New catalysts for carboxylation of propylene glycol to propylene carbonate via high-throughput screening

José A. Castro-Osma; James W. Comerford; Richard H. Heyn; Michael North; Elisabeth Tangstad

doi:10.1039/c5fd00061k

New catalysts for carboxylation of propylene glycol to propylene carbonate via high-throughput screening

José A. Castro-Osma, James W. Comerford, Richard H. Heyn^*, Michael North, Elisabeth Tangstad

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

High throughput methodologies screened 81 different metal salts and metal salt combinations as catalysts for the carboxylation of propylene glycol to propylene carbonate, as compared to a 5 mol% Zn(OAc)₂/p-chlorobenzene sulfonic acid benchmark catalyst. The reactions were run with added acetonitrile (MeCN) as a chemical water trap. Two new catalysts were thereby discovered, zinc trifluoromethanesulfonate (Zn(OTf)₂) and zinc p-toluenesulfonate. The optimal reaction parameters for the former catalyst were screened. Zn(OTf)₂ gave an overall propylene carbonate yield of greater than 50% in 24 h, twice as large as the previous best literature yield with MeCN as a water trap, with 69% selectivity and 75% conversion of propylene glycol at 145 °C and 50 bar CO₂ pressure.

Original language	English
Pages (from-to)	19-30
Number of pages	12
Journal	FARADAY DISCUSSIONS
Volume	183
DOIs	https://doi.org/10.1039/c5fd00061k
Publication status	Published - 23 Sept 2015

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abstract = "High throughput methodologies screened 81 different metal salts and metal salt combinations as catalysts for the carboxylation of propylene glycol to propylene carbonate, as compared to a 5 mol% Zn(OAc)2/p-chlorobenzene sulfonic acid benchmark catalyst. The reactions were run with added acetonitrile (MeCN) as a chemical water trap. Two new catalysts were thereby discovered, zinc trifluoromethanesulfonate (Zn(OTf)2) and zinc p-toluenesulfonate. The optimal reaction parameters for the former catalyst were screened. Zn(OTf)2 gave an overall propylene carbonate yield of greater than 50% in 24 h, twice as large as the previous best literature yield with MeCN as a water trap, with 69% selectivity and 75% conversion of propylene glycol at 145 °C and 50 bar CO2 pressure.",

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AU - Castro-Osma, José A.

AU - Comerford, James W.

AU - Heyn, Richard H.

AU - North, Michael

AU - Tangstad, Elisabeth

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AB - High throughput methodologies screened 81 different metal salts and metal salt combinations as catalysts for the carboxylation of propylene glycol to propylene carbonate, as compared to a 5 mol% Zn(OAc)2/p-chlorobenzene sulfonic acid benchmark catalyst. The reactions were run with added acetonitrile (MeCN) as a chemical water trap. Two new catalysts were thereby discovered, zinc trifluoromethanesulfonate (Zn(OTf)2) and zinc p-toluenesulfonate. The optimal reaction parameters for the former catalyst were screened. Zn(OTf)2 gave an overall propylene carbonate yield of greater than 50% in 24 h, twice as large as the previous best literature yield with MeCN as a water trap, with 69% selectivity and 75% conversion of propylene glycol at 145 °C and 50 bar CO2 pressure.

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New catalysts for carboxylation of propylene glycol to propylene carbonate via high-throughput screening

Abstract

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