Interview: Cynthia Friend, co-Editor-in-Chief of Catalysis Science & Technology

Professor Cynthia Friend talks about her passion for catalysis and her work in meeting the challenges of energy production…

Why did you choose to work in the area of catalysis?
Catalysis fascinated me because it is based on kinetic control of reaction product distributions. Initially, I was attracted to the challenge of using reaction mechanisms to understand how to use kinetics to obtain desired products. Heterogeneous catalysis was particularly interesting to me because of the added complexity of interfaces, emerging tools for studying interfaces, and the parallels with homogeneous catalysis and coordination chemistry. The importance of catalysis in meeting the challenges in energy production and in the development of green chemical processes have led to a surge of interest in catalysis and an amplification of my interest in the field.

What projects are you working on at the moment?
My laboratory is working on major projects: Fundamental studies of coinage metal catalysts, with an emphasis on the use of Au-based catalysis as a route to energy-efficient complex oxidative transformations; and, photochemical and chemical processes on metal oxides and sulfides for solar energy conversion. In both of
these projects we study model systems using surface chemistry

What achievement are you most proud of?
In science, I am most proud of helping to develop the careers of young scientists in my lab and to watch them branch out into many areas.

What would you say is the biggest challenge in your field of catalysis at the moment?
The biggest challenge is to understand how to control materials properties at the molecular and mesoscale level to promote specific reactions efficiently. Energy-efficient production of clean-burning fuels is of broad importance and a major challenge.

Welcome to the Catalysis Science & Technology Editorial Board! What excites you most about your new position of co-Editor-in-Chief?
The opportunity to help shape a new RSC journal in this important field is an exciting venture. We have the opportunity to showcase important work across the diverse range of catalysis— heterogeneous, homogeneous and biological. I am excited about the possibility of integrating concepts across these fields.

The first articles for Catalysis Science & Technology are now appearing online, which is very exciting, have any of the articles particularly caught your eye?
I have found two articles to be particularly interesting:
1.  “Dynamic atomic scale in situ electron microscopy in the development of an efficient heterogeneous catalytic process for pharmaceutical NSAIDS” by P.L. Gai, etal. DOI: 10.1039/c0cy00063a.
This article shows how new and emerging tools using transmission electron microscopy (TEM) are providing new insights into the structure and associated function of complex metal oxide catalysts.
2. “Rapid synthesis of nanostructured Cu–TiO2–SiO2 composites for CO2 photoreduction by evaporation driven self-­assembly” by P. Biswas etal., DOI: 10.1039/c0cy00091d.
This article also used TEM and also investigated composite oxides with Cu as a possible catalyst for CO2 reduction to CO.

What advice would you give to a young scientist?
My advice is to follow your instincts and to enjoy yourself in the process of pursuing your work. To be a successful scientist, you need to be creative, patient and  persistent.

What would you do if you weren’t a scientist?
This is a difficult question because it is hard for me to imagine doing anything else—I truly love my work. I do have other interests that I might pursue more vigorously if I were not a scientist. I enjoy writing and I also am very involved in sports. At a younger age and in a different era, I might have become a professional golfer. I still play competitively and love enjoying the outdoors.

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Lights on denitrification

The population of Earth is rising day by day, forcing agriculture to boost its production through the use of GM crops, the exploitment of new plant species for human consumption and, more traditionally, by employing increasingly large amounts of fertilizers (see the EFMA  EU trend here).

Most of the commonly used fertilizers are sources of phosphate and nitrate ions that if used constantly can percolate through soil and contaminate groundwater and eventually affect the quality of drinking water.

Following the WHO guidelines reviewed in 2003, the maximum limit of nitrate in drinking water is set at 5omg/Litre and a maximum of 3mg/L for nitrite for short term exposure. The main consequences of exposure to higher doses of nitrate and nitrite are methaemoglobinaemia (conversion of hameoglobulin into methaemoglobulin, unable to carry oxygen) and morphological changes in the adrenal glands, lungs and heart (in animal models).

Ion exchange and chlorination, two common water denitrification processes are unable to efficiently remove nitrite due to its solubility and other processes produce a number of undesired toxic products like nitrite and ammonia.

Mishra et al., in a study presented in Catalysis Science and Technology proposed a preliminary but encouraging process to photocatalitically convert nitrate in nitrogen gas with minimal production of side-products.

