Hostname: page-component-cd9895bd7-mkpzs Total loading time: 0 Render date: 2024-12-27T23:42:57.308Z Has data issue: false hasContentIssue false
  • English
  • Français

Porous Al2O3/Al catalyst supports fabricated by an Al(OH)3/Al mixture and the effect of agglomerates

Published online by Cambridge University Press:  01 March 2005

Zhen-Yan Deng ,
Yoshihisa Tanaka ,
Yoshio Sakka  and
Yutaka Kagawa
Zhen-Yan Deng*
Affiliation:
Composite Materials Group, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
Yoshihisa Tanaka
Affiliation:
Composite Materials Group, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
Yoshio Sakka
Affiliation:
Fine Particle Processing Group, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
Yutaka Kagawa
Affiliation:
Composite Materials Group, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan; and Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan
*
a)Address all correspondence to this author. e-mail: DENG.Zhenyan@nims.go.jp
Get access

Abstract

Porous Al2O3/Al catalyst supports were fabricated using a mixture of Al(OH)3 and Al powders, followed by pressureless sintering at a temperature of 600 °C in vacuum. Different pressures were used to prepare green compacts. High compaction pressure led to a high surface area and good mechanical and electrical properties for the sintered specimens. However, when the Al content in the sintered specimen exceeded a definite value, high compaction pressure decreased the surface area abruptly. Scanning electron microscopy observations revealed that agglomeration in the starting mixture has a significant effect on the microstructure of the sintered specimens. High compaction pressure greatly eliminated the agglomerates and led to a uniform microstructure for the sintered specimens. However, when the Al content in the starting mixture was too high, Al particles in the compacts prepared by the high pressure were largely sintered due to the high compact density so that most of the pores were closed. The present study indicates that a suitable compaction pressure is critical to obtaining superior Al2O3/Al supports.

Keywords

AgglomerationCermetPorosity
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 3 , March 2005 , pp. 672 - 679
Copyright
Copyright © Materials Research Society 2005

