Two-component Pd-containing composites based on aerogel-prepared MgO for catalytic dehydrogenation of ethane

• Published in: Journal of sol-gel science and technology 2023-02, Vol.105 (2), p.315-323
• Main Authors: Veselov, Grigory B., Ilyina, Ekaterina V., Vedyagin, Aleksey A.
• Format: Article
• Language: English
• Subjects: Aerogels; Alkanes; Alkenes; Brief Communication: Sol-gel and hybrid materials for catalytic; Catalysis; Catalysts; Ceramics; Chemistry and Materials Science; Composite materials; Composites; Copper; Dehydrogenation; Ethane; Glass; Hydrogen; Inorganic Chemistry; Iron; Magnesium oxide; Materials Science; Nanotechnology; Natural Materials; Nickel; Optical and Electronic Materials; Oxygen; Palladium; photoelectrochemical and sensor applications; Temperature
• ISSN: 0928-0707; 1573-4846
• DOI: 10.1007/s10971-022-05999-3

MgO-based aerogel composites are attractive as heterogeneous catalysts. The present research is aimed to develop an efficient system for olefins production via dehydrogenation of corresponding alkanes. In order to improve the yield of target olefin, an approach considering the uptake of released hydrogen by so-called oxygen carrier systems was utilized. Thus, the composite systems consisting of the Pd-Mg-O component, responsible for the dehydrogenation stage, and the M-Mg-O (M = Ni, Cu, Fe) component, serving as an oxygen carrier, were prepared and characterized. The reproducibility of the samples towards the hydrogen uptake in consecutive redox cycles was studied by the temperature-programmed reduction method. The efficacy of the composites was compared in a model reaction of ethane dehydrogenation. Graphical abstract The joint use of the aerogel-derived Pd-Mg-O catalyst with the sol-gel-derived M-Mg-O (M = Ni or Fe) co-catalyst in the ethane dehydrogenation process allows increasing the ethylene yield noticeably. Details: The Pd-Mg-O catalyst was prepared via aerogel technique. A series of M-Mg-O (M = Ni, Fe, Cu) oxides was obtained by sol-gel approach. The materials were characterized by a set of physicochemical methods. The catalytic activity of the mixed samples was studied in the ethane dehydrogenation reaction. Highlights MgO-based composites were prepared and characterized. The aerogel-derived Pd-Mg-O catalyst possesses specific surface area exceeding 200 m 2 /g. The M-Mg-O (M = Ni, Cu, Fe) systems were used as oxygen carrier. Fe-Mg-O/Pd-Mg-O and Ni-Mg-O/Pd-Mg-O composites exhibit an improved catalytic performance in ethane dehydrogenation.