Light Olefin Synthesis from Syngas over Sulfide–Zeolite Composite Catalyst

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 (MoS 2 )−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 MoS 2 −0.6K + SAPO-34 performed 12.5% CO conversion and 61.2% C 2 −C 4 olefin selectivity.

The Active Nature of Crystal MoS2 for Converting Sulfur‐Containing Syngas

“…Under the conditions of 300–340 °C and 8.0–10.0 MPa, the selectivity of higher alcohols becomes more prominent ,. In the case of olefins, favorable conditions are slightly higher temperature of 360–400 °C and clearly lower pressure of 1.0–4.0 MPa ,,. If the desired product is methane, a wide range of temperatures (350–500 °C) and pressures (1.0–4.0 MPa) is commonly employed ,.…”

Advances in Catalytic Applications of Zeolite‐Supported Metal Catalysts

“…SAPO‐34 zeolites were the most commonly used zeolites in bifunctional catalysts to produce light olefins. To date, a series of metal species, such as ZnAl 2 O 4 , [ 20d,40 ] ZnGa 2 O 4 , [ 20d ] ZnZrO x , [ 20a ] Zr–Zn/Al 2 O 3 , [ 41 ] MnO x , [ 20b ] MoS 2 , [ 42 ] etc., have been integrated with SAPO‐34 zeolites to fabricate bifunctional catalysts, exhibiting excellent selectivity of light olefins for syngas conversion. In addition to SAPO‐34 zeolites, other 8‐membered rings (MRs) aluminosilicate and silicoaluminophosphate zeolites, such as SSZ‐13 (CHA), [ 20a ] SAPO‐18 (AEI), [ 12e ] and SAPO‐17 (ERI), [ 27 ] zeolites were also employed as active components in bifunctional catalysts for the highly selective production of light olefins from syngas conversion.…”

Direct conversion of syngas to aromatics: A review of recent studies

“…Nowadays, the single-reactor arrangement using composite catalysts is undergoing rapid development due to its simplicity and high efficiency [93,94]. In terms of the reaction performance, the in-situ tandem conversion of C1 intermediates from CO hydrogenation promotes a rightward shift in the reaction equilibrium, which results in a remarkable activity [95].…”