Supported CoCl_2 catalyst for NaBH_4 dehydrogenation

摘要

In this paper, economically favorable, supported CoCl_2 catalysts were produced for NaBH_4 dehydrogenation. Among the used supports, diatomite and γ-Al_2O_3 supports show great stability with CoCl_2 and do not break up during experiments some of which lasts 3000 min. Slow and continuous hydrogen release throughout all of the experiments is observed. Furthermore, prepared catalyst could be used for 250 h uninterruptedly. XRF and Atomic Absorption Spectrometer (AAS) analysis prove that CoCl_2 could be permanently joined and distributed homogeneously on the support surface. In addition, kinetic investigations of the dehydrogenation reaction fit zero order kinetic for low temperatures while it obeys the first order at high temperature. Computation of activation energy results 132 kJ/mol for low and 78 kJ/ mol for high temperature regions.