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Vol.7 No.1previous AASP14 (87-88-89-90-91-92-93-94-95-96-97-

Academic Articles
Regular Paper Vol.7 No.1 (2015) p.84 - p.89

Development of New Type Passive Autocatalytic Recombiner - Part1. Characterization of Monolithic Catalyst

Yu KAMIJI1, Masashi TANIGUCHI2, Yasuo NISHIHATA3, Ryuji NAGAISHI1, Hirohisa TANAKA2, Shingo HIRATA1,4, Mikiya HARA1, Ryutaro HINO1

1 Nuclear Engineering Research Collaboration Center, Japan Atomic Energy Agency (JAEA), 4002 Narita-cho, Oarai-town, Higashi-ibaraki-gun, Ibaraki 311-1393, Japan
2 Daihatsu Motor Co., Ltd., 3000 Ohaza Yamanoue, Ryuo-cho, Gamo-gun, Shiga 520-2593, Japan
3 Quantum Beam Science Center, Japan Atomic Energy Agency (JAEA), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
4 Kawasaki Heavy Industries, Ltd., 1-14-5 Kaigan, Minato-ku, Tokyo 105-8315, Japan


For hydrogen mitigation, a new type passive autocatalytic recombiner has been developed, as one of safety accident managements at a nuclear power plant. This new recombiner has an automotive monolithic substrate catalyst in order to reduce weight and to improve hydrogen treating capacity, environmental resistance, and product quality. The activation energy has been experimentally estimated at 5.75 kJ/mol with stoichiometric composition gas flow. The fed hydrogen and oxygen to the monolithic catalyst were immediately recombined in both the dry and the humid atmospheres. Moreover, it has been found that gamma-ray irradiation up to 1.0 MGy could promote catalytic activity, because the specific area of the catalyst and the surface area of the precious metals increased. In addition, no significant difference was observed in the compositional distribution in the monolithic catalyst by EPMA. As the result, an automotive monolithic catalyst is applicable to practical installation of PAR into NPPs.

Note: "Development of New Type Passive Autocatalytic Recombiner- Part2. Proposal of Conceptual Structure" appears here

Passive autocatalytic recombine, hydrogen mitigation, Characterization, Monolithic catalyst, irradiation
Full Paper: PDF EJAM Vol.7No.1 pp.84-89 "Development of New Type Passive Autocatalytic Recombiner - Part1. Characterization of Monolithic Catalyst"
Article Information
Article history:
Received 26 November 2014
Accepted 13 March 2015