Effects of transition metal dopants on the calcination of CaCO 3 under Ar, H 2 O and H 2

T.T. Belete, M.C.M. van de Sanden, M.A. Gleeson (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

This study compares thermal decomposition of pure and transition metal-doped (Fe, Co, Ni, Cu, and Zn) calcium carbonate samples under 0.1 mbar of Ar, H 2 O, and H 2 in order to evaluate the effects of doping on CO 2 release and conversion. All samples were synthesized via precipitation methods at room temperature from calcium chloride and sodium carbonate precursors, with additional doping of the relevant transition metal chloride. Structural and compositional analysis of the as-prepared and calcined materials is presented. TM-doping results in an earlier onset of CO 2 release as compared to Pure CaCO 3 irrespective of calcination gas. Cu-doping induced the largest temperature reduction. Calcination in H 2 O produces an additional lowering of the release temperature, as compared with calcination in Ar, with the Zn-doped sample exhibiting the largest enhancement. During calcination in H 2 , the Ni-, Co- and Fe-doped samples produce a significant enhancement of CO 2 to CO conversion, whereas the overall conversion by the Cu- and Zn-doped samples remained comparable to that of Pure CaCO 3 . The Ni-doped samples, which produced the highest CO 2 conversion, showed the largest comparative enhancement when the calcination gas was changed to H 2 .

Original languageEnglish
Pages (from-to)152-166
Number of pages15
JournalJournal of CO2 Utilization
Volume31
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • Calcium carbonate
  • CO conversion
  • Hydrogen
  • Thermal decomposition
  • Transition metals
  • Water vapour

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