摘要
利用高温高压一步法合成系列Al Mn-复合柱化剂,该方法的步骤、物料消耗等较传统制备方法均大大减少,可大大降低生产成本及减少对环境的污染。通过离子交换合成系列Al Mn复合柱撑粘土（Al Mn-PILC）。改变Al/Mn摩尔比、老化温度、老化时间,可调控Al Mn-复合柱化剂的结构,从而影响Al Mn-PILC的结构性能（包括比表面积、孔体积、孔径、层间距等）。通过XRD,N2吸附,高分辨电镜及程序升温还原等实验对材料的结构及性能进行了表征。结果表明：经550℃焙烧4 h后,Al Mn-PILC的比表面积和孔体积可达174.2~246.7 m^2·g^-1和0.126~0.158 cm^3·g^-1,层间距可达1.85 nm。经柱撑改性合成的Al Mn-PILC,其负载Cr Ce催化剂对氯苯的催化降解性能远高于原土（Nammt）和单核Al-PILC的,尤其以Cr Ce（9∶1）/Al Mn-PILC的催化活性最佳,在250℃时可完全降解低浓度的氯苯,是一类性能优异的用于有机物催化降解的多孔材料。
A high-temperature and high-pressure method was used to synthesize a composite Al Mn pillaring agents in one step. Compared with conventional methods,our method considerably reduces the number of steps and the material consumption and thus greatly reduces the production costs and resulting environmental pollution. A series of composite Al Mn-pillared clays（ Al Mn-PILC） were synthesized via ion exchange. The structure of the composite Al Mn pillaring agents could be modified by changing Al / Mn molar ratio,reaction temperature,and reaction time,thereby affecting the structure and properties of Al Mn-PILC（ including specific surface area,pore volume,pore diameter,and interlayer spacing）. The structure and performance of the experimental materials were characterized via X-ray diffraction（ XRD）,N2 adsorption experiments,high-resolution transmission electron microscopy（ HRTEM）-energy dispersive X-ray spectroscopy（ EDX）. The results demonstrated that after 4 h of calcination at550 ℃,the specific surface area,pore volume,and maximum interlayer spacing of Al Mn-PILC reached 174. 2 ~246. 7 m^2·g^-1,0. 126 ~ 0. 158 cm^3·g^-1,and 1. 85 nm,respectively. The synthesized Al Mn-PILC outperformed the raw clays（ Na-mmt） and mononuclear Al-PILC in the catalytic degradation of chlorobenzene. In particular,Cr Ce（ 9∶ 1） / Al Mn-PILC exhibited the highest catalytic activity and was able to completely degrade a low concentration of chlorobenzene at 250 ℃,proving it to be a class of porous materials with superior performance in the catalytic degradation of organic materials.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2015年第2期156-164,共9页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(21203124)
绍兴市科技局项目(2012B70023)
绍兴市大学生科技创新项目
关键词
AlMn-柱撑粘土
一步水热法
表征
催化降解
CVOC
稀土
A1Mn-pillared clay
one-step hydrothermal method
characterization
catalytic degradation
chlorobenzene
rare earths
