Chemical Society's Catalysis Volume 11: A Review of Recent Literature (A PDF

By Chemical Society

ISBN-10: 0851866549

ISBN-13: 9780851866543

There's an expanding problem for chemical and learn associations to discover least expensive and environmentally sound tools of changing ordinary assets into fuels chemical substances and effort. Catalysts are necessary to those tactics and the Catalysis professional Periodical record sequence serves to focus on significant advancements during this sector. This sequence presents systematic and designated experiences of themes of curiosity to scientists and engineers within the catalysis box. The insurance comprises all significant parts of heterogeneous and homogeneous catalysis and likewise particular functions of catalysis comparable to NOx keep watch over kinetics and experimental recommendations equivalent to microcalorimetry. each one bankruptcy is compiled through well-known specialists inside their expert fields and gives a precis of the present literature. professional Periodical experiences offer systematic and exact overview insurance in significant components of chemical examine. Compiled via groups of top specialists of their professional fields, this sequence is designed to assist the chemistry neighborhood continue present with the newest advancements of their box. every one quantity within the sequence is released both every year or biennially and is a wonderful reference aspect for researchers.

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Extra info for Catalysis Volume 11: A Review of Recent Literature (A Specialist Periodical Report)

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Data from Reference 44. Imaging SIMS studies may be of great importance in studies of catalyst deactivation, as trace amounts of contaminations can be detected along with their position with respect to the catalyst particles. For catalysts with small particles, the maximum obtainable lateral resolution of imaging SIMS of about 50 nm may not be sufficient. However, imaging SIMS has found some interesting applications in the study of metal deposition onto fluid catalytic cracking (FCC)catalysts, used for conversion of heavy hydrocarbon fractions into lighter These catalysts contain particles with a typical size in the range of 50 to Applications of Secondary Ion Mass Spectrometry in Catalysis and Surface Chemistry 27 150 pm, which consist of zeolite and clay phases, held together by a silica-alumina binder.

Calcination increases the moiybdena dispersion. (b) The SlMS intensity ratio MoO'/Mo' for the same catalysts indicates increased oxygen coordination of molybdenum upon calcination. Data from Reference 30. Mo-species. Oxygen-containing Mo clusters are most intense for the calcined catalyst, possibly due to a higher 0-coordination of the Mo centers. SIMS experiments on Mo/Al,O, catalysts3' result in spectra similar to those for Mo/Si02 catalysts. For this system, calcination-rehydration treatments have no significant influence on the SIMS intensity ratios, indicating that eventual changes in the structure of Mo species are not accompanied by an increasing Mo dispersion, in agreement with X P S measurements.

SIMS spectra of these catalysts show intense V+ and VO' signals, but cluster ions comprising both Ru and V are not observed. Striking is the presence of RuO' ions, which are absent in the spectra of both the unpromoted catalyst and a physical mixture of vanadium oxide and the unpromoted catalyst. An explanation is that Ru and vanadium oxide are present close enough in the promoted catalyst to enable recombination of separately sputtered Ru and oxygen atoms from vanadium oxide, whereas this secondary ion formation mechanism does not occur when Ru and vanadium oxide are present far apart in separate phases.

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Catalysis Volume 11: A Review of Recent Literature (A Specialist Periodical Report) by Chemical Society

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