Advantage of carbon coverage over Al2O3 as support for Ni/C-Al2O3 catalyst in vapour phase hydrogenation of nitrobenzene to aniline

Velpula, Venkateshwarlu; Varkolu, Mohan; Rao, Madduluri Venkata; Peddinti, Nagaiah; Raju, B. David; Rao, K. Srinivasa

doi:10.1016/j.catcom.2016.07.026

Cited by 19 publications

(10 citation statements)

References 24 publications

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“…A similar mode of activation was proposed by Y. Wang and co-workers in the case of Co [Co(0) NPs onto nitrogen-doped carbon nanotubes] supporting it with DFT calculations . Later, K. S. R. Rao and co-workers also reported carbon-covered, Al 2 O 3 -supported Ni catalysts for the hydrogenation of nitrobenzene . Z. Zhao and co-workers reported a Ni system supported on W 2 C and activated carbon (AC), which hydrogenated nitrobenzene to aniline with a yield of 100% in the presence of Lewis acid .…”

Section: Heterogeneous Nickel-based Catalystssupporting

confidence: 68%

“…82 Later, K. S. R. Rao and co-workers also reported carbon-covered, Al 2 O 3 -supported Ni catalysts for the hydrogenation of nitrobenzene. 253 Z. Zhao and co-workers reported a Ni system supported on W 2 C and activated carbon (AC), which hydrogenated nitrobenzene to aniline with a yield of 100% in the presence of Lewis acid. 254 In the absence of Lewis acid, only 52% substrate was converted with the same catalyst, demonstrating the synergistic effect between Ni-W 2 C and the Lewis acid (in particular, FeCl 3 provided the best selectivity).…”

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confidence: 99%

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Reduction of Nitro Compounds Using 3d-Non-Noble Metal Catalysts

et al. 2018

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The reduction of nitro compounds to the corresponding amines is one of the most utilized catalytic processes in the fine and bulk chemical industry. The latest development of catalysts with cheap metals like Fe, Co, Ni and Cu has led to their tremendous achievements over the last years prompting to their greater application as "standard" catalysts. In this review we will comprehensively discuss the use of homogeneous and heterogeneous catalysts based on non-noble 3d-metals for the reduction of nitro compounds using various reductants. The different systems will be revised considering both the catalytic performances and synthetic aspects highlighting also their advantages and disadvantages.

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Section: Heterogeneous Nickel-based Catalystssupporting

confidence: 68%

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confidence: 99%

Reduction of Nitro Compounds Using 3d-Non-Noble Metal Catalysts

et al. 2018

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“…When Ni was loaded on the three different kinds of AC, the SSA and pore volume of all the catalysts decreased slightly. The decline of SSA for Ni/AC-3 is more significant than that for Ni/AC-1 and Ni/AC-2 because the AC support with a larger SSA made metallic Ni distributed uniformly. − Meanwhile, the results of CO-pulse chemisorption also demonstrated that Ni/AC-3 showed the highest Ni dispersion compared to Ni/AC-1 and Ni/AC-2.…”

Section: Resultsmentioning

confidence: 99%

Selective Cleavage of the Diphenyl Ether C–O Bond over a Ni Catalyst Supported on AC with Different Pore Structures and Hydrophilicities

