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

Jari Kiviaho; Marita Niemelä; Yoshio Morioka; Kirsi Kataja

doi:10.1016/0926-860X(96)00126-3

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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Abstract

he decarbonylation of Co_4−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 language	English
Pages (from-to)	93-109
Number of pages	17
Journal	Applied Catalysis A: General
Volume	144
Issue number	1-2
DOIs	https://doi.org/10.1016/0926-860X(96)00126-3
Publication status	Published - 1996
MoE publication type	A1 Journal article-refereed

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@article{fef7421ddcdc49b9ac15a044db407ecf,

title = "TPR and FT-IR studies on carbonyl cluster derived Co-Rh/SiO2 catalysts",

abstract = "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.",

author = "Jari Kiviaho and Marita Niemel{\"a} and Yoshio Morioka and Kirsi Kataja",

year = "1996",

doi = "10.1016/0926-860X(96)00126-3",

language = "English",

volume = "144",

pages = "93--109",

journal = "Applied Catalysis A: General",

issn = "0926-860X",

publisher = "Elsevier",

number = "1-2",

}

TY - JOUR

T1 - TPR and FT-IR studies on carbonyl cluster derived Co-Rh/SiO2 catalysts

AU - Kiviaho, Jari

AU - Niemelä, Marita

AU - Morioka, Yoshio

AU - Kataja, Kirsi

PY - 1996

Y1 - 1996

N2 - 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.

AB - 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.

U2 - 10.1016/0926-860X(96)00126-3

DO - 10.1016/0926-860X(96)00126-3

M3 - Article

SN - 0926-860X

VL - 144

SP - 93

EP - 109

JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

IS - 1-2

ER -

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

Abstract

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