Kim, HS Seo, SH Lee, H Lee, SD Kwon, YS Lee, IM 2024-01-21T17:02:18Z 2024-01-21T17:02:18Z 2021-09-03 1998-06-15 1381-1169 https://pubs.kist.re.kr/handle/201004/143000 The influences of added alkali metal nitrates and nitrites on the performances of ruthenium catalysts in the liquid phase ring hydrogenation of 4,4'-methylenedianiline (MDA) and 1,4-phenylenediamine (PDA) have been examined. Sodium nitrate and sodium nitrile were shown to be the most effective promoters in enhancing the catalytic activity and in suppressing the formation of by-products. The effects of various solvents and the added water on the hydrogenation activity have also been investigated. The promoting effects of sodium nitrate and sodium nitrite were considerably enhanced in the presence of small amounts of water. XRD patterns of the Ru/Al2O3 catalyst sample obtained from the reaction performed in the presence of NaNO3 or NaNO2 revealed that the sodium aluminate (NaAlO2) phase appears indicating that the cations of metal salts are interacting with the supporting material. An active species, NaOCH(CH3)(2), was isolated and identified by spectroscopic and elemental analyses. (C) 1998 Elsevier Science B.V. All rights reserved. English ELSEVIER SCIENCE BV Ru-catalyzed hydrogenation of aromatic diamines: The effect of alkali metal salts Article 10.1016/S1381-1169(97)00246-X 1 JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, v.132, no.2-3, pp.267 - 276 JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL 132 2-3 267 276 scie scopus 000074430600014 2-s2.0-0344835839 Chemistry, Physical Chemistry Article hydrogenation aromatic diamine alkali metal salt