By D. Astruc
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Extra info for Nanoparticles and Catalysts [Vol 1]
1 for the two major polymer formulas used for NP catalysis) [12k]. 1 Ring-opening hydrogenolysis of epoxides catalyzed by PdNPs (2 nm) microencapsulated in polyurea. Recycling experiments can be carried out at least ten times with 97–99% yield. (Ref. [14a], Yu group, Org. Lett. 2003, 4665). With standard PVP-stabilized NP catalysts, parameters such as size and stability during the catalytic process have been examined. For instance, decreasing the PdNP size down to 3 nm in the Suzuki reaction improved the catalytic activity, suggesting that the low-coordination number vertex and edge atoms on the particle surface are active catalytic sites .
Serendipitous discovery of the aerobic oxidation of CoNPs to Co oxide NPs led the author to investigate and generalize to many metal NP oxides the formation of the PtO2 NPs (Adams catalyst) from PtCl4 and a base in water in the presence of a stabilizer. This aspect concerning many mono- and di-metal NP oxides and their catalytic functions (chemical catalysis, electrocatalysis and corrosion) is the subject of the second part of Manfred Reetz’ Chapter 8. 12 Gold Nanoparticle-based Catalysts AuNPs occupy a special place given their great success and present developments.
Applications are expected in both the catalytic removal of CO produced at ambient temperature by engines and the removal of CO traces from dihydrogen streams feeding the fuel cells. There is a tremendous recent increase in the number of reports focusing on this area of supported AuNP-catalyzed CO oxidation, TiO2 becoming the dominant support . The ﬁeld of CO oxidation, including Masatake Haruta’ systems, recent advances and key mechanistic issues are reviewed by Catherine Louis in Chapter 15.