Jump to main content
Jump to site search

Issue 17, 2017
Previous Article Next Article

Active Pd(II) complexes: enhancing catalytic activity by ligand effect for carbonylation of methyl nitrite to dimethyl carbonate

Author affiliations

Abstract

Palladium (Pd)-based catalysts have been widely used for carbonylation of methyl nitrite to dimethyl carbonate (DMC), but a high-performance chloride free catalyst combining both excellent carbon monoxide (CO) conversion and DMC selectivity has not been developed yet. In this work, a chloride free, Pd-based catalyst with good activity and selectivity (conversion of CO: 60.1%, selectivity to DMC: 99.9%) has been successfully fabricated. By thorough characterization and analysis, it is found that the good catalytic activity is positively correlated with the high oxidation states of the Pd species, which could be tuned by their ability to accept the backdonation electron of the ligands. The strong electron backdonation from Pd to π* antibonding orbitals of the ligand in the palladium acetylacetonate [Pd(acac)2] complex accelerates the step where Pdδ+ reoxidizes to Pd(II), resulting in the higher catalytic activity. In addition, a catalytic mechanism was proposed based on the results of X-ray photoelectron spectroscopy and in situ diffuse reflectance infrared spectroscopy. This work not only explains the positive relationship between the catalytic activity and the oxidation state of the Pd species, but also provides a new way to enhance catalytic performance by utilizing the abilities of accepting the backdonation electron of the ligands.

Graphical abstract: Active Pd(ii) complexes: enhancing catalytic activity by ligand effect for carbonylation of methyl nitrite to dimethyl carbonate

Back to tab navigation

Supplementary files

Publication details

The article was received on 30 Jun 2017, accepted on 17 Jul 2017 and first published on 19 Jul 2017


Article type: Paper
DOI: 10.1039/C7CY01305A
Citation: Catal. Sci. Technol., 2017,7, 3785-3790
  •   Request permissions

    Active Pd(II) complexes: enhancing catalytic activity by ligand effect for carbonylation of methyl nitrite to dimethyl carbonate

    H. Tan, Z. Wang, Z. Xu, J. Sun, Z. Chen, Q. Chen, Y. Chen and G. Guo, Catal. Sci. Technol., 2017, 7, 3785
    DOI: 10.1039/C7CY01305A

Search articles by author

Spotlight

Advertisements