NDLI: Unique adsorption and catalytic behavior of H$_{2}$ and CO over hollow Silica-Rh, -Ir, and -Ru nanocomposites prepared by Reversed Micelle Technique

Content Provider	Springer Nature Link
Author	Naito, Shuichi Mishima, Koji Miyao, Toshihiro
Copyright Year	2006
Abstract	Hollow silica nano spheres containing Rh, Ir or Ru metal particles were synthesized by Rh(NH$_{3}$)$_{6}$Cl$_{3}$ aq, Ir(NH$_{3}$)$_{3}$Cl$_{3}$ aq or Ru(NH$_{3}$)$_{6}$Cl$_{3}$ aq/NP-6/cyclohexane reversed micelle system. Hydrolysis of TEOS surrounding metal ammine complex crystals inside the micelle caused the formation of the hollow, which contained small metal particles inside and tiny metal clusters in the silica network. The amounts of H$_{2}$ adsorption over Rh and Ir nanocomposites were two to three times more in the cases of hollow-SiO$_{2}$ catalysts compared with those of non-hollow ones, suggesting the occlusion of hydrogen inside the hollows of Rh–SiO$_{2}$ or Ir–SiO$_{2}$. CO molecules could also permeate into the silica wall and be adsorbed on the metal clusters in the silica wall after 573 K pretreatment. Especially in the case of Ru nanocomposite the amount of adsorbed CO was much more than that of H$_{2}$, suggesting some unique character of Ru metal nanoparticles. After 773 K pretreatment, however, the amount of CO(a) decreased drastically to less than 1/10 of H(a), indicating the densification of Si–O–Si bonds and the formation of ultra-micropores in the silica wall where only H$_{2}$ can selectively permeate. Selective formation of methane was observed in the CO–H$_{2}$ reaction over these nanocomposite catalysts, provably because of the higher concentration of hydrogen inside the hollow and silica network.
Starting Page	131
Ending Page	136
Page Count	6
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	39
Issue Number	3-4
e-ISSN	15729028
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2006-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hollow silica H$_{2}$ adsorption CO adsorption nanocomposites Physical Chemistry Industrial Chemistry/Chemical Engineering Catalysis Characterization and Evaluation Materials Pharmacy
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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