Effects of porous oxide layer on performance of Pd-based monolithic catalysts for 2-ethylanthraquinone hydrogenation

doi:10.1016/j.cjche.2016.04.032

Abstract

Abstract: Pd/oxide/cordieritemonolithic catalysts (oxide=Al₂O₃, SiO₂ and SiO₂-Al₂O₃)were prepared by the impregnation method. The results of ICP, XRD, SEM-EDX, XPS and N₂ adsorption-desorption measurements revealed that the Pd penetration depth increased with increasing the thickness of oxide layer, and the catalysts with Al₂O₃ layers had the larger pore size than those with SiO₂ and SiO₂-Al₂O₃ layers. Catalytic hydrogenation of 2-ethylanthraquinone (eAQ), a key step of the H₂O₂ production by the anthraquinone process, over the various monolithic catalysts (60℃, atmosphere pressure) showed that themonolithic catalystwith the moderate thickness of Al₂O₃ layer (about 6 μm) exhibited the highest conversion of eAQ (99.1%) and hydrogenation efficiency (10.0 g·L^-1). This could be ascribed to the suitable Pd penetration depth and the larger pore size,which provides a balance between the distribution of Pd and accessibility of active sites by the reactants.

Key words: Monolith, Catalyst, Hydrogenation, Anthraquinone, Hydrogen peroxide, Pd

摘要： Pd/oxide/cordieritemonolithic catalysts (oxide=Al₂O₃, SiO₂ and SiO₂-Al₂O₃)were prepared by the impregnation method. The results of ICP, XRD, SEM-EDX, XPS and N₂ adsorption-desorption measurements revealed that the Pd penetration depth increased with increasing the thickness of oxide layer, and the catalysts with Al₂O₃ layers had the larger pore size than those with SiO₂ and SiO₂-Al₂O₃ layers. Catalytic hydrogenation of 2-ethylanthraquinone (eAQ), a key step of the H₂O₂ production by the anthraquinone process, over the various monolithic catalysts (60℃, atmosphere pressure) showed that themonolithic catalystwith the moderate thickness of Al₂O₃ layer (about 6 μm) exhibited the highest conversion of eAQ (99.1%) and hydrogenation efficiency (10.0 g·L^-1). This could be ascribed to the suitable Pd penetration depth and the larger pore size,which provides a balance between the distribution of Pd and accessibility of active sites by the reactants.

关键词: Monolith, Catalyst, Hydrogenation, Anthraquinone, Hydrogen peroxide, Pd

Xin Shi, Enxian Yuan, Guozhu Liu, Li Wang. Effects of porous oxide layer on performance of Pd-based monolithic catalysts for 2-ethylanthraquinone hydrogenation[J]. Chin.J.Chem.Eng., 2016, 24(11): 1570-1576.

Xin Shi, Enxian Yuan, Guozhu Liu, Li Wang. Effects of porous oxide layer on performance of Pd-based monolithic catalysts for 2-ethylanthraquinone hydrogenation[J]. Chinese Journal of Chemical Engineering, 2016, 24(11): 1570-1576.

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