Kinetics of 10% Pd/C-catalysed hydrogenolysis of chlorobenzene dissolved in n-heptane by gaseous hydrogen in contact with aqueous NaOH or water

Janiak, Tadeusz; Błażejowski, Jerzy

doi:10.1016/j.apcata.2004.02.050

Cited by 15 publications

(4 citation statements)

References 44 publications

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“…When NaOH or ammonium formate was used, the yield was low (entry 4, 7). However, the higher yield was obtained with Sodium Carbonate (Na2CO3), Sodium bicarbonate (NaHCO 3 ), triethylamine (Et 3 N) (entry 1,5,6). We also used ammonium acetate in this system, and obtained the highest yiled (entry 3).…”

Section: The Effects Of Different Basementioning

confidence: 99%

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Synthesis of 3-tert-butylaniline by Using Hydrodechlorination Technology

2014

AMR

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Catalytic hydrodechlorination (HDC) is an innovative means of transforming chlorinated waste streams into a recyclable product. Hydrodehalogenation of 4-tert-butyl-1-chloro-2-nitrobenzene over Raney nickel catalyst has been investigated. The influence of different parameters, such as reaction solution, bases type, temperature and pressure are explored. Using Raney nickel as catalyst, methanol and water (v: v=4:1) as the reaction solution, ammonium acetate as the addictive, the ratio of ammonium acetate and 4-tert-butyl-1-chloro-2-nitrobenzene is 1:1, temperature 140 °C and pressure 3.0 Mpa, the highest efficiency can be achieved on hydride-chlorination of 4-tert-butyl-1-chloro-2-nitrobenzene. We find that a rather high catalytic activity can be retained by adding water.

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Section: The Effects Of Different Basementioning

confidence: 99%

“…Therefore, the study of effective removal of chlorinated organic compounds is urgent. Catalytic hydrodechlorination technology has been widely studied over the last decades, and it is one of the most promising methods for disposal of environmentally hazardous organ chlorine pollutants [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of 3-tert-butylaniline by Using Hydrodechlorination Technology

2014

AMR

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“…Metal compounds based on Rh [3,4], Pt [5,7], Pd [4,[6][7][8][9][10][11][12][13][14][15][16] and Ni [7,14,[17][18][19][20][21][22] have been used as catalysts for hydrodechlorination of halogenated organic compounds. However, and to the best of our knowledge, little work has been published regarding the use of copper compounds as a catalyst system for hydrodechlorination of chlorobenzene and organic halides.…”

Section: Introductionmentioning

confidence: 99%

Kinetics Study of the Hydrodechlorination of Chlorobenzene Catalyzed by Immobilized Copper Complexes

et al. 2005

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The hydrodechlorination of chlorobenzene to benzene and biphenyl was studied using poly(4-vinylpyridine)-immobilized Cu catalysts under CO in basic (NaOH, N(C 2 H 5 ) 3 or Na(CH 3 CO 2 )) aqueous 2-ethoxyethanol medium. This Cu system also catalyzed the water gas shift reaction. The catalytic activities for hydrodechlorination of chlorobenzene to benzene were studied as functions of the reaction parameters (nature of the base, reaction time, [Cu], P(CO), T, and S/C). Among the different base studied activity is maximum for NaOH. The rate of benzene formation displays a first-order dependence on [Cu] over the range 1.25-12.50 wt%. This observation was interpreted in terms of the presence of active species having the same nuclearity. The catalytic activity towards benzene formation proved to be first order dependence on P(CO) over the range 5-35 atm. The kinetics behavior with respect to P(CO) leads to the proposal that CO addition to the catalytic species precedes the rate-limiting step. The catalytic activity proved to be non-linear in chlorobenzene/Cu content, over the range 50-400 molar ratio. The results suggest that the rate-limiting step is preceded by reversible oxidative addition of chlorobenzene to Cu immobilized species.

