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  • Carbon Nanotubes as Support in the Platinum-Catalyzed Hydrolytic Dehydrogenation of Ammonia Borane.

Carbon Nanotubes as Support in the Platinum-Catalyzed Hydrolytic Dehydrogenation of Ammonia Borane.

ChemSusChem (2015-06-11)
Wenyao Chen, Xuezhi Duan, Gang Qian, De Chen, Xinggui Zhou
ABSTRACT

We report remarkable support effects for carbon nanotubes (CNTs) in the Pt/CNT-catalyzed hydrolytic dehydrogenation of ammonia borane. The origin of the support-dependent activity and durability is elucidated by combining the catalytic and durability testing with characterization by a range of spectroscopy and high-angle annular dark-field scanning transmission electron microscopy techniques and ICP analysis. The effects mainly arise from different electronic properties and different abilities for the adsorption of boron-containing species on platinum surfaces and changes in size and shape of the platinum particles during the reaction. Defect-rich CNTs in particular are a promising support material, as it not only enhances the platinum binding energy, leading to the highest hydrogen generation rate, but also inhibits the adsorption of boron-containing species and stabilizes the platinum nanoparticles to resist the agglomeration during the reaction, leading to the highest durability. The insights revealed herein may pave the way for the rational design of highly active and durable metal/carbon catalysts for the hydrolytic dehydrogenation of ammonia borane.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Boron, ≥95% (boron), amorphous powder
Sigma-Aldrich
Boron, crystalline, −60 mesh, 99% trace metals basis
Sigma-Aldrich
Boron, crystalline, 1 cm, 99.7% trace metals basis
Boron, monofilament, 10m, diameter 0.1mm
Boron, monofilament, 10m, diameter 0.2mm
Boron, monofilament, 200m, diameter 0.1mm
Boron, monofilament, 50m, diameter 0.2mm
Boron, monofilament, 5m, diameter 0.2mm
Boron, monofilament, 20m, diameter 0.1mm
Boron, monofilament, 20m, diameter 0.2mm
Boron, monofilament, 50m, diameter 0.1mm
Boron, monofilament, 5m, diameter 0.1mm