Carbon Dioxide Capture from Flue Gas Using Tri-Sodium Phosphate as an Effective Sorbent

Sakpal Sakpal,Aman Aman,Kumar Kumar

doi:10.3390/en12152889

Sakpal Sakpal, Aman Aman + Show 1 more

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https://doi.org/10.3390/en12152889

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Journal: Energies	Publication Date: Jul 26, 2019
Citations: 7	License type: CC BY 4.0

Affiliation: University of Twente, University of Western Australia

Abstract

Fossil fuels are dominant as an energy source, typically producing carbon dioxide (CO2) and enhancing global climate change. The present work reports the application of low-cost tri-sodium phosphate (TSP) to capture CO2 from model flue gas (CO2 + N2) mixture, in a batch mode and fixed-bed setup. It is observed that TSP has a high CO2 capture capacity as well as high CO2 selectivity. At ambient temperature, TSP shows a maximum CO2 capture capacity of 198 mg CO2/g of TSP. Furthermore, the CO2 capture efficiency of TSP over a flue gas mixture was found to be more than 90%. Fresh and spent materials were characterized using powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), and Fourier transformed infrared spectroscopy (FTIR). Preliminary experiments were also conducted to evaluate the performance of regenerated TSP. The spent TSP was regenerated using sodium hydroxide (NaOH) and its recyclability was tested for three consecutive cycles. A conceptual prototype for post-combustion CO2 capture based on TSP material has also been discussed.

Highlights

Coal-fired thermal power stations contribute immensely to the anthropogenic release of carbon dioxide (CO2 ) in the atmosphere
The objective of the present work is to study the kinetics of CO2 capture and separation efficiency of carbon dioxide from flue gas mixture using solid tri-sodium phosphate (TSP) as a sorbent
Regenerated-TSP shows a similar spectrum as fresh TSP, with one additional peak at 866 cm−1, which is a characteristic band for C–O stretching in the carbonate ions (CO3 2− )

Summary

Introduction

Coal-fired thermal power stations contribute immensely to the anthropogenic release of carbon dioxide (CO2 ) in the atmosphere. CO2 is considered to be the major greenhouse gas, potentially contributing to global climate change [1,2,3,4]. According to a report of the Intergovernmental Panel on Climate Change, the projected carbon emissions from the energy sector will be twice as high by [5]. In the year 2013, the recorded global carbon dioxide emission from burning fossil fuels was 36 billion metric tons (39.7 billion tons) [6]. Storage, and utilization (CCSU) is an emerging potential technology to address this issue [7].

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