Abstract
In this article we report on the spectroscopic and adsorptive studies done on Ce(III)-based MOF possessing, upon desolvation, open metal sites, and a discrete surface area. The Ce-based MOF was synthesized from terephthalic acid linker (H2BDC) and Ce3+ cations by the classical solvothermal method. Preliminary powder X-ray diffraction analysis showed that the obtained materials corresponded to the ones reported by other authors. Spectroscopic techniques, such as XAS and in situ FTIR with probe molecules were used. In situ FTIR spectroscopy confirmed the successful removal of DMF molecules within the pore system at temperatures above 250 °C. Moreover, the use of CO as a probe molecule evidenced the presence of a Ce3+ open metal sites. Detailed volumetric and calorimetric CO2 adsorption studies are also reported.
Highlights
Cerium is the most abundant lanthanide element present in the earth crust [1,2] and the ores that are mined for the extraction of more rare and precious rare earth elements (REEs) are rich in Ce; its cost is relatively low
The porosity of the material has not been studied, here we report on its adsorption the porosityexamined of the material has spectroscopic not been studied, here report on itsFTIR)
Ce5 (BDC)7.5 (DMF)4 MOF [16] optimized synthesis is reported in the Supplementary Materials
Summary
Cerium is the most abundant lanthanide element present in the earth crust [1,2] and the ores that are mined for the extraction of more rare and precious rare earth elements (REEs) are rich in Ce; its cost is relatively low. CeO2 , commonly named ceria, is relevant for redox chemistry, being a catalyst for oxidation and reduction reactions [3], for example, combustion catalysis [4] and photocatalysis [3]. Ce-based MOFs have recently created interest in the scientific community. Ce4+ oxidation states can be used in the synthesis of MOFs [5–9]; (ii) synthetic conditions for. Ce3+ -containing MOFs tends to be harsher than Ce4+ [5,6,10]; (iii) usually, Ce4+ starting reagents may be reduced to Ce3+ during the synthesis [11,12]; (iv) Ce3+ materials more frequently have peculiar structures, while Ce4+ tends to give rise to MOFs with the same structure as other 4+. Cations (e.g., Zr4+ or Hf4+ ) [5–7,13,14]. Their thermal stability is generally lower than their Zr4+. As a possible application of Ce MOFs as redox catalysts, Smolders et al [8]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
