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首页> 外文期刊>Catalysis science & technology >Dendritic phosphotungstate hybrids efficiently catalyze the selective oxidation of alcohols with H2O2
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Dendritic phosphotungstate hybrids efficiently catalyze the selective oxidation of alcohols with H2O2

机译：树突状磷酸恒星杂种有效地催化H2O2的醇的选择性氧化

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摘要

Keggin-type phosphotungstic acid (HPW) was incorporated into the polyamidoamine (PAMAM) matrix by partly protonating the amino groups of the PAMAM dendrimer. Characterization results suggested that the PAMAM dendrimer accommodated trivalent PW anions through ionic interactions and hydrogen bonds, resulting in novel dendritic phosphotungstate hybrids (dendri-PW hybrids). The dendritic PAMAM matrix as a countercation not only fine-tunes the redox properties of the PW anions but also has a positive "dendrimer effect" on the enhancement of the catalytic activity of the hybrids. Higher conversion of alcohols was observed over the dendri-PW hybrids in the selective oxidation of alcohols with H2O2 than over their non-dendritic counterparts. Furthermore, the dendritic ammonium cations impart reaction-controlled phase-transfer function to the dendri-PW hybrids. The catalysts precipitated from the solvent upon consumption of H2O2 and could be reused several times without loss of activity and selectivity.
机译：通过将PAMAM树突状聚体的氨基组部分质子化，将Keggin型磷酸烟酸（HPW）掺入聚酰胺胺（PAMAM）基质中。表征结果表明，PAMAM树枝状聚合物通过离子相互作用和氢键可容纳三价阴离子，从而导致新型的树突状磷酸磷酸化杂种（Dendri-PW杂种）。树突状PAMAM矩阵作为反应不仅是PW阴离子的氧化还原特性，而且对杂种催化活性的增强具有阳性的“树枝状聚合物效应”。与非树枝质氧化相比，在醇的选择性氧化中，在Dendri-PW杂种中观察到醇的转化率更高。此外，树突状铵阳离子将反应控制的相转移函数赋予了Dendri-PW杂种。催化剂在消耗H2O2时从溶剂中沉淀出来，可以重复多次，而不会丧失活动和选择性。

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