Dual-templated synthesis of Si-rich [B]-ZSM-5 for high selective light olefins production from methanol

Document Type: Original research

Authors

1 Faculty of Chemical Engineering, Sahand University of Technology, Sahand New Town, Tabriz, Iran, P.O. Box: 51335-1996

2 Research Center of Environmental Engineering, Sahand University of Technology, Sahand New Town, Tabriz, Iran, P.O. Box: 51335-1996

10.22063/poj.2021.2852.1176

Abstract

Methanol dehydration is a high potential route for the production of light olefins (C2-C4). In this study, hierarchical Si-rich [B]-ZSM-5 catalysts (Si/Al=200) were prepared through one-pot hydrothermal synthesis, including boron as a promoter and ethanol as a low-cost secondary template. N2 adsorption-desorption, XRD, FE-SEM, and FT-IR techniques were applied to characterize the catalysts. The effect of different amounts of ethanol and different operating conditions was studied on the ZSM-5 catalyst preparation and performance in methanol to olefins (MTO) reaction. The results showed that the optimum amount of ethanol (ethanol/TPABr=5) led to the highest crystallinity (91.2%), the highest specific surface area (>400 m2g-1), and total pore volume (0.19 cm3g-1). The best catalytic performance was obtained at temperature of 480°C and methanol hourly space velocity (WHSV) of 7.2 h-1. The optimum catalyst had the highest propylene selectivity (58%) and light olefin selectivity (85%). The results proved the high capability of the new strategy for the efficient and fast development of the MTO catalyst.

Keywords



Articles in Press, Accepted Manuscript
Available Online from 10 April 2021
  • Receive Date: 20 February 2021
  • Revise Date: 07 April 2021
  • Accept Date: 10 April 2021