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Effects of heavy rare earth addition on properties of KL zeolite-supported platinum reforming catalyst

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Effects of heavy rare earth addition on properties of KL zeolite-supported platinum reforming catalyst

Auteurs : Xiangming Fang [République populaire de Chine] ; Fengyi Li [République populaire de Chine] ; Qiang Zhou [République populaire de Chine] ; Laitao Luo [République populaire de Chine]

Source :

Applied Catalysis A: General [ 0926-860X ] ; 1997.

RBID : ISTEX:EDBF9999004D469BFF2D3A0F38D775E796D6FE63

English descriptors

Abstract

Abstract: A series of PtREKL catalysts, which containing 0.8 wt% platinum and 0.2 wt% RE (REGd, Tb, Dy, Tm, Yb, Lu), have been prepared by impregnation of the L-type zeolite support with corresponding RE nitrate aqueous solutions. The reforming reactions of n-hexane, cyclohexane and methylcyclopentane (MCP) on PtREKL catalysts have been investigated with a plus microcatalytic apparatus. The surface properties and the active sites of these catalysts have also been studied with TPD, TPR and plus-CS2 poisoning test. Our results reveal that those heavy rare earth elements added to PtKL catalyst have effect of electronic donation to Pt particles and blocking the accumulation of active Pt particles, and thus can remarkably increase the ability of resistant sulfur poisoning and the aromatic selectivity of n-hexane or MCP conversion on the PtKL catalyst. Studies on the relationship between the magnetic properties of catalysts and the activities as well as selectivity of catalysts show that after addition of the RE, the magnetic susceptibilities of PtREKL catalysts decrease dramatically compared with that of PtKL catalyst, while catalytic properties of PtREKL catalysts are improved, which suggests that the unpaired electron numbers of Pt particles are decreased by RE2O3's giving electrons to Pt particles, therefore electronic property of catalysts is one of the most important factors affecting the activity of PtREKL catalysts.

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https://api.istex.fr/document/EDBF9999004D469BFF2D3A0F38D775E796D6FE63/fulltext/pdf

DOI: 10.1016/S0926-860X(97)00072-0

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<term>Catalysis</term>
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<term>Same catalyst</term>
<term>Selectivity</term>
<term>Strong adsorption sites</term>
<term>Sulfur</term>
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<term>Aqueous solution</term>
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<term>Aromatic selectivity</term>
<term>Aromatization</term>
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<term>Carbon ring</term>
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<term>Catalysis</term>
<term>Catalyst</term>
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<term>Catalysts decrease</term>
<term>Catalysts show</term>
<term>Catalytic activity</term>
<term>Catalytic properties</term>
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<term>Cyclohexane dehydrogenation</term>
<term>Dehydrogenation</term>
<term>Different kinds</term>
<term>Dispersity</term>
<term>Earth elements</term>
<term>Electronic donation</term>
<term>Electronic structure</term>
<term>Experimental conditions</term>
<term>Experimental results</term>
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<term>Ferromagnetic impurities</term>
<term>Flow velocity</term>
<term>Form compound</term>
<term>Heating rate</term>
<term>Higher selectivity</term>
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<term>Kinetic parameters</term>
<term>Lower susceptibilities</term>
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<term>Magnetic susceptibilities</term>
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<term>Peak temperatures</term>
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<term>Rare earth elements</term>
<term>Reaction temperature</term>
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<term>Selectivity</term>
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<front><div type="abstract" xml:lang="en">Abstract: A series of PtREKL catalysts, which containing 0.8 wt% platinum and 0.2 wt% RE (REGd, Tb, Dy, Tm, Yb, Lu), have been prepared by impregnation of the L-type zeolite support with corresponding RE nitrate aqueous solutions. The reforming reactions of n-hexane, cyclohexane and methylcyclopentane (MCP) on PtREKL catalysts have been investigated with a plus microcatalytic apparatus. The surface properties and the active sites of these catalysts have also been studied with TPD, TPR and plus-CS2 poisoning test. Our results reveal that those heavy rare earth elements added to PtKL catalyst have effect of electronic donation to Pt particles and blocking the accumulation of active Pt particles, and thus can remarkably increase the ability of resistant sulfur poisoning and the aromatic selectivity of n-hexane or MCP conversion on the PtKL catalyst. Studies on the relationship between the magnetic properties of catalysts and the activities as well as selectivity of catalysts show that after addition of the RE, the magnetic susceptibilities of PtREKL catalysts decrease dramatically compared with that of PtKL catalyst, while catalytic properties of PtREKL catalysts are improved, which suggests that the unpaired electron numbers of Pt particles are decreased by RE2O3's giving electrons to Pt particles, therefore electronic property of catalysts is one of the most important factors affecting the activity of PtREKL catalysts.</div>
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Effects of heavy rare earth addition on properties of KL zeolite-supported platinum reforming catalyst

Effects of heavy rare earth addition on properties of KL zeolite-supported platinum reforming catalyst

Source :

English descriptors

Abstract

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