Synthesis of hydrogen peroxide over Pd/SiO2/COR monolith catalysts by anthraquinone method

In this work, a series of Pd/SiO2/COR (cordierite) catalysts with different Pd contents were successfully prepared by impregnation method. The obtained Pd/SiO2/COR catalyst samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), BET, hydrogen temperature programmed reduction (H-2-TPR), inductively coupled plasma-atomic emission spectrometry (ICP-AES), and X-ray photoelectron spectroscopy (XPS). X-ray photoelectron spectroscopy (XPS) show that Pd element is mainly in the state of PdO, and 1.5% Pd/SiO2/COR catalyst with the theoretical Pd content of 1.5% has the most Pd content on the monolith channel surface when compared to other Pd content monolith catalysts in this paper. Then in the experiment it was found the optimum catalyst is 1.5% Pd/SiO2/COR, which is consistent with XPS results. The STY cad achieve 793.2 g H2O2 g(-1) Pd h(-1) over 1.5% Pd/SiO2/COR catalyst. (C) 2016 Elsevier B.V. All rights reserved.