Acid strength distributions in the Mo?Al?Si and the Ni?Mo?Al oxide systems determined by ammonia adsorption |
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| Authors: | J Laine J Brito S Yunes and P Andréu |
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| Institution: | (1) Centro de Química, I. V. I. C., Apartado 1827, 1010-A Caracas, Venezuela;(2) Present address: INTEVEP, Aptdo 76343, 1070 Caracas, Venezuela |
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| Abstract: | Acid strength distributions of Mo–Al–Si and Ni–Mo–Al oxide systems have been found by means of a relationship that gives pKa values from amounts of ammonia adsorption. Molybdenum is suggested to cause a homogenization in the acid strength distribution of alumina but a heterogenization in silicaalumina, whereas nickel is found to neutralize strong acid sites inherent to molybdenum.
                  Mo–Al–Si Ni–Mo–Al      ,    .    ,  , .
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