores and mesopores simultaneously with the former more developed. However, Ce （NO3） 3 shows an obvious effect on the development of mesopores.

关 键 词：酚醛树脂 中孔炭 稀土 催化活化 孔径分布 

分 类 号：TQ424.1[化学工程]