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Title: The Effects of Iron and Manganese Doping on the Carbonation of Brucite [Mg(OH)2]

Journal Article · · Journal of Physical Chemistry. C
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [3];  [4];  [5]; ORCiD logo [1]
  1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
  3. Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
  4. Univ. of Chicago, IL (United States)
  5. Pennsylvania State Univ., University Park, PA (United States)

Brucite [Mg(OH)2] is a promising sorbent for carbon dioxide removal (CDR) due to its availability and low calcination temperatures. However, natural and synthetic brucites tend to contain metal impurities, such as iron or manganese, and how these impurities affect the interfacial chemical reactivity is uncertain. Here, in this study, the impact of low concentrations of iron and manganese impurities on the carbonation efficiency of Mg(OH)2 was examined. Mg(OH)2 with small amounts (1–5 mol %) of Fe and Mn was synthesized. The increasing substitution of Fe into Mg(OH)2 was accompanied by the oxidation of Fe. The phase transformation sequence during the carbonation was found to be brucite [Mg(OH)2] → amorphous magnesium carbonate (MgCO3·nH2O) → nesquehonite (MgCO3·3H2O), regardless of impurity concentration. Both the Fe- and Mn-doped Mg(OH)2 samples were more reactive than endmember Mg(OH)2, possibly due to their higher surface areas and lower stabilities. During carbonation, 3 mol % Fe- and Mn-doped Mg(OH)2 showed the highest reactivity. The variance in reactivity for Mn-doped Mg(OH)2 was less than that of Fe-doped Mg(OH)2. These results suggest that natural or industrial waste Mg(OH)2 with less than 5 mol % Fe and Mn impurities may be targeted as more effective CDR sorbents than endmember Mg(OH)2.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-06CH11357; AC05-00OR22725
OSTI ID:
3030335
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 6 Vol. 130; ISSN 1932-7455; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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