Abstract
The Al-pillared clay (Al-P) was prepared by insertion of [AlO4Al12(OH)24(H2O)12]7+ clusters into the interlayer of montmorillonite clay and subsequent thermal activation. Al-pillared clay was used as an efficient inorganic matrix for dispersion of Pd-Ni bimetallic nanoparticles. The bimetallic nanoparticles were synthesized using chemical reduction method. The supported bimetallic catalysts were characterized using XRD, IR, UV–vis, TGA, sorptometric, FE-SEM-EDX and TEM techniques. The expansion of the interlayer space of the parent clay as a result of pillaring and its subsequent retention in the Pd-Ni/Al-P system was noted from XRD study. The structural integrity as well as electronic environment of the pillars and supported metal particles has been inferred from the FTIR and UV–vis study. FE-SEM study implies changes in morphological feature of the clay materials upon pillaring and dispersion of the bimetallic nanoparticles. The TEM study of the supported bimetallic system indicated well dispersion of the metal species with particle size in the range of 10–25nm. The Pd-Ni/Al-P system was used as an efficient heterogeneous catalyst for hydrodechlorination of chloroanilines under hydrogen transfer condition using hydrazine hydrate as hydrogen donating agent. The catalytic studies indicated that the bimetallic Pd-Ni system supported over Al-P is highly active for the reaction. The effect of various reaction parameters such as molar ratio of metallic components, temperature, and time, type of hydrogen transfer agents and functionality of substrate was studied in details.
Published Version
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