沸石分子筛表面分形维数与孔性质的关联分析  

Correlative analysis of fractal dimension and pore properties of the zeolite molecular sieve

作　　者：杨东奎[1] 王阔[2] 王继锋[2] 

机构地区：[1]辽宁石油化工大学,辽宁抚顺113001 [2]中国石油化工股份有限公司抚顺石油化工研究院,辽宁抚顺113001

出　　处：《工业催化》2014年第6期443-446,共4页Industrial Catalysis

摘　　要：为了研究模板材料对沸石分子筛表面形貌和孔结构性质的影响以及在焙烧除模板材料过程中分子筛表面复杂程度和孔道分布的变化,分别采用X射线衍射和氮气物理吸附-脱附对沸石分子筛进行表征,基于分形学理论引入分形维数及其计算,并将计算结果与分析结果进行对比讨论。结果表明,分形维数与分子筛表面的复杂程度密切相关,分子筛表面越复杂、沟壑越多,分形维数越大,反之则越小;模板材料影响分子筛不同指数晶面的生长速率和生长取向,进而影响分子筛的外观形貌和孔道结构性质,在焙烧除模板材料后,分子筛表面部分较大孔道发生塌陷,致使整体结构趋于平整化,分形维数减小。In order to investigate the effects of carbon template on surface morphology and the pore structure properties of zeolite molecular sieve, especially, the change of surface complexity and pore distribution of molecular sieve during the roasting process for carbon template removal, the samples were characterized by means of X-ray diffraction and N2 physical adsorption-desorption. The fractal dimension about the surface of zeolite molecular sieve was calculated basing on the fractal theory. The results coming from calculation were compared with the results of characterization. The results of analysis showed that the fractal dimension was positive correlated with the external complexity of molecular sieve. The more complex the surface of molecular sieve was, the bigger the fractal dimension was. In addition, the carbon template influenced growth rate and growth orientation of different indices of crystallographic plane of molecular sieve, and then affected surface morphology and pore structure properties of molecular sieve. After roasting, part of the larger pore of molecular sieve surface collapsed and the surface of molecular sieve tended to flatten, so the fractal dimension reduced.

关 键 词：催化剂工程 模板材料 分子筛 形貌 分形维数 

分 类 号：TQ426.1[化学工程] O643.36[理学—物理化学]