PERSPECTIVE: Positive cooperativity and enhanced selectivity

In this Catalysis Science & Technology PERSPECTIVE, David Glueck examines several examples of structure–selectivity relationships with the eventual goal of designing substrates for positive cooperativity and enhanced selectivity in asymmetric catalysis.   This kind of systematic investigation hopefully is the way forward to rationally improve selectivity.

Read more at:
Selectivity via catalyst or substrate control in catalytic asymmetric transformations of bifunctional symmetrical substrates
Catal. Sci. Technol., 2011, Advance Article
DOI: 10.1039/C1CY00048A, Perspective

Designing substrates

Designing substrates for positive cooperativity and enhanced selectivity in asymmetric catalysis

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Catalysis Science & Technology Poster Prize – Applied Catalysis Symposium

Catalysis Science & Technology were delighted to sponsor the poster competition at the Applied Catalyst Deactivation symposium in Billingham, UK, hosted by the RSC Applied Catalysis Group.

Judging was by eminent trio Prof David Jackson, Prof Ken Waugh & Dr John Casci, who awarded the best poster prize to Helen Daly, from Queens University Belfast.

Helen’s work was entitled ‘The effect of reaction conditions on the stability of Au/CeZrO4 catalysts in the low temperature water gas shift reaction’, and is part of her research in Chris Hardacre’s group in Belfast.

Mike Wood, Vice President of research and development at Davy Process Technology, commented that  ‘We were particularly pleased with the quality of all the posters and quantity’

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Celebrating in style in Anaheim, USA

Celebrating the launch of Catalysis Science & Technology

Last week in Anaheim, during the ACS Spring National Meeting, we celebrated the launch of Catalysis Science & Technology.

To a packed audience, Associate Editor Professor Paul Chirik introduced the journal, explaining the ever increasing importance of catalysis to address the global challenges we face today. Catalysis Science & Technology was launched to bring together the best catalysis research, from heterogeneous, homogeneous and biocatalysis, in one journal, owned and published by a society publisher.

Associate Editor Paul Chirik (Princeton University)

At the end of the evening, a prize draw took place, to win an ipod nano.  Congratulations to Dr Andrew Dove (University of Warwick, UK), who won the prize!

Issue One of Catalysis Science & Technology is available free online. Take a look today!

Celebrating Catalysis Science & Technology

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Hot Article: Splitting carbon dioxide with light

Carbon dioxide is one of the major contributors to global climate change and there are mounting concerns over the emission of such greenhouse gases.  Research into the reduction of CO2 emissions is widespread.  The development of technologies to generate renewable energies is the most desirable way in the long term.

However, at present, these technologies are not able to replace existing fossil fuel-based power generation. Recent innovations have made the photocatalysis technology a potentially promising alternative.

Now, in this Catalysis Science & Technology Hot Article, Pratim Biswas et al., from Washington University in St. Louis, USA describe, for the first time, the rapid and direct synthesis of nanostructured copper-doped titania–silica (Cu–TiO2–SiO2) composite particles for CO2 photoreduction using a furnace aerosol reactor (FuAR). This method is both simple and effective, with an extremely short processing time ( several seconds).

Read the article for free here.

Rapid synthesis of nanostructured Cu–TiO2–SiO2 composites for CO2 photoreduction by evaporation driven self-assembly
Wei-Ning Wang, Jinho Park and Pratim Biswas
Catal. Sci. Technol., 2011, Advance Article, DOI: 10.1039/C0CY00091D

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HOT Article: Biocatalysis with Old Yellow Enzymes

In this Catalysis Science & Technology Hot article Nigel S. Scrutton and coworkers from the University of Manchester look at pentaerythritol tetranitrate reductase (PETN reductase) and how site-directed mutagenesis can effect its biocatalytic action.

Scrutton uses PETN, which is a member of the Old Yellow Enzyme family of enzymes. Old Yellow Enzymes were first isolated from brewers’ bottom yeast back in 1932, and they have been extensively studied ever since.