In the first application in this field, tungsten and nitrogen doped titania was used in association with formic acid (a hole scavenger that increase the rate of reduction) for the reduction of nitrate with visible light produced by a high pressure Hg vapour lamp. After several studies on the ideal combination of doping agents and manufacturing conditions, the group found that a 2% of tungsten yielded the most active form of the catalyst (although larger percentages of the metal increased the absorption in the visible region).

Testing of the material for activity unveiled a selectivity for nitrogen gas of around 95% in contrast with just 50% obtained when tungsten wasn`t incorporated into the catalyst. To mimic potential real-life application, the tests were performed in air and also in the presence of chloride anions, the effect of which appeared to be overall beneficial to the reaction.

A discussion of the factors determining the activity of the system pointed out the importance of the exact combination of doping, hole scavenger, morphology of the material, mesoporosity and the presence of hydroxyl groups on the surface.

The characteristics of the material could make it a good candidate for a solar light-powered version of the process.

Mesoporous WN co-doped titania nanomaterial with enhanced photocatalytic aqueous nitrate removal activity under visible light
T. Mishra, M. Mahato, Noor Aman, J. N. Patel and R. K. Sahu
Catal. Sci. Technol., 2011, Advance Article
DOI: 10.1039/C1CY00042J, Paper

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Perspective: MOFs as heterogeneous oxidation catalysts

In this Catalysis Science & Technology perspective, Hermenegildo Garcia and colleagues from the Polytechnic University of Valencia describe the use of MOFs as heterogeneous catalysts for oxidation reactions using hydroperoxides or molecular oxygen.

The authors predict that the field of MOFs as solid catalysts will grow enormously in the near future due to the easy design and synthesis of chiral MOFs.

Read more:

Metal–organic frameworks as heterogeneous catalysts for oxidation reactions
Amarajothi Dhakshinamoorthy, Mercedes Alvaro and Hermenegildo Garcia
Catal. Sci. Technol., 2011, Advance Article
DOI: 10.1039/C1CY00068C, Perspective

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Catalysis Science & Technology Poster Prize Winner at the British Zeolite Association Conference

Catalysis Science & Technology was proud to sponsor one of the poster session at the recent 34th Annual British Zeolite Association Conference in Edinburgh.

The Catalysis Science & Technology poster prize was awarded to Zhao Chao from the University of Birmingham, for a poster entitled “Hydrothermal Synthesis and Ion Exchange Properties of New Zinc Phosphonate Materials”

Read more about the British Zeolite Association, or find out more about the research happening in the Department of Chemistry at the University of Birmingham…

Read more about zeolites in these recently published Catalysis Science & Technology articles:

Catalytic activity and extra-large pores of germanosilicate UTL zeolite demonstrated with decane test reaction
Nataliia Kasian, Gina Vanbutsele, Kristof Houthoofd, Tamas I. Koranyi, Johan A. Martens and Christine E. A. Kirschhock

Aluminium atomic layer deposition applied to mesoporous zeolites for acid catalytic activity enhancement
Sreeprasanth Pulinthanathu Sree, Jolien Dendooven, Tamás I. Korányi, Gina Vanbutsele, Kristof Houthoofd, Davy Deduytsche, Christophe Detavernier and Johan A. Martens

Two-dimensional zeolites: dream or reality?

Wieslaw J. Roth and Jiří Čejka

Stoichiometric formation of benzene and ketones by photocatalytic dechlorination of chlorobenzene in secondary alcohol suspensions of palladium-loaded titanium(IV) oxide powder in the presence of sodium ion sources
Kojirou Fuku, Keiji Hashimoto and Hiroshi Kominami

CoAPO-5-type molecular sieve membrane: synthesis, characterization and catalytic performance
Manickam Sasidharan, Yoshimichi Kiyozumi and Asim Bhaumik

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Super-acid supports improve SCR efficiency

Nitrogen oxides are among the most harmful pollutants produced by the combustion of fossil fuels, cause of euthropication of waters and soil contamination.

The reduction of  the release of these nitrogen oxides from industrial flue gases and diesel engines into the atmosphere is more than ever a hot topic, as testified by the increasing amount of scientific publications  on NOx storage and disposal; some of which appeared in Catalysis Science and Technology last month (here and here, also reviewed in this blog).

