Direct Conversion of Syngas to Light Olefins over a ZnCrO_x + H-SSZ-13 Bifunctional Catalyst

Citations Over Time

Abstract

In recent years, bifunctional catalysts for the syngas-to-olefins (STO) reaction via the oxide-zeolite (OX-ZEO) strategy has been intensively investigated. However, the bifunctional catalyst containing H-SSZ-13 with a 100% H+-exchanging degree for the STO reaction has not been developed because of the high selectivity to paraffin. Here, we report a ZnCrO _x + H-SSZ-13 bifunctional catalyst, which contains the submicron H-SSZ-13 with adequate acidic strength. Light olefins in hydrocarbon reached 70.8% at a CO conversion of 20.9% over the ZnCrO _x + H-SSZ-13(23S) bifunctional catalyst at 653 K, 1.0 MPa, and GHSV = 6000 mL·g-1·h-1 after 800 min of STO reaction. The effect of CO and H₂ on the C-C coupling was discussed by carrying out the methanol-to-olefins (MTO) reaction under a similar atmosphere as that of the STO reaction. H₂ and CO should play a more dominant role than the conventional hydrogen transfer reaction on the undesired high selectivity of paraffins. These findings provide new insight into the design of the bifunctional catalyst for the STO process via the OX-ZEO strategy.

Related Papers

• → Continuous Low-Temperature Methanol Synthesis from Syngas Using Alcohol Promoters(2003)61 cited
• → Heteroaggregation and Selective Deposition for the Fine Design of Nanoarchitectured Bifunctional Catalysts: Application to Hydroisomerization(2018)49 cited
• → Unravelling acidity–selectivity relationship in the bifunctional process of Fischer-Tropsch synthesis and catalytic cracking(2022)21 cited
• → Specifics of dimethyl ether synthesis from syngas over mixed catalysts(2016)1 cited
• → Highly Selective Bifunctional Iron-Zeolite Catalysts for the Production of Liquid-Range Hydrocarbons Via Fischer-Tropsch Synthesis: Correlation between Acidity and Hydrocarbon Distribution(2022)1 cited