The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform

Gabor A Somorjai - One of the best experts on this subject based on the ideXlab platform.

  • Metallic Nanoparticles in Heterogeneous Catalysis
    Catalysis Letters, 2021
    Co-Authors: András Sápi, T. Rajkumar, János Kiss, Ákos Kukovecz, Zoltán Kónya, Gabor A Somorjai
    Abstract:

    Heterogeneous Catalysis is a chemical process achieved at solid–gas or solid–liquid interfaces. Many factors including the particle size, shape and metal-support interfaces can have significant influences on the catalytic properties of metal catalysts. The recent progress in the synthesis techniques and advanced characterization tools allow to understand the catalytic mechanisms at molecular level. In this Review, the size and shape dependent catalytic chemistry of metal nanoparticles and their electronic properties will be discussed. Then the unique catalytic chemistry at the metal-support interfaces will be discussed in details. Furthermore, the challenges of bimetallic nanoparticle catalytic chemistry will be discussed. Graphic Abstract

  • Reaction Selectivity in Heterogeneous Catalysis
    Lawrence Berkeley National Laboratory, 2010
    Co-Authors: Gabor A Somorjai
    Abstract:

    Reaction Selectivity in Heterogeneous Catalysis Gabor A. Somorjai* and Christopher J. Kliewer Department of Chemistry, University of California, Berkeley, California 94720, and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 E-mail: somorjai@socrates.berkeley.edu TITLE RUNNING HEAD: Selectivity in Heterogeneous Catalysis CORRESPONDING AUTHOR FOOTNOTE: Gabor A. Somorjai, Tel: 510-642-4053. Fax: 510- 643-9668. E-mail: somorjai@socrates.berkeley.edu. Review for Reaction Kinetics and Catalysis Letters

  • Reaction selectivity in Heterogeneous Catalysis
    Reaction Kinetics and Catalysis Letters, 2009
    Co-Authors: Gabor A Somorjai, Christopher J. Kliewer
    Abstract:

    The understanding of selectivity in Heterogeneous Catalysis is of paramount importance to our society today. In this review we outline the current state of the art in research on selectivity in Heterogeneous Catalysis. Current in-situ surface science techniques have revealed several important features of catalytic selectivity. Sum frequency generation vibrational spectroscopy has shown us the importance of understanding the reaction intermediates and mechanism of a Heterogeneous reaction, and can readily yield information as to the effect of temperature, pressure, catalyst geometry, surface promoters, and catalyst composition on the reaction mechanism. DFT calculations are quickly approaching the ability to assist in the interpretation of observed surface spectra, thereby making surface spectroscopy an even more powerful tool. HP-STM has revealed three vitally important parameters in Heterogeneous selectivity: adsorbate mobility, catalyst mobility and selective site-blocking. The development of size controlled nanoparticles from 0.8 to 10 nm, of controlled shape, and of controlled bimetallic composition has revealed several important variables for catalytic selectivity. Lastly, DFT calculations may be paving the way to guiding the composition choice for multi-metallic Heterogeneous Catalysis for the intelligent design of catalysts incorporating the many factors of selectivity we have learned.

  • Conversion of Heterogeneous Catalysis from art to science: the surface science of Heterogeneous Catalysis
    Journal of Molecular Catalysis A-chemical, 1998
    Co-Authors: Peter W. Jacobs, Gabor A Somorjai
    Abstract:

    Direct combination of high pressure reaction studies with molecular level surface characterization of model catalysts has made possible the development of concepts to describe and to explain phenomena that occur during Heterogeneous Catalysis. These phenomena include structure sensitivity, surface reconstruction, inert chemisorbed overlayers present under reaction conditions, and interaction between the metal and the oxide support. The catalytic behavior of model systems and the roles of their different components have been investigated and explained in terms of some of these concepts.

Atsushi Fukuoka - One of the best experts on this subject based on the ideXlab platform.

  • Conversion of lignocellulose into renewable chemicals by Heterogeneous Catalysis
    Catalysis Science & Technology, 2012
    Co-Authors: Hirokazu Kobayashi, Hidetoshi Ohta, Atsushi Fukuoka
    Abstract:

    Conversion of lignocellulose into renewable chemicals and fuels has received great attention for building up sustainable societies. However, the utilisation of lignocellulose in the chemical industry has largely been limited to paper manufacturing because of the complicated chemical structure and persistent property of lignocellulose. Heterogeneous Catalysis has the potential to selectively convert lignocellulosic biomass into various useful chemicals, and this methodology has rapidly progressed in the last several years. In this perspective article, we outline our recent approaches on the Heterogeneous Catalysis for this challenging subject with related literatures.

