| 摘要 |
Oxidic composition consisting essentially of oxidic forms of a first metal, a second metal, and optionally a third metal, the first metal being either Ca or Ba and being present in the composition in an amount of from about 5 to about 80 wt %, the second metal being Al and being present in the composition in an amount of from about 5 to about 80 wt %, the third metal being selected from the group consisting of La, Ti, and Zr, and being present in an amount of from 0 to about 17 wt %-all weight percentages calculated as oxides and based on the weight of the oxidic composition, the oxidic composition being obtainable by (a) preparing a physical mixture comprising solid compounds of the first, the second, and the optional third metal, (b) optionally aging the physical mixture, without anionic clay being formed, and (c) calcining the mixture. This composition is suitable for use in FCC processes for the passivation of metals with only minimal influence on the zeolite's hydrothermal stability.
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