高酸性ZrMCM-41分子筛的合成和表征

以硅酸钠为硅源、以硝酸氧锆为锆源 ,在接近中性的条件下合成出了Si/Zr比 2 0～∞的 ,具有高比表面和良好晶体性的含锆MCM - 41分子筛 .锆的引入使分子筛的B酸和L酸线性增加 .至少有大约三分之一的锆原子以 (≡Si-O) 3Zr=O]-的形式处在表面或接近表面 ,在合成样品中它由钠离子补偿 ,经氢离子交换转变成酸性中心 .

Synthesis and characterization of highly acidic ZrMCM-41 molecular sieves

Zirconium containing MCM-41 molecular sieves with high surfacearea， good crystallinity and Si / Zr ratio from 20 - ∞ were synthesized in a near neutral condition by using a sodium silicate as silicon source and a zirconyl nitrite as zirconium source. The introduction of zirconium into the molecular sieve resulted in a linear increasing of B and L acidic sites of the solid. At least one third of zirconium is on the surface or near the surface in the form of (≡Si-O)3Zr=O]-. The surface zirconyl species as centers of negative charge compensated by sodium ions presents a property of ion exchange.