The Effects of AlPO-n Additives as Catalytic Support on Pd-Catalytic Hydrogenation of 2-Amylanthraquinone Process

The Pd-catalyzed hydrogenation of anthraquinone to synthesize hydrogen peroxide is an important process in the chemical industry. A Pd catalyst with high dispersion is the key to hydrogenation activity and selectivity. For the first time, this team introduced the AlPO-5 zeolite to SiO2 powder to prepare a finely dispersed Pd catalyst with higher efficiency than the conventional Pd/SiO2 catalyst. Based on previous research, other aluminophosphate molecular sieves (AlPO-n) with different properties from AlPO-5 were introduced to the SiO2 support, and then the synthesized hydrogenation catalysts were characterized by the BET, XRD, H2-TPR, NH3-TPD, H2-TPD, XPS and HRTEM methods and then tested for the hydrogenation of 2-amylanthraquinone in a continuous stirred tank reactor (CSTR). It was demonstrated that the Pd-AlPO-31/SiO2 catalyst exhibits superior H2O2 yield (8.4 g·L−1) and selectivity (96%) among all prepared Pd-AlPO-n/SiO2 and Pd/SiO2 catalysts. The characterization results suggest that the dimensions and structure of AlPO-31 micropore channels are responsible for highly dispersing Pd particles, preventing the accumulation of Pd particles, and intensifying H2 adsorption in its micropore channels, which is significant for the catalytic activity.