Preparation of Ni-ZrO2 composites via mechanochemistry processes and their catalytic properties
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Ni-ZrO2 catalytic materials were prepared by the selective oxidation of Ni-ZrH2 composite and amorphous Ni-Zr alloypowders synthesized by means of ball milling of NiZr2 alloys under pressurized H2 and Ar atmospheres, respectively. Structural characterization was performed using X-ray diffraction and transmission electron microscopy. Ni-ZrH2 compositeand amorphous Ni-Zr alloy powders were oxidized at 550 oC and 800 oC, respectively. The size of Ni particles in Ni-ZrO2-hranged from 5 to 20 nm while that of Ni-ZrO2-a were not separated obviously as fine particles. The mean sizes of the Niparticles in Ni-ZrO2-h and Ni-ZrO2-a obtained by XRD were about 16.9 nm and 28.4 nm, respectively. The methanolconversion ratio of Ni-ZrO2-h was higher than that of the Ni-ZrO2-a catalysts at all temperatures. Furthermore, it was foundthat Ni-ZrO2-h has a highly endurable structure. It is believed that the enhanced catalytic properties of Ni-ZrO2-h are due toits high surface area and separately dispersed Ni nanoparticles.
Abstract
Ni-ZrO2 catalytic materials were prepared by the selective oxidation of Ni-ZrH2 composite and amorphous Ni-Zr alloypowders synthesized by means of ball milling of NiZr2 alloys under pressurized H2 and Ar atmospheres, respectively. Structural characterization was performed using X-ray diffraction and transmission electron microscopy. Ni-ZrH2 compositeand amorphous Ni-Zr alloy powders were oxidized at 550 oC and 800 oC, respectively. The size of Ni particles in Ni-ZrO2-hranged from 5 to 20 nm while that of Ni-ZrO2-a were not separated obviously as fine particles. The mean sizes of the Niparticles in Ni-ZrO2-h and Ni-ZrO2-a obtained by XRD were about 16.9 nm and 28.4 nm, respectively. The methanolconversion ratio of Ni-ZrO2-h was higher than that of the Ni-ZrO2-a catalysts at all temperatures. Furthermore, it was foundthat Ni-ZrO2-h has a highly endurable structure. It is believed that the enhanced catalytic properties of Ni-ZrO2-h are due toits high surface area and separately dispersed Ni nanoparticles.
참고문헌 (16)
- X. Hu, , Appl. Catal. B : Environ, 99, pp.289~297 (2010)
- X. Hu, , Green Chem, 11, pp.724~732 (2009)
- S. Natesakhawat, , J. Mol. Catal. A : Chem, 241, pp.133~146 (2005)
- L. Zhou, , Appl. Catal. A : Gen, 347, pp.200~207 (2008)
- H. W. Chen, , Catal. Today, 97, pp.173~178 (2004)
- A. M. Ruppert, , Applied Catalysis B, 145, pp.85~90 (2014)
- R. V. Kumar, , J. Mater. Chem, 11, pp.1209~1214 (2001)
- H. Wang, , J. Cryst. Growth, 244, pp.88~93 (2002)
- 유연태, "Au", SnO2 core-shell 나노구조 센서의 구동온도가 CO 감도에 미치는 영향, 2012, pp.21(6), 456~460[DOI]
- P. G. Callahan, , J. Nucl. Mater, 392, pp.121~128 (2009)
- M. Ghasdi, , Sensor. Actuat. B, 148, pp.478~484 (2010)
- Y. K Cho, , Ceram. Int. 41, pp.13589~13597 (2015)
- 박제신, "CO Gas-Sensing Properties of CuO-TiN and CuO-TiN-TiO2 Prepared by Controlled Oxidation of Cu-TiN Composites", Metals and Materials International, 21(2), pp.330~336 (2015), 대한금속·재료학회[DOI]
- 임채훈, "CO Gas-Sensing Properties of CuO-TiN and CuO-TiO2 Prepared via an Oxidizing Process of a Cu-TiN Composite Synthesized by a Mechanically Induced Gas-Solid Reaction", Metals and Materials International, 20(2), pp.323~328 (2014), 대한금속·재료학회[DOI]
- C. Suryanarayana, "X-ray Diffraction A Practical Approach", pp.213~ (1998), Plenum Press
- K. Hashimoto, , Mater. Sci. Eng. A, 304-306 (2001)