Inorganic fibers and their application in catalysis

LEONARDI, SABRINA A.; M.L. GODOY; SACCO, N.A.; MILT, V.G.; BORTOLOZZI, J.P.; BANÚS, E.D.

Advances in Material Research and Technology Series

Springer

Año: 2023

2662-4761

Fibers have many applications, including catalysis. In recent years, the use of fibers hasemerged as a special type of structure that serves both as a support for active phases andas an active material in various reactions of industrial and environmental interest. Thischapter is devoted to review the methods of synthesis of fibers of different materials, theconformation of structured catalysts and their application in the oxidation reactionsstudied in our laboratory. Fibers of single and mixed oxides of Ce, Zr and Co wereprepared by different methods: hydrothermal synthesis, electrospinning and thebiomorphic method and tested for soot combustion and CO oxidation, showing verygood activity. Each method has advantages and disadvantages, with the biomorphicmethod being the simplest and most environmentally friendly. Commercialsilica-alumina fibers were structured as ceramic paper by the conventional papermakingmethod and used as a support for a series of active phases, CoCe, MnCe, CoLa, CoBaand CoBaK, and applied for diesel soot combustion. Ni, NiZr and NiCe systems wereused for the oxidative dehydrogenation of ethane to obtain ethylene. Catalytic cartridgesmade of metal fibers were also used for the oxidation of VOCs, CO and diesel soot, theactive phases being Co, Ce and PtCe deposited on stainless steel fibers. The fresh andused catalysts were characterized by several techniques to study the physicochemistryand morphology of both the active phases and the supports. Finally, in order to foreseethe applicability of the catalytic paper and stacked wire mesh cartridges for diesel sootfiltration and oxidation, they were scaled up and tested on a bench diesel engine,obtaining very promising results.