International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

This study is aimed at the development of active and selective ceria-based catalysts for hydrogen production by methanol decomposition. The effectс of ceria modification with different metal oxides and development of mesoporous texture of the composites wере illustrated. The microstructure of the obtained catalysts was studied in details by different physicochemical techniques, such as nitrogen physisorption, XRD, HRTEM, SEM, various spectroscopic methods and TPR with hydrogen. The bi-metallic spinel oxides revealed promising potential for the synthesis of more active and selective catalysts. The catalyst formula was optimized using mesoporous ceria doped with iron oxide as catalyst support and deposition of nickel oxide nanoparticles on it.

This study is aimed at the preparation of mesoporous Cu-Ti-M oxide composites (M=Ce, Zr, Sn) by combination of template assisted hydrothermal technique with the conventional impregnation or novel “chemisorption -hydrolysis” techniques. The obtained materials are characterized by nitrogen physisorption, XRD, SEM, FTIR, HRTEM, XPS, TPR and tested as catalysts for ethyl acetate oxidation, as a probe VOCs molecule. The regulation of the microstructure, surface and redox properties and the related catalytic behavior of the composites by changing of the metal oxide dopant and preparation technique used is discussed in details.

The current study is focused on the development of integrated system for safety production and storage of hydrogen with a potential impact to the “Circle Economy”. The possibility of methanol production from diverse waste sources determines its key role in the integrated scheme. The originality of the proposed system is the conversion of the waste sources (different agricultural residues, coal tar pitch from low-rank coals, waste motor oils and polyolefin wax) to activated carbons by suitable technologies. Further, these activated carbons are modified with finely dispersed zinc ferrite nanoparticles. The obtained composites are used as catalysts for hydrogen release from methanol by decomposition. The phase composition, surface functionality, texture and structure features of the catalysts are characterized by X-ray diffraction, Low-temperature nitrogen physisorption, Moessbauer spectroscopy and Boehm method. The possibility for the regulation of the catalyst efficiency by simple selection of the activated carbon waste precursor is demonstrated.