4.7 Article

Scalable synthesis of KNaTiO3-based high-temperature CO2 capture material from high titanium slag: CO2 uptake, kinetics, regenerability and mechanism study

期刊

JOURNAL OF CO2 UTILIZATION
卷 49, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2021.101578

关键词

KNaTiO3; High titanium slag; CO2 capture; CO2 partial pressure

资金

  1. Fundamental Research Funds for the Central Universities [2019JQ03015]
  2. National Natural Science Foundation of China [42075169, U1810209]
  3. International Science and Technology Cooperation Project of Bingtuan [2018BC002]
  4. Beijing Municipal Education Commission through the Innovative Transdisciplinary Program Ecological Restoration Engineering

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The study successfully prepared CO2 sorbents based on high titanate slag (HTS), with outstanding sorption capacity, stability, fast reaction kinetics, low cost, and promising practical applications.
KNaTiO3 is a novel type of solid CO2 sorbents with strong sorption capacity and excellent regenerability at high temperatures. However, the expensive titanium precursor hampers its implementation for industrial applications. Herein, advanced KNaTiO3 based CO2 sorbents were first fabricated directly from high titanate slag (HTS). Elemental mapping analysis reveals high dispersion of KNaTiO3 and the crystal structure of KNaTiO3 in KNaTiO3HTS-3 almost unchanged even after 15 cycles. The carbonation conversion of KNaTiO3-HTS-3 preserved a highly commendable value even after 100 sorption/desorption cycles, outperforming pure KNaTiO3. In addition, this sorbent exhibited faster sorption rate at 700 degrees C. Dynamic simulation demonstrated that the sorption constants k(1) and k(2) are higher and the activation energy is lower than those of conventional high-temperature sorbents. The CO2 sorption capacity of KNaTiO3-HTS-3 only met a slight decrease from 15.7 to 14.6 wt% with the decreasing CO2 concentration from 100 to 10 vol%. Compared with traditional high temperature CO2 sorbents, KNaTiO3HTS-3 shows a slower breakthrough time. The reaction mechanism process for the promising sorbent is proposed. The HTS-derived KNaTiO3-based high-temperature CO2 sorbent has outstanding CO2 uptake, excellent regenerability, fast reaction kinetics as well as low cost, offering bright prospects in practical applications.

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