Selective hydrogenation of m-dinitrobenzene to m-nitroaniline catalyzed by PVP-Ru/Al2O3

Gas Phase Hydrogenation of m-Dinitrobenzene over Alumina Supported Au and Au–Ni Alloy

“…The available published data dealing with the selective hydrogenation of m-DNB are very limited and we could not find any report that has demonstrated the exclusive formation of m-NAN. It is, nevertheless, worth flagging work conducted at high hydrogen pressures (10-45 atm) in the gas phase over Pt/C under supercritical CO 2 (P CO 2 ¼ 150 atm) [31] and in the liquid phase using Pd/C [32] and polylvinylpyrrolidone stabilized Ru/Al 2 O 3 [33] where m-NAN selectivities in excess of 80% have been recorded.…”

Selective Hydrogenation of m-Dinitrobenzene to m-Nitroaniline over Ru-SnOx/Al2O3 Catalyst

“…Both of these two methods are hazardous, tedious and costly, with further separation and waste disposal. From environmental and economic points of view, catalytic, selective hydrogenation of m-DNB directly to m-NAN should be an attractive process, and it has attracted much attention in recent years [1][2][3]. However, controlling the product selectivity is particularly a challenge in the hydrogenation of m-DNB in terms of the exclusive formation of m-NAN (partial reduction product), due to it being easily hydrogenated to the complete reduction product of m-phenylenediamine (m-PDA) [4,5] and the formation and accumulation of intermediates, such as phenylhydroxylamine (PHA), azoxy-benzene (AOB), azo-benzene (AB) and hydrazo-benzene (HAB), as illustrated in Scheme 1.…”

“…Recently, PVP-Ru/Al 2 O 3 was discovered to be an effective catalyst for the partial hydrogenation of m-DNB to m-NAN with almost 100% selectivity at the conversion of m-DNB of <95%, and the addition of a metal cation, such as Fe 3+ or Sn 4+ , could markedly enhance the reaction rate and retain the high selectivity of m-NAN. The interaction between metal species may change the electronic density of the catalytic active site, thus affecting the adsorption state of the substrate on the catalyst surface [2]. Doping a second element to the supported transition metal catalysts is considered to be an efficient means, and a widely used one, to adjust the catalytic performance.…”

Study on the influence of substituents upon the hydrogenation of nitrobenzene using a polymer-supported palladium-imidazole complex catalyst

“…Hydrogenation of p-nitrobenzoic acid was carried out using 30 ml of various solvents with [p-Nitrobenzoic acid] = 33.3 9 10 -3 mol dm -3 , [Catalyst] = 5.92 9 10 -3 mol dm -3 Pd at 30°C and the results are listed in the Table 1. The results indicated that the polar solvents are more favorable than non-polar solvents and methanol is the most suitable among the solvents studied [20,21].…”