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Postma RS, Brunet Espinosa R, Lefferts L. Competitive Adsorption of Nitrite and Hydrogen on Palladium during Nitrite Hydrogenation. ChemCatChem 2018; 10:3770-3776. [PMID: 30263084 PMCID: PMC6146939 DOI: 10.1002/cctc.201800523] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Indexed: 12/03/2022]
Abstract
Nitrite hydrogenation is studied in steady-state as well as transient operation using a Pd catalyst in a tubular membrane contactor reactor. A negative reaction order in hydrogen in steady state operation proofs that hydrogen and nitrite adsorb competitively. In transient operation, feeding nitrite to the Pd surface fully covered with hydrogen results initially in very low conversion of nitrite, speeding up once hydrogen is removed from part of the Pd surface. Additional proof for competitive adsorption between hydrogen and nitrite is provided by the observation that exposure of a nitrite-covered catalyst to hydrogen induces desorption of nitrite. Formation of ammonia in these experiments proceeds via two pathways, first via a fast reaction followed by extremely slow hydrogenation of adsorbed N atoms, which is kinetically not relevant. This information is relevant for designing effective and selective catalysts when operating at very low nitrite concentration.
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Affiliation(s)
- Rolf Sybren Postma
- Catalytic Processes and Materials group Faculty of Science and Technology MESA+ Institute for NanotechnologyUniversity of TwentePO Box 2177500 AEEnschedeThe Netherlands
| | - Roger Brunet Espinosa
- Catalytic Processes and Materials group Faculty of Science and Technology MESA+ Institute for NanotechnologyUniversity of TwentePO Box 2177500 AEEnschedeThe Netherlands
- Present address: Beele EngineeringBeunkdijk 117122 NZAaltenThe Netherlands
| | - Leon Lefferts
- Catalytic Processes and Materials group Faculty of Science and Technology MESA+ Institute for NanotechnologyUniversity of TwentePO Box 2177500 AEEnschedeThe Netherlands
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Takaishi K, Muranaka A, Kawamoto M, Uchiyama M. Photoinversion of Cisoid/Transoid Binaphthyls. Org Lett 2011; 14:276-9. [DOI: 10.1021/ol203053q] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Kazuto Takaishi
- RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan, Japan Science and Technology Agency (JST), PRESTO, Kawaguchi 332-0012, Japan, and Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Atsuya Muranaka
- RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan, Japan Science and Technology Agency (JST), PRESTO, Kawaguchi 332-0012, Japan, and Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masuki Kawamoto
- RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan, Japan Science and Technology Agency (JST), PRESTO, Kawaguchi 332-0012, Japan, and Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masanobu Uchiyama
- RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan, Japan Science and Technology Agency (JST), PRESTO, Kawaguchi 332-0012, Japan, and Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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