摘要
首次以β沸石作为硅铝源制备了β沸石/MCM-41微孔-介孔复合分子筛材料,通过XRD、IR、N2吸附脱附、SEM和水热处理等手段对复合材料进行了表征,并与MCM-41和β沸石及二者的机械混合物的有关性能进行了对比研究。结果表明,复合分子筛明显不同于机械混合物,其水热稳定性远远高于普通方法合成的介孔分子筛,而且发现通过改变体系的nNa/nSi比,可以调变复合样品中的微孔、介孔相的相对含量。
The β-zeolite/MCM-41 binary-molecular sieve composite has been synthesized by using a novel approach, in which zeolite Beta was used as silica-alumina source of mesoporous phase. Moreover the amount of mesostructure in the composite was able to be controlled just by varying the nNa/nSi. The products were characterized by XRD, FTIR, N2 adsorption/desorption, SEM and hydrothermal treatment methods. XRD patterns of the composite showed the peaks for both β-zeolite and mesoporous molecular sieve with hexagonal symmetry. Framework vibration modes and morphology of the composite were different from those of a physical mixture of MCM-41 and β-zeolite. The characterization results also showed that the hydrothermal stability of the mesoporous phase in the composite material was greatly improved, which is believed to be related with the mesoporous structure that formed during the assembly of dissolved fragments of β-zeolite with the surfactant molecules together with a lot of zeolite secondary building units.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2005年第10期1455-1459,共5页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.20476060)
国家重大基础研究项目(No.(973)2004CB217806)资助
关键词
Β沸石
介孔分子筛
复合
水热稳定性
β-zeolite
mesoporous molecular sieve
composite
hydrothermal stability
