@article {49908,
	title = {Hydrodeoxygenation of guaiacol to cyclohexanol using noble metal-supported Ni-based perovskite-derived catalysts},
	journal = {ChemCatChem},
	volume = {17},
	year = {2025},
	month = {AUG},
	type = {Article},
	abstract = {<p>
	This study focuses on the role of noble metal-doped Ni-based perovskites, specifically LaNiO3 and NiTiO3 catalysts in the hydrodeoxygenation (HDO) of guaiacol. The findings demonstrate that reduced Ru-LaNiO3 catalyst achieved superior performance with 100\% guaiacol conversion and a 75\% selectivity toward cyclohexanol, compared to reduced Ru-NiTiO3, which achieved only 43\% conversion and 25\% cyclohexanol selectivity under identical conditions (240 degrees C, 30 bar H2, and 4 h). High-resolution transmission electron microscopic (HR-TEM) analysis reveals that LaNiO3-supported catalysts exhibit better metal dispersion and smaller nickel nanoparticle sizes compared to NiTiO3-supported counterparts. X-ray photoelectron spectroscopy (XPS) analysis shows that the reduction of nickel and noble metals is more facile on LaNiO3. Additionally, the O 1s XPS profile for reduced Ru-LaNiO3 indicates a higher proportion of lattice oxygen (OLat similar to 79\%) and a lower proportion of oxygen vacancies (OVac similar to 21\%) compared to other catalyst systems. The optimized OLat/OVac ratio is shown to be critical for the effective HDO of guaiacol. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) demonstrates a high HDO reaction rate using reduced Ru-LaNiO3 than reduced Ru-NiTiO3, with cyclohexanol formation attributed to the keto-enol tautomerization pathway. Overall, this study underscores the critical roles of oxygen vacancies, metal dispersion, and metal-metal oxide interactions in the HDO of guaiacol.</p>
},
	keywords = {Cyclohexanol, Guaiacol, Hydrodeoxygenation, In-situ DRIFT, Ni-based perovskites},
	issn = {1867-3880},
	doi = {10.1002/cctc.202500577},
	author = {Marimuthu, Prabu and Raja, Thirumalaiswamy and Vinu, Ravikrishnan}
}
