氨基酸添加剂对Ir/γ-Al_2O_3催化对氯硝基苯选择加氢的影响
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摘要
采用浸渍法制备了贵金属铱催化剂,用于对-氯硝基苯(p-CNB)催化加氢反应,考察了温度、氢压和添加氨基酸对催化反应的影响。研究表明,添加L-Lysine(赖氨酸)时,催化剂的活性和目标产物(对-氯苯胺,p-CAN)的选择性均显著提高,副反应完全被抑制。L-Lysine对Ir/γ-Al2O3贵金属催化剂性能显著的促进作用,可能是由于L-Lysine与催化剂金属活性中心的配位,产生了强烈的协同效应,从而极大的增强了催化剂的催化性能。
A iridium noble metal catalyst was prepared with a isopropylalcohol solution of H2 Ir Cl6in impregnatingγ-Al2O3. The effect of temperature,pressure of hydrogen and amino acids additive on the hydrogenation of p-chloronitrobenzene(p-CNB) over Ir / γ-Al2O3 was investigated. The addition of L-lysine remarkably improved the catalytic activity of Ir / γ-Al2O3 and the selectivity for p-chloroaniline(p-CAN) at high conversion of p-CNB. The presence of L-lysine greatly enhanced the catalyst activity and completely suppressed the formation of by-products. The promotion effect was attributed to the coordination of L-lysine with the active center of the catalyst.
A iridium noble metal catalyst was prepared with a isopropylalcohol solution of H2 Ir Cl6in impregnatingγ-Al2O3. The effect of temperature,pressure of hydrogen and amino acids additive on the hydrogenation of p-chloronitrobenzene(p-CNB) over Ir / γ-Al2O3 was investigated. The addition of L-lysine remarkably improved the catalytic activity of Ir / γ-Al2O3 and the selectivity for p-chloroaniline(p-CAN) at high conversion of p-CNB. The presence of L-lysine greatly enhanced the catalyst activity and completely suppressed the formation of by-products. The promotion effect was attributed to the coordination of L-lysine with the active center of the catalyst.
引文
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[2]Ning J,Xu J,Liu J,et al.A remarkable promoting effect of water addition on selective hydrogenation of p-chloronitrobenzene in ethanol[J].Catal Commun,2007(8):1763-1766.
[3]Shen J,Chen Y.Catalytic properties of bimetallic Ni Co B nanoalloy catalysts for hydrogenation of p-chloronitrobenzene[J].J Mol Catal A:Chem,2007,273:265,276.
[4]Meng X,Cheng H,Fujita S,et al.Selective hydrogenation of chloronitrobenzene to chloroaniline in supercritical carbon dioxide over Ni/Ti O2:significance of molecular interactions[J].J Cata1,2010,269:131-139.
[5]Pietrowski M,Wojciechowska M.An efficient rutheniumvanadium catalyst for selective hydrogenation of ortho-chloronitrobenzene[J].Catal Today,2009,142:211-214.
[6]郭方,王越,吕连海.高分散度Ru/C选择性催化对氯硝基苯加氢制备对氯苯胺[J].精细化工,2007,24(3):252-256.
[7]Xu Q,Liu X M,Chen J R,Li R X,Li X J.Modification mechanism of Sn4+for hydrogenation of p-chloronitrobenzene over PVP-Pd/γ-Al2O3[J].J Mol Catal:A Chem,2006,260(1-2):299-305.
[8]刘新梅,赵松林,陈骏如,等.金属离子对Ru-Pt/γ-Al2O3催化2,5-二氯硝基苯加氢反应的影响[J].石油化工,2004,33(Z1):1008-1009.
[9]杨雪娇,马磊,李小年.Ir/C催化剂氯代硝基苯选择性催化加氢反应性能[J].工业催化,2013,21(4):39-44.
[10]Han X,Zhou R,Zheng X,et al.Effect of rare earth on the hydrogenation properties of p-chloronitrobenzene over polymeranchored platinum catalyst[J].J Mol Catal A:Chem,2003,193:103-08.
[11]Zhou Y,Chen J,Li R.Selective hydrogenation of halonitroaromatic compounds catalyzed by water-soluble bimetallic;catalyst containing ruthenium and platinum[J].Chem J Universities,2004,25(5):884-887.
[12]Roeder S,Ostalyst D,Berweiler M.Process for the preparation of substituted amines by hydrogenation of substituted organic nitro compound[P].US,2002151751,2002.
[13]Chao Xiao,Xiaodong Wang,Chao Lian,Hongquan Liu,Minghui Liang,Yuan Wang.Selective Hydrogenation of Halonitrobenzenes[J].Current Organic Chemistry,2012,16(2):1385-2728.
[14]V.Kratky,M.Kralik,M.Mecarova,M.Stolcova,L.Zalibera,M.Hronec.Effect of catalyst and substituents on the hydrogenation of chloronitrobenzenes[J].Applied Catalysis A,2002,235(1-2):225-231.