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Selective transformation of carbon dioxide into lower olefins with a bifunctional catalyst composed of ZnGa2O4 and SAPO-34

Time: 2017-12-17 | Updated: Print

Article link: Chem. Commum. 2018, 54, 140-143.

The transformation of CO2 into lower olefins is an attractive reaction for efficient utilization of CO2 as a renewable feedstock for synthesis of key building-block chemicals. Despite tremendous efforts based on modified Fischer-Tropsch synthesis catalysts, the selectivity of lower olefins from CO2 is typically lower than 60%. In this article, we report a bifunctional catalyst composed of ZnGa2O4 with spinel structure and molecular sieve SAPO-34, which successfully bridges the conversions of CO2 to methanol and methanol to olefins. The selectivity of lower olefins reaches 86% with a CO2 conversion of 13% at 370 ºC. We have demonstrated that the oxygen vacancy sites on ZnGa2O4 surfaces function for the activation and conversion of CO2 into methanol/dimethyl ether, which are subsequently converted to lower olefins by SAPO-34. The coupling of CO2-to-methanol with methanol-to-olefin not only drives the conversion of CO2 but also suppresses the undesirable reversed water-gas-shift reaction. We have demonstrated that the reaction coupling is a promising methodology not only for selectivity control in converting syngas into hydrocarbon fuels, lower olefins and aromatics, but also for CO2 conversion.

This work was mainly performed  by Liu Xiaoliang and Wang Mengheng. The Cover image was invited by the Editor because of the very positive comments from the reviewers and the high evaluation of the Editorial office. Zhou Cheng designed the graphical abstract and cover. This work was supported by Shell Global Solutions International B.V., the National Key Research and Development Program of the Ministry of Science and Technology (No. 2017YFB0602201), and the National Natural Science Foundation of China (No. 91545203, 21673188, 21503174, 21433008 and 21403177).

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