Abstract
Abstract A Ru–Ir/γ-Al2O3 bimetallic catalyst was prepared by impregnating γ-Al2O3 with an isopropylalcohol solution of RuCl3 and H2IrCl6. The effect of organic amine modifiers on the selective hydrogenation of p-chloronitrobenzene (p-CNB) over Ru–Ir/γ-Al2O3 was investigated. The addition of ethylenediamine and L-lysine remarkably improved the catalytic activity of Ru–Ir/γ-Al2O3 and the selectivity for p-chloroaniline (p-CAN) at high conversion of p-CNB. In the presence of ethylenediamine, the conversion of p-CNB increased from 37.2% to 95.6% and the selectivity for p-CAN was maintained at 100%. Similarly, the addition of L-lysine greatly enhanced the activity of the catalyst and completely suppressed the formation of by-products. The promotion effect was attributed to the coordination of ethylenediamine or L-lysine with the metal center, which improved the cooperation between ruthenium and iridium.
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