An efficient ruthenium catalyst for selective hydrogenation of ortho-chloronitrobenzene prepared via assembling ruthenium and tin oxide nanoparticles

Zuo, Bin; Yuan, Wang; Wang, Qilong; Zhang, Junling; Wu, Nianzu; Peng, Lihong; Liu, Gui; Wang, Xiaodong; Wang, Rongming; Yu, Dapeng

doi:10.1016/j.jcat.2003.12.007

Cited by 114 publications

(30 citation statements)

References 27 publications

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“…The selectivity may depend on the support used; thus, simultaneous hydrogenation of the nitro group and hydrogenolysis of chlorine in p-CNB was reported for the reaction over a Pd/C catalyst, whereas on a Pd/polymer catalyst hydrogenolysis of chlorine was a subsequent reaction. [30] For ruthenium catalysts, the best selectivities (> 99 %) towards p-CAN have been obtained on alumina [4] or SnO 2 supports, [14] the other investigated supports such as silica [16] or MgF 2 [15] permitting to reach high selectivity (> 90 %). First, blank experiments using the CNT F and CNF F supports were performed to evaluate the catalytic performances of the unloaded supports; indeed the residual iron or nickel particles might became accessible after reduction at 300 8C and present some activity.…”

Section: Hydrogenation Of P-chloronitrobenzenementioning

confidence: 99%

“…Indeed, values of TOF ranging between 30 and 400 h À1 have been reported for ruthenium-containing catalysts operating between 60-100 8C and P H2 of 10 to 40 bars. [12,14,16] The increased activity obtained over nanostructured-carbonsupported ruthenium catalyst may have several explanations. First, the use of CNF or CNT supports, which present a very open structure permit to avoid diffusion limitations and maintain a high hydrogen flux at the catalyst surface and an easy access to the reaction sites.…”

Section: Hydrogenation Of P-chloronitrobenzenementioning

confidence: 99%

“…Selectivities between 92 and 94 % are systematically obtained, the major byproduct being aniline. either dedicated preparation of the catalysts (colloids, [9][10][11] bimetallic catalysis, [4,12,13] controlling the metal particle dispersion and metal-support interaction [14,15] ) or the use of specific additives such as water. [16] One of the most important aspects concerns the catalyst support.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogenation of p‐Chloronitrobenzene over Nanostructured‐Carbon‐Supported Ruthenium Catalysts

et al. 2011

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Carbon nanotubes (CNTs) and carbon nanofibers (CNFs) have been used for the first time to support ruthenium nanoparticles for the hydrogenation of p-chloronitrobenzene (p-CNB) to produce selectively p-chloroaniline. The preparation of well-dispersed ruthenium catalysts from the [Ru(3)(CO)(12)] precursor required activation of the purified supports by nitric acid oxidation. The supports, purified and functionalized, and the supported catalysts have been characterized by a range of techniques. The catalytic activity of these materials for the hydrogenation of p-CNB at 35 bar and 60 °C is shown to reach as high as 18 mol(p-CNB)g(Ru)(-1) h(-1), which is one order of magnitude higher than a commercial Ru/Al(2)O(3) catalyst. Selectivities between 92 and 94 % are systematically obtained, the major byproduct being aniline.

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Section: Hydrogenation Of P-chloronitrobenzenementioning

confidence: 99%

Section: Hydrogenation Of P-chloronitrobenzenementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrogenation of p‐Chloronitrobenzene over Nanostructured‐Carbon‐Supported Ruthenium Catalysts

et al. 2011

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“…Ru/C was found to be efficient in the selective partial hydrogenation of o-, m-and p-DNBs, and the selectivities to the corresponding NANs achieved over 95% [3]. Ru/SnO 2 exhibits high selectivity (99.9%) in the hydrogenation of o-chloronitrobenzene, but the reaction rate was very low with a TOF of 4.3 × 10 −2 s −1 [12]. The low activity was attributed to the high adsorption strength of the nitro group over Ru [13].…”

Section: Introductionmentioning

confidence: 99%

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

Cheng

Lin

et al. 2014

Catalysts

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Series catalysts of Ru-SnO x /Al 2 O 3 with varying SnO x loading of 0-3 wt% were prepared, and their catalytic activity and selectivity have been discussed and compared for the selective hydrogenation of m-dinitrobenzene (m-DNB) to m-nitroaniline (m-NAN). The Ru-SnO x /Al 2 O 3 catalysts were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and hydrogen temperature-programmed reduction (H 2 -TPR) and desorption (H 2 -TPD). Under the modification of SnO x , the reaction activity increased obviously, and the best selectivity to m-NAN reached above 97% at the complete conversion of m-DNB. With the increasing of the SnO x loading, the amount of active hydrogen adsorption on the surface of the catalyst increased according to the H 2 -TPD analysis, and the electron transferred from Ru to SnO x species, as determined by XPS, inducing an electron-deficient Ru, which is a benefit for the absorption of the nitro group. Therefore, the reaction rate and product selectivity were greatly enhanced. Moreover, the Ru-SnO x /Al 2 O 3 catalyst presented high stability: it could be recycled four times without any loss in activity and selectivity.

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“…These processes are associated with high pressure (40-150 bar) and temperature Aromatic haloamines, particularly p-chloroaniline (p-CAN), is an important class of industrial intermediates for the synthesis of organic fine chemicals, such as dyes, analgesic, herbicides, pesticides, and antipyretic drugs (279,280). For such hydrogenation reactions, various precious catalysts (Pt, Pd, Ru, and Rh) have been well-studied (279)(280)(281)(282)(283). However, it has been found that the hydrogenation process is accompanied by hydrogenolysis of the carbon-halogen bond over most of catalysts and that hydrogen halide (e.g., HCl) produced from this process is corrosive to the reactor in addition to their higher cost.…”

Section: Hydrogenationmentioning

confidence: 99%

Recent Advances in Metal Nanoparticles Stabilization into Nanopores of Montmorillonite and Their Catalytic Applications for Fine Chemicals Synthesis

2015

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Metal nanoparticles supported montmorillonite with innovative characteristics has led to a new generation of heterogeneous "nanocatalyst." Such catalysts are superior to the conventional catalysts because of several factors like: higher surface area; higher activity; higher selectivity and longer life and thus, developing a newer type of sustainable environmentally friendly catalysts. Metal clay supported nanocatalysts may find a wide range of applications in the area of fine and bulk chemical industries, pharmaceuticals, fuel cell, petroleum refineries, environmental catalysis, and many other fields. This article summarizes the recent advances in the synthesis and characterization of metal nanoparticles supported on modified montmorillonite and their catalytic applications for fine chemicals synthesis.

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An efficient ruthenium catalyst for selective hydrogenation of ortho-chloronitrobenzene prepared via assembling ruthenium and tin oxide nanoparticles

Cited by 114 publications

References 27 publications

Hydrogenation of p‐Chloronitrobenzene over Nanostructured‐Carbon‐Supported Ruthenium Catalysts

Hydrogenation of p‐Chloronitrobenzene over Nanostructured‐Carbon‐Supported Ruthenium Catalysts

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

Recent Advances in Metal Nanoparticles Stabilization into Nanopores of Montmorillonite and Their Catalytic Applications for Fine Chemicals Synthesis

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