Release time:2021-03-15 Hits:
- 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.<sup>82Lmin-1</sup>gcatalyst-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<sup>-1</sup>).<br/> © 2015 Hydrogen Energy Publications, LLC.
- Volume:40
- Issue:25
- Translation or Not:no