et al. 2021

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Selective cleavage of C−O bonds in diphenyl ether (DPE), a lignin-derived 4-O-5 linkage, is a challenging topic and of great significance to produce value-added aromatic products for sustainable future. Activated carbon (AC) with different pore structures has different catalytic effects on the reaction. Herein, Ni catalysts supported on AC-1, AC-2, and AC-3 with specific surface area (SSA) values of 829, 1731, and 2399 m 2 /g, respectively, were investigated in the hydrogenolysis and hydrolysis of DPE. The proper pore structure of AC facilitates the entry of reactants and promotes the reaction. AC with a larger SSA and stronger hydrophilicity was more conducive to metal dispersion and water adsorption to promote the hydrogenolysis/hydrolysis of DPE. The apparent activation energy (E a ) and the turnover frequency further demonstrated that Ni/AC-3 possessed the highest catalytic activity compared to Ni/AC-2 and Ni/AC-1. Catalytic hydrogenolysis/hydrolysis of DPE can be therefore achieved over Ni/AC-3 under mild conditions (180 °C and 1 MPa H 2 ), which is highly selective to afford cyclohexane and cyclohexanol as the major products with the selectivities of 35.5 and 63.9%, respectively. The application of a hydrophilic Ni/AC catalyst with a high SSA may provide a promising approach for the valorization of lignin-derived fragments.

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“…28,29 Additionally, such shifts in TPR profiles have been observed in carbon-encapsulated metal oxide supports (e.g., Al 2 O 3 , ZrO 2 ) when active metals have been deposited. 30,31 For example, Ni on carbon-covered Al 2 O 3 showed a shift in peak hydrogen consumption from ∼250 to ∼400 °C, relative to Ni on AC, and better stability toward hydrogenation of nitrobenzene to aniline. 30 Carbon-encapsulated ZrO 2 deposited with Ru was shown to increase the metal support strength, minimizing Ru leaching in aqueous, acidic environments, while hydrogenating levulinic acid to γ-valerolactone.…”

Section: Resultsmentioning

confidence: 99%

“…30,31 For example, Ni on carbon-covered Al 2 O 3 showed a shift in peak hydrogen consumption from ∼250 to ∼400 °C, relative to Ni on AC, and better stability toward hydrogenation of nitrobenzene to aniline. 30 Carbon-encapsulated ZrO 2 deposited with Ru was shown to increase the metal support strength, minimizing Ru leaching in aqueous, acidic environments, while hydrogenating levulinic acid to γ-valerolactone. 31 Again, a shift to higher peak hydrogen consumption temperatures was observed for the Ru/carbon-encapsulated ZrO 2 versus Ru on AC.…”

Section: Resultsmentioning

confidence: 99%

Continuous Hydrogenation of Aqueous Furfural Using a Metal-Supported Activated Carbon Monolith

Pirmoradi

Janulaitis

Gulotty³

et al. 2020

ACS Omega

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Continuous hydrogenation of aqueous furfural (4.5%) was studied using a monolith form (ACM) of an activated carbon Pd catalyst (∼1.2% Pd). A sequential reaction pathway was observed, with ACM achieving high selectivity and space time yields (STYs) for furfuryl alcohol (∼25%, 60–70 g/L-cat/h, 7–15 1/h liquid hourly space velocity, LHSV), 2-methylfuran (∼25%, 45–50 g/L-cat/h, 7–15 1/h LHSV), and tetrahydrofurfuryl alcohol (∼20–60%, 10–50 g/L-cat/h, <7 1/h LHSV). ACM showed a low loss of activity and metal leaching over the course of the reactions and was not limited by H2 external mass transfer resistance. Acetic acid (1%) did not significantly affect furfural conversion and product yields using ACM, suggesting Pd/ACM’s potential for conversion of crude furfural. Limited metal leaching combined with high metal dispersion and H2 mass transfer rates in the composite carbon catalyst (ACM) provides possible advantages over granular and powdered forms in continuous processing.

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Advantage of carbon coverage over Al2O3 as support for Ni/C-Al2O3 catalyst in vapour phase hydrogenation of nitrobenzene to aniline

Cited by 19 publications

References 24 publications

Reduction of Nitro Compounds Using 3d-Non-Noble Metal Catalysts

Reduction of Nitro Compounds Using 3d-Non-Noble Metal Catalysts

Selective Cleavage of the Diphenyl Ether C–O Bond over a Ni Catalyst Supported on AC with Different Pore Structures and Hydrophilicities

Continuous Hydrogenation of Aqueous Furfural Using a Metal-Supported Activated Carbon Monolith

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