Effect of template combinations (TEA/MOR, TEA/DEA, DEA/MOR) in synthesis of nanostructured CoAPSO-34 catalyst used in conversion of methanol to light olefins

摘要

Current research was focused on the synthesis of CoAPSO-34 catalysts with various templates combination with the aim of reducing the preparation cost and implemented in methanol conversion to light olefins reaction. Three sets of mixed templates are taken into account for CoAPSO-34 synthesis, being TEA/morpholine, TEA/DEA and DEA/morpholine with constant composition of 50%: 50%. The catalysts were prepared via hydrothermal method and characterized with XRD, FESEM, PDS, EDX, BET, FTIR and NH3-TPD techniques. Nanostructured catalyst synthesized with DEA/morpholine mixture exhibited the highest crystallinity evidenced by XRD analysis. The catalyst prepared with TEA/DEA mixed template has the smallest particle size and the most uniform particle size distribution. The highest value of Si incorporation was obtained for the catalyst prepared with DEA/morpholine mixture shown by EDX analysis. Methanol to light olefins reaction was carried out at different reaction temperatures. The stability test was conducted maintaining at constant temperature, molar feed ratio and GHSV to distinguish the effect of time on stream. In comparison, later emergence of DME in the products stream for the catalyst prepared with DEA/morpholine can be due to its higher crystallinity, specific surface area, better Si distribution and higher structural OH bands evidenced by XRD, BET, EDX and FTIR techniques, respectively. (C) 2016 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.