SSZ-13

SSZ-13 (structure type CHA) is an aluminosilicate zeolite mineral belonging to the ABC-6 family of zeolites. Its chemical formula is RN_aNa_bAl_2.4Si_33.6O₇₂•wH₂O (1.4Chevron research Company in 1985 [Zones, S.I. "US Patent 4 544 538", 1985, ] , and has a potential use as a heterogenous catalyst for the MTO process.

ynthesis

CHA can be synthesized from the following method [Robson, H., Lillerud, K.P. (2001). "Verified Synthesis of Zeolitic Materials". Elsevier. ISBN: 0-444-50703-5 ] . 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 and3.22 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 160^oC in a teflonlined 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.

References