Various Rate Law Orders Through Hydrolysis of Sodium Borohydride Over Co-M-Zr-B (M= Cr, Mo and W) Nano Catalyst

Various Rate Law Orders Through Hydrolysis of Sodium Borohydride Over Co-M-Zr-B (M= Cr, Mo and W) Nano Catalyst

Mohammad Hassan Loghmani (Department of Nanotechnology, University of Guilan, Rasht, Iran)
DOI: 10.4018/IJCCE.2017070104

Abstract

This article describes a Group (VI) modified Co-Zr-B amorphous nano alloys were prepared in situ ultrasound-assisted reduction by sodium borohydride in an aqueous solution. Co-Cr-Zr-B, Co-Mo-Zr-B and Co-W-Zr-B powders were characterized by XRD, FESEM, BET and ICP techniques. No distinct peak could be observed in XRD patterns of the obtained catalysts indicating that all samples possessed amorphous structure. Indeed, it was not seen any metal oxide phase. Obtained powders are highly active catalysts for hydrogen generation from the hydrolysis of sodium borohydride. The reported work also includes the full experimental details for the collection of a wealth of kinetic data to determine the activation energy and effects of the catalyst dosage, amount of NaBH4, and temperature on the rate of the catalytic hydrolysis of sodium borohydride. Rate law orders of all catalysts were calculated from an Arrhenius plot of each catalyst.
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1. Introduction

At the present time, there is a significant interest in the study and use of metal nanoclusters because of their novel and attractive physical and chemical properties (Schmid, 1992). For example, transition metal nanoclusters have been studied as catalysts in various organic and inorganic reactions (Weddle, Aiken, & Finke, 1998). Recently, sodium borohydride has been suggested as a new fuel source for supplying hydrogen under mild conditions (Amendola, Sharp-Goldman, Janjua, Spencer et al., 2000). NaBH4 yields hydrogen gas and water-soluble sodium metaborate, NaBO2, upon hydrolysis in the presence of certain catalysts (Equation (1)):

NaBH4 +2H2ONaBO2+4H2(1)

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