High activity in CO oxidation of Ag nanoparticles supported on fumed silica

CO Oxidation Activities of Ni and Pd-TiO2@SiO2Core-Shell Nanostructures

“…[4][5][6] The use of silica (SiO 2 ) spheres as an oxide support in the development of catalysts has attracted a great deal of attention in recent years. [7][8][9][10][11][12][13][14][15][16][17][18] For example, Yan et al prepared Co 3 O 4 nanoparticles in SiO 2 nanocapsules and found a 100% CO conversion rate at 150°C, 7 which was much better than that observed for other Co 3 O 4 nanostructures such as nanowires with exposed reactive {111} planes. Ni@SiO 2 , Co@SiO 2 and Fe@SiO 2 yolk-shell structures were prepared by Park et al and shown to be good for steam reforming of methane with high temperature stability and recyclability.…”

“…[13][14][15][16][17][18] In tests of the use of Ag/SiO 2 and Au/SiO 2 catalysts for CO oxidation, size and thermal pretreatment were shown to be important factors.…”

Formation of silver active states in Ag/ZSM-5 catalysts for CO oxidation

“…However, gold samples have some drawbacks preventing wide usage of Au catalysts; one of them is fast deactivation of the catalysts during performance or storage. At the same time some researchers reported high efficiency of silver-based catalyst due to their high stability and catalytic activity in the oxidation processes [4][5][6][7][8][9][10]. The activity of these catalysts depends on their surface structure, the method of catalyst preparation, the calcination temperature and other factors.…”

“…As a rule the active sites are considered as silver nanoparticles, but active ionic states are also discussed [4][5][6][7][8][9][10]. A question about the nature of active sites is one of key problem in catalysis.…”

Effect of silver nanoparticle on the properties of poly(methyl methacrylate) nanocomposite network made by in situ photoiniferter-mediated photopolymerization

“…Silver nanoparticles (AgNPs) are one of the most commonly used nanoparticles in this area, because of their antimicrobial activity as well as electrical conductivity and catalytic properties. [9][10][11][12][13] The AgNPs have shown antimicrobial effects against many microorganisms such as E. coli, Staphylococcus eureus, Staphylococcus epidermidis, * Author for correspondence (nikfarjam@iasbs.ac.ir) Candida albicans and Streptococcus mutans 11,[14][15][16] and very low toxicity against human and animals. 17,18 In medical appliance materials, in particular dental polymer materials, it is necessary for polymerization to be done with monomer conversion of ∼100% with trace residual monomer content.…”