Enhanced catalytic performance of Pd‐Ga bimetallic catalysts for 2‐ethylanthraquinone hydrogenation

Abstract

A series of Pd and Pd‐Ga bimetallic catalysts were prepared by a co‐impregnation method for 2‐ethylanthraquinone (EAQ) hydrogenation to produce hydrogen peroxide. Compared with 0.6Pd catalyst, the hydrogenation efficiency of 0.6Pd1.2Ga catalyst (11.9 g L−1) increases by 32.2%, and the stability of 0.6Pd1.2Ga catalyst is also higher than that of 0.6Pd catalyst. The structures of the samples were determined by N2 adsorption–desorption, ICP, XRD, CO chemisorption, TEM, H2‐TPR, in situ CO‐DRIFTS and XPS. The results suggest that incorporation of Ga species improves Pd dispersion and generates a strong interaction between Ga2O3 and Pd interface or between Pd and support. DFT calculation results indicate that the strong adsorption of carbonyl group on Ga2O3/Pd interface facilitates the activation of EAQ and promotes the hydrogenation efficiency.

Microdispersion of Gas or Water in an Anthraquinone Working Solution for the H2O2 Synthesis Process Intensification

“…For the hydrogenation of anthraquinone, most scholars have focused on the catalyst performance, − and only a few reports have discussed the intensification of the process. , The process intensification is mainly achieved by enhancing the gas–liquid perturbance or increasing the contact surface area of the two phases. Wang et al attempted to increase the interfacial area between hydrogen and the working solution using a rotating packed bed to achieve active dispersion.…”