Effect of oxidant treatment of date pit active carbons used as Pd supports in catalytic hydrogenation of nitrobenzene

Bouchenafa-Saïb, N.; Grange, Paul; Verhasselt, P.; Addoun, Fatima; Dubois, Vincent

doi:10.1016/j.apcata.2005.02.022

Cited by 79 publications

(41 citation statements)

References 32 publications

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“…Platinum nanoparticle core-polyaryl ether trisacetic acid ammonium chloride dendimer shell nanocomposites were also employed for hydrogenation of nitrobenzene to aniline with molecular hydrogen under mild conditions [2]. Active carbons were used as supports for palladium in the liquid phase hydrogenation of nitrobenzene to aniline [3]. Hydrogenation of nitrobenzene was studied over Pt/C catalysts in supercritical carbon dioxide and ethanol [4].…”

Section: Introductionmentioning

confidence: 99%

Selective Hydrogenation of Nitrobenzene to Aniline over Ru/SBA-15 Catalysts

Chary

Srikanth

2008

Catal Lett

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A series of Ru/SBA-15 catalysts (0.5-6.0 wt%) are prepared by impregnation method. The catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), temperature programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS), CO-chemisorption, surface area and pore-size distribution measurements. The catalytic activities were evaluated for the vapor phase hydrogenation of nitrobenzene. The dispersion measured by CO-uptake values suggests decrease in dispersion with increasing Ru loading on SBA-15. These findings are well supported by the crystallite size measured from XRD and TEM measurements. XPS study reveals the formation of Ru0 after reduction at 573 K for 3 h. The catalysts exhibit high conversion/selectivity at 4.5 wt% Ru loading during hydrogenation reaction. The particle size measured from CO-chemisorption and TEM analysis related to the TOF during the hydrogenation reaction. Ru/SBA-15 catalysts are found to show higher conversion/ selectivities during hydrogenation of nitrobenzene than Ru/SiO 2 and Ru/Al 2 O 3 catalysts.

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Section: Introductionmentioning

confidence: 99%

Selective Hydrogenation of Nitrobenzene to Aniline over Ru/SBA-15 Catalysts

Chary

Srikanth

2008

Catal Lett

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“…When the catalyst was ready, nitrobenzene (2.5 mmol) was injected into the solution to start the reaction. During the reaction, the vessel was kept at 50 • C and 1 atm under reflux, very mild conditions as compared with those in the literature [3,18,[35][36][37]. Samples were taken every 20 min to analyze the conversion of nitrobenzene and concentration of reaction intermediates and products.…”

Section: Nitrobenzene Hydrogenationmentioning

confidence: 99%

“…The common industrial method for aniline production is through catalytic hydrogenation of nitrobenzene [1,2]. In the process, carbon supported noble metal catalysts are widely used [2][3][4][5][6][7][8][9][10]. However, improvement of the catalyst is limited by some obstacles.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of mesoporous γ-Fe2O3 supported palladium nanoparticles and investigation of their roles as magnetically recyclable catalysts for nitrobenzene hydrogenation

Jiang

Jafari

et al. 2015

Applied Catalysis A: General

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a b s t r a c tThe mesoporous ␥-Fe 2 O 3 (maghemite) supported palladium catalysts (written as Pd/meso-␥-Fe 2 O 3 ) are synthesized using impregnation and one-step sol-gel methods and characterized by PXRD, BET, TEM, EDX, and XPS. The synthesized Pd/meso-␥-Fe 2 O 3 catalysts are applied in nitrobenzene hydrogenation reactions under 50 • C and 1 atm and their catalytic activities are compared with Pd/comm-Fe 2 O 3 , Pd/meso-SiO 2 , and Pd/meso-C catalysts, in order to study the effect of the catalyst support. The TOF number of a 1% Pd/meso-␥-Fe 2 O 3 -im catalyst is highest among all the synthesized catalysts, attributed to the well dispersed Pd nanoparticles on the iron oxide support of large surface area, large pore size, and an interconnected network. All the mesoporous ␥-Fe 2 O 3 nanoparticle catalysts show characteristics of superparamagnetic behavior and thus can be easily retrieved by an external magnetic field. Significant catalyst activity decay is observed with 1% Pd/meso-␥-Fe 2 O 3 -im catalyst due to Pd leaching. However, improvement in activity of the recycled catalyst is observed when the one-step sol-gel synthesis method is used.

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“…In general, supports are used, since they allow obtaining a high specific surface area, lead to adequate porosity, provide appropriate acidity and/or basicity, and tolerate elevated temperatures without suffering significant degradation (high thermal conductivity); such characteristics directly affect the catalytic performance (activity, selectivity, and stability) on certain specific reactions [4][5][6][7][8]. The catalytic supports most commonly used in the chemical industry are based on activated carbon, zeolites, molecular sieves, clays, alumina, and/or silica, among others [9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Gelatin Template Synthesis of Aluminum Oxide and/or Silicon Oxide Containing Micro/Mesopores Using the Proteic Sol-Gel Method

Oliveira

Paulista

Alencar

et al. 2017

Journal of Nanomaterials

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Aluminum oxide and/or silicon oxide-based supports were synthesized by proteic sol-gel method. The characterization was performed through the analysis of TG, XRD, FTIR, SEM, and N 2 physisorption. The XRD diffractograms showed an amorphous material profile. TG results indicate the total liberation of the organic and inorganic material in the calcination temperature used, occurring in different mass loss range. This piece of information was reaffirmed by the FTIR spectra, which presented characteristic bands of gelatin structure before calcinations which disappear in the spectrum of the solid after calcinations, indicating the loss of organic matter from gelatin after heat treatment. The spectra exhibited M-O stretching vibration at low wavenumbers after calcinations related to metal oxides. The acquired images by SEM suggest the obtaining of a highly porous material with very different characteristics depending on the composition of the support. The N 2 isotherms indicate the presence of a micro/mesoporous oxide with interesting textural properties, particularly for the supports containing aluminum and silicon oxide. The ethanol dehydration results showed greater selectivity to diethyl ether compared to ethylene. From the reaction data, the following order of acid strength was obtained: 2Si-Al > Si-2Al > Si-Al > Al, which is related to the Si-Al ratio.

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Effect of oxidant treatment of date pit active carbons used as Pd supports in catalytic hydrogenation of nitrobenzene

Cited by 79 publications

References 32 publications

Selective Hydrogenation of Nitrobenzene to Aniline over Ru/SBA-15 Catalysts

Selective Hydrogenation of Nitrobenzene to Aniline over Ru/SBA-15 Catalysts

Synthesis of mesoporous γ-Fe2O3 supported palladium nanoparticles and investigation of their roles as magnetically recyclable catalysts for nitrobenzene hydrogenation

Gelatin Template Synthesis of Aluminum Oxide and/or Silicon Oxide Containing Micro/Mesopores Using the Proteic Sol-Gel Method

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