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Can CO 2 and Steam React in the Absence of Electrolysis at High Temperatures?
Author(s) -
Zhou Song,
Yan Xue,
Liu Cheng,
Qian Binbin,
Zhe Liu Jefferson,
Zhang Lian
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202002009
Subject(s) - electrolysis , chemistry , electrochemistry , chemical engineering , atmospheric pressure , high temperature electrolysis , carbon fibers , bicarbonate , dopant , inorganic chemistry , materials science , doping , electrode , organic chemistry , engineering , electrolyte , oceanography , optoelectronics , composite number , composite material , geology
The fundamental question of whether CO 2 can react with steam at high temperatures in the absence of electrolysis or high pressures is answered. These two gases are commonly co‐present as industrial wastes. Herein, a simple experiment by flowing CO 2 and steam through a CaCl 2 matrix at 500–1000 °C and atmospheric pressure was designed. Comprehensive characterizations and density functional theory calculations were conducted. Meanwhile, this study aims to recover HCl from CaCl 2 via a low‐emission oxy‐pyrohydrolysis process. As confirmed, CO 2 and steam interact strongly on the CaCl 2 surface, leading to an explicit formation of CaCO 3 /CaO and a nearly complete release of HCl. This is mainly contributed to a halved energy required for the splitting of H 2 O, resulting from the formation of a bicarbonate‐like structure to replace Cl − out of CaCl 2 , an otherwise industrial waste, whilst an important dopant for carbon capture, utilization and storage, and medium for electrochemical synthesis.