Abstract
The development of the global economy leads to a rising demand for light olefins, which are the basic chemical raw materials. Recently, a series of bifunctional catalysts consisting of metal oxide and zeolite have been reported to perform excellent light olefin selectivity from syngas and attract much attention. In this article, a new sulfide (MoS2)–zeolite (SAPO-34) composite catalyst was studied for syngas conversion to light olefins. It was found that the side reaction of methanation and hydrogenation of olefins to paraffins was suppressed by the introduction of potassium. Characterization results showed that the introduction of potassium could enhance the formation of K–Mo–S structure, at which the alcohol precursor formed. The optimized bifunctional catalyst MoS2–0.6K + SAPO-34 performed 12.5% CO conversion and 61.2% C2–C4 olefin selectivity.
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