Mateus F. Paiva

Université de Lille

Most of the supporting catalytic materials seek to improve classical chemical processes that are less environment-friendly. The association of heteropolyacids (HPA) and zeolites has shown to be interesting for heterogeneous catalysis. In the present study, zeolite Y (faujasite) was modified by the incipient insertion of 12-tungstophosphoric (HPW) a...

Poly(lactic acid) (PLA) is an important polymer that is based on renewable biomass resources. Because of environmental issues, more renewable sources for polymers synthesis have been sought for industrial purposes. In this sense, cheaper monomers should be used to facilitate better utilization of less valuable chemicals and therefore granting more...

There is a demand for renewable resources, such as biomass, to produce compounds considered as platform molecules. This study deals with dehydration of fructose for the formation of 5-hydroxymethylfurfural (HMF), a feedstock molecule. Different catalysts (aluminosilicates, niobic acid, 12-tungstophosphoric acid—HPW, and supported HPW/Niobia) were s...

Magnetic nanoparticles based on magnetite (MNP) are important materials for different research applications, particularly when they are coated with inert phases. For instance, coating them with silica forms [email protected]2, which has various uses, including as a support for catalysts because it has surface functional groups that form bonds to a...

Ordered mesoporous silica (OMS) is an important and useful material for a variety of applications, including catalysis, adsorption, sensing and controlled drug delivery. The surface chemistry and the silanol groups on OMS pores are key properties for the potential modification and application of this material. This research aimed to synthesize (usi...

The increasing demand for environmentally friendly processes made obsolete the use of inorganic acid catalysts in homogeneous reactions. From this perspective, the demand and production of materials whose catalytic efficiency can be increased has been highlighted in academic research. Keggin type heteropolyacids (HPA’s), classically used in Bulk ca...

Poly(lactic acid) (PLA) is a significant polymer that is based on renewable biomass resources. The production of PLA by polycondensation using heterogeneous catalysis is a focus for sustainable and economical processes. A series of samples comprising 12-tungstophosphoric acid (H3PW) supported on activated carbon, silica, and alumina induced the cat...

Catalytic materials supported on solid matrices have driven progress in classical processes in the search for high catalytic activity. This report provides a comprehensive comparison of twelve composites prepared by impregnation of two heteropolyacids (H3PW12O40 and H4SiW12O40) on zeolites BEA and Y (X%HPA/Zeolite). The materials were characterized...

Zeolites and polyoxometalates are catalysts used in important environmental processes and their combination produces a new solid tailoring the advantages of both catalysts. In this work, supported H3PW12O40 or H4SiW12O40 on zeolite Y was prepared by incipient and aqueous impregnation, which maintained the Keggin structure. The dispersion of H3PW12O...

This work deals with preparation and characterization of H3PW12O40 (H3PW) supported on silica-alumina. Impregnation of H3PW (15, 20, 30 and 40 wt.%) on commercial silica-alumina support in acidic aqueous solution is effective for preparing this catalyst keeping its Keggin structure, according to different methods of characterization. The catalysts...