TPR and FT-IR studies on carbonyl cluster derived Co-Rh/SiO2 catalysts

Jari Kiviaho (Corresponding Author), Marita Niemelä, Yoshio Morioka, Kirsi Kataja

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    he decarbonylation of Co4−nRhn(CO)12/SiO2 and (Co4(CO)12 +Rh4(CO)12)/SiO2 catalysts was studied by temperature programmed reduction (TPR) and in-situ diffuse reflectance FT-IR techniques. Special attention was paid to the effect of the decomposition atmosphere on the supported catalysts. The temperature of decarbonylation depended on the precursor, and the CO desorption peak maxima during the TPR were as follows: Co2Rh2(CO)12 = 123°C, Co3Rh(CO)12 = 125°C, (Co4(CO)12 + Rh4(CO)12) = 135°C, Co4(CO)12 = 137°C and Rh4(CO)12 = 178°C. The CO desorption was greatest for Co4(CO)12, and less and similar for other catalysts. Thus, from rhodium containing catalysts less CO was desorbed at elevated temperatures indicating a stronger interaction of rhodium than of cobalt with the support. Correspondingly, according to FT-IR measurements, the stability of the tetranuclear carbonyls supported on silica decreased in the order Co4(CO)12 > bimetallic carbonyls > Rh4(CO)12 at room temperature.
    Original languageEnglish
    Pages (from-to)93-109
    Number of pages17
    JournalApplied Catalysis A: General
    Issue number1-2
    Publication statusPublished - 1996
    MoE publication typeA1 Journal article-refereed


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