Solvent-free iridium-catalyzed CO2 hydrosilylation: experiments and kinetic modeling

E. A. Jaseer; Muhammad N. Akhtar; Mogahid Osman; A. Al-Shammari; Habeebllah B. Oladipo; Karin Garcés; Francisco J. Fernández-Alvarez; Sulaiman Al-Khattaf; Luis A. Oro

doi:10.1039/C4CY00815D

Solvent-free iridium-catalyzed CO₂ hydrosilylation: experiments and kinetic modeling†

E. A. Jaseer,^a Muhammad N. Akhtar,^a Mogahid Osman,^a A. Al-Shammari,^a Habeebllah B. Oladipo,^a Karin Garcés,^b Francisco J. Fernández-Alvarez,*^b Sulaiman Al-Khattaf*^a and Luis A. Oro*^ab

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* Corresponding authors

^a Center of Research Excellence in Petroleum Refining & Petrochemicals, King Fahd University of Petroleum & Minerals, 31261 Dhahran, Saudi Arabia
E-mail: skhattaf@kfupm.edu.sa

^b Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza-CSIC, Facultad de Ciencias 50009, Zaragoza, Spain
E-mail: oro@unizar.es, paco@unizar.es

Abstract

The iridium(III) complex [Ir(H)(CF₃SO₃)(NSiN)(coe)] (NSiN = bis(pyridine-2-yloxy)methylsilyl, coe = cyclooctene) has been demonstrated to be an active catalyst for the solvent-free hydrosilylation of CO₂ with 1,1,1,3,5,5,5-heptamethyltrisiloxane (HMTS) under mild reaction conditions (3 bar). The activity of this catalytic system depends on the reaction temperature. The best catalytic performance has been achieved at 75 °C. A kinetic study at variable temperature (from 25 °C to 75 °C) and constant pressure (3 bar) together with kinetic modeling has been carried out. The results from such a study show an activation energy of 73.8 kJ mol⁻¹ for the process.

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Article information

DOI: https://doi.org/10.1039/C4CY00815D
Article type: Paper
Submitted: 24 Jun 2014
Accepted: 30 Jul 2014
First published: 30 Jul 2014
This article is Open Access

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Catal. Sci. Technol., 2015,5, 274-279

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Solvent-free iridium-catalyzed CO₂ hydrosilylation: experiments and kinetic modeling

E. A. Jaseer, M. N. Akhtar, M. Osman, A. Al-Shammari, H. B. Oladipo, K. Garcés, F. J. Fernández-Alvarez, S. Al-Khattaf and L. A. Oro, Catal. Sci. Technol., 2015, 5, 274 DOI: 10.1039/C4CY00815D

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Catalysis Science & Technology