Read the full article to find out more about the role of key active sites in PETN reductase…

Active site modifications in pentaerythritol tetranitrate reductase can lead to improved product enantiopurity, decreased by-product formation and altered stereochemical outcome in reactions with α,β-unsaturated nitroolefins
Anna Fryszkowska, Helen Toogood, Michiyo Sakuma, Gill M. Stephens, John M. Gardiner and Nigel S. Scrutton
Catal. Sci. Technol., 2011, Advance Article
DOI: 10.1039/C0CY00092B, Paper

FREE TO READ!

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Perspective: Inorganic membranes for hydrogen production

In mankind’s quest for clean energy and environmentally friendly (and more sustainable) alternatives to fuel vehicles, the production of electricity through hydrogen fuel cells is attracting ever growing interest. Fuel cells, in the specific proton exchange membrane fuel cells (PEMFCs), are promising candidates due to their limited size, their low working temperature and the absence of polluting side-products. The major drawback to this technology is the need for highly pure hydrogen since even very low amounts of contaminants can poison the system and reduce the efficiency of the cell or even damage it irreversibly.

It is in the production of high grade hydrogen on industrial scale that membranes might play another essential role. From 1995 onwards, the amount on research on hydrogen production via membrane reactors has grown drastically. In addition, this research is focusing on processes that use renewable or sustainable starting materials.

 In a recent Catalysis Science & Technology review, Iulianelli and Basile of the University of Calabria give an elegant description of the state-of-the-art hydrogen production methods and discuss in depth the advances of the more novel inorganic membrane-based reactors.

The process of ethanol conversion into hydrogen using membranes and the more common steam reforming technology are presented in chemical and thermodynamic terms, followed by a brief but accurate review of the materials employed in the fabrication of such membranes and their physical characteristics, with emphasis on the most efficient and promising ones like palladium-based membranes (which drawbacks are also highlighted).

The review also includes a large series of examples of the activity of Pd-membranes in combination with several inorganic catalysts, with clear indication of yields and operating conditions. The authors` perspective on the future of this emerging technology concludes a very informative work.

Read the full review here.

Hydrogen production from ethanol via inorganic membrane reactors technology: a review
A. Iulianelli and A. Basile

Catal. Sci. Technol., 2011, Advance Article
DOI: 10.1039/C0CY00012D, Perspective

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Water-splitting titania: effect of doping on fabrication

Hydrogen is undoubtedly one of the most appealing candidates as a replacement for fossil fuels in the automotive sector. Despite the logistical difficulties connected to storage and transportation, hydrogen still remains the most environmentally friendly and sustainable fuel available.

The most common source of hydrogen is steam reforming of hydrocarbons, but intensive research has been devoted to more sustainable production processes such as the thermochemical and photochemical splitting of water into its components.

Several titanium, niobium and tantalum based materials have been employed in the preparation of suitable catalysts for the photochemical splitting of water, often suffering from weaknesses such as limited absorbtion of light in the visible region, chemical instability and other issues related to the materials` morphology.

A recent study by Jiang et al. on doped titania addresses the latter concerns; the group investigated the effect of molibdenum doping (which increases the photonic efficiency of the catalyst) and thermal treatments in the layer-by-layer fabrication of catalytic films.

The study highlights how the concentration of molibdenum affects the temperature of the transitions between different morphologies and the effect of the thermal tratments conducted on the material. A detailed characterisation of the catalysts by TEM, XPS, XRD as well as their photochemical activity shows that the presence of opportune amounts of molibdenum allow for an easier control of the morphology in the fabrication of the material and that higher concentrations of dopant result in a higher photocatalytic actvity.

For more details, please find the full communication here.

Structural and morphological control of Mo doped titania films
Chunxiang Li, Zhongping Yao, Guangmei Wu, Zhaohua Jiang and Fangzhou Jia
Catal. Sci. Technol., 2011, Advance Article
DOI: 10.1039/C1CY00024A, Communication

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Issue One now online!

The inaugural issue of Catalysis Science & Technology has been published today!

