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[ÇóÖú] PtSnNaLa/ZSM-5 catalystsÖÆ±¸ÖйØÓÚº¬Á¿ÎÊÌâ

PtSnNaLa/ZSM-5 catalysts were prepared by sequential impregnation method. The powder H-ZSM-5 (Si/Al = 120) was impregnated in an aqueous solution of 0.123 M La(NO3)3 at 80 8C for 4 h to obtain 0, 0.7, 1.4, 2.1 and 2.9 wt% La, then dried at 80 8C for 3 h under air flow. Afterwards, the samples were impregnated at 80 8C for 4 h in solutions mixture of 0.033 M H2PtCl6, 0.153 M SnCl4 and 0.427 M NaCl. Finally the prepared catalysts were dried at 80 8C for 3 h. The nominal compositions of the each sample were 0.5 wt% for Pt, 1.0 wt% for Sn, and 1.0 wt% for Na, respectively.
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