摘要
采用水热法制备了Zr-Ce-SBA-15(ZCS)介孔材料,并以它为载体,通过浸渍法制备了不同Cu/Mn比和Cu-Mn含量的Cu-Mn/ZCS催化剂.采用N2吸附-脱附、透射电镜、扫描电镜、X射线衍射和X射线光电子能谱(XPS)等手段对催化剂进行了表征,并在微型固定床反应器上评价了催化剂催化甲苯燃烧性能.结果表明,Cu-Mn/ZCS催化剂具有六方板状形貌和高度有序的短孔道介孔结构(孔道长0.4～0.5μm).20%Cu-Mn/ZCS催化剂的比表面积、孔体积和孔径分别为296m2/g,0.42cm3/g和6.4nm.与长孔道的20%Cu-Mn/SBA-15催化剂(孔道长1～2μm)相比,20%Cu-Mn/ZCS催化剂上甲苯燃烧反应的T95(转化率达95%以上的反应温度)从284oC降至270oC,表明短孔道Cu-Mn/ZCS催化剂具有更高的催化活性.
The mesoporous Zr-Ce-SBA-15 （ZCS） material with short mesochannels was synthesized through a hydrothermal route.A series of Cu-Mn/ZCS catalyst samples with different Cu/Mn ratios and Cu-Mn contents were prepared by impregnation.The structure of the catalyst samples was characterized by N2 adsorption-desorption,transmission electron microscopy,scanning electron microscopy,X-ray diffraction,and X-ray photoelectron spectroscopy.The catalytic performance of the catalyst for toluene combustion was evaluated in a fixed-bed microreactor.The results reveal that the Cu-Mn/ZCS catalyst has unique hexagonal platelet morphology and possesses highly ordered two-dimensional hexagonal mesoporous structure with short channels （0.4-0.5 μm）.The specific surface area,pore volume,and pore diameter of the 20%Cu-Mn/ZCS are 296 m2/g,0.42 cm3/g,and 6.4 nm,respectively.Compared with 20%Cu-Mn/SBA-15 with longer channel length （1-2 μm）,the temperature of 95% toluene conversion （T95） over 20%Cu-Mn/ZCS decreases from 284 to 270 oC,indicating that the short channeled Cu-Mn/ZCS catalyst possesses higher catalytic activity than that over Cu-Mn/SBA-15.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2011年第6期1069-1075,共7页
基金
国家自然科学基金(51078184)
高等学校科技创新工程重大项目培育资金(708049)
江苏省自然科学基金(BK2009392)
南京理工大学自主科研专项计划(2010ZDJH03)~~
关键词
短孔道
铜
锰
锆
铈
SBA-15分子筛
甲苯
催化燃烧
short mesochannel
copper
manganese
zirconium
cerium
SBA-15 zeolite
toluene
catalytic combustion
