Phase diagram of CaSO4 reductive decomposition by H2 and CO

Zheng, Mianping; Xing, Yanbing; Zhong, Simei; Wang, Hua

doi:10.1007/s11814-016-0360-7

Cited by 10 publications

(2 citation statements)

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“…However, reductive potential (PH 2 /pH 2 O) is known to be one of the most important parameters to decide the decomposition mechanism of CaSO 4 . 47 Since steam was also present under reducing atmosphere in this study, although the amount was very small, CaSO 4 could be observed in the system after the reduction. No new Ca−Fe-based oxide or other reaction product was observed in the experiments, which is also consistent with the results provided by Thermodynamic Equilibrium Calculations (TEC).…”

Section: Resultsmentioning

confidence: 64%

“…CaSO 4 can be reduced to CaS in the presence of reducing atmospheres such as H 2 and CO. However, reductive potential (PH 2 /pH 2 O) is known to be one of the most important parameters to decide the decomposition mechanism of CaSO 4 . Since steam was also present under reducing atmosphere in this study, although the amount was very small, CaSO 4 could be observed in the system after the reduction.…”

Section: Resultsmentioning

confidence: 74%

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Comparative Study: Impacts of Ca and Mg Salts on Iron Oxygen Carriers in Chemical Looping Combustion of Biomass

Steenari

Leion

2021

ACS Omega

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Chemical looping combustion (CLC) is one of the most promising methods for carbon capture and storage (CCS). An oxygen carrier, i.e., a mineral that can be oxidized and reduced, is used to convert the fuel in the process. The produced CO 2 is inherently separated from the air components that enables easier CCS. The use of biomass-based fuels is desirable since it can lead to negative CO 2 emissions. On the other hand, alkali compounds from the biomass may interact with the oxygen carrier causing problems, such as deactivation of the oxygen carrier. The most common oxygen carriers contain iron, since iron-based ores and industrial waste materials are readily available and cost-efficient. Therefore, the interaction between the iron oxygen carriers and the biomass ash-forming compounds needs to be investigated. Since Ca/Mg are abundant in biomass, it is important to clarify how their compounds interact with the oxygen carrier. In this study, the effect of Ca/Mg carbonates, chlorides, nitrates, sulfates, and phosphates along with synthetic biomass-derived ash on iron oxides was investigated. Redox reactions were investigated at 950 °C during 5 h under both oxidizing and reducing atmospheres. The results showed that the effect of Ca/Mg salts on the oxygen carrier varied depending on the anion of the salt. Generally, the nitrate- and phosphate-based salts of both Ca and Mg showed the harshest effect regarding agglomeration of the oxygen carriers. It was shown that the Ca/Mg-based compounds interacted differently with iron oxides, which was an unexpected result.

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Section: Resultsmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 74%