Pervasiveness of Surface Metal Oxide Phases In Mixed Oxide Catalysts
Israel E. Wachs
Lehigh University, Bethlehem, PA
Abstract — Mixed oxide catalytic materials possess two or more metal oxide components as found in bulk mixed metal oxides (stoichiometric oxides as well as solid solutions), polyoxo metalates (POMs), molecular sieves, zeolites, clays, hydrotalcites and supported metal oxides. Although it is now well established that two-dimensional surface metal oxide phases are present for supported metal oxides on traditional supports (e.g., Al2O3, TiO2, ZrO2, SiO2, etc.), it is not currently appreciated that such surface metal oxide species or phases are also present for other types of mixed oxides. For example, recent surface analyses have demonstrated that stoichiometric bulk mixed metal oxides also possess surface metal oxide phases that control their catalytic activity. For example, the catalytic active sites for methanol oxidation to formaldehyde over the bulk Fe2(MoO4)3 mixed oxide catalyst are surface MoOx species and not the bulk Fe2(MoO4)3 phase as previously thought in the catalysis literature. The nanometer sized clusters in POMs also possess surface species when a second metal oxide component is introduced (e.g., H3+xPW12-xMxO40). Deposition of metal oxides into molecular sieves, zeolites, clays and hydrotalcites also results in the metal oxide additive usually being present as surface metal oxide species that are the catalytic active sites for many redox and acid reactions. The formation of these surface metal oxide phases is driven by their low surface free energy and low Tammann temperature for many metal oxides of interest in catalysis (e.g., VOx, MoOx, CrOx, ReOx, WOx, etc.).
(An Award presented jointly by the North American Catalysis Society and the European Federation of Catalysis Societies)
The Michel Boudart Award for the Advancement of Catalysis is sponsored by the Haldor Topsøe Company, and is administered jointly by the North American Catalysis Society and the European Federation of Catalysis Societies. The Award will be presented biennially in odd numbered years. The recipient will give plenary lectures at the biannual meetings of the North American Catalysis Society (NAM) and the European Federation of Catalysis Societies (EFCATS) (EuropaCat). The award consists of a plaque or object of art and a prize of $6,000. Up to an additional $2,000 will be made available for otherwise non-reimbursed travel expenses.
The Award recognizes and encourages individual contributions to the elucidation of the mechanism and active sites involved in catalytic phenomena and to the development of new methods or concepts that advance the understanding and/or practice of heterogeneous catalysis. The Award selection process will emphasize accomplishments and contributions published within the five preceding years. Candidates may be nominated without any restriction of national origin, thus reflecting the international scope of the career and contributions of Michel Boudart.
The recipient of the Michel Boudart Award will be selected by a committee of renowned researchers appointed jointly by the Presidents of the North American Catalysis Society and the European Federation of Catalysis Societies. The selection shall be made without regard for age, sex, affiliation, or national origin. Recipients of NACS Awards or Lectureships within the last 5 years are eligible for the Michel Boudart Award.
Nominations should clearly state the qualifications and accomplishments of the nominee and should also include a CV and no more than two supporting letters. A critical evaluation of the significance of publications and patents should be made, as well as a statement of the particular contribution(s) on which the nomination is based. Each nomination is to be submitted as one complete package (nomination letter, CV, 2 supporting letters, and justification).
After September 2012, one complete electronic copy of the nomination packages for the 2013 Boudart Award should be sent to the President of The North American Catalysis Society (Enrique Iglesia; iglesia@berkeley.edu) or the President of The European Federation of Catalysis Societies (Avelino Corma; acorma@itq.upv.es) by 1 November 2012. Nominators should expect to receive email confirmation of their submission.
The F.G. Ciapetta Lectureship in Catalysis is sponsored by the Grace Davison operating segment of W.R. Grace & Co. and The North American Catalysis Society. The Society administers this Lectureship. It is to be awarded biennially in even numbered years. The Award consists of a plaque and an honorarium of $5,000. Travel expenses are provided through a travel escrow fund, administered by the NACS, to be used on a “as needed basis” for the recipients from academia or industrial companies (with $100 Million annual sales; up to $3,000. for employees of larger companies).
