A recipient of the Donald W. The higher activity is attributed to considerable leaching of the active metal ions from the framework, while the titanium-containing materials are quite stable under the reaction conditions. Arends was born in the Netherlands in 1966 and studied chemistry at the University of Leiden The Netherlands where she received her Ph. To check the reusability of the mesoporous aluminophosphate catalysts, recy- cling and washing experiments were normally carried out. The final chapter examines the latest industrial applications, such as the production of catechol and hydroquinone, cyclohexanone oxime, and propylene oxide. Liquid Phase Oxidation via Heterogeneous Catalysis features contributions from an international team of leading chemists representing both industry and academia.
Reprinted with permis- sion from Ref. In this section, we cover briefly the various methods employed for characterization of these materials. Therefore, attempts were made for the synthesis of molecular sieves with much larger meso pore dimensions. Copyright 2001 American Chemical Society. Postdoctoral work followed with K. These results can rule out any contribution to the observed catalysis from the tungsten species that leached into the reaction solution, and the observed catalysis is truly heterogeneous in nature.
Before going into details about the catalysts ability, we briefly discuss the synthesis methodology of both microporous and mesoporous alu- minophosphates and their characterization. Kholdeeva, Boreskov Institute of Catalysis, Novosibirsk, Russia. The catalyst can also be recycled without much loss in activity, and the framework structure remains intact throughout the process. Furthermore, the catalyst was reusable without the loss of the catalytic performance. Clerici holds more than forty patents. More advanced synthesis procedures have to be developed that selectively increases the amount of framework transition-metal ions in the matrix. His research interests are mainly concerned with the application of catalytic methods, in particular catalytic oxidations using homogeneous, heterogeneous and biocatalysts, in organic synthesis.
In the absence of tem- plates, no crystalline phase forms. Reproduced with permission from Ref. PhD students will draw inspiration from this book, both for the preparation of new or modified catalytic materials and for applications in the selective oxy-functionalization of organic substrates, while more experienced researchers will benefit from the opportunity to read a comprehensive and comparative analysis of the relevant literature. The quadrupole nutation spectrum helps in orientation of sample, which enables identification of different kinds of tetrahedral species in aluminophosphate molecular sieves. Copyright 2001 American Chemical Society.
Reproduced with permission from Ref. Martin Wallau is Post-Doc at the State University of Campinas, Brazil. For example, the aluminophosphate framework is neutral in contrast to the negatively charged aluminosilicates. Although they show promising results, a better understanding of their framework textural properties, active sites and their interaction with guest molecules needs to be addressed. The conversion of 4-picoline into isonicotnic acid was achieved up to 70% with a remarkable selectivity of 90%. The activity also decreased with recycling, with a considerable amount of cobalt leached into the reaction mixture Table 3.
Energy and Fuels 18, 12661271. In: The Role of Oxygen in Chemistry and Biochemistry. Following a postdoctoral stay at the Max-Planck-Institut für Kohlenforschung in Mülheim, Germany, he joined the Department of Inorganic Chemistry at the State University in Campinas. Such a method of preparation of zeo-type materials is referred to as ionothermal synthesis. A summary of the channel systems and ring structures along with the structure codes is presented in Table 3. Preface xi Contributors xiii Abbreviations xv 1 Environmentally Benign Oxidants 1 Giorgio Strukul and Alessandro Scarso 1.
The E-mail message field is required. This chapter also covers the regenerabil- ity of the catalysts as well as the leaching of metal ions from framework structure. The proposed reaction pathway is shown in Scheme 3. The higher activity of the former may be explained based on the synergistic effect of the different metal ions present in the microporous matrix. Description: 1 online resource Contents: Liquid Phase Oxidation via Heterogeneous Catalysis: Organic Synthesis And Industrial Applications; Contents; Preface; Contributors; Abbreviations; 1 Environmentally Benign Oxidants; 1.
It fully examines the synthesis, characterization, and application of catalytic materials for environmentally friendly organic syntheses. Following a postdoctoral sojourn with Jay Kochi he was with Shell Research, Amsterdam, from 1969 to 1980. The remarkable diversity in structure and porosity offers broader adsorptive and catalytic applicability. However, apart from the temperature and time, the type of structure formed depends on the control of a number of variables, including the reactant gel composition, the type of templates, the individual characteristics of reactants, pH, etc. PhD students will draw inspiration from this book, both for the preparation of new or modified catalytic materials and for applications in the selective oxy-functionalization of organic substrates, while more experienced researchers will benefit from the opportunity to read a comprehensive and comparative analysis of the relevant literature.