Abstract
A series of rare earth zeolites Ln–ZSM-5 (Ln = La, Ce, Pr, Nd) were synthesized directly via a one-step hydrothermal method. The obtained zeolites were used as support and applied in low-temperature CO oxidation. The influence of various factors such as rare earth types, rare earth contents, particle sizes of molecular sieve, and silica alumina ratios, etc., on the catalytic activity of CO oxidation were investigated in detail. The results showed that low silica small size Ce–ZSM-5 (1 % Ce content) had the highest activity. The results also showed that Ce–ZSM-5 zeolite prepared by one-step direct synthesis was more suitable as catalytic support than ZSM-5 or Ce/ZSM-5 zeolite, prepared by impregnation of ZSM-5 with Ce.
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