Abstract
AbstractConsidering the high performance of ionic liquid decorated halloysite clay as a catalyst support, herein a halloysite ‐poly (ionic liquid) polymer composite is synthesized and characterized via BET, TGA, TEM, FTIR, XRD and ICP and then applied for the immobilization of Pd species to afford a catalyst for the hydrogenation of nitroarenes. To shed light to the effect of the content and nature of poly (ionic liquid) polymer on the catalytic activity, two control samples with different content and entity of poly (ionic liquid) polymer were synthesized and compared by FTIR, TGA and BET. The results confirmed that the content of poly (ionic liquid) polymer significantly affected the catalytic activity and the higher this value, the higher the Pd content and consequently the superior the catalytic activity would be. The study of the nature of poly (ionic liquid) polymer revealed that it did not dramatically influence the catalytic activity. However, the choice of the monomer affected the content of poly (ionic liquid) polymer formed on halloysite. Notably, the catalyst was highly selective toward reduction of nitro group and competing functionalities remained intact under the reaction condition. Moreover, the catalyst showed excellent recyclability with low Pd leaching.
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