Influences of synthesis methods and modifier addition on the properties of Ni-based catalysts supported on reticulated ceramic foams
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A method of synthesizing Ni-based catalysts supported on α-Al2O3-based foams was developed. The foams were impregnated with aqueous solutions of metal chlorides under an air atmosphere using an aerosol route. Separate procedures involved calcination to form oxides and drying to obtain chlorides on the foam surface. The synthesized samples were subsequently reduced with hydrogen. With respect to the Ni/Al2O3 catalysts, the chloride reduction route enabled the formation of a Ni coating without agglomerates or cracks. Further research included catalyst modification by the addition of Pd, Cu, and Fe. The influences of the additives on the degree of reduction and on the low-temperature reduction effectiveness (533 and 633 K) were examined and compared for the catalysts obtained from oxides and chlorides. Greater degrees of reduction were achieved with chlorides, whereas Pd was the most effective modifier among those investigated. The reduction process was nearly complete at 533 K in the sample that contained 0.1wt% Pd. A lower reduction temperature was utilized, and the calcination step was avoided, which may enhance the economical and technological aspects of the developed catalyst production method.
Keywordscatalysts nickel ceramic foams modification aerosol process catalytic properties
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- C.B. Alcock, Thermochemical Processes: Principles and Models, Butterworth-Heinemann, Oxford, 2001, p. 130.Google Scholar
- Y. Zhang, Y.H. Tang, E.L. Zhang, L.W. Lin, and L.Z. Pei, Preparation of Ni/MgO catalysts for carbon nanofibres by a self-propagating low temperature combustion process, Mater. Sci. Poland, 28(2010), No. 4, p. 805.Google Scholar
- G. Matula, J. Bogović, S. Stopić, and B. Friedrich, Scale-up of the ultrasonic spray pyrolysis (USP) process for nanopowder production (Part 1), Powder Inject. Mould. Int., 7(2013), No. 1, P. 75.Google Scholar
- V. Nikolić, Ž. Kamberović, Z. Andić, M. Korać, A. Vujović, and M. Sokić, Alumina based catalytically active components carriers with improved properties, [in] Proceedings of the 44th International October Conference on Mining and Metallurgy, Bor, Serbia, 2012, p. 395.Google Scholar
- V. Nikolić, Ž. Kamberović, Z. AnĐić, M. Korać, and M. Sokić, Synthesis of α-Al2O3 based foams with improved properties as catalyst carriers, Mater. Technol., 48(2014), No. 1, p. 45.Google Scholar
- Ž. Kamberović, M. Sokić, V. Matković, Z. Andić, M. Korać, and V. Nikolić, Effects of additives on nickel(II)-chloride hydrogen reduction for production of nanocomposite catalysts, Metall. Int., 17(2012), No. 5, p. 37.Google Scholar
- M. Šušić, S. Stopić, I. Ilić, and D. Uskoković, Kinetics of hydrogen absorption by nickel powder with added palladium, copper, and nickel from nickel-chloride reduction by hydrogen, Int. J. Hydrogen Energy, 22(1997), No. 7, p. 661.Google Scholar
- C. Amorim and M. A. Keane, Catalytic hydrodechlorination of chloroaromatic gas streams promoted by Pd and Ni: the role of hydrogen spillover, J. Hazard. Mater., 211–212(2011), p. 208.Google Scholar