Bruno Machado

In the present study, the photochemical deposition method was compared against the usual incipient wetness procedure in the preparation of supported Pt catalysts. Particular attention was given to parameters such as nature of the support (multiwalled carbon nanotubes, MWNT vs. titanium dioxide, TiO2) and reduction temperature. Supported 1% wt Pt catalysts treated in hydrogen at 773K showed improved activity and selectivity towards cinnamyl alcohol (50.8 and 57.4% were observed in MWNT and TiO2 SMSI effect, respectively) when comparing to those untreated (45.8 and 28.9, MWNT and TiO2, respectively). The best catalytic performance was achieved by a 5% wt Pt supported in TiO2 catalyst treated in hydrogen at 773K. Selectivity to unsaturated alcohol as high as 63.2% at 80% conversion was observed.

Cinnamyl alcohol

Titanium Dioxide

Source

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Graphene-based materials for catalysis

Catalysis Science & Technology (2011)

Bruno Machado Philippe Serp

Graphene is one of the most promising materials in nanotechnology. From a theoretical point of view, it provides the ultimate two-dimensional model of a catalytic support. Its unique physical, chemical and mechanical properties are outstanding, and could allow the preparation of composite-materials with unprecedented characteristics. Even though the use of a single graphene sheet as a catalytic support has not yet been reported, some promising results have already been obtained with few-layer graphene. In this review, we will briefly discuss the most relevant synthetic routes to obtain graphene. Then, we will focus our attention on the properties and characterization techniques of graphene that are of relevance to catalysis, with emphasis on adsorption. After presenting an overview of the most common and effective preparation methods, we will discuss the catalytic application of graphene and graphene-based composites, with particular attention on energy conversion and photocatalysis.

Characterization

10.1039/c1cy00361e

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IUPAC Anunciou as Dez Principais Tecnologias Emergentes em Química em 2023

Boletim da Sociedade Portuguesa de Química (2024)

Bruno Machado

Chemical nomenclature

10.52590/m3.p709.a30002783

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LIQUID-PHASE HYDROGENATION OF UNSATURATED ALDEHYDES: ENHANCING SELECTIVITY OF MWCNT CATALYSTS BY THERMAL ACTIVATION