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TiO(OH)₂ - highly effective catalysts for optimizing CO₂ desorption kinetics reducing CO₂ capture cost: A new pathway.

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.

SUBMITTER: Yao H

PROVIDER: S-EPMC5462786 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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TiO(OH)2 - highly effective catalysts for optimizing CO2 desorption kinetics reducing CO2 capture cost: A new pathway.

Yao Hongbao H Toan Sam S Huang Liang L Fan Maohong M Wang Yujun Y Russell Armistead G AG Luo Guangsheng G Fei Weiyang W

Scientific reports 20170607 1

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 perspecti ...[more]

PMID: 28592867

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Project description:An excessive amount of CO2 is the leading cause of climate change, and hence, its reduction in the Earth's atmosphere is critical to stop further degradation of the environment. Although a large body of work has been carried out for post-combustion low-temperature CO2 capture, there are very few high temperature pre-combustion CO2 capture processes. Lithium silicate (Li4SiO4), one of the best known high-temperature CO2 capture sorbents, has two main challenges, moderate capture kinetics and poor sorbent stability. In this work, we have designed and synthesized lithium silicate nanosheets (LSNs), which showed high CO2 capture capacity (35.3 wt% CO2 capture using 60% CO2 feed gas, close to the theoretical value) with ultra-fast kinetics and enhanced stability at 650 °C. Due to the nanosheet morphology of the LSNs, they provided a good external surface for CO2 adsorption at every Li-site, yielding excellent CO2 capture capacity. The nanosheet morphology of the LSNs allowed efficient CO2 diffusion to ensure reaction with the entire sheet as well as providing extremely fast CO2 capture kinetics (0.22 g g-1 min-1). Conventional lithium silicates are known to rapidly lose their capture capacity and kinetics within the first few cycles due to thick carbonate shell formation and also due to the sintering of sorbent particles; however, the LSNs were stable for at least 200 cycles without any loss in their capture capacity or kinetics. The LSNs neither formed a carbonate shell nor underwent sintering, allowing efficient adsorption-desorption cycling. We also proposed a new mechanism, a mixed-phase model, to explain the unique CO2 capture behavior of the LSNs, using detailed (i) kinetics experiments for both adsorption and desorption steps, (ii) in situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy measurements, (iii) depth-profiling X-ray photoelectron spectroscopy (XPS) of the sorbent after CO2 capture and (iv) theoretical investigation through systematic electronic structure calculations within the framework of density functional theory (DFT) formalism.

Dataset Information

TiO(OH)₂ - highly effective catalysts for optimizing CO₂ desorption kinetics reducing CO₂ capture cost: A new pathway.

Publications

TiO(OH)<sub>2</sub> - highly effective catalysts for optimizing CO<sub>2</sub> desorption kinetics reducing CO<sub>2</sub> capture cost: A new pathway.

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