Dehydration of Isopropanol over Silica-Supported Heteropoly Acids
Dehydration of i-PrOH is used in academic research as a test reaction to probe the acid properties of solid acid catalysts. Also, it has practical importance for the utilization of surplus acetone produced by the Hock process for the combined manufacturing of phenol and acetone as well as for the pr...
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MDPI AG
2024-01-01
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| Online Access: | https://www.mdpi.com/2073-4344/14/1/51 |
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| author | Amal Alasmari Elena F. Kozhevnikova Ivan V. Kozhevnikov |
| author_facet | Amal Alasmari Elena F. Kozhevnikova Ivan V. Kozhevnikov |
| author_sort | Amal Alasmari |
| collection | DOAJ |
| description | Dehydration of i-PrOH is used in academic research as a test reaction to probe the acid properties of solid acid catalysts. Also, it has practical importance for the utilization of surplus acetone produced by the Hock process for the combined manufacturing of phenol and acetone as well as for the production of propene from renewable resources and waste. This study demonstrates the excellent performance of polyoxometalate acid catalysts comprising silica-supported Keggin-type heteropoly acids H<sub>3</sub>PW<sub>12</sub>O<sub>40</sub> and H<sub>4</sub>SiW<sub>12</sub>O<sub>40</sub> for gas-phase i-PrOH-to-propene dehydration at ambient pressure. These catalysts show similar efficacies, giving an i-PrOH conversion and propene selectivity of 96.8 and 99.7% for 25%HPW/SiO<sub>2</sub> and 97.1 and 99.4% for 25%HSiW/SiO<sub>2</sub> in a fixed-bed reactor at 120 °C, a relevant-to-practice i-PrOH partial pressure of 15 kPa and a contact time <i>W/F</i> = 27 g h mol<sup>−1</sup> (GHSV = 900 mL g<sup>−1</sup> h<sup>−1</sup>). The catalysts are stable, resisting deactivation for at least 24 h time on stream. The HPA/SiO<sub>2</sub> catalysts are superior to aluminosilicate zeolites such as H-mordenite, HZSM-5 and HY for i-PrOH-to-propene dehydration in terms of i-PrOH conversion, propene selectivity and catalyst stability. |
| first_indexed | 2024-03-08T11:02:38Z |
| format | Article |
| id | doaj.art-d6d959865ca64495a62cacf68a22a90d |
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| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-08T11:02:38Z |
| publishDate | 2024-01-01 |
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| spelling | doaj.art-d6d959865ca64495a62cacf68a22a90d2024-01-26T15:40:30ZengMDPI AGCatalysts2073-43442024-01-011415110.3390/catal14010051Dehydration of Isopropanol over Silica-Supported Heteropoly AcidsAmal Alasmari0Elena F. Kozhevnikova1Ivan V. Kozhevnikov2Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UKDepartment of Chemistry, University of Liverpool, Liverpool L69 7ZD, UKDepartment of Chemistry, University of Liverpool, Liverpool L69 7ZD, UKDehydration of i-PrOH is used in academic research as a test reaction to probe the acid properties of solid acid catalysts. Also, it has practical importance for the utilization of surplus acetone produced by the Hock process for the combined manufacturing of phenol and acetone as well as for the production of propene from renewable resources and waste. This study demonstrates the excellent performance of polyoxometalate acid catalysts comprising silica-supported Keggin-type heteropoly acids H<sub>3</sub>PW<sub>12</sub>O<sub>40</sub> and H<sub>4</sub>SiW<sub>12</sub>O<sub>40</sub> for gas-phase i-PrOH-to-propene dehydration at ambient pressure. These catalysts show similar efficacies, giving an i-PrOH conversion and propene selectivity of 96.8 and 99.7% for 25%HPW/SiO<sub>2</sub> and 97.1 and 99.4% for 25%HSiW/SiO<sub>2</sub> in a fixed-bed reactor at 120 °C, a relevant-to-practice i-PrOH partial pressure of 15 kPa and a contact time <i>W/F</i> = 27 g h mol<sup>−1</sup> (GHSV = 900 mL g<sup>−1</sup> h<sup>−1</sup>). The catalysts are stable, resisting deactivation for at least 24 h time on stream. The HPA/SiO<sub>2</sub> catalysts are superior to aluminosilicate zeolites such as H-mordenite, HZSM-5 and HY for i-PrOH-to-propene dehydration in terms of i-PrOH conversion, propene selectivity and catalyst stability.https://www.mdpi.com/2073-4344/14/1/51isopropanoldehydrationpropenepolyoxometalateheteropoly acidzeolite |
| spellingShingle | Amal Alasmari Elena F. Kozhevnikova Ivan V. Kozhevnikov Dehydration of Isopropanol over Silica-Supported Heteropoly Acids Catalysts isopropanol dehydration propene polyoxometalate heteropoly acid zeolite |
| title | Dehydration of Isopropanol over Silica-Supported Heteropoly Acids |
| title_full | Dehydration of Isopropanol over Silica-Supported Heteropoly Acids |
| title_fullStr | Dehydration of Isopropanol over Silica-Supported Heteropoly Acids |
| title_full_unstemmed | Dehydration of Isopropanol over Silica-Supported Heteropoly Acids |
| title_short | Dehydration of Isopropanol over Silica-Supported Heteropoly Acids |
| title_sort | dehydration of isopropanol over silica supported heteropoly acids |
| topic | isopropanol dehydration propene polyoxometalate heteropoly acid zeolite |
| url | https://www.mdpi.com/2073-4344/14/1/51 |
| work_keys_str_mv | AT amalalasmari dehydrationofisopropanoloversilicasupportedheteropolyacids AT elenafkozhevnikova dehydrationofisopropanoloversilicasupportedheteropolyacids AT ivanvkozhevnikov dehydrationofisopropanoloversilicasupportedheteropolyacids |