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Key Words:Cobalt alloys;Activation energy - Alumina - Aluminum alloys - Aluminum oxide - Atomic emission spectroscopy - Catalyst activity - Deposition - Electroless plating - Gas adsorption - Hydrogen production - Hydrolysis - Inductively coupled plasma - Nitrogen plasma - Scanning electron microscopy - Sodium Borohydride - Sodium hydroxide - Spectrometers - X ray diffraction - X ray photoelectron spectroscopy - X ray spectrometers;Borohydride solutions - Catalyst preparation - Electroless deposition time - Energy dispersive x-ray spectrometers - Field emission scanning electron microscopes - Hydrogen generations - Inductively Coupled Plasma Atomic Emission Spectrometers - Nitrogen adsorption desorption isotherms

Abstract:Abstract Co-W-P alloy catalysts were prepared on γ-Al<inf>2</inf>O<inf>3</inf>supports by electroless deposition. Inductively coupled plasma atomic emission spectrometer(ICP-AES), field emission scanning electron microscope(SEM), energy dispersive X-ray spectrometer(EDS), X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS) and nitrogen adsorption-desorption isotherm were used to characterize the Co-W-P/γ-Al<inf>2</inf>O<inf>3</inf>catalysts. Hydrolysis of sodium borohydride solution to produce hydrogen was used as a probe reaction to evaluate the catalytic activity of the obtained catalysts. The influences of catalyst preparation conditions such as CoSO<inf>4</inf>/Na<inf>2</inf>WO<inf>4</inf>concentration ratio in electroless bath, electroless deposition time and hydrolysis reaction conditions such as NaOH and NaBH<inf>4</inf>concentrations, the amount of catalysts used and reaction temperature on the hydrogen generation rate were investigated in the paper. The results show that the obtained Co-W-P/γ-Al<inf>2</inf>O<inf>3</inf>catalysts exhibit excellent catalytic activity, the highest hydrogen generation rate can reach 11.^82Lmin-1gcatalyst-1. The Co-W-P/γ-Al<inf>2</inf>O<inf>3</inf>catalysts also exhibit favorable cycling performance and lower activation energy (49.58 kJ mol^-1).<br/> © 2015 Hydrogen Energy Publications, LLC.

Volume:40

Issue:25

Translation or Not:no

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