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Title: Carbonation and hydration characteristics of dry potassium-based sorbents for CO{sub 2} capture

Abstract

Thermogravimetric apparatus (TGA) and X-ray diffraction (XRD) have been used to study the characteristics of potassium-based sorbents for CO{sub 2} capture. The carbonation reactivity of K{sub 2}CO{sub 3}.1.5H{sub 2}O and K{sub 2}CO{sub 3} dehydrated from K{sub 2}CO{sub 3}. 1.5H{sub 2}O was weak. However, K{sub 2}CO{sub 3} calcined from KHCO{sub 3} showed excellent carbonation capacity and no deactivation of sorbents during multiple cycles. The XRD results showed that the sample dehydrated from K{sub 2}CO{sub 3}1.5H{sub 2}O was K{sub 2}CO{sub 3} with structure of monoclinic crystal (PCNo.1). The carbonation products of PCNo.1 included K{sub 2}CO{sub 3}.1.5H{sub 2}O and KHCO{sub 3}, and K{sub 2}CO{sub 3}. 1.5H{sub 2}O was the main product. Correspondingly, K{sub 2}CO{sub 3} with structure of hexagonal crystal (PCNo.2) was the product calcined from KHCO{sub 3}, and the main carbonation product of PCNo.2 was KHCO{sub 3}. The byproduct of K{sub 4}H{sub 2}(CO{sub 3})3.1.5H{sub 2}O for PCNo.2 would affect the carbonation processes. Hydration tests confirmed the two hypotheses: the hydration reaction will first occur for K{sub 2}CO{sub 3} with structure of monoclinic crystal, and the carbonation reaction will first occur for K{sub 2}CO{sub 3} with structure of hexagonal crystal. The reaction principles were analyzed by product and the relevant reactions. This investigationmore » can be used as basic data for dry potassium-based sorbents capturing CO{sub 2} from flue gas. 20 refs., 7 figs.« less

Authors:
; ; ;  [1]
  1. Southeast University, Nanjing (China). Thermoenergy Engineering Research Institute
Publication Date:
OSTI Identifier:
21187104
Resource Type:
Journal Article
Journal Name:
Energy and Fuels
Additional Journal Information:
Journal Volume: 23; Journal Issue: 3; Journal ID: ISSN 0887-0624
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; POTASSIUM CARBONATES; HYDRATION; CARBON DIOXIDE; CAPTURE; ADSORBENTS; DEACTIVATION; FLUE GAS; X-RAY DIFFRACTION; THERMAL GRAVIMETRIC ANALYSIS

Citation Formats

Zhao, Chuanwen, Chen, Xiaoping, Zhao, Changsui, and Liu, Yakun. Carbonation and hydration characteristics of dry potassium-based sorbents for CO{sub 2} capture. United States: N. p., 2009. Web. doi:10.1021/ef800889m.
Zhao, Chuanwen, Chen, Xiaoping, Zhao, Changsui, & Liu, Yakun. Carbonation and hydration characteristics of dry potassium-based sorbents for CO{sub 2} capture. United States. https://doi.org/10.1021/ef800889m
Zhao, Chuanwen, Chen, Xiaoping, Zhao, Changsui, and Liu, Yakun. 2009. "Carbonation and hydration characteristics of dry potassium-based sorbents for CO{sub 2} capture". United States. https://doi.org/10.1021/ef800889m.
@article{osti_21187104,
title = {Carbonation and hydration characteristics of dry potassium-based sorbents for CO{sub 2} capture},
author = {Zhao, Chuanwen and Chen, Xiaoping and Zhao, Changsui and Liu, Yakun},
abstractNote = {Thermogravimetric apparatus (TGA) and X-ray diffraction (XRD) have been used to study the characteristics of potassium-based sorbents for CO{sub 2} capture. The carbonation reactivity of K{sub 2}CO{sub 3}.1.5H{sub 2}O and K{sub 2}CO{sub 3} dehydrated from K{sub 2}CO{sub 3}. 1.5H{sub 2}O was weak. However, K{sub 2}CO{sub 3} calcined from KHCO{sub 3} showed excellent carbonation capacity and no deactivation of sorbents during multiple cycles. The XRD results showed that the sample dehydrated from K{sub 2}CO{sub 3}1.5H{sub 2}O was K{sub 2}CO{sub 3} with structure of monoclinic crystal (PCNo.1). The carbonation products of PCNo.1 included K{sub 2}CO{sub 3}.1.5H{sub 2}O and KHCO{sub 3}, and K{sub 2}CO{sub 3}. 1.5H{sub 2}O was the main product. Correspondingly, K{sub 2}CO{sub 3} with structure of hexagonal crystal (PCNo.2) was the product calcined from KHCO{sub 3}, and the main carbonation product of PCNo.2 was KHCO{sub 3}. The byproduct of K{sub 4}H{sub 2}(CO{sub 3})3.1.5H{sub 2}O for PCNo.2 would affect the carbonation processes. Hydration tests confirmed the two hypotheses: the hydration reaction will first occur for K{sub 2}CO{sub 3} with structure of monoclinic crystal, and the carbonation reaction will first occur for K{sub 2}CO{sub 3} with structure of hexagonal crystal. The reaction principles were analyzed by product and the relevant reactions. This investigation can be used as basic data for dry potassium-based sorbents capturing CO{sub 2} from flue gas. 20 refs., 7 figs.},
doi = {10.1021/ef800889m},
url = {https://www.osti.gov/biblio/21187104}, journal = {Energy and Fuels},
issn = {0887-0624},
number = 3,
volume = 23,
place = {United States},
year = {Sun Mar 15 00:00:00 EDT 2009},
month = {Sun Mar 15 00:00:00 EDT 2009}
}