摘要
Cordierite monoliths coated with Pd-Fe/α-Al O 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) ·h ) (733 h ) than that of the granular catalyst (60.2 h ), which can be attributed to its honeycomb structure and the large pore sizes in the α-Al O washcoat which was accompanied with an even distribution of the active component in the coating layer along the monoliths channels.
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