Author
Alfons Baiker
Other affiliations: University of Vienna, Paul Scherrer Institute, University of Milan ...read more
Bio: Alfons Baiker is an academic researcher from ETH Zurich. The author has contributed to research in topics: Catalysis & Enantioselective synthesis. The author has an hindex of 83, co-authored 978 publications receiving 42903 citations. Previous affiliations of Alfons Baiker include University of Vienna & Paul Scherrer Institute.
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TL;DR: In this article, the steady state catalyst potential measurement during Pt metal catalyzed hydrogenation and oxidation reactions in slurry reactors has been reviewed and the experimental technique and possible applications of this in situ method is illustrated by many examples, including separation of consecutive reaction steps, determination of the oxidation state of platinum metal catalyst and promoter during reaction, elucidation of the role of surface impurities, and controlling the rate of alcohol oxidation by optimizing the surface concentration of the oxidizing species.
Abstract: The experimental technique and possible applications of the steady state catalyst potential measurement during Pt metal catalyzed hydrogenation and oxidation reactions in slurry reactors has been reviewed. The value of this in situ method is illustrated by many examples, including the separation of consecutive reaction steps, determination of the oxidation state of platinum metal catalyst and promoter during reaction, elucidation of the role of surface impurities, and controlling the rate of alcohol oxidation by optimizing the surface concentration of the oxidizing species.
TL;DR: In this paper, the authors aim at rationalizing the structure of enantiodifferentiating transition states of catalytic systems, aiming to move from empirical to rational design, and a few recent examples indicate the potential of such design strategy.
Abstract: Significant progress in the development of catalysts based on chirally modified metals, chiral polymers and heterogenized chiral metal complexes has been driven by experimental work to unravel the crucial properties of these complex catalytic systems. Experimental and theoretical studies aiming at rationalizing the structure of enantiodifferentiating transition states are indispensable to move from empirical to rational design. A few recent examples indicate the potential of such design strategy.
01 Jan 2008
TL;DR: In this article, the in situ monitoring of a solid catalyzed reaction by Raman spectroscopy in a packed bed Si/glass microreactor up to pressures of 10 MPa is reported.
Abstract: We report the in situ monitoring of a solid catalyzed reaction by Raman spectroscopy in a packed bed Si/glass microreactor up to pressures of 10 MPa. Reactant and product concentrations in the microreactor are analyzed during the hydrogenation of cyclohexene mediated by supercritical CO2 (scCO2) over Pd/Al2O3 catalyst. This study shows the novel opportunities in spectroscopic high pressure reaction profiling which can be performed directly on the presented microreactor. The fast temporal response on changes in flow rates, system pressure and reactor temperature makes the microreactor favorable for efficient optimization of reaction conditions and transient experiments.
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Journal Article•
28,685 citations
TL;DR: A review of gold nanoparticles can be found in this article, where the most stable metal nanoparticles, called gold colloids (AuNPs), have been used for catalysis and biology applications.
Abstract: Although gold is the subject of one of the most ancient themes of investigation in science, its renaissance now leads to an exponentially increasing number of publications, especially in the context of emerging nanoscience and nanotechnology with nanoparticles and self-assembled monolayers (SAMs). We will limit the present review to gold nanoparticles (AuNPs), also called gold colloids. AuNPs are the most stable metal nanoparticles, and they present fascinating aspects such as their assembly of multiple types involving materials science, the behavior of the individual particles, size-related electronic, magnetic and optical properties (quantum size effect), and their applications to catalysis and biology. Their promises are in these fields as well as in the bottom-up approach of nanotechnology, and they will be key materials and building block in the 21st century. Whereas the extraction of gold started in the 5th millennium B.C. near Varna (Bulgaria) and reached 10 tons per year in Egypt around 1200-1300 B.C. when the marvelous statue of Touthankamon was constructed, it is probable that “soluble” gold appeared around the 5th or 4th century B.C. in Egypt and China. In antiquity, materials were used in an ecological sense for both aesthetic and curative purposes. Colloidal gold was used to make ruby glass 293 Chem. Rev. 2004, 104, 293−346
11,752 citations
TL;DR: Metal-organic frameworks are porous materials that have potential for applications such as gas storage and separation, as well as catalysis, and methods are being developed for making nanocrystals and supercrystals of MOFs for their incorporation into devices.
Abstract: Crystalline metal-organic frameworks (MOFs) are formed by reticular synthesis, which creates strong bonds between inorganic and organic units. Careful selection of MOF constituents can yield crystals of ultrahigh porosity and high thermal and chemical stability. These characteristics allow the interior of MOFs to be chemically altered for use in gas separation, gas storage, and catalysis, among other applications. The precision commonly exercised in their chemical modification and the ability to expand their metrics without changing the underlying topology have not been achieved with other solids. MOFs whose chemical composition and shape of building units can be multiply varied within a particular structure already exist and may lead to materials that offer a synergistic combination of properties.
10,934 citations
9,432 citations
TL;DR: Titanium dioxide is the most investigated single-crystalline system in the surface science of metal oxides, and the literature on rutile (1.1) and anatase surfaces is reviewed in this paper.
7,056 citations