Author Archive

A Fine Catalysis Meeting in Sicily

The second “FineCat – Symposium on heterogeneous catalysis for fine chemicals” was held in Palermo, Italy, on April 10-11, 2013. With delegates coming from all over the world, it was two intense days of lectures and poster presentations. Some of the topics covered included biomass conversion, flow chemistry, catalysis with metal nanoparticles, heterogeneous photocatalysis and doped hybrid silicas. A poster prize was also offered, which Natcha Wongpraphairoat from Chulalongkorn University, Thailand, won with her poster on the the catalytic conversion of glycerol to propylene glycol over supported copper/ZnO catalysts.

To find out more about the conference, a more detailed report can be found here, or you can download the conference report in pdf.

Next year’s conference will be held Sicily on April 9-10, 2014, with further details here. So if you are interested in catalysis, why not consider a working holiday in Sicily next year?

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Green synthesis of polyurea with microwaves

Polyureas, which contain the –NHCONH– unit in their backbone, have a wide variety of uses, such as in foams, fibres and biomedical applications. Traditionally, they are made via a process that uses toxic carbonylating agents such as phosgene or isocyanate, and the by-products of the reaction are also hard to recycle. Needless to say, it would be desirable to produce polyureas by a more environmentally friendly method.

In this paper, the authors report one such technique. They have synthesised a polyurea, [6]-oligourea, with a microwave assisted method that uses a green carbonylating agent and an organocatalyst. After optimising the experimental conditions, they found that with 10W of fixed-mode microwave energy applied to the reactants, they were able to achieve almost 100% yield. The by-products of the reaction are also more easily recycled than from traditional methods.

This synthetic method opens the way to producing polyureas in a eco-friendly, efficient way.

Highly efficient isocyanate-free microwave-assisted synthesis of [6]-oligourea

Read their paper to find out more:

Highly efficient isocyanate-free microwave-assisted synthesis of [6]-oligourea
Abdussalam K. Qaroush, Asmaa S. Al-Hamayda, Yasmeen K. Khashman, Sergei I. Vagin, Carsten Troll and Bernhard Rieger
Catal. Sci. Technol., 2013, Advance Article
DOI: 10.1039/C3CY00117B, Paper

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Improving photocatalytic properties of titanium oxide with a new doping method

TiO2 nanotubes demonstrate photocatalytic properties that make them useful in applications such as decomposition of organic pollutants. These nanotubes are commonly grown in an anodization process that takes place in an electrolytic bath, with dopants, which are used to modify the catalytic properties of the nanotubes, added at a later stage.

In this paper, Hahn and co-workers have demonstrated a new growth method in which the desired dopants are dissolved in the electrolyte solution. The nanotubes grown from this solution incorporate the dopants, and no further treatment is required. A test of the photocatalytic properties of the nanotubes also confirms that it behaves very similar to nanotubes grown by conventional methods. This fast and convenient way of manufacturing doped TiO2 nanotubes opens the route to many potential future applications.

 Photocatalytic properties of in situ doped TiO2-nanotubes grown by rapid breakdown anodization

Find out more by reading the full article:

Photocatalytic properties of in situ doped TiO2-nanotubes grown by rapid breakdown anodization
Robert Hahn, Martin Stark, Manuela Sonja Killian and Patrik Schmuki
Catal. Sci. Technol., 2013, Advance Article
DOI: 10.1039/C3CY00021D

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