Selective synthesis of dimethylamine over small-pore zeolites: III. HZK-5

Abstract

HZK-5 is a highly selective catalyst for dimethylamine (DMA) synthesis in the reaction of methanol and ammonia. Deep-bed (DB) calcination of NH 4ZK-5 containing 4 Cs uc results in DMA selectivities of 60–75% but with 15–30% dimethyl ether (DME) yields. Deep-bed or shallow-bed steam calcination of NH 4ZK-5 with only 1 Cs uc gives similar high DMA selectivities but lower DME yields of 5–10%. Shallow-bed calcination of NH 4ZK-5 results in DMA selectivities of ~45%. The activity of HZK-5 in the methylamine synthesis reaction is lower than that of zeolite HRHO.