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Pd-Fe/α-Al2O3/cordierite monolithic catalysts for the synthesis of dimethyl oxalate: effects of calcination and structure
Received date: 26 Apr 2012
Accepted date: 06 Jun 2012
Published date: 05 Sep 2012
Copyright
Cordierite monoliths coated with Pd-Fe/α-Al2O3 catalysts were prepared at various calcination temperatures and characterized by thermogravimetry, temperature-programmed reduction, transmission electron microscopy, diffuse reflectance infrared Fourier transformation spectroscopy and X-ray diffraction. The performance of the catalytic monoliths for the synthesis of dimethyl oxalate (DMO) through a CO coupling reaction was evaluated. Monolithic catalysts with calcination temperatures ranging from 473 K to 673 K exhibited excellent dispersion of Pd, good CO adsorption properties, and excellent performance for the coupling reaction. The optimized monolithic catalyst exhibited a much higher Pd efficiency (denoted as DMO (g)·Pd (g)-1·h-1) (733 h-1) than that of the granular catalyst (60.2 h-1), which can be attributed to its honeycomb structure and the large pore sizes in the α-Al2O3 washcoat which was accompanied with an even distribution of the active component in the coating layer along the monoliths channels.
Key words: dimethyl oxalate; coupling; Pd; cordierite; monolith; calcination; structure
Shengping WANG , Xin ZHANG , Yujun ZHAO , Yadong GE , Jing LV , Baowei WANG , Xinbin MA . Pd-Fe/α-Al2O3/cordierite monolithic catalysts for the synthesis of dimethyl oxalate: effects of calcination and structure[J]. Frontiers of Chemical Science and Engineering, 2012 , 6(3) : 259 -269 . DOI: 10.1007/s11705-012-1212-6
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