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

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• 作者：Ming Zhao ; Matthew Bilton ; Andy P. Brown ; Adrian M. Cunliffe ; Emiliana Dvininov ; Valerie Dupont ; Tim P. Comyn ; Steven J. Milne
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：February 20, 2014
• 年：2014
• 卷：28
• 期：2
• 页码：1275-1283
• 全文大小：517K
• ISSN：1520-5029

文摘

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鈥揹ecarbonation 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 掳C in 15% CO₂ and calcination at 800 掳C in air. Under more severe conditions of calcination at 950 掳C in 100% CO₂, following carbonation at 650 掳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 鈮?.5 渭m cuboid and 20鈥?0 nm particles dispersed within a porous matrix of CaO/CaCO₃; the nanoparticles are considered to be the principal reason for promoting multicycle durability.