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Alkali‐Doped Lithium Orthosilicate Sorbents for Carbon Dioxide Capture
Author(s) -
Yang Xinwei,
Liu Wenqiang,
Sun Jian,
Hu Yingchao,
Wang Wenyu,
Chen Hongqiang,
Zhang Yang,
Li Xian,
Xu Minghou
Publication year - 2016
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.201600737
Subject(s) - alkali metal , orthosilicate , lithium (medication) , eutectic system , doping , materials science , differential scanning calorimetry , tetraethyl orthosilicate , carbon dioxide , absorption (acoustics) , inorganic chemistry , chemical engineering , analytical chemistry (journal) , mineralogy , chemistry , nanotechnology , organic chemistry , composite material , microstructure , medicine , physics , optoelectronics , endocrinology , engineering , thermodynamics
New alkali‐doped (Na 2 CO 3 and K 2 CO 3 ) Li 4 SiO 4 sorbents with excellent performance at low CO 2 concentrations were synthesized. We speculate that alkali doping breaks the orderly arrangement of the Li 4 SiO 4 crystals, hence increasing its specific surface area and the number of pores. It was shown that 10 wt % Na 2 CO 3 and 5 wt % K 2 CO 3 are the optimal additive ratios for doped sorbents to attain the highest conversions. Moreover, under 15 vol % CO 2 , the doped sorbents present clearly faster absorption rates and exhibit stable cyclic durability with impressive conversions of about 90 %, at least 20 % higher than that of non‐doped Li 4 SiO 4 . The attained conversions are also 10 % higher than the reported highest conversion of 80 % on doped Li 4 SiO 4 . The performance of Li 4 SiO 4 is believed to be enhanced by the eutectic melt, and it is the first time that the existence of eutectic Li/Na or Li/K carbonate on doped sorbents when absorbing CO 2 at high temperature is confirmed; this was done using systematical analysis combining differential scanning calorimetry with in situ powder X‐ray diffraction.