Advantage of Ni/SBA-15 catalyst over Ni/MgO catalyst in terms of catalyst stability due to release of water during nitrobenzene hydrogenation to aniline

Varkolu, Mohan; Pramod, Chodimella Venkata; Suresh, M.; Reddy, Kannapu Hari Prasad; Raju, B. David; Rao, K. Srinivasa

doi:10.1016/j.catcom.2011.11.030

Cited by 79 publications

(33 citation statements)

References 22 publications

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“…A similar observation was reported over 1 % Pd/MgO-Al 2 O 3 catalyst [40]. In our earlier publication, we reported the role of water over Ni/MgO catalyst on the NB hydrogenation activity [11]. It was reported in another publication [41] that higher NB conversion was observed when NB hydrogenation is coupled with 1-4 butanediol dehydrogenation over Cu/MgO catalysts at 250°C.…”

Section: Effect Of Time On Streamsupporting

confidence: 82%

“…The selectivity towards the aniline is always cent percentage over both the catalysts during the time on stream study. In our previous publication [11], we observed the catalytic performance of Ni/SBA-15 catalyst, during the time on stream for 10 h which remain constant due to hydrophobic nature of SBA-15, while in case of Ni/MgO catalyst, drastic decline in the catalytic performance of NB hydrogenation was observed due to the water adsorption on the MgO support. The adsorbed water may promote brucite-periclase transformation of MgO in case of MgOsupported Ni catalyst.…”

Section: Effect Of Time On Streammentioning

confidence: 79%

“…Recently, supported nickel catalysts were reported for various organic transformations such as hydrogenation [11][12][13], steam reforming reactions [14], reductive amination of alcohols [15], hydrodechlorination [16,17], partial oxidation [18] and dry reforming of methane [19]. Among, hydrogenation is of great interest to both industry and academia.…”

Section: Introductionmentioning

confidence: 99%

“…Details of all the above techniques and procedures have already been described in our previous publication [11][12][13]. The synthesized catalysts were digested in aqua regia and conducted AAS (M/s.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

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Nitrobenzene hydrogenation over Ni/TiO2 catalyst in vapour phase at atmospheric pressure: influence of preparation method

et al. 2015

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Highly dispersed nickel nanoparticles on supports such as ZrO 2 and TiO 2 were prepared by reductive deposition method using hydrazine as reducing agent and applied to nitrobenzene hydrogenation. The highlight of this work is to compare the characteristics and activity of these catalysts with the catalysts of the same composition prepared by impregnation method. All the catalysts were characterized by various techniques such as BET, H 2 pulse chemisorption, TEM, XRD (crystalline nature), reduction behaviour (TPR) and state of nickel species (XPS). Ni/ TiO 2 catalyst prepared by reductive deposition method shows excellent conversion of nitrobenzene (99 %) to aniline. This is due to the presence of higher number of surface Ni species than other catalysts as evidenced by H 2 -chemisorption. TPR results reveal the formation of metallic Ni species in the reductive deposition method. XRD results suggest that the all catalytic systems show peaks corresponding to the supports only and not due to the metallic Ni because of its presence in highly dispersed form. The decrease in catalytic performance is observed during the time on stream might be due to coking of the catalyst by the reaction intermediate.

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Section: Effect Of Time On Streamsupporting

confidence: 82%

Section: Effect Of Time On Streammentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Catalyst Characterizationmentioning

confidence: 99%

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Nitrobenzene hydrogenation over Ni/TiO2 catalyst in vapour phase at atmospheric pressure: influence of preparation method

et al. 2015

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“…The co-feeding of formic acid with levulinic acid (1:1 molar ratio) in an inert flow (N 2 flow 30 ml min −1 ) yielded 69% levulinic acid conversion with 45% GVL yield while with the co-feeding of water observed a complete LA conversion with 81% GVL yield. In our earlier publication [61], we have seen a similar observation with nitrobenzene-water mixture over an Ni/SBA-15 catalyst generating ~ 90% yield of aniline which indicated the robustness of SBA-15 as a support. As well, we noticed 22% yield of GVL with 37% levulinic acid conversion over 30 wt% Ni/ SiO 2 catalyst (1:1 molar ratio of levulinic acid and formic acid) [58].…”