One of the main strategies to convert these oxides into harmless product is the Selective Catalytic Reduction (SCR) that takes place on supported catalysts like those found in exhausts pipes of modern cars. Due to the presence of alkaline metals in biomass derived and fossil fuels that can poison and deactivate them , though, the activity of these catalysts decreases with time; metals like potassium and barium affect the Brønsted acid sites of the catalysts and prevent the ammonia adsorbtion process, essential in the functioning of the system.

A new study by the Danish research group lead by Rasmus Fehrmann addresses this weakness and proposes a possible improvement to the process; the group postulated that in the presence of a super-acidic support for the catalyst, the alkali would preferentially react with the support, leaving the catalytic species untouched.

The super-acid of choice was a member of the heteropoly acids family, a class of solid acids composed of  clusters of hydrogen, oxigen and  transition metals coordinated around elements of the p-block like silicon, phosphorus or arsenic.

The chosen heteropoly acids, among which the 12-tungstophoshporic acid (TPA), were added to the titanium oxide support in conjunction with V2O6 as the active catalyst and tested in the NH3 promoted SCR. Traditional V2O6/TiO2 and mixed V2O6-WO3/TiO2 catalysts were used as a reference during the activity tests.

After doping with a source of potassium, the catalysts were tested against their pristine counterparts to measure the difference in activity, resulting in a superior performance of the super-acid supports which retained up to 88% of the original activity compared to 33% of the untreated ones.

Find out about these promising catalysts here.

Heteropoly acid promoted V2O5/TiO2 catalysts for NO abatement with ammonia in alkali containing flue gases
Siva Sankar Reddy Putluru, Anker Degn Jensen, Anders Riisager and Rasmus Fehrmann
Catal. Sci. Technol., 2011, Advance Article

DOI: 10.1039/C1CY00081K, Paper

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Top Ten most-read Catalysis Science & Technology articles in March

Read the most-read Catalysis Science & Technology articles of March 2011, listed below: 

Kalluri V. S. Ranganath and Frank Glorius, Catal. Sci. Technol., 2011, 1, 13-22
DOI: 10.1039/C0CY00069H
 
Barbara Pawelec, Rufino M. Navarro, José Miguel Campos-Martin and José L. G. Fierro, Catal. Sci. Technol., 2011, 1, 23-42
DOI: 10.1039/C0CY00049C
 
Hu Li, Bi-Jie Li and Zhang-Jie Shi, Catal. Sci. Technol., 2011, 1, 191-206
DOI: 10.1039/C0CY00076K
 
Wieslaw J. Roth and Jiří Čejka, Catal. Sci. Technol., 2011, 1, 43-53
DOI: 10.1039/C0CY00027B
  
Dmitry Yu. Murzin, Catal. Sci. Technol., 2011, Advance Article
DOI: 10.1039/C0CY00084A
 
Zhichun Si, Duan Weng, Xiaodong Wu, Yang Jiang and Bin Wang, Catal. Sci. Technol., 2011, Advance Article
DOI: 10.1039/C0CY00086H
 
Lin Jiang and Ying-Chun Chen, Catal. Sci. Technol., 2011, Advance Article
DOI: 10.1039/C0CY00096E
 
Mazaahir Kidwai, Saurav Bhardwaj, Neeraj Kumar Mishra, Arti Jain, Ajeet Kumar and Subho Mozzumdar, Catal. Sci. Technol., 2011, Advance Article
DOI: 10.1039/C0CY00060D
 
Matthew D. Jones, Callum G. Keir, Carlo Di Iulio, Ruth A. M. Robertson, Cliff V. Williams and David C. Apperley, Catal. Sci. Technol., 2011, 1, 267-272
DOI: 10.1039/C0CY00081G
 
David J. Xuereb and Robert Raja, Catal. Sci. Technol., 2011, Advance Article
DOI: 10.1039/C0CY00088D
 
To keep up-to-date with all the best research articles, sign up for the journal’s e-alerts here
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Happy Easter from Catalysis Science & Technology

Catalysis Science & Technology is celebrating Easter by highlighting all recently published review articles.

Thank you to all our authors and referees who have made Catalysis Science & Technology such a success since its launch last year.

