SSZ-13

SSZ-13 (structure type CHA) is an aluminosilicate zeolite mineral belonging to the ABC-6 family of zeolites. Its chemical formula is RNaNabAl2.4Si33.6O72•wH2O (1.4<a<27)(0.7<b<4.3)(1<w<7), where RN is N,N,N-1-trimethyladamantammonium. The material was patented by Chevron research Company in 1985,[1] and has a potential use as a solid catalyst for the methanol-to-olefins (MTO) process.

Synthesis

CHA can be synthesized from the following method.[2] The material is synthesized from the following batch composition:

10 Na2 : 2.5 Al2O3 : 100 SiO2 : 4400 H2O : 20 RN-OH.

2 g 1N NaOH, 2,78 g 0.72 M N,N,N-1-trimethyladamantammoniumhydroxide and 3.22 g deionized water are mixed. 0,1 g Al2O3 is added to the solution and mixed with 0.6 g fumed silica). The resulting viscous gel is aged for two hours and heated for 4 days at 160oC in a teflon lined steel autoclave.

Uses

SSZ-13 is a high silica zeolite with the CHA topology. Materials with this topology are of industrial interest, as potential catalysts for application in the methanol-to-olefins (MTO) reaction.

See also

References

  1. ↑ Zones, S.I. US Patent 4 544 538, 1985,
  2. ↑ Robson, H., Lillerud, K.P. (2001). Verified Synthesis of Zeolitic Materials. Elsevier. ISBN 0-444-50703-5