Section: Effect Of Time-on-streamsupporting

confidence: 54%

Hydrogenation of levulinic acid with and without external hydrogen over Ni/SBA-15 catalyst

et al. 2018

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A series of Ni/SBA-15 catalysts were prepared by impregnation method for the hydrogenation of levulinic acid (LA) to γ-valerolactone in a fixed bed reactor at atmospheric pressure. The catalysts were characterized by XRD, TPR, AAS, Pulse chemisorption, SEM-EDAX, TEM, BET Surface area and XPS. The catalyst 30 wt% Ni/SBA-15 exhibited excellent catalytic performance (97% yield) at 250 °C due to the presence of superior number of active surface Ni species. While 30 wt% Ni/ SiO 2 catalyst showed lower catalytic activity (87% yield) at about similar conversion. The co-feeding of formic acid (FA) and water (impurities) with levulinic acid was also evaluated over 30 wt% Ni/SBA-15 which yielded excellent levulinic acid conversion. The noteworthy results were obtained at a molar ratio of FA/LA = 5. The constant catalytic activity during 10 h experiment with an external H 2 flow has showed the sturdiness of the Ni/SBA-15 catalyst. On the other hand, a slight decrease in conversion as well as yield during the time-on-stream in the absence of external H 2 flow was attributed to the accumulation of carbon species on the catalyst surface.

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Hydrogenation of Nitrobenzene over a Pd/Al₂O₃ Catalyst – Mechanism and Effect of the Main Operating Conditions

Couto¹,

Madeira

Nunes

et al. 2015

Chem Eng & Technol

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The catalytic hydrogenation of nitrobenzene (NB) was studied in a three-phase basket reactor with a commercial Pd/Al 2 O 3 sample as catalyst. The kinetic experiments allowed a better understanding of the mechanism behind the formation of aniline (ANL) and by-products, a topic not yet well comprehended. The effect of some operating conditions was studied and the existence of more by-products than mentioned in the literature was stated; specifically, benzene formation was verified. Both the reaction kinetics and selectivity were found to be strongly dependent on the temperature, while the effect of total pressure is not that pronounced. Moreover, the high selectivity of the catalyst used in the present work was proved, and as such the deep hydrogenation of ANL to form by-products only occurs in considerable extension when the NB concentration in the reaction mixture becomes negligible.

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Advantage of Ni/SBA-15 catalyst over Ni/MgO catalyst in terms of catalyst stability due to release of water during nitrobenzene hydrogenation to aniline

Cited by 79 publications

References 22 publications

Nitrobenzene hydrogenation over Ni/TiO2 catalyst in vapour phase at atmospheric pressure: influence of preparation method

Nitrobenzene hydrogenation over Ni/TiO2 catalyst in vapour phase at atmospheric pressure: influence of preparation method

Hydrogenation of levulinic acid with and without external hydrogen over Ni/SBA-15 catalyst

Hydrogenation of Nitrobenzene over a Pd/Al₂O₃ Catalyst – Mechanism and Effect of the Main Operating Conditions

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Advantage of Ni/SBA-15 catalyst over Ni/MgO catalyst in terms of catalyst stability due to release of water during nitrobenzene hydrogenation to aniline

Cited by 79 publications

References 22 publications

Nitrobenzene hydrogenation over Ni/TiO2 catalyst in vapour phase at atmospheric pressure: influence of preparation method

Nitrobenzene hydrogenation over Ni/TiO2 catalyst in vapour phase at atmospheric pressure: influence of preparation method

Hydrogenation of levulinic acid with and without external hydrogen over Ni/SBA-15 catalyst

Hydrogenation of Nitrobenzene over a Pd/Al2O3 Catalyst – Mechanism and Effect of the Main Operating Conditions

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Hydrogenation of Nitrobenzene over a Pd/Al₂O₃ Catalyst – Mechanism and Effect of the Main Operating Conditions