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Thermochemical splitting of carbon dioxide to carbon-containing fuels or value-added chemicals is a promising method to reduce greenhouse effects. In this study, we propose a novel process for synchronous promotion of chemical looping-based CO 2 splitting with biomass cascade utilization. The superiority of the process is reflected in (1) a biomass fast pyrolysis process is carried out for syngas, phenolic-rich bio-oil, and biochar co-production with oxygen carrier reduction; (2) the reduced oxygen carrier and the biomass-derived biochar were both applied for CO 2 splitting during the oxygen carrier oxidation stage with carbon monoxide production as well as oxygen carrier re-oxidation; (3) the redox looping of the oxygen carrier was found to synchronously promote the comprehensive utilization of biomass and CO 2 splitting to CO. Various characterizations e.g. HRTEM- and SEM-EDX mapping, H 2 -TPR, CO 2 -TPO, XRD, XPS, N 2 nitrogen adsorption and desorption isotherm tests, Mössbauer, etc. were employed to elucidate the aerogels' microstructures, phase compositions, redox activity, and cyclic stability. Results indicate that the Ca 2 Fe 2 O 5 aerogel is a promising initiator of the proposed chemical looping process from the perspectives of biomass utilization efficiency, redox activity, and cyclic durability. 

Abstract Implementing Paris Climate Accord is inhibited by the high energy consumption of the state-of-the-art CO₂capture technologies due to the notoriously slow kinetics in CO₂desorption step of CO₂capture. To address the challenge, here we report that nanostructured TiO(OH)₂as a catalyst is capable of drastically increasing the rates of CO₂desorption from spent monoethanolamine (MEA) by over 4500%. This discovery makes CO₂capture successful at much lower temperatures, which not only dramatically reduces energy consumption but also amine losses and prevents emission of carcinogenic amine-decomposition byproducts. The catalytic effect of TiO(OH)₂is observed with Raman characterization. The stabilities of the catalyst and MEA are confirmed with 50 cyclic CO₂sorption and sorption. A possible mechanism is proposed for the TiO(OH)₂-catalyzed CO₂capture. TiO(OH)₂could be a key to the future success of Paris Climat e Accord.