Rare Earth Metals Ion-exchanged β-Zeolites as Supports of Platinum Catalysts for Hydroisomerization of n-Heptane

Abstract

Abstract: A series of Pt catalysts supported on the Hβ-zeolite that is ion-exchanged with the rare earth metal ions of Ce(Ⅲ) and La(Ⅲ),are prepared by impregnation,characterized by inductively coupled plasma (ICP),X-ray diffraction (XRD),BET,temperature-programmed desorption of ammonia (NH3-TPD),temperature-programmed reduction of hydrogen (H2-TPR) and H2-chemisorption techniques,and evaluated in the hydroisomerization of n-heptane with an atmospheric fixed-bed reactor.The reaction temperature,time on stream,space velocity,and the ratio of H₂/n-heptane are changed to get the optimal conditions.The Ce(III) and La(Ⅲ)-exchanged Hβ-zeolites exhibit higher selectivity for isomerized products than the neat Hβ-zeolite.Moreover,the Ce(Ⅲ)-exchanged catalysts give higher conversions of n-heptane,whereas the La(Ⅲ)-exchanged ones do not show any improvement in con-version.Under optimal conditions,the catalyst with 0.4% (by mass) Pt and 0.5% (by mass) Ce loading presents very high selectivity of isomerized products of 95.1% coupled with high n-heptane conversion of 68.7%.Effects of the ion-exchange of Ce(Ⅲ) and La(Ⅲ) on the catalytic performance are discussed in relation with the physico-chemical properties of catalysts.

Key words: hydroisomerization of n-heptane, β-zeolite, bifunctional catalyst, Ce, La

摘要： A series of Pt catalysts supported on the Hβ-zeolite that is ion-exchanged with the rare earth metal ions of Ce(Ⅲ) and La(Ⅲ),are prepared by impregnation,characterized by inductively coupled plasma (ICP),X-ray diffraction (XRD),BET,temperature-programmed desorption of ammonia (NH3-TPD),temperature-programmed reduction of hydrogen (H2-TPR) and H2-chemisorption techniques,and evaluated in the hydroisomerization of n-heptane with an atmospheric fixed-bed reactor.The reaction temperature,time on stream,space velocity,and the ratio of H₂/n-heptane are changed to get the optimal conditions.The Ce(III) and La(Ⅲ)-exchanged Hβ-zeolites exhibit higher selectivity for isomerized products than the neat Hβ-zeolite.Moreover,the Ce(Ⅲ)-exchanged catalysts give higher conversions of n-heptane,whereas the La(Ⅲ)-exchanged ones do not show any improvement in con-version.Under optimal conditions,the catalyst with 0.4% (by mass) Pt and 0.5% (by mass) Ce loading presents very high selectivity of isomerized products of 95.1% coupled with high n-heptane conversion of 68.7%.Effects of the ion-exchange of Ce(Ⅲ) and La(Ⅲ) on the catalytic performance are discussed in relation with the physico-chemical properties of catalysts.

关键词: hydroisomerization of n-heptane, β-zeolite, bifunctional catalyst, Ce, La

LIU Ping, YAO Yue, ZHANG Xingguang, WANG Jun. Rare Earth Metals Ion-exchanged β-Zeolites as Supports of Platinum Catalysts for Hydroisomerization of n-Heptane[J]. , 2011, 19(2): 278-284.

刘平, 姚月, 张兴光, 王军. Rare Earth Metals Ion-exchanged β-Zeolites as Supports of Platinum Catalysts for Hydroisomerization of n-Heptane[J]. , 2011, 19(2): 278-284.

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