Abstract
Three different zeolitic catalytic systems (13X, 5A and Ammonium Y) were tested for their dielectric properties, surface area and pore-size distribution. The 13X catalyst conductance is higher than other catalysts. The activation energies for 13X, 5A and Ammonium Y are 100, 80, and 50 kJ/mole respectively. The capacitances of 13X catalyst increase with increasing temperature causing a complex behaviour at higher temperatures and frequencies while the capacitances of 5A catalyst are usually less than 10 pF and those of Ammonium Y catalyst are erratic at low temperature. The 13X catalyst is the most suitable catalyst for its dielectric properties and proves to have a good potential to be heated by a RF dielectric reactor. The BET surface area in m2/g are 524 ± 2, 353 ± 1 and 684 ± 3 while the average pore diameters (in Å) by the BET technique are 33, 22, 26 and the micropore volumes in cm3/g are 0.187, 0.125 and 0.220 for 13X, 5A and Ammonium Y respectively.
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J.R. Walls, J.K. Lee and A. Ovenston, in: 8th International Symposium on Chem. Reactor Eng., eds. G.S.G. Beveridge and P.N. Rowe, Edinburgh, 10–13 Sept., IChemE Ser. 87 (1984) p. 463.
A. Ovenston and J.R. Walls, J. Chem. Soc. Faraday Trans. 1(79) (1983) 1073.
A. Ovenston, S. Miri and J.R. Walls, in: Advanced Ceramics in Chemical Process Engineering, eds. B.C.H. Steele and D.P. Thompson, British Ceramic Proceedings No. 43, London, Dec. (The Institute of Ceramics), (1988a) p. 57.
A. Ovenston and J.R. Walls, Trans. IChemE 68(A) (1990) 530.
B.W. Wojciechowski and A. Corma, Catalytic Cracking: Catalysts, Chemistry, and Kinetics (Marcel Dekker, New York, 1986).
J. Scherzer, Octane-Enhancing Zeolitic FCC Catalysts (Marcel Dekker, New York, 1990).
Gates et al. 1979.
D. Decroocq, Catalytic Cracking of Heavy Petroleum Fractions (Technip, Paris 1984).
C.T. O'Connor, E. Van Steen and M.E Dry, Stud. Surf. Sci. Catal. 102 (1996) 323.
A.W. Chester, W.E. Cromier and W.A. Stover, U.S. Patent No. 4,368,114 (1983).
A.C. Metaxas and R.J. Meredith, Industrial Microwave Heating (Peter Peregrinus Ltd., UK, 1988).
A. Ovenston, J.R. Walls, S. Miri and T. Ramdeen, J. Phys. D: Appl. Phys. 21 (1988b) 1773.
M.T. Mirza, J.R. Walls and S.A. Jayaweera, Paper presented at the 22nd Int. Vacuum Microbalance Techniques Conf., Rabat, Morocco (1987).
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Al-Mayman, S., al-Zahrani, S. Catalytic Cracking of Gas-Oils in Electromagnetic Fields: I—Dielectric Properties of Zeolitic Catalysts. Catalysis Letters 78, 331–337 (2002). https://doi.org/10.1023/A:1014900416493
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DOI: https://doi.org/10.1023/A:1014900416493