  • Cellulose conversion under Heterogeneous Catalysis.
    ChemSusChem, 2008
    Co-Authors: Paresh L. Dhepe, Atsushi Fukuoka
    Abstract:

    In view of current problems such as global warming, high oil prices, food crisis, stricter environmental laws, and other geopolitical scenarios surrounding the use of fossil feedstocks and edible resources, the efficient conversion of cellulose, a non-food biomass, into energy, fuels, and chemicals has received much attention. The application of Heterogeneous Catalysis could allow researchers to develop environmentally benign processes that lead to selective formation of value-added products from cellulose under relatively mild conditions. This Minireview gives insight into the importance of biomass utilization, the current status of cellulose conversion, and further transformation of the primary products obtained.

David Farrusseng - One of the best experts on this subject based on the ideXlab platform.

  • High-throughput Heterogeneous Catalysis
    Surface Science Reports, 2008
    Co-Authors: David Farrusseng
    Abstract:

    Abstract This comprehensive review of the literature (over 250 references) deals with high-throughput experimentation in Heterogeneous Catalysis. Approaches to library design for catalyst discovery and optimization are described and discussed. Special focus is placed on advanced methods for knowledge discovery such as high-throughput kinetic modeling and QSAR. An inventory of successful case studies in Catalysis is reported. Finally, recent developments in relevant electronic data and knowledge management are described.

  • High-throughput Heterogeneous Catalysis
    Surface Science Reports, 2008
    Co-Authors: David Farrusseng
    Abstract:

    This comprehensive review of the literature (over 250 references) deals with high-throughput experimentation in Heterogeneous Catalysis. Approaches to library design for catalyst discovery and optimization are described and discussed. Special focus is placed on advanced methods for knowledge discovery such as high-throughput kinetic modeling and QSAR. An inventory of successful case studies in Catalysis is reported. Finally, recent developments in relevant electronic data and knowledge management are described. (C) 2008 Published by Elsevier B.V.

Götz Veser - One of the best experts on this subject based on the ideXlab platform.

  • Stabilizing metal nanoparticles for Heterogeneous Catalysis
    Physical Chemistry Chemical Physics, 2010
    Co-Authors: An-min Cao, Götz Veser
    Abstract:

    Metal nanoparticles hold great promise for Heterogeneous Catalysis due to their high dispersion, large concentration of highly undercoordinated surface sites, and the presence of quantum confinement effects, which can drastically alter their reactivity. However, the poor thermal stability of nano-sized particles limits their use to low temperature conditions and constitutes one of the key hurdles towards industrial application. The present perspective paper briefly reviews the mechanisms underlying nanoparticle sintering, and then gives an overview of emerging approaches towards stabilizing metal nanoparticles for Heterogeneous Catalysis. We conclude by highlighting the current needs for further developments in the field.

James A. Dumesic - One of the best experts on this subject based on the ideXlab platform.

  • Handbook of Heterogeneous Catalysis - Principles of Heterogeneous Catalysis
    Handbook of Heterogeneous Catalysis, 2008
    Co-Authors: James A. Dumesic, George W. Huber, M. Boudart
    Abstract:

    The sections in this article are Introduction Definitions of Catalysis and Turnover Steps in a Heterogeneous Catalytic Reaction Desired Characteristics of a Catalyst Reaction Schemes and Adsorbed Species Conditions for Catalyst Optimality Catalyst Design Catalyst Development Bridging Gaps in Heterogeneous Catalysis A Philosophical Note Keywords: Heterogeneous Catalysis; green chemistry; fuel cells

  • Applications of Adsorption Microcalorimetry to the Study of Heterogeneous Catalysis
    Advances in Catalysis, 1992
    Co-Authors: Nelson Cardona-martínez, James A. Dumesic
    Abstract:

    Publisher Summary This chapter presents a survey of the theoretical and applied aspects of microcalorimetry to Heterogeneous Catalysis with particular emphasis on the determination of the acid–base properties of metal oxides and mixed metal oxides. Heterogeneous Catalysis involves specific chemical interactions between the surface of a solid and the reacting gas (or liquid phase) molecules. The catalytic cycle is generally composed of adsorption steps, surface reaction processes, and desorption steps. The energetics of these surface chemical events plays an important role in determining the catalytic properties of the surface. Thus, the study of the adsorption of probe and reactive gas molecules onto surfaces is of primary importance in Catalysis. The key to the effective utilization of microcalorimetry in Heterogeneous Catalysis is the judicious choice of gas-phase molecules for study.