@article {48313,
	title = {Nitric acid free cyclohexane to adipic acid production using nickel and vanadium incorporated AlPO-5 molecular sieve},
	journal = {Molecular Catalysis},
	volume = {540},
	year = {2023},
	month = {APR },
	pages = {113051},
	type = {Article},
	abstract = {<p>
	Rationally designing a stable and sustainable metal oxide supported over the molecular sieve catalysts for oxidizing cyclohexane (CYH) to adipic acid (AA) is vital in industrial applications. The in-situ hydrothermal synthesis method successfully incorporated vanadium and nickel into the aluminium phosphate-5 (AlPO-5) molecular sieves (MFI structure). The XPS and NH3 TPD analysis disclosed that the addition of Ni into V-AlPO-5 stabilizes the ratio of V4+/V5+, creating strong acidic sites and the formation of NiOOH, which are a vital role for the selective CYH oxidation to AA. An in-situ DRIFT study reveals that nickel takes part in the formation of dicarboxylate ions as an intermediate to form AA. Our catalytic studies profoundly suggested that the Ni0.1V0.2AlPO-5 catalyst used for CYH oxidation gives better selectivity towards AA (53\%) in the presence of oxygen at an appropriate amount of solvent without an initiator or promoter within a short time (3h).</p>
},
	keywords = {Adipic Acid, Cyclohexane oxidation, In situ DRIFT, NiOOH, NiVAlPO-5, Ratios ofV4+, V5+},
	issn = {2468-8231},
	doi = {10.1016/j.mcat.2023.113051},
	author = {Prabu, Marimuthu and Sharma, Shweta and Raja, Abhishekram and Archana, Ramakrishnan and Samruddhi, Mane and Raja, Thirumalaiswamy}
}
@article {49313,
	title = {New insights into the composition and catalytic performance of VOx-Ga/γ-Al2O3 for the oxidative dehydrogenation of propane to propene},
	journal = {New Journal of Chemistry},
	volume = {48},
	year = {2024},
	month = {AUG },
	pages = {15077-15087},
	type = {Article},
	abstract = {<p>
	Oxidative dehydrogenation (ODH) of propane is a promising alternative route for propene production. In this work, we developed a series of vanadium and gallium oxides supported on gamma-Al2O3 catalysts by an incipient wetness impregnation method. Among the employed catalysts, the VGA-2 showed superior catalytic activity, and the catalyst was demonstrated for longevity in ODH of propane with a stable activity using a continuous flow fixed bed reactor at 400 degrees C. H-2-TPR and UV-visible spectra showed the presence of highly dispersed monomeric VOx species with tetrahedral coordination geometry, which influences product selectivity. The characterization results also conferred that the redox nature of vanadium (V5+ and V4+) oxide and higher V5+ content on the surface of the VGA-2 catalysts are more favourable for C-H activation. In addition, the pyridine-FTIR and Ga-71 solid-state NMR studies further substantiated the presence of Lewis acid sites and tetrahedrally coordinated Ga3+Ox species that are highly responsible for the ODHP activity, respectively. Furthermore, in situ-DRIFTS studies conferred that the propane adsorption at ambient temperature showed the formation of intermediate propoxide species with the evolution of sigma-bonds and with further increase in the temperature to 325 degrees C; the stretching vibrations of the =C-H and -C-H bonds in the propylene molecule were observed. The spent catalysts were also analyzed by thermogravimetric analysis, where the optimized catalyst (VGA-2) showed the least coke deposition.</p>
},
	issn = {1144-0546},
	doi = {10.1039/d3nj05109a},
	author = {Kandasamy, Prabu and Gawali, Sheetal and Venugopalan, Aswathy Thareparambil and Manikandan, Marimuthu and Mekala, Siva Prasad and Shelke, Ankita and Ajithkumar, Thalasseril G. and Bhatte, Kushal and Raja, Thirumalaiswamy}
}
