溶液燃烧法制备Fe2O3/C及其催化苯甲醇制苯甲醛  

Synthesis of Fe2O3/C by solution combustion method for oxidation of benzyl alcohol to benzaldehyde

作　　者：孙琪[1] 吕丹阳[1] SUN Qi;L Danyang(School of Chemistry and Chemical Engineering,Liaoning Normal University,Dalian 116029,China)

机构地区：[1]辽宁师范大学化学化工学院

出　　处：《辽宁师范大学学报（自然科学版）》2020年第1期56-62,共7页Journal of Liaoning Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(21173110)

摘　　要：以硝酸铁为氧化剂,尿素为燃料,加入碳球载体,通过溶液燃烧法合成了Fe2O3/C复合材料.考察了引发溶液燃烧温度、燃烧时间对催化剂组成、结构、形貌的影响.结果表明,在不同引发燃烧温度下Fe2O3/C催化剂中Fe以α-Fe2O3或/和γ-Fe2O3晶体存在.前驱体在250、300、400℃引发燃烧,并保持20min,Fe2O3附着在碳球表面,形成粒径约200nm的球形结构;在400℃增加燃烧时间至60min,碳球被烧掉,得到粒径约200nm的空心泡状结构.这些材料在选择催化氧化苯甲醇制苯甲醛反应中显示了较高的活性.其中,400℃燃烧20min制得的Fe2O3/C催化剂活性最高.在优化条件下,苯甲醇的转化率和苯甲醛的选择性分别达到90.9%和87.7%.催化剂回收后,进行4次循环使用,显示了很好的稳定性.Fe2O3/C composites were synthesized by solution combustion method using ferric nitrate as oxidizer,urea as fuel,carbon sphere as a support.The effects of the molar ratio of the fuel to oxidant,combustion temperature and time on the composition,structure and morphology of the catalysts were investigated.The result indicated that the Fe2O3/C catalysts existed in two forms which wereα-Fe2O3 andγ-Fe2O3.When the precursor solution were maintained 20 min at 250,300,400℃.Fe2O3 was attached to the surface of the carbon sphere,forming a solid spherical structure with a particle size of about 200 nm.When the precursor solution were maintained 60 min at 400℃,the carbon sphere template was decomposed completely,and the hollow spherical structure with a particle size of about 200 nm was obtained.In the reaction of benzyl alcohol to benzaldehyde,the Fe2O3/C catalyst synthesized at 400 ℃ for 20 min showed the highest activity.Under the optimized conditions,the conversion of benzyl alcohol reached 90.9%,the selectivity of benzaldehyde was 87.7%.The catalytic efficiency was almost unchanged after 4 cycles.

关 键 词：苯甲醛 碳球 燃烧 苯甲醇 过氧化氢 

分 类 号：O643.322[理学—物理化学]