Abstract
The objective is to find a new pathway for significant reduction in CO2 capture energy consumption. Specifically, nanoporous TiO(OH)2 was used to realize the objective, which was desired as a catalyst to significantly accelerate the decomposition of aqueous NaHCO3, essentially CO2 desorption – the key step of Na2CO3/NaHCO3 based CO2 capture technologies from overall CO2 energy consumption perspective. Effects of several important factors on TiO(OH)2-catalyzed NaHCO3 decomposition were investigated. The quantity of CO2 generated from 0.238 mol/L NaHCO3 at 65 °C with catalyst is ~800% of that generated without the presence of catalyst. When a 12 W vacuum pump was used for carrying the generated CO2 out of reactor, the total amount of CO2 released was improved by ~2,500% under the given experimental conditions. No significant decrease in the catalytic effect of TiO(OH)2 was observed after five cyclic CO2 activated tests. In addition, characterizations with in-situ Fourier transform infrared spectroscopy, thermal gravity analysis and Brunauer-Emmett-Teller of TiO(OH)2 indicate that TiO(OH)2 is quite stable. The discovery in this research could inspire scientists’ interests in starting to focus on a new pathway instead of making huge effort or investment in designing high-capacity but expensive CO2 sorbent for developing practical or cost-effective CO2 technologies.
Highlights
The objective is to find a new pathway for significant reduction in CO2 capture energy consumption
The importance of CO2 capture in fossil fuel-fired power plants cannot be underestimated any more due to the catastrophic effect of the continuous increase in CO2 concentration in atmosphere and the ill effects it has on the environment[3,4,5], as indicated in the recently reached Paris Agreement[6]
The energy consumption needed for CO2 desorption or spent sorbent regeneration accounts for ~15–30% of power plants’ electricity outputs[11]
Summary
The objective is to find a new pathway for significant reduction in CO2 capture energy consumption. Nanoporous TiO(OH)[2] was used to realize the objective, which was desired as a catalyst to significantly accelerate the decomposition of aqueous NaHCO3, essentially CO2 desorption – the key step of Na2CO3/NaHCO3 based CO2 capture technologies from overall CO2 energy consumption perspective. The importance of CO2 capture in fossil fuel-fired power plants cannot be underestimated any more due to the catastrophic effect of the continuous increase in CO2 concentration in atmosphere and the ill effects it has on the environment[3,4,5], as indicated in the recently reached Paris Agreement[6]. The energy consumption needed for CO2 desorption or spent sorbent regeneration accounts for ~15–30% of power plants’ electricity outputs[11]. The efforts made in promoting CO2 desorption or spent sorbent regeneration are still much less than that improving CO2 absorption
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