Selective photoreduction of CO2 to CO in CO2-dissolved expanded liquid phase with heterogeneous CO2-philic Pd complex catalysts

Authors:  R. Liu, H. Yoshida, S. Fujita, N. Lu, W.H. Tu, M. Arai

Abstract:
Novel CO₂-philic Pd complexes, PdCl₂[4,4'-bis(R_fCH2OCH₂)-2,2'-bpy] (bpy: 2,2'-bipyridine) where R_f = nC₁₀F₂₁, n-C₁₁F₂₃, were anchored onto a silica support modified with long fluorinated hydrocarbon chains (C₆F₁₃) by mixing these complex and the support in DMSO at 413K. These immobilized Pd complex catalysts were applied for the photoreduction of CO₂ in DMF or organic solvents using triethylamine as a hydrogen donor at 323K. The rate of CO₂ reduction and the selectivity to CO were observed to depend on several factors including CO₂ pressure, solvent, Pd complex structure, and Pd loading. With the most active catalyst, the selective photoreduction of CO₂ to CO can be achieved in DMF at a CO₂ pressure of 4 MPa and the performance observed is much better compared to the literature results. The features of the supported Pd complexes and the multiphase reaction media were characterized by UV–vis absorption and others to discuss the reasons for their high performance.

Keywords:
Heterogeneous catalysis
Palladium
Reduction
Catalyst design
Photocatalysis
Expanded liquid

Published in: Applied catalysis A: General  (Volume 455, Pages 1-266, 30 March 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Selective photoreduction of CO2 to CO in CO2-dissolved expanded liquid phase with heterogeneous CO2-philic Pd complex catalysts

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