ID 111076
Title Alternative
Reductive Decomposition of Nitrite in a Continuous-Flow Reactor Using Fixed-Bed Structured Pd Catalysts
Author
Fukushima, Naozumi Tokushima University
Tsuchiya, Yuto Tokushima University
Hayashi, Yukimi Nippon Pillar Packing
Arai, Yuka Nippon Pillar Packing
Akamatsu, Masamori Nippon Pillar Packing
Keywords
Reductive decomposition
Nitrite
Palladium
Structured catalyst
Structural Catalyst
Content Type
Journal Article
Description
In order to decompose trace amounts of nitrite in drinking water under mild conditions, a fixed-bed filtering system that used structural catalysts was employed to filter recycled aqueous nitrite. High performance and continuous mass processing are generally accepted as requirements to catalyze the decomposition of aqueous nitrite. However, the use of a fixed-bed operation when recycling aqueous nitrite with palladium catalyst systems could result in either negligible activity when using a carbon monolith impregnated with Pd, or could stop the flow by enhancing the pressure drop when using non-porous alumina spheres coated with Pd/C or structured catalysts consisting of a polyurethane sponge skeleton impregnated with Pd. In the present paper, a Si/SiC ceramic filter was employed as a structured support to prevent pressure drop. When palladium was loaded onto the surface of the filter via electroless plating, continuous flow suitably continued, and the conversion of nitrite was 45% after 60 min. In contrast, when palladium was loaded after the coating of the filter with alumina, complete decomposition was achieved after 60 min under conditions corresponding to those used for the former system. X-ray diffraction, an N2 adsorption-desorption measurement, scanning-electron microscopy and energy-dispersive X-ray spectroscopy analyses revealed that a higher dispersion of palladium on the latter structured catalyst resulted in the greatest level of activity for the reductive decomposition of aqueous nitrite.
Journal Title
Journal of Chemical Engineering of Japan
ISSN
00219592
NCID
AA00709658
AA12022538
Publisher
The Society of Chemical Engineers, Japan
Volume
51
Issue
1
Start Page
83
End Page
88
Published Date
2018-01-20
Rights
Copyright © 2018 The Society of Chemical Engineers, Japan
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
eng
TextVersion
Author
departments
Science and Technology