Abstract
Nano-sized gold catalysts have attracted much interest during recent years. Here, we report a new material to improve the catalytic activity and recyclability of gold catalysts. Multi-component Fe–Al–O oxides prepared by impregnation (γ-Fe2O3/γ-Al2O3 and Al2O3/α-Fe2O3) and encapsulation (Fe2O3@Al2O3) methods were employed as carriers for gold catalysts. The Au/Fe–Al–O composites exhibited efficient catalytic activity and selectivity for the lactonization of 1,4-butanediol to γ-butyrolactone. They could also be easily recovered due to their super-paramagnetic property. XRD, TEM, XPS and H2-TPR were used to characterize the composites. The influence of surface Fe/Al ratio on Au/(Fe2O3@Al2O3) composites was also studied by adjusting the Fe/Al molar ratio for comparison and the optimal Fe/Al ratio was found to be 1 : 4. The results confirmed that higher conversion and selectivity were obtained due to the bifunctional effect of Fe2O3 and Al2O3.
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