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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2025-03-01
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| author | Rundong Cai Heping Zheng Hong Liang Xiankun Chen Jianhua Tang |
| author_facet | Rundong Cai Heping Zheng Hong Liang Xiankun Chen Jianhua Tang |
| author_sort | Rundong Cai |
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| description | 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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| spelling | doaj-art-5d9bfd43b2ce40aba24a3fe013bde0ee2025-08-20T02:28:15ZengMDPI AGMetals2075-47012025-03-0115438010.3390/met15040380Catalytic Properties of ZnZrO<sub>x</sub> Obtained via Metal–Organic Framework Precursors for CO<sub>2</sub> Hydrogenation to Prepare Light OlefinsRundong Cai0Heping Zheng1Hong Liang2Xiankun Chen3Jianhua Tang4College of Chemical Engineering, Sichuan University, Chengdu 610065, ChinaSichuan Coal Industry Group Limited Liability Company, Chengdu 610091, ChinaSichuan Coal Industry Group Limited Liability Company, Chengdu 610091, ChinaSichuan Coal Industry Group Limited Liability Company, Chengdu 610091, ChinaCollege of Chemical Engineering, Sichuan University, Chengdu 610065, ChinaThe 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.https://www.mdpi.com/2075-4701/15/4/380MOFoxygen vacancybifunctional catalysislight olefins |
| spellingShingle | Rundong Cai Heping Zheng Hong Liang Xiankun Chen Jianhua Tang Catalytic Properties of ZnZrO<sub>x</sub> Obtained via Metal–Organic Framework Precursors for CO<sub>2</sub> Hydrogenation to Prepare Light Olefins Metals MOF oxygen vacancy bifunctional catalysis light olefins |
| title | Catalytic Properties of ZnZrO<sub>x</sub> Obtained via Metal–Organic Framework Precursors for CO<sub>2</sub> Hydrogenation to Prepare Light Olefins |
| title_full | Catalytic Properties of ZnZrO<sub>x</sub> Obtained via Metal–Organic Framework Precursors for CO<sub>2</sub> Hydrogenation to Prepare Light Olefins |
| title_fullStr | Catalytic Properties of ZnZrO<sub>x</sub> Obtained via Metal–Organic Framework Precursors for CO<sub>2</sub> Hydrogenation to Prepare Light Olefins |
| title_full_unstemmed | Catalytic Properties of ZnZrO<sub>x</sub> Obtained via Metal–Organic Framework Precursors for CO<sub>2</sub> Hydrogenation to Prepare Light Olefins |
| title_short | Catalytic Properties of ZnZrO<sub>x</sub> Obtained via Metal–Organic Framework Precursors for CO<sub>2</sub> Hydrogenation to Prepare Light Olefins |
| title_sort | catalytic properties of znzro sub x sub obtained via metal organic framework precursors for co sub 2 sub hydrogenation to prepare light olefins |
| topic | MOF oxygen vacancy bifunctional catalysis light olefins |
| url | https://www.mdpi.com/2075-4701/15/4/380 |
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