alexa Catalytic Hydrogenation of Carbon Dioxide
ISSN: 2161-0401
Organic Chemistry: Current Research
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Catalytic Hydrogenation of Carbon Dioxide

Soon Hyeok Hong*
Center for Nanoparticle Research, Institute for Basic Science and Department of Chemistry, College of Natural Sciences, Seoul National University, Korea
Corresponding Author : Soon Hyeok Hong
Center for Nanoparticle Research
Institute for Basic Science and Department of Chemistry
College of Natural Sciences
Seoul National University, Korea
Tel: 82-2-880-6655
Fax: 82-2-889-1568
E-mail: [email protected]
Received March 25, 2013; Accepted March 27, 2013; Published April 02, 2013
Citation: Hong SH (2013) Catalytic Hydrogenation of Carbon Dioxide. Organic Chem Curr Res 2:e119. doi: 10.4172/2161-0401.1000e119
Copyright: © 2013 Hong SH. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Among several greenhouse gases such as water vapor, methane, ozone, and nitrous oxide, anthropogenic carbon dioxide contributes to global warming most significantly. Chemists have considered recycling carbon dioxide as a renewable and environmentally friendly source of carbon to reduce our dependence on petrochemicals. However, there are only a few industrial processes that utilize CO2 because of its high kinetic and thermodynamic stability with high oxidation state of carbon.
The best way to overcome such difficulties could be transition metal-based catalysis. In recent years, many methods for catalytic conversion of CO2 have been developed. Among them, hydrogenation of CO2 to formic acid is an attractive approach, as formic acid serves as a versatile carbon source through many transformations in organic chemistry. Ru, Rh, Ir, and Fe complexes have been reported to be active for homogeneous catalytic hydrogenation of CO2. A PNP pincertype Ir (III) catalyst developed by Tanaka et al. exhibited the highest TON of 3,500,000 to date [1]. Despite this remarkable achievement, more economical and biorelevant metal-based catalytic systems are required. Fe-based CO2 hydrogenation catalysts recently developed independently by Beller [2] and Milstein [3] were highly attractive, but TONs are in the range of 508~5104, which requires significant improvement.
More promising solution to global energy problem is the hydrogenation of CO2 to produce methanol. Methanol is considered an excellent fuel for fuel cells and combustion engines [4]. Hydrogenation of CO2 to methanol has favorable thermodynamics, but high activation energy barriers should be overcome by appropriate catalysts. Heterogeneous catalysts have been actively investigated with some success, but still the conditions are too harsh with the requirement of high temperature and high pressure of CO2 and hydrogen. Homogeneous direct hydrogenation of CO2 to methanol is less efficient than heterogeneous catalysis and has been pursued especially with Ru catalysts [5,6]. Recently developed indirect routes to methanol from carbonates, readily available from CO2, are organic chemists’ notable approaches to the problem [7,8].
In summary, hydrogenation of chemically stable carbon dioxide is a highly attractive solution to the recycling of the carbon source. New concepts and approaches for the development of highly efficient and economical CO2 hydrogenation catalysts are long-awaited for the practical utilization of CO2 as a renewable carbon source.

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