Synthesis of Light Olefins from Oxygenated Organic Compounds over Metallosilicates with MFI and MTW-type Zeolite Structures

Abstract

Selective production of light olefins over zeolite catalyst requires control of consecutive reactions because the objective products are intermediates. In catalytic reactions using zeolite, the diffusion resistance of both the raw material and products within the crystal, and acid site strength of the zeolite, strongly affect the catalyst activity and selectivity. This review describes the preparation of macro-, and nano-sized ferrisilicate and ferroaluminosilicate with MFI and MTW-type zeolite structures and their application to the production of light olefins from oxygenated organic compounds such as acetone and methanol. Nano-sized ferrisilicate with MFI-type zeolite structure showed more stable activity compared to macro-sized zeolite in the acetone to olefin and methanol to olefin reactions. Moreover, metallosilicates containing Fe atoms in the zeolite framework had higher selectivity for light olefins compared to aluminosilicate due to suppression of the consecutive reactions forming aromatics and coke. Ferroaluminosilicate containing two types of Brønsted acid sites, derived from both Fe and Al atoms in the framework, was the most effective catalyst for the production of light olefins from methanol.