Authors:
N. Das North Orissa University P. G. Department of Chemistry Takatpur, Baripada 757 003 Orissa India

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R. Das M. P. C. (A) College Department of Chemistry Baripada 757 003 Orissa India

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Abstract  

Quaternary hydrotalcite-like precursors containing Mg(II)Pd(II)Cu(II)Al(III) with (Pd + Cu + Mg)/Al ≈ 3 and varying Pd/Cu molar ratios were prepared by coprecipitation of metal nitrates at constant pH. The precursors and their calcined products were characterized by elemental analysis, powder XRD, TG-DTA, FT-IR diffuse reflectance, TPR and N2 physisorption. Powder XRD indicated the formation of hydrotalcite of good crystallinity as the structure for all the precursors; the crystallinity decreased with increase of Pd2+ and Cu2+ in the Mg–Al brucite like layer. Thermal decomposition of HT-precursors at intermediate temperatures led to amorphous mixed oxides, PdCu/MgAl(O), which on reduction yielded a bi-functional catalyst, Pd0Cu0/MgAl(O). The resulting catalysts with acid, base and hydrogenating sites were highly effective and selective for the one-step synthesis of methyl isobutyl ketone (MIBK) from acetone and hydrogen under mild conditions. Addition of copper with Pd inhibited the formation of hydrogenated by-products, propane-2-ol (IPA) and 4-methyl-pentane-2-ol (MIBA), which resulted an increase of MIBK selectivity and also the stability of the catalysts. A proper balance between acid-base and metallic sites was paramount for high catalytic performance.

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Reaction Kinetics, Mechanisms and Catalysis
Language English
Size B5
Year of
Foundation
1974
Volumes
per Year
1
Issues
per Year
6
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1878-5190 (Print)
ISSN 1878-5204 (Online)