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Mazzarino, I. and Barresi, A.A.: Catalytic combustion of voc mixtures in a monolithic reactor. Catal. Today 17, 335 (1993).CrossRefGoogle Scholar
2.Watari, K. and Shinde, S.L.: High thermal conductivity materials. MRS Bull. 26, 440 (2001).CrossRefGoogle Scholar
3.Take, T., Yachi, T., Tomura, M. and Kameyama, H.: Development of plate-fin-type methanol reformer. J. Chem. Eng. Jpn. 36, 75 (2003).CrossRefGoogle Scholar
4.Burgos, N., Paulis, M.A. and Montes, M.: Preparation of Al2O3/Al monoliths by anodisation of aluminium as structured catalytic supports. J. Mater. Chem. 13, 1458 (2003).CrossRefGoogle Scholar
5.Tikhov, S.F., Fenelonov, V.B., Sadykov, V.A., Potapova, Y.V. and Salanov, A.N.: Porous Al2O3/Al metal ceramics prepared by the oxidation of aluminum powder under hydrothermal conditions followed by thermal dehydration: I composition and macrocharacteristics of composites. Kinet. Catal. 41, 826 (2000).CrossRefGoogle Scholar
6.Tikhov, S.F., Potapova, Y.V., Sadykov, V.A., Salanov, A.N., Tsybulya, S.V., Litvak, G.S. and Melgunova, L.F.: Synthesis and properties of highly porous MeOx/Al2O3/Al composites (Me = Mg, Ca, La, Ti, Al). React. Kinet Catal. Lett. 77, 267 (2002).CrossRefGoogle Scholar
7.Rat’ko, A.I., Romanenkov, V.E., Bolotnikova, E.V. and Krupen’kina, Z.V.: Hydrothermal synthesis of porous Al2O3/Al metal ceramics: 1. Oxidation of aluminum powder and structure formation of porous Al(OH)3/Al composite. Kinet. Catal. 45, 141 (2004).CrossRefGoogle Scholar
8.Guo, Y., Sakurai, M., Kameyama, H., Matsuyama, A. and Kudoh, Y.: Preparation of alumite support and preliminary activity investigation for NO removal in SCR-HC over alumite catalyst. J. Chem. Eng. Jpn. 36, 1470 (2003).CrossRefGoogle Scholar
9.Tikhov, S.F., Sadykov, V.A., Potapova, Y.A., Salanov, A.N., Kustova, G.N., Litvak, G.S., Zaikovskii, V.I., Tsybulya, S.V., Pavlova, S.N., Ivanova, A.S., Rozovskii, A.Y., Lin, G.I., Lunin, V.V., Ananyin, V.N. and Belyaev, V.V.: The study of formation of supports and catalysts based upon Al2O3/Al cermets. Stud. Surf. Sci. Catal. 118, 797 (1998).CrossRefGoogle Scholar
10.Broek, D.: Elementary Engineering Fracture Mechanics, 4th ed. (Martinus Nijhoff Publishers, Leiden, The Netherlands, 1986).Google Scholar
11.Bagwell, R.B. and Messing, G.L.: Critical factors in the production of sol-gel derived porous alumina. Key Eng. Mater. 115, 45 (1996).CrossRefGoogle Scholar
12.Deng, Z.Y., Fukasawa, T., Ando, M., Zhang, G.J. and Ohji, T.: Microstructure and mechanical properties of porous alumina ceramics fabricated by the decomposition of aluminum hydroxide. J. Am. Ceram. Soc. 84, 2638 (2001).CrossRefGoogle Scholar
13.Zallon, R.: Physics of Amorphous Solids (Wiley, New York, 1983), Chap. 4.CrossRefGoogle Scholar
14.Zok, F., Lange, F.F. and Porter, J.R.: Packing density of composite powder mixtures. J. Am. Ceram. Soc. 74, 1880 (1991).CrossRefGoogle Scholar
15.Zhang, G.J. and Ohji, T.: Effect of BN content on elastic modulus and bending strength of SiC-BN in situ composites. J. Mater. Res. 15, 1876 (2000).CrossRefGoogle Scholar
16.Bagwell, R.B. and Messing, G.L.: Effect of seeding and water vapor on the nucleation and growth of α–Al2O3 from γ–Al2O3. J. Am. Ceram. Soc. 82, 825 (1999).CrossRefGoogle Scholar
17.Lange, F.F.: Sinterability of agglomerated powders. J. Am. Ceram. Soc. 67, 83 (1984).CrossRefGoogle Scholar
18.Song, J.H. and Evans, J.R.G.: A die pressing test for the estimation of agglomerate strength. J. Am. Ceram. Soc. 77, 806 (1994).CrossRefGoogle Scholar
19.Lannutti, J.J.: Characterization and control of compact microstructure. MRS Bull. 22(12), 38 (1997).CrossRefGoogle Scholar
20.Deng, Z.Y., Shi, J.L., Zhang, Y.F., Lai, T.R. and Guo, J.K.: Creep and creep-recovery behavior in silicon-carbide-particle-reinforced alumina. J. Am. Ceram. Soc. 82, 944 (1999).CrossRefGoogle Scholar
21.Flinn, B.D., Bordia, R.K., Zimmermann, A. and Rodel, J.: Evolution of defect size and strength of porous alumina during sintering. J. Eur. Ceram. Soc. 20, 2561 (2000).CrossRefGoogle Scholar
22.Rice, R.W.: Limitations of pore-stress concentrations on the mechanical properties of porous materials. J. Mater. Sci. 32, 4731 (1997).CrossRefGoogle Scholar
23.Rice, R.W.: Comparison of physical property porosity behaviour with minimum solid area models. J. Mater. Sci. 31, 1509 (1996).CrossRefGoogle Scholar
24.Hsueh, C.H., Evans, A.G., Cannon, R.M. and Brook, R.J.: Viscoelastic stresses and sintering damage in heterogeneous powder compacts. Acta Metall. 34, 927 (1986).CrossRefGoogle Scholar
25.De Jonghe, L.C., Rahaman, M.N. and Hsueh, C.H.: Transient stresses in bimodel compacts during sintering. Acta Metall. 34, 1467 (1986).CrossRefGoogle Scholar