Synthesis of highly effective stabilized-CaO sorbents via a sacrificial N-doped carbon nanosheet template

Date published

2019-03-18

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Royal society of Chemistry

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Article

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2050-7488

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Wang K, Clough PT, Zhao P, Anthony, EJ. (2018) Synthesis of highly effective stabilized-CaO sorbents via a sacrificial N-doped carbon nanosheet template. Journal of Materials Chemistry A, Volume 7, Issue 15, April 2019, pp. 9173-9182

Abstract

Calcium looping, a promising high-temperature CO2 capture technique, offers a midterm economic solution to mitigate anthropogenic CO2 emissions. The main challenge for calcium looping is the synthesis of highly efficient CaO-based sorbents that can be used over many reaction cycles. Here, a sacrificial N-doped carbon nanosheet template was developed which produces MgO-stabilized, CaO sorbents with fast adsorption rates, high capacities and remarkable long term performance over many cycles. The characterization results show that such a template was formed through in situ pyrolysis of an organic acid and nitrates in a simple heating process under nitrogen. The presence of a carbonaceous template prevented crystallite growth, featured highly macroporous nanosheet (~60 nm thick) morphologies, ensured homogeneously mixing of Ca and Mg, which is essential to attain minimal diffusion limitations, mitigated sintering, and produced structural stabilization. Thus, 10 mol% MgO acting as an inert stabilizer was sufficient to achieve a CO2 uptake of 0.65 g/g (corresponding to a capacity retention of 89.9%) after 10 cycles in realistic conditions, as confirmed by TGA analyses. This N-doped carbon template can be applied generally to form a wide range of porous and nanostructured stabilized-CaO sorbents with stable CO2 uptakes.

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Github

Keywords

CO2 capture, N-doped carbon, Sacrificial template

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Attribution-NonCommercial 4.0 International

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