Catalytic Properties of ZnZrO<sub>x</sub> Obtained via Metal–Organic Framework Precursors for CO<sub>2</sub> Hydrogenation to Prepare Light Olefins
The conversion of CO<sub>2</sub> into light olefins over bifunctional catalysts is a promising route for producing high-value-added products. This approach not only mitigates excessive CO<sub>2</sub> emissions but also reduces the chemical industry’s reliance on fossil fuels....
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-03-01
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| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/15/4/380 |
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| Summary: | The conversion of CO<sub>2</sub> into light olefins over bifunctional catalysts is a promising route for producing high-value-added products. This approach not only mitigates excessive CO<sub>2</sub> emissions but also reduces the chemical industry’s reliance on fossil fuels. Among bifunctional catalysts, ZnZrO<sub>x</sub> is widely used due to its favorable oxide composition. In this work, ZnZrO<sub>x</sub> solid solution was synthesized by calcining an MOF precursor, resulting in a large specific surface area and a small particle size. Characterization studies revealed that ZnZrO<sub>x</sub> prepared via MOF calcination exhibited an enhanced CO<sub>2</sub> activation and H<sub>2</sub> dissociation capacity compared to that synthesized using the co-precipitation method. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) showed that CO<sub>2</sub> adsorption on ZnZrO<sub>x</sub> led to the formation of carbonate species, while HCOO* and CH<sub>3</sub>O* intermediates were generated upon exposure to the reaction gas. When ZnZrO<sub>x</sub> was combined with SAPO-34 molecular sieves under reaction conditions of 380 °C, 3 MPa, and 6000 mL·g_cat<sup>−1</sup>·h<sup>−1</sup>, the CO<sub>2</sub> conversion reached 34.37%, with a light olefin yield of 15.13%, demonstrating a superior catalytic performance compared to that of the co-precipitation method. |
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| ISSN: | 2075-4701 |