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The grain growth mechanism of nano-CaO regenerated by nano-CaCO(3) in calcium looping

The grain growth mechanism of nano-CaO-based CO(2) adsorbents in calcium looping (CaL) process was studied to figure out the main factors affecting sorption durability. First, the thermal growth characteristics of nano-CaCO(3) grains and nano-CaO grains at 750–850 °C was measured to fit the grain gr...

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Autores principales: Liu, Hao, Pan, Fanfeng, Wu, Sufang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9070547/
https://www.ncbi.nlm.nih.gov/pubmed/35528570
http://dx.doi.org/10.1039/c9ra03611c
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author Liu, Hao
Pan, Fanfeng
Wu, Sufang
author_facet Liu, Hao
Pan, Fanfeng
Wu, Sufang
author_sort Liu, Hao
collection PubMed
description The grain growth mechanism of nano-CaO-based CO(2) adsorbents in calcium looping (CaL) process was studied to figure out the main factors affecting sorption durability. First, the thermal growth characteristics of nano-CaCO(3) grains and nano-CaO grains at 750–850 °C was measured to fit the grain growth kinetic models. The activation energy data of grain growth of nano-CaCO(3) and nano-CaO were obtained as 104.8 kJ mol(−1) and 212.8 kJ mol(−1) respectively, which indicated that the grain growth of nano-CaCO(3) was easier than that of nano-CaO. Then, the grain sizes of regenerated nano-CaO undergoing 10 CaL cycles were compared with those derived from nano-CaCO(3) suffering high temperature heat-treatment under the same looping temperature and time. It was found that CaCO(3)–CaO chemical conversion could accelerate the grain growth of regenerated nano-CaO. Based on these results, the grain growth mechanism of regenerated nano-CaO grain in CaL process was proposed. The thermal growth of nano-CaCO(3) grain was the key issue to influence the grain growth of regenerated nano-CaO. Therefore, shortening the high temperature residence time as well as preventing the interface contact of nano-CaCO(3) grains were good for limiting the grain growth of regenerated nano-CaO.
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spelling pubmed-90705472022-05-05 The grain growth mechanism of nano-CaO regenerated by nano-CaCO(3) in calcium looping Liu, Hao Pan, Fanfeng Wu, Sufang RSC Adv Chemistry The grain growth mechanism of nano-CaO-based CO(2) adsorbents in calcium looping (CaL) process was studied to figure out the main factors affecting sorption durability. First, the thermal growth characteristics of nano-CaCO(3) grains and nano-CaO grains at 750–850 °C was measured to fit the grain growth kinetic models. The activation energy data of grain growth of nano-CaCO(3) and nano-CaO were obtained as 104.8 kJ mol(−1) and 212.8 kJ mol(−1) respectively, which indicated that the grain growth of nano-CaCO(3) was easier than that of nano-CaO. Then, the grain sizes of regenerated nano-CaO undergoing 10 CaL cycles were compared with those derived from nano-CaCO(3) suffering high temperature heat-treatment under the same looping temperature and time. It was found that CaCO(3)–CaO chemical conversion could accelerate the grain growth of regenerated nano-CaO. Based on these results, the grain growth mechanism of regenerated nano-CaO grain in CaL process was proposed. The thermal growth of nano-CaCO(3) grain was the key issue to influence the grain growth of regenerated nano-CaO. Therefore, shortening the high temperature residence time as well as preventing the interface contact of nano-CaCO(3) grains were good for limiting the grain growth of regenerated nano-CaO. The Royal Society of Chemistry 2019-08-28 /pmc/articles/PMC9070547/ /pubmed/35528570 http://dx.doi.org/10.1039/c9ra03611c Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Liu, Hao
Pan, Fanfeng
Wu, Sufang
The grain growth mechanism of nano-CaO regenerated by nano-CaCO(3) in calcium looping
title The grain growth mechanism of nano-CaO regenerated by nano-CaCO(3) in calcium looping
title_full The grain growth mechanism of nano-CaO regenerated by nano-CaCO(3) in calcium looping
title_fullStr The grain growth mechanism of nano-CaO regenerated by nano-CaCO(3) in calcium looping
title_full_unstemmed The grain growth mechanism of nano-CaO regenerated by nano-CaCO(3) in calcium looping
title_short The grain growth mechanism of nano-CaO regenerated by nano-CaCO(3) in calcium looping
title_sort grain growth mechanism of nano-cao regenerated by nano-caco(3) in calcium looping
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9070547/
https://www.ncbi.nlm.nih.gov/pubmed/35528570
http://dx.doi.org/10.1039/c9ra03611c
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