Abstract
Chemical looping combustion (CLC) processes have been shown to be promising and effective in reducing CO2 production from the combustion of various fuels associated with the growing global demand for energy, as it promotes indirect fuel combustion through solid oxygen carriers (SOC). Thus, this study aims to synthesize, characterize and evaluate mixed copper and titanium oxide as a solid oxygen carrier for use in combustion processes with chemical looping. The SOC was synthesized based on stoichiometric calculations by the polymeric precursor method and characterized by: X-ray fluorescence (XRF), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM-FEG) with EDS, and Programmed Temperature Reduction (PTR). The oxygen carrying capacity (ROC) and the speed index of the reduction and oxidation cycles were evaluated by Thermogravimetric Reactivity (TGA). The main reactive phase identified was: The CuO phase for the mixed copper and titanium oxide were identified and confirmed by X-ray diffraction using the Rietveld refinement method. The reactivity of the CuO-TiO2 system was high, obtaining a CH4 conversion rate above 90% and a speed index of 40%/min. Due to the structural characteristics and the reactivity tests of this material, it is concluded that mixed copper and titanium oxide have the necessary requirements to be used in chemical looping combustion (CLC) processes.
Highlights
Climate change has caused significant impacts on natural and human systems on all continents and across the oceans in recent decades, and a large part of these changes are caused by one of the environmental issues that most concern humanity: the intensification of global warming
2018b), the reduction and oxidation rate in chemical looping combustion (CLC) processes must be sufficiently fast, which was observed in the thermogravimetric experiments for the TCu solid oxygen carrier shown in Figure 3, as its total oxidation occurred in less than 1 minute
The TCu solid oxygen carrier showed better reactivity than the copper oxide carriers supported on diatomite (Cu-D) and kaolin particles (Cu-K) (Costa et al, 2021), making this material very promising for its application in chemical looping combustion (CLC) processes
Summary
Climate change has caused significant impacts on natural and human systems on all continents and across the oceans in recent decades, and a large part of these changes are caused by one of the environmental issues that most concern humanity: the intensification of global warming. Due to the increase in CO2 emissions, the new IPCC report (2021) states that the global temperature temporarily exceeds or surpasses 1.5°C and no longer 2°C as described at COP21 in 2015 (International Energy Agency, 2019; IPCC, 2018; Page et al, n.d.). Due to the huge dependence on the use of fossil fuels in generating energy, CO2 Capture and Storage (CCS) technologies have emerged as an important option to reduce global CO2 emissions. In order to achieve this goal, Chemical Looping Combustion (CLC) has emerged as a promising technology for CO2 capture in power plants and industrial applications, with low energy penalties compared to other competing CO2 Capture and Storage (CCS) techniques (Juan Adánez & Abad, 2019).
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