A review of NOx storage/reduction catalysts: mechanism, materials and degradation studies
Gang Liu and Pu-Xian Gao

Selectivity via catalyst or substrate control in catalytic asymmetric transformations of bifunctional symmetrical substrates
David S. Glueck

Design strategies for engineering selectivity in bio-inspired heterogeneous catalysts

David J. Xuereb and Robert Raja

Recent advances in asymmetric catalysis with cinchona alkaloid-based primary amines
Lin Jiang and Ying-Chun Chen

Deactivation and regeneration of wet air oxidation catalysts
Sylvain Keav, Jacques Barbier and Daniel Duprez

Non-covalent immobilization of asymmetric organocatalysts
Long Zhang, Sanzhong Luo and Jin-Pei Cheng

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

Nanokinetics for nanocatalysis
Dmitry Yu. Murzin

Unique catalytic features of Ag nanoclusters for selective NOx reduction and green chemical reactions
Kenichi Shimizu, Kyoichi Sawabe and Atsushi Satsuma

A review of the development of nitrogen-modified carbon-based catalysts for oxygen reduction at USC
Gang Liu, Xuguang Li, Jong-Won Lee and Branko N. Popov

Challenge and progress: palladium-catalyzed sp3 C–H activation
Hu Li, Bi-Jie Li and Zhang-Jie Shi

Carbene insertion into transition metal–carbon bonds: a new tool for catalytic C–C bond formation
Nicole M. G. Franssen, Annemarie J. C. Walters, Joost N. H. Reek and Bas de Bruin

Well-defined copper(I) complexes for Click azide–alkyne cycloaddition reactions: one Click beyond
Silvia Díez-González

Heterogeneous catalysis of the glycerol hydrogenolysis
Yoshinao Nakagawa and Keiichi Tomishige

Join these authors and submit your work now!

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Meet the team: 17th Rideal Conference

Dr Jamie Humphrey, Managing Editor of Catalysis Science & Technology will be attending the 17th Rideal Conference, hosted by the Cardiff Catalysis Institute in the Cardiff School of Chemistry between April 19th 2011 and April 21st 2011.

Professor Cynthia Friend, our co-Editor-in-Chief, will also be there, as a keynote speaker.

If you are attending please get in touch, Jamie will be delighted to speak to you.

To find out more about the Rideal conference visit their website:

http://www.rideal.cf.ac.uk/index.html

Find out what other conferences members of the Editorial Offices will be attending.

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Tackling pollution; one car at a time. NOx Storage/Reduction catalysts.

While waiting for the golden age of green energy and sustainable, environmentally friendly fuels to arrive, chemical research is focusing on efficient methods to contain the damage caused by the exploitation of fossil fuels. One important issue is reducing the dangerous emissions of automotive and industrial exhausts, which contribute to the production of highly polluting volatile nitrogen oxides.

The review by Liu and Gao, just published in Catalysis Science & Technology explores in detail the NOx storage/reduction process (NSR), one of the three common disposal techniques for nitrogen oxides together with direct decomposition and selective catalytic reduction (SCR). Among these, the direct decomposition suffers from an high activation energy, the SCR process is best suited for stationary sources and very large engines, while NSR was designed for small car engines.

The NSR process works in a stepwise fashion; first the NOx are trapped in the storage component of the NSR catalyst during the lean-burn cycle (high air-to-fuel ratio) to be successively released during the rich burn cycle (low air-to-fuel ratio) and reduced to N2 on the catalyst by hydrocarbons hydrogen and CO produced in the rich cycle. The common catalyst for NSR is generally composed of precious metals, storage components and support metal oxides (Pt/BaO/Al2O3).

In this Minireview a comprehensive description of the mechanisms in operation in each step is presented in detail, together with an explanation of the role of each component and the advantages of different materials and supports.

To know more about the workings of these catalysts, click here.

A review of NOx storage/reduction catalysts: mechanism, materials and degradation studies
Gang Liu and Pu-Xian Gao
Catal. Sci. Technol., 2011, Advance Article
DOI: 10.1039/C1CY00007A, Minireview

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Fast-tracked acceptance for Scopus!

Catalysis Science & Technology given must-have status, accepted for Scopus

Last week we heard some exciting news in the Catalysis Science & Technology Editorial Office.

Our new journal has been accepted for indexing in Scopus, outside of the regular evaluation procedures, because it was considered as a “must-have” for the Scopus database.  Our contact at Scopus tells us that in some exceptional cases  journals receive this priority treatment.

The very positive endorsement comes just as we are about to publish online the second issue of the journal – keep a look out for it, or sign up for the journal’s e-alerts.

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