Synthetic zeolites are widely used in the refining and petrochemical industry. UOP has been very active in inventing and patenting new UOP Zeolitic Materials for use in catalytic and adsorptive processes. Many of these UZM’s have been invented using the charge density mismatch approach to zeolite synthesis as the CDM approach often allows preparation of unique structures or morphologies.[1] Recently, we have shown the impacts of CDM synthesis on solutions utilized to synthesize UZM-5 and UZM-9, members of the UFI and LTA zeotypes, respectively.[2] Several zeolitic frameworks possess both 10MR and 12MR channels in the same material and are of interest as catalysts with good conversion and shape selectivity. One of these is the MSE framework which contains a 12MR straight channel and two zig-zag 10MR channels. Known materials of the MSE framework include MCM-68 and YNU-2, often synthesized using a complicated bicyclic SDA. Recently, we have discovered the UZM-35 family of materials, also of the MSE zeotype, by utilizing the CDM approach to zeolite synthesis. A typical preparation utilizes dimethyldipropylammonium hydroxide in combination with sodium and potassium hydroxide from gels of about Si/Al=10 to yield UZM-35 after crystallization at 175C for 5-10 days.[3] UZM-35 is active in various catalytic transformations including catalytic cracking[4] and benzene alkylation.[5] A key question throughout catalytic testing was whether the material would give behavior more reminiscent of 10MR (MFI) or 12MR (beta) channels or some mixture of the two. In these reactions, UZM-35 shows behavior reminiscent of either 10MR or 12MR channels. Data from catalytic cracking and alkylation of benzene with ethylene or propylene will be used to attempt to explain the reasons behind the varied behavior of materials containing both 10MR and 12MR channels.

Charge density mismatch synthesis and application to UZM-35, a material containing both 10MR and 12MR pores

253rd National Meeting (2017)

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