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This research investigates how adding phosphorus affects the activity of palladium catalysts in the dehydrogenation of perhydrophenazine.

February 12, 2026

Study of the Phosphorus Promoting Effect on Palladium Alumina Catalysts for the Dehydrogenation of Perhydrophenazine

Key Points

This research investigates how adding phosphorus affects the activity of palladium catalysts in the dehydrogenation of perhydrophenazine.
Synthesis of palladium catalysts with varying phosphorus content (1-30 wt%)
Characterization using Brunauer-Emmett-Teller, X-Ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and CO chemisorption methods
Measurement of catalytic activity in dehydrogenation reactions at 200°C
Optimal phosphorus content of 10 wt% yields a hydrogen production of 76% at 200°C
Phosphorus addition increases specific surface area and alters palladium's electronic state
Higher phosphorus concentrations (>15%) reduce catalytic activity due to the blocking of active sites and decreased surface area

Abstract

The effect of phosphorus addition on the activity of palladium catalysts (1% Pd/AlO-xP, where x equals 1–30 wt%) in the dehydrogenation reaction of perhydrophenazine, a promising liquid organic hydrogen carrier (LOHC), was investigated. It is shown by Brunauer-Emmett-Teller method, X-Ray diffraction analysis, transmission electron microscopy, X-ray photoelectron spectroscopy and CO chemisorption methods that the addition of phosphorus changes the support structure, increasing the specific surface area and modifying the electronic state of palladium nanoparticles. Optimal phosphorus content (10 wt%) provides maximum catalytic activity (hydrogen yield 76% at 200°C) due to the formation of electron-deficient Pd centers and palladium phosphides. Further increase of phosphorus concentration (15%) decreases the activity due to blocking of active centers and decrease of specific surface area.

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