Preparation and characterization of chlorine-free ruthenium catalysts and the promoter effect in ammonia synthesis. 1. An alumina-supported ruthenium catalyst

Journal Article · Wed Jul 01 00:00:00 EDT 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90110-4· OSTI ID:7252962

Murata, Shuzo; Aika, Ken-ichi ^[1]

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1. Tokyo Inst. of Technology, Yokohama (Japan)

Ru/Al{sub 2}O{sub 3} catalyst prepared from Cl-free Ru carbonyl was much more active for ammonia synthesis under 1.01 bar of N{sub 2} + 3H{sub 2} than that prepared from RuCl{sub 3}. The high activity was related to the high dispersion and lack of Cl. Alkali metal ion (oxide or hydroxide of Cs{sup +}, Rb{sup +}, and K{sup +}) was an effective promoter for the Cl-free Ru catalyst, suggesting that the alkali acted as an electronic promoter for Ru. The synthesis rate was maximum when the Cs/Ru ratio was as high as 10. Alkali had a strong interaction with the Al{sub 2}O{sub 3} surface and a weak interaction with the Ru surface.

• OSTI ID: 7252962
• Journal Information: Journal of Catalysis; (United States), Vol. 136:1; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
10 SYNTHETIC FUELS
AMMONIA
SYNTHESIS
CESIUM
CATALYTIC EFFECTS
RUBIDIUM
RUTHENIUM
ALUMINIUM OXIDES
CARBONYLS
CATALYST SUPPORTS
CATALYSTS
CESIUM HYDROXIDES
CESIUM OXIDES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHLORINE
CONFIGURATION INTERACTION
HYDROGEN
NITROGEN
POTASSIUM HYDROXIDES
POTASSIUM OXIDES
PROMOTERS
RUBIDIUM HYDROXIDES
RUBIDIUM OXIDES
RUTHENIUM CHLORIDES
RUTHENIUM COMPOUNDS
ALKALI METAL COMPOUNDS
ALKALI METALS
ALUMINIUM COMPOUNDS
CESIUM COMPOUNDS
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HALOGENS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROXIDES
KINETICS
METALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
POTASSIUM COMPOUNDS
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
RUBIDIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
100200 - Synthetic Fuels- Production- (1990-)