| Title |
The Hydrogen Reduction Behavior of Ultrasonic Ball-milled WO3-CuO Nanopowder |
| Authors |
정성수(Sung Soo Jung); 윤의식(Eui Sik Yoon); 이재성(Jai Sung Lee) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
W-Cu; nanopowder; ultrasonic ball-milling; hydrogen reduction; hygrometry |
| Abstract |
The hydrogen reduction behavior of ultrasonic ball-milled WO3-CuO nanopowder, which is highly related with micro-pore structure, was investigated by thermogravimetry(TG) and hygrometry system. EDS and TEM results represented that the ultrasonic ball-milled WO3-CuO nanopowder consisted of the agglomerates which was confirmed as a homogeneous mixture of WO3 and CuO particles. It was found that the reduction reaction of CuO was retarded by initial micro-pores which are smaller than 40 nm in the ultrasonic ball-milled WO3-CuO nanopowder. The earlier agglomeration of Cu particles at comparably low temperature decreased the volume of micro-pores in the WO3-CuO nanopowder which caused the retardation of WO3 reduction reaction. These results clearly explain that the micro-pore structure significantly affected the reduction reaction of WO3 and CuO in the WO3-CuO nanopowder. |