Preparation and characterization of hydrophobic Pt-Fe catalysts with enhanced catalytic activities for interface hydrogen isotope separation.
Liquid phase catalytic exchange reactions are mainly used for separation of hydrogen isotopes from liquid water. Based on the carbon-supported Pt and Pt-Fe catalysts, different hydrophobic Pt and Pt-Fe catalysts were fabricated for use in such reactions. The characterization results indicated the Pt-Fe alloy was formed in the Pt(3)Fe/C catalyst prepared using a citric-acid-assisted NaBH(4) reduction method (CA-NaBH(4)). However, there were more Fe oxide species and the Fe components existed independently in the Pt(3)Fe/C catalyst prepared by the modified microwave-irradiated ethyl glycol reduction procedure (MI). Performance tests demonstrated that the activities of the hydrophobic Pt-Fe catalysts with appropriate Fe/Pt ratios, using the MI method, were enhanced because of the addition of Fe. In contrast, the hydrophobic Pt(3)Fe catalyst prepared using the CA-NaBH(4) method had lower catalytic activity than pure Pt. Possible reasons were explained by reaction mechanisms of double routes of LPCE catalysis.
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China. husheng@126.com
Sheng
S
Hu
Jingwei
J
Hou
Liangping
L
Xiong
Kuiping
K
Weng
Xingbi
X
Ren
Yangming
Y
Luo
D002384:Catalysis; D006859:Hydrogen / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D007554:Isotopes; D046529:Microscopy, Electron, Transmission; D010984:Platinum / Q000737:chemistry*; D014961:X-Ray Diffraction
D007554:Isotopes; D010984:Platinum; D006859:Hydrogen; D007501:Iron