19 април 2021
Ivanova, R., Tsyntsarski, B., Issa, G., Spassova, I., Kovacheva, D., Velinov, N., Tsoncheva, T..
(
Николай Велинов;
)
Abstract
Activated carbon was prepared from cherry stones residues and used as a host matrix of nanosized M0.5Zn0.5Fe2O4 (M = Cu, Co, Mn, Ni) ferrites. The obtained composites were characterized by Low-temperature nitrogen physisorption, powder X-ray diffraction, Mossbauer and Infrared spectroscopies and temperature-programmed reduction with hydrogen. Their catalytic activity in methanol decomposition as a source of hydrogen was studied in details. The textural analysis demonstrated significant stability of the carbon support during the deposition of the ferrite phase. XRD and Mossbauer data revealed that the loaded metal oxide phase represented a complex mixture of finely dispersed ferrite and substituted magnetite particles. The catalysts based on Cu- and Co-containing ferrites demonstrated fast deactivation in methanol decomposition due to the agglomeration of the active particles and significant structural collapse of the activated carbon. The highly exposed to the reactants Mn2+-Fe3+ redox pairs in Mn0.5Zn0.5Fe2O4 ferrite modification promoted the catalytic process at lower temperature. The observed extremely high catalytic activity for the Ni0.5Zn0.5Fe2O4 modification was related to the synergistic activity of Ni and ZnO nanoparticles, produced under the reaction medium. The obtained results demonstrated the potential of the activated carbon obtained from waste cherry stones for the preparation of cheap and effective catalysts for hydrogen production.
Bulgarian Chemical Communications, 53, A, 2021, 93-100. SJR (Scopus):0.179 Q4 (Scopus)
http://www.bcc.bas.bg/BCC_Volumes/Volume_53_Special_A_2021/BCC2021-53-SI-A-093-100.pdf
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