Controlled preparation and characterization of plurimetallic Pt–Sn and Pt–Ir–Sn/Al2O3 reforming catalysts

International audienceThe preparation of bimetallic 0.6 wt.% Pt–xwt.% Sn/Al2O3and trimetallic 0.5 wt.% Pt–0.1 wt.% Ir–xwt.% Sn/Al2O3and 0.3 wt.%Pt–0.3 wt.% Ir–xwt.% Sn/Al2O3catalysts (0<x<0.4) by surface redox reaction between hydrogen activated on a parent platinum orplatinum–iridium catalyst and tin chloride (SnCl4) dissolved in hydrochloric medium (‘‘catalytic reduction’’ method) was investigated.Elemental analysis of catalysts indicated that tin can be deposited by surface redox reaction, this reaction competing with the adsorption of thetin precursor on the alumina support. The deposition on the metal by redox reaction being more rapid than the one on the support by exchange,the reaction time was limited to 15 min. Moreover, the addition of citric acid in the acidic medium allowed to decrease both the tin deposit on thesupport and the chloride content of the catalysts. The characterization of tin modified catalysts by temperature programmed reduction and byactivity measurements for cyclohexane dehydrogenation showed that a large amount of tin is deposited on or close to the active metallic phase

Characterization of the production regions of Chardonnay wines by analysis of free amino acids

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Enthalpy recovery of gases issued from H2 production processes: Activity and stability of oxide and noble metal catalysts in oxidation reaction under highly severe conditions

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Effect of Indium Doping of γ\gamma-Alumina on the Stabilization of PtSn Alloyed Clusters Prepared by Surface Organostannic Chemistry

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