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The Effect of Alkali Metals (Li, Na, and K) on Ni/CaO Dual-Functional Materials for Integrated CO 2 Capture and Hydrogenation.

Yong HuQian XuYao ShengXueguang WangHongwei ChengXingli ZouXiong-Gang Lu
Published in: Materials (Basel, Switzerland) (2023)
Ni/CaO, a low-cost dual-functional material (DFM), has been widely studied for integrated CO 2 capture and hydrogenation. The core of this dual-functional material should possess both good CO 2 capture-conversion performance and structural stability. Here, we synthesized Ni/CaO DFMs modified with alkali metals (Na, K, and Li) through a combination of precipitation and combustion methods. It was found that Na-modified Ni/CaO (Na-Ni/CaO) DFM offered stable CO 2 capture-conversion activity over 20 cycles, with a high CO 2 capture capacity of 10.8 mmol/g and a high CO 2 conversion rate of 60.5% at the same temperature of 650 °C. The enhanced CO 2 capture capacity was attributed to the improved surface basicity of Na-Ni/CaO. In addition, the incorporation of Na into DFMs had a favorable effect on the formation of double salts, which shorten the CO 2 capture and release process and promoted DFM stability by hindering their aggregation and the sintering of DFMs.
Keyphrases
  • low cost
  • metal organic framework
  • transition metal
  • risk assessment
  • human health
  • health risk
  • climate change
  • health risk assessment
  • heavy metals
  • oxide nanoparticles