Pd nanoparticles immobilized on TiO2 nanotubes-functionalized ceramic membranes for flow-through catalysis
A high performance catalytic membrane was fabricated with Pd nanoparticles supported by TiO2 nanotubes, where the TiO2 nanotubes were synthesized on the ceramic membrane via a simple hydrothermal etching. A flow-through catalytic membrane reactor was developed for testing the catalytic properties in the p-nitrophenol reduction. The effect of etching time was investigated in detail and an optimal etching time was determined to be 16 h. The characterization results highlighted that the as-prepared bouquet-like TiO2 nanotubes could significantly improve the loading amount and dispersity of Pd nanoparticles. The fabricated catalytic membrane exhibited considerably improved catalytic activity and stability, with a 100% conversion of p-nitrophenol and no loss in catalytic activity during five reaction cycles. The obtained activation energy was much lower than the values in literatures, implying that the p-nitrophenol reduction could take place more easily on our catalytic membranes compared to other catalysts.
KeywordsCatalytic Membrane Pd Nanoparticles Tio2 Nanotubes Ceramic Membranes p-Nitrophenol Reduction
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- 32.L. Liu, J. S. Qian, B. Li, Y. M. Cui, X. F. Zhou, X. F. Guo and W. P. Ding, Res. Chem. Intermed., 46, 1569 (2010).Google Scholar