3 years ago

Effects of Drying Methods on Wet Chemistry Synthesis of Al-Stabilized CaO Sorbents for Cyclic CO2 Capture

Effects of Drying Methods on Wet Chemistry Synthesis of Al-Stabilized CaO Sorbents for Cyclic CO2 Capture
Ming Zhao, Guozhao Ji, Xu He, Xiaomin Cui, Xiao Zhao, Yinqiang Song
Al-stabilized CaO sorbents synthesized by wet chemistry methods have demonstrated effectiveness to mitigate CaO sintering during Ca-looping cycles (CaO + CO2 ⇌ CaCO3) for CO2 capture. To further screen the synthesis techniques and recipes, a series of Al-stabilized CaO sorbents, namely, CaO–Ca9Al6O18 hybrid materials, derived from cosolutions of calcium acetate and aluminum nitrate were prepared using three different drying methods, i.e., freeze drying, spray drying, and evaporation drying. These sorbents were then characterized by X-ray diffraction, N2 physisorption, scanning electron microscopy, and energy dispersive spectrometry. The effects of drying methods on the CO2 capture performance of the sorbents were analyzed comprehensively. Out of the three drying methods, spray drying enabled the optimal textural property and the hard skeleton with sufficient mechanical strength, resulting in the supreme CO2 capture capacity. Furthermore, it was found that, by spray drying, the inert spacer Ca9Al6O18 could play the most significant role in stabilizing the cyclic sorption reactivity of CaO. For spray dried samples, the SD70 sample with 70 wt % CaO and 30 wt % Ca9Al6O18 could well balance the capacity and stability under mild conditions. Its advantage was much more pronounced under severe conditions, where SD70 overtook other samples in CO2 uptake capacity from the fourth cycle and maintained the highest CaO conversion all through the 30 cycles.

Publisher URL: http://dx.doi.org/10.1021/acs.energyfuels.7b02330

DOI: 10.1021/acs.energyfuels.7b02330

You might also like
Never Miss Important Research

Researcher is an app designed by academics, for academics. Create a personalised feed in two minutes.
Choose from over 15,000 academics journals covering ten research areas then let Researcher deliver you papers tailored to your interests each day.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.