Abstract
The development of technologies that allow us to reduce CO2 emissions is mandatory in today's society. In this regard, we present herein a comparative study of CO2 adsorption over three types of materials: zeolites, layered double hydroxides (LDH), and zeolites coated LDH composites. The influence of the zeolite Si/Al ratio on zeolites sorption capacity along with the presence of mesopores was investigated. By comparing these results with the well-known performance of LDHs, we aim to provide insights on the factors that may influence the CO2 capture capacity over zeolites, thus providing useful tools for tuning their properties upon post-treatments.
Highlights
The tremendous increase in the use of fossil fuels in the past 200 years has contributed to a steady rise of CO2 level in the atmosphere (Smil, 2017)
Fluoride-mediated synthesis of ZSM-5 zeolite crystals provides mild conditions, facilitating the formation of few nuclei under diluted conditions as consequence of a slow release of SiOxF−y species (Flanigen et al, 1986; Losch et al, 2017). The latter renders possible the formation of highly crystalline zeolites characterized by larger crystals with less defects and more open structures than in alkaline medium (Xu et al, 1990)
It has been clearly shown that CO2 capture strongly depends on the concentration of Al-atoms in the zeolite framework as well as its cation nature
Summary
The tremendous increase in the use of fossil fuels in the past 200 years has contributed to a steady rise of CO2 level in the atmosphere (Smil, 2017). Several efforts have been made to reduce those emissions, either by optimization of the current industrial processes, or by implementation of renewable energies where no CO2 is produced (Princiotta, 2011; Álvarez et al, 2017) The latter remain at a non-sufficiently mature state, hampered by high costs for their implementation and maintenance, mainly in developing countries (Mustapa et al, 2010; Horbach et al, 2014). This leads to the need to continue depleting fossil fuels to generate energy, and allow further release of CO2 in the atmosphere. A significant contribution comes from several industrial activities such as cement or steel production, whose CO2 emissions dramatically contribute to accelerate climate change
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