Durability of CaO–CaZrO3 Sorbents for High-Temperature CO2 Capture Prepared by a Wet Chemical Method

Powders of CaO sorbent modified with CaZrO3 have been synthesized by a wet chemical route. For carbonation and calcination conditions relevant to sorbent-enhanced steam reforming applications, a powder of composition 10 wt % CaZrO3/90 wt % CaO showed an initial rise in CO2 uptake capacity in the fir...

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Published inEnergy & fuels Vol. 28; no. 2; pp. 1275 - 1283
Main Authors Zhao, Ming, Bilton, Matthew, Brown, Andy P, Cunliffe, Adrian M, Dvininov, Emiliana, Dupont, Valerie, Comyn, Tim P, Milne, Steven J
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 20.02.2014
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Abstract Powders of CaO sorbent modified with CaZrO3 have been synthesized by a wet chemical route. For carbonation and calcination conditions relevant to sorbent-enhanced steam reforming applications, a powder of composition 10 wt % CaZrO3/90 wt % CaO showed an initial rise in CO2 uptake capacity in the first 10 carbonation–decarbonation cycles, increasing from 0.31 g of CO2/g of sorbent in cycle 1 to 0.37 g of CO2/g of sorbent in cycle 10 and stabilizing at this value for the remainder of the 30 cycles tested, with carbonation at 650 °C in 15% CO2 and calcination at 800 °C in air. Under more severe conditions of calcination at 950 °C in 100% CO2, following carbonation at 650 °C in 100% CO2, the best overall performance was for a sorbent with 30 wt % CaZrO3/70 wt % CaO (the highest Zr ratio studied), with an initial uptake of 0.36 g of CO2/g of sorbent, decreasing to 0.31 g of CO2/g of sorbent at the 30th cycle. Electron microscopy revealed that CaZrO3 was present in the form of ≤0.5 μm cuboid and 20–80 nm particles dispersed within a porous matrix of CaO/CaCO3; the nanoparticles are considered to be the principal reason for promoting multicycle durability.
AbstractList Powders of CaO sorbent modified with CaZrO3 have been synthesized by a wet chemical route. For carbonation and calcination conditions relevant to sorbent-enhanced steam reforming applications, a powder of composition 10 wt % CaZrO3/90 wt % CaO showed an initial rise in CO2 uptake capacity in the first 10 carbonation–decarbonation cycles, increasing from 0.31 g of CO2/g of sorbent in cycle 1 to 0.37 g of CO2/g of sorbent in cycle 10 and stabilizing at this value for the remainder of the 30 cycles tested, with carbonation at 650 °C in 15% CO2 and calcination at 800 °C in air. Under more severe conditions of calcination at 950 °C in 100% CO2, following carbonation at 650 °C in 100% CO2, the best overall performance was for a sorbent with 30 wt % CaZrO3/70 wt % CaO (the highest Zr ratio studied), with an initial uptake of 0.36 g of CO2/g of sorbent, decreasing to 0.31 g of CO2/g of sorbent at the 30th cycle. Electron microscopy revealed that CaZrO3 was present in the form of ≤0.5 μm cuboid and 20–80 nm particles dispersed within a porous matrix of CaO/CaCO3; the nanoparticles are considered to be the principal reason for promoting multicycle durability.
Author Cunliffe, Adrian M
Dupont, Valerie
Zhao, Ming
Milne, Steven J
Brown, Andy P
Bilton, Matthew
Comyn, Tim P
Dvininov, Emiliana
AuthorAffiliation University of Leeds
Energy Research Institute, School of Process, Environmental and Materials Engineering (SPEME)
MEL Chemicals
Institute for Materials Research, School of Process, Environmental and Materials Engineering (SPEME)
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Keywords CO2 sequestration
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SubjectTerms Applied sciences
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fuels
Title Durability of CaO–CaZrO3 Sorbents for High-Temperature CO2 Capture Prepared by a Wet Chemical Method
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