Front Cover by Graham Hutchings

In the editorial in this first issue, the Editors-in-Chief and Managing Editor describe the journal and their aims and aspirations for this new RSC Publication.

‘With today’s society demanding cheaper medicines and changes in resources for energy, bulk and fine chemicals, the contribution of catalysis to meet these challenges will be indispensable. Catalysis Science & Technology will play a key role in communicating these new developments to the community.’ P.van Leeuwen, C. Friend, J. Humphrey, Catal. Sci. Technol., 2011, 1, 11-12.

Issue 1 of Catalysis Science & Technology is now published online and access is free upon registration. This issue includes the following articles:

In their Perspective, Kalluri Ranganath and Frank Glorius highlight the potential application of (superpara) magnetic nanoparticles in asymmetric catalysis.   Read the article here.

José Fierro and colleagues discuss the fundamentals and factors influencing the removal of the least reactive sterically hindered S-containing compounds present in transportation fuels. In the second part of their Perspective review they focus on the progress made in alternative process concepts and technologies that are being developed for ultra low sulfur fuel.    Find out more here.

Wieslaw Roth and Jiří Čejka discuss two-dimensional zeolites – a promising and exciting area of solid materials research with high practical potential in adsorption and catalysis.  Read more about this in the article here.

John Fossey's Inside Cover

Make sure you keep up-to-date with the latest issue by signing up for the Catalysis Science & Technology e-alert and newsletter.

And we hope this first issue encourages you to submit your work to Catalysis Science & Technology.

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Perspective: Heterogenised bio-inspired catalysts

Enzymes are by far the most active and selective catalysts known to chemistry but although progress has been made to incorporate them into industrial use (i.e. in batch reactors, fixed bed immobilised enzyme reactors), their intrinsic biological nature makes them too substrate-specific and limits them to a reduced range of operational conditions.

In an attempt to bypass these limitations, scientists developed bio-inspired catalysts: structures designed upon the active sites of enzymes but lacking the organic framework that characterise them, making them easier to heterogenise, recover and more resilient to harsh conditions than their natural counterpart.

To reintroduce the selectivity given by the enzyme`s structure, these catalysts can be incorporated into micro- or mesoporous supports such as silica and zeolites exploiting ionic interactions between metal and support or different anchoring techniques.The selectivity is mostly size-driven, dictated by the dimension of the pores in the material, or induced by the presence of chiral ligands on the catalyst.

In addition to metal complexes, natural and modified aminoacids can also be chemically bound to porous supports, resulting in efficient catalysis of a wide range of reactions. The characterisation of the active sites, though, is made more difficult by the lack of appropriate techniques that clearly discriminate the catalytic species from the support.

In-depth coverage of the topic and future perspectives can be found here.

Design strategies for engineering selectivity in bio-inspired heterogeneous catalysts
David J. Xuereb and Robert Raja
Catal. Sci. Technol., 2011, Advance Article
DOI: 10.1039/C0CY00088D, Perspective

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Celebrating catalysis in Anaheim

RSCPublishing invites you to a reception to celebrate the publication of the first issue of Catalysis Science & Technology (publication due next week)!

The reception will be held in Anaheim, during the Spring National Meeting of the American Chemical Society:

6.00-8.00pm
Tuesday 29th March
Los Angeles / La Jolla Room
Marriott Hotel, Anaheim, USA

All are very welcome, to enjoy some refreshments and meet Catalysis Science & Technology Associate Editor, Paul Chirik (Princeton University).

Meet Associate Editor, Professor Paul Chirik

RSC Editors Robert Eagling (Chemical Communications, Chemical Science, Chemical Society Reviews), Janet Freshwater (RSC Books), Jamie Humphrey (Catalysis Science & Technology,
CrystEngComm, Dalton Transactions) and Sarah Ruthven (Annual Reports, Green Chemistry, Photochemical & Photobiological Sciences) will host the evening.

Contact Jamie Humphrey, Managing Editor, Catalysis Science & Technology, if you would like to attend.

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