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Том 26, № 4 (2017)
- Год: 2017
- Статей: 4
- URL: https://journals.rcsi.science/1061-3862/issue/view/12285
Article
Microwave energy application to combustion synthesis: A comprehensive review of recent advancements and most promising perspectives
Аннотация
Microwave heating fundamentally differs from other heating techniques as the consequence of its unique characteristic of being based on the electromagnetic energy transfer from the microwaves source to the interacting material, which according to its electric, dielectric, and magnetic properties can convert the absorbed energy into heat. This peculiar heating mechanism is at the basis of plenty of unquestionable advantages that were reported during the last three decades in most of the different branches of chemistry as well as materials science, thus including also combustion synthesis. After a brief overview of the microwave heating fundamentals as well as of the different components constituting the scientific microwave applicators, all the most significant and recent advancements in the use of microwaves as energy source in both solid-state as well as solution combustion synthesis processes will be comprehensively reviewed, highlighting the unique opportunities arising from the coupling of these two energy efficient techniques. Moreover the possible employment of less conventional frequencies as well as the use of new-generation solid state generators will be critically discussed also in the framework of scaling-up and microwave reactor design considerations.
221-233
Catalytic Pd–Ag nanoparticles immobilized on fiber glass by surface self-propagating thermal synthesis
Аннотация
Pd–Ag nanoparticles with different Pd/Ag ratio were deposited onto fiber glass by using the technique of surface self-propagating thermal synthesis (SSTS) and characterized by X-ray photoelectron spectroscopy (XPS), atomic absorption spectroscopy (ААS), and EXAFS spectroscopy. The samples reduced in hydrogen exhibited the formation of Pd–Ag alloy whose tentative structure and composition were suggested. Thermally scheduled reduction of Pd–Ag catalysts in hydrogen made the Ag atoms partially oxidized. Reported are the catalytic properties of synthesized Pd–Ag samples in selective hydrogenation of acetylene.
234-239
AlON powders by aluminothermic SHS under pressure: Synthesis and characterization
240-243
AlON powders by SHS under nitrogen pressure with KClO4 as a booster
Аннотация
AlON powders were prepared by SHS under nitrogen pressure using KClO4 as a booster and characterized by XRD and SEM. The combustion product obtained under optimized conditions represented pure AlON powder that contained minimal amount of byproducts.
244-247