| 摘要 |
A COMPOSITION FOR CONTROLLING NOx EMISSIONS DURING FCC PROCESSES COMPRISES (i) AN ACIDIC OXIDE SUPPORT, (ii) CERIUM OXIDE, (iii) A LANTHANIDE OXIDE OTHER THAN CERIA SUCH AS PRASEODYMIUM OXIDE, AND (iv), OPTIONALLY AN OXIDE OF A METAL FROM GROUPS Ib AND IIb SUCH AS COPPER, SILVER AND ZINC.
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