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“…Na reação de hidrodesalogenação de compostos orgânicos em fase heterogênea, os principais catalisadores utilizados têm sido metais suportados, como Ni, Rh, Pd e Pt (Stiles, 1994;Ferrughelli, 1992;Fujita, 2002;Díaz, 2008;Agarwal, 2009), em condições de temperatura elevada et al, 1978b;et al, 1978) e pressões moderadas de hidrogêneo (Stiles, 1994;Fujita, 2002;Díaz, 2008;Imai, 1977;Ferrughelli, 1992;Ukisu, 1996;Ukisu, 2004;Weiss, 1966;Zhang, 1994;Simagina, 2003;Coq, 1986;Gioia, 1994;Zhang, 2008;Fang, 2008;LaPierre, 1978;Aramendia, 2000;Kume, 2008;Janiak, 2008;Janiak, 2004;Ukisu, 2003;Monguchi, 2006;De La Rosa, 2014;Chen, 2012;Kim, 2010). A evolução dos catalisadores permitiu o uso de condições reacionais mais brandas (Roy, 2004;Sun, 2006;Matheson, 1994;Fang, 2008;Ma, 2014) (Hoke;…”

Section: Catálise Heterogêneaunclassified

Hidrodescloração catalítica de bifenilas policloradas (PCB) em dióxido de carbono supercrítico

Vale¹

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xi Resumo (Vale, L.A.S.) Hidrodescloração catalítica de bifenilas policloradas (PCB) em dióxido de carbono supercrítico. 2013. 134p. Tese (Doutorado) -A reação de hidrodescloração catalítica (HDC) de bifenilas policloradas (PCB) foi estudada em diversos sistemas reacionais: solventes orgânicos, dióxido de carbono supercrítico, presença e natureza de aditivos (bases e cosolventes) a temperaturas na faixa de 25 ºC a 100 ºC e pressões de 1 bar até 250 bar. Os reagentes utilizados foram um composto modelo (2,4diclorobifenil), misturas comerciais de PCB (Aroclor, Ascarel) e outros compostos halogenados (clorobenzenos e bromoclorobenzeno).Os catalisadores avaliados, paládio suportado em carvão ativo (Pd/C), paládio suportado em sílica mesoporosa (Pd/SiO 2 ), nanopartículas ferromagnéticas de paládio (FFSiNH 2 Pd), e nanopartículas ocas de paládio (PdNP) e de platina (PtNP), mostraram-se versáteis nas mais diversas condições, quer sejam condições supercríticas, presença ou não de água, presença e natureza da base e diferentes doadores de hidrogênio.Em dióxido de carbono, dois regimes reacionais foram avaliados: dióxido de carbono subcrítico, onde o gás atua como agente expansor da fase líquida ao se dissolver nela permitindo que a reação ocorra em uma fase líquida rica em gás hidrogênio; e dióxido de carbono supercrítico, sistema onde a temperatura influencia fortemente a reação e a pressão tende a ter efeito negativo sobre a velocidade de reação, devido a efeitos de diluição e de competição das moléculas do gás com as moléculas dos reagentes.A condição reacional ótima foi determinada para o regime supercrítico e dados cinéticos foram obtidos para os regimes sub-e supercrítico.Palavras-chave: PCB, hidrodescloração catalítica, dióxido de carbono supercrítico, bifenilas policloradas. xii xiii Abstract (Vale, L.A.S.) Catalytic hydrodechlorination of polychlorinated biphenyls (PCB) in supercritical carbon dioxide. 2013. 134p. Ph.D. Thesis -Graduate Program in Chemistry.

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Kinetics of 10% Pd/C-catalysed hydrogenolysis of chlorobenzene dissolved in n-heptane by gaseous hydrogen in contact with aqueous NaOH or water

Cited by 15 publications

References 44 publications

Synthesis of 3-tert-butylaniline by Using Hydrodechlorination Technology

Synthesis of 3-tert-butylaniline by Using Hydrodechlorination Technology

Kinetics Study of the Hydrodechlorination of Chlorobenzene Catalyzed by Immobilized Copper Complexes

Hidrodescloração catalítica de bifenilas policloradas (PCB) em dióxido de carbono supercrítico

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