Porous PdO-Flower Induced by Nanomicrostructure on Monolith with Traditional Immersion-Pyrolysis Technique for Hydrogenation

Abstract

Monolith catalysts fabricated with the immersion-pyrolysis technique suffer the uncontrollable morphology of active component, leading to low conversion and reaction rates. Herein, we propose a strategy by introducing Co3O4 nanomicrostructure on Ni foam to induce the construction of porous flower-like PdO morphology. Investigations revealed the flower structure s originally formed during the solvent evaporation after immersing Co3O4/Ni in PdCl2 solution. The nanomicrostructure also restrained the spontaneous replacement of palladium ions to nickel atoms. Benefiting from these advantages, 0.51% PdO/Co3O4/Ni declared high catalytic reaction rate up to 9.44 mmol gPd –1 s–1 for α-methylstyrene (AMS) hydrogenation in a stirring tank reactor (STR) at 40 °C and 0.5 MPa of H2, 29.5 times superior to that of 5.99% PdO y /Ni. In a mass-transfer-enhanced rotating packed bed reactor, the modified monolith catalyst also exhibited slightly boosted AMS conversion and reaction rate than that in STR, demonstrating the flexible applicability prospects for various reactors.

Preparation of Pd/Al2O3/Nickel Microfoam Catalysts by Electrodeposition for Hydrogenation in a Micropacked Bed Reactor

“…This indicated that the Al 2 O 3 coatings by ED have greater advantages for the improvement of the loading and dispersion of the active component Pd. The comparisons of turnover frequency (TOF) values of the catalysts by SC and ED of Al­(NO 3 ) 3 and Al 2 O 3 electrolytes in this work and PdO/Co 3 O 4 /Ni foam catalysts in the literature are summarized in Table S1. The order of TOF values of the catalysts in the MPB was ED of Al 2 O 3 > ED of Al­(NO 3 ) 3 > SC, which was consistent with the results of the catalyst activity.…”