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Text from PDF Page: 001Edited by: Hitoshi Ishida, Kitasato University, Japan Reviewed by: Salah S. Massoud, University of Louisiana at Lafayette, United States Marc Robert, Paris Diderot University, France Jinquan Wang, Institute of Bioengineering and Nanotechnology (A∗STAR), Singapore *Correspondence: Hong-Ru Li email@example.com Liang-Nian He firstname.lastname@example.org Specialty section: This article was submitted to Inorganic Chemistry, a section of the journal Frontiers in Chemistry Received: 11 January 2019 Accepted: 09 July 2019 Published: 24 July 2019 Citation: Fu H-C, You F, Li H-R and He L-N (2019) CO2 Capture and in situ Catalytic Transformation. Front. Chem. 7:525. doi: 10.3389/fchem.2019.00525 REVIEW published: 24 July 2019 doi: 10.3389/fchem.2019.00525 CO2 Capture and in situ Catalytic Transformation Hong-Chen Fu1,2, Fei You2, Hong-Ru Li1,2* and Liang-Nian He2* 1 College of Pharmacy, Nankai University, Tianjin, China, 2 State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, China The escalating rate of fossil fuel combustion contributes to excessive CO2 emission and the resulting global climate change has drawn considerable attention. Therefore, tremendous efforts have been devoted to mitigate the CO2 accumulation in the atmosphere. Carbon capture and storage (CCS) strategy has been regarded as one of the promising options for controlling CO2 build-up. However, desorption and compression of CO2 need extra energy input. To circumvent this energy issue, carbon capture and utilization (CCU) strategy has been proposed whereby CO2 can be captured and in situ activated simultaneously to participate in the subsequent conversion under mild conditions, offering valuable compounds. As an alternative to CCS, the CCU has attracted much concern. Although various absorbents have been developed for the CCU strategy, the direct, in situ chemical conversion of the captured CO2 into valuable chemicals remains in its infancies compared with the gaseous CO2 conversion. This review summarizes the recent progress on CO2 capture and in situ catalytic transformation. The contents are introduced according to the absorbent types, in which different reaction type is involved and the transformation mechanism of the captured CO2 and the role of the absorbent in the conversion are especially elucidated. We hope this review can shed light on the transformation of the captured CO2 and arouse broad concern on the CCU strategy. Keywords: CO2 capture, activation, conversion, in situ catalysis, green chemistry INTRODUCTION The demand for energy of the rapid industrialization results in large-scale combustion of fossil fuel, which causes excessive emissions of carbon dioxide. As the detrimental environmental impacts of CO2 have drawn considerable attention, various strategies have been developed to mitigate CO2 accumulation in the atmosphere, among which carbon capture and storage/sequestration (CCS) is considered as a promising CO2 reducing option (Alexander et al., 2015). Nowadays, a plethora of CO2 absorbents have been developed to facilitate CO2 capture and desorption. Nevertheless, the extensive energy needed in the absorbent regeneration and CO2 separation is not conducive to the implementation of CCS strategy. In contrast to carbon sequestration, converting CO2 into valuable chemicals could be a sustainable option, which has been proposed by Ciamician as early as 1912 (Ciamician, 1912). In recent decades, CO2 conversion has attracted considerable concern and been intensively investigated (Rahman et al., 2017). However, in most processes for CO2 conversion, pure or high pressure CO2 is needed, implying that the CO2 from the atmosphere or industrial exhaust cannot be used as C1 source directly and thus the energy issue in CO2 capture and separation still remains. Frontiers in Chemistry | www.frontiersin.org 1 July 2019 | Volume 7 | Article 525
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