Synthesis of large crystals of zeolite EMT and zeolite Y with elevated nSi/nAl-ratio
Large crystals of zeolite EMT with nSi/nAl = 3.5 to 3.8 were synthesized using 18-crown-6 as the structure-directing agent (SDA) and NaF as a mineralizer. By reducing the periods of gel ageing and homogenization or by increasing the SDA content of a previously reported synthesis, the crystal size of zeolite EMT could be increased from 2 to 3 μm up to 14.0 μm. With crystallization seeds, crystals with a size of 9.0 μm and large amounts of overgrowth were obtained. Crystals of zeolite Y with a size of up to 11.6 μm were also formed with an increased quantity of 15-crown-5 as the SDA. In this case, the crystallization was retarded and the resulting crystals were, again, covered by overgrowth.
C. Berger R. Gl(a)ser J. Weitkamp
Institute of Chemical Technology, University of Stuttgart, D-70550 Stuttgart, Germany
国际会议
北京
英文
2007-08-12（万方平台首次上网日期，不代表论文的发表时间）