The Award is given in recognition of substantial contributions to one or more areas in the field of catalysis with emphasis on industrially significant catalysts and catalytic processes and the discovery of new catalytic reactions and systems of potential industrial importance. The awardee will be selected on the basis of his/her contributions to the catalytic literature and the current timeliness of these research contributions. The recipient may be invited to visit and lecture to each of the affiliated Clubs/Societies with which mutually satisfactory arrangements can be made.
Selection of the awardee will be made without regard to age, sex, nationality, or affiliation. The nomination should contain a critical evaluation of the significance of candidate’s qualifications should be made as well as a statement of the particular contribution(s) on which the nomination is based. Nomination documents (nomination letter, CV, justification, and no more than 2 seconding letters) in one complete package should be submitted electronically to the President of the Society. Nominations for the Ciapetta Award will close on 1 November 2013. All nomination packages for the Ciapetta Award should be should be sent to Enrique Iglesia, President, North American Catalysis Society; at iglesia@berkeley.edu. Receipt of any nomination, will be confirmed by an email message sent to any nominator.
TBA
Website: www.nam23.org
Meeting registration and poster setup will start at 8:30 am.
Website: Northeast Corridor Zeolite Association
2012 NECZA Announcement
List of Poster Abstracts
Supported Metal Catalysts — Issues and Opportunities
Stuart Soled, ExxonMobil
Oxidative Dehydrogenation of Ethane to Ethylene
Anne M. Gaffney, AMG Catalysis and Chemistry Consulting, LLC
Download announcement
.
Program
Sulfur-Resistant Pd– Alloy Membranes for H2 Purification
Jim Miller, Carnegie Mellon University
Nature of Catalytic Active Surface Sites on Semiconductor Photocatalysts for Splitting of Water
Somphonh Peter Phivilay, Lehigh University (Student Speaker)
TBA
John Kitchin, Carnegie Mellon
Meeting Program — April 2013
John Kitchin
Department of Chemical Engineering,
Carnegie Mellon University
Abstract — Electrochemical water splitting may be in integral part of future energy storage strategies by enabling energy storage in chemical bonds. One of the primary sources of inefficiency in the water splitting reaction is the oxygen evolution reaction, which has high reaction barriers that require additional applied electric potential to drive the reactions at practical rates. The most active electrode materials in acid electrolytes include ruthenium and iridium oxides, which are expensive but necessary for stability. In alkaline environments, many base metal oxides become stable, although they are still less active than Ru and Ir oxides. It has been known that small amounts of Fe can promote the electrochemical activity of nickel oxides, making it almost as active as cobalt oxide. We have investigated the mechanisms behind the promotion using in situ Raman and synchrotron spectroscopies as well as ex situ characterization techniques. Interestingly, we found the electrode changes under oxygen evolution conditions, turning from an oxide to an oxyhydroxide phase. Furthermore, the composition of the electrolyte has a significant effect on the oxygen evolution activity. We will discuss these results and their implications in finding better oxygen evolution electrocatalysts.
Each year the Catalysis Club of Philadelphia recognizes an outstanding member of the catalysis community, who has made significant contributions to the advancement of Catalysis. Such advancement can be scientific, technological, or in organization leadership. The Award consists of a plaque and a $1000 cash prize.
We appreciate your help in submitting nominations. The entire nomination package, including a resume and recommendation letters, should not be more than 10 pages and should include a ½ page tentative award announcement. The deadline for the receipt of nominations is April 19, 2013. Prior nomination packages sent in 2011 or later will automatically be considered for the 2013 Award.
Nomination letter along with supporting materials should be emailed to fedeyjm@jmusa.com.
Joseph Fedeyko
Johnson Matthey ECT
436 Devon Park Drive
Wayne, PA 19087
Tel. 610–341‑8218
Fax 610–341‑3495
