1. Sino-Precious Metals Holding Co., Ltd., Kunming 650106, P. R. China
2. School of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
3. State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-Platinum Metals Catalysts Co., Ltd., Kunming 650106, P. R. China