Abstract
Synthesis of the cross-linked humic acid supporting palladium catalyst and its catalytic properties for Heck reaction Cross-linked humic acid supporting palladium (CL-HA-Pd) catalyst was prepared readily and characterized by infrared analysis (IR) and thermogravimetric analysis (TG). The catalyst could catalyze the Heck reaction of aryl halide or substituted aryl halide with vinyl compounds in N2 atmosphere; the yields were above 95%. The catalyst could be recovered and reused 7 times with the Heck reaction of iodobenzene with acrylic acid, and the yield was above 75.6%. The results showed that the catalyst had high catalytic activity even at low temperature of 62°C or with a small amount of the catalyst.
Highlights
Humic acid(HA) as a heterogeneous mixture of organic widely exists in peat, lignite, stream, river, wetland, lake, and ground water
The cross-linked humic acid (CL-HA)-Pd catalyst is prepared by using the CL-HA supporting palladium chloride, and the catalytic properties of CLHA-Pd catalyst were studied
The results showed that they had great difference in solubility, which means that humic acid can dissolve in water and 3% NaOH solution and the cross-linked humic acid was hard to dissolve
Summary
Humic acid(HA) as a heterogeneous mixture of organic widely exists in peat, lignite, stream, river, wetland, lake, and ground water. The molecular structure of HA contains double bonds and aromatic rings bearing various functional groups, such as carboxyl (-COOH), hydroxyl (-OH), amino (-NH2), quinonyl (-C6H3O2). These functional groups can form water-soluble, colloidal and water-insoluble complexes of different chemical and biological stability properties[1,2,3,4,5]. The objective of this study is to prepare the cross-linked humic acid (CL-HA) with epichlorohydrin as a cross-linking agent, and to form partial network structure. The CL-HA-Pd catalyst is prepared by using the CL-HA supporting palladium chloride, and the catalytic properties of CLHA-Pd catalyst were studied
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