Abstract
Pillared clay-supported NiMo catalysts were synthesized in their reduced and sulfided forms and applied to the hydrodeoxygenation of guaiacol (2-methoxyphenol) as a bio-oil model compound. The sulf...
Highlights
Carbon dioxide emissions from fossil fuels and their associated climate change are driving the need for cleaner and more sustainable energy supplies.[1]
Bio-oil is a promising precursor of biofuel, which is readily obtained from the pyrolysis of lignocellulosic biomass, maintaining a closed carbon cycle.[4−6] The high content of oxygenated molecules in the bio-oil remains a problem that results in low heating values, chemical and thermal instability, and immiscibility with hydrocarbon fuels
In the NiMo catalysts, the d(001) peak is wide and has low intensity, indicating that the material is not well ordered and the interlaminar structure was modified when Ni and Mo are introduced. This was observed in cases of Ce- and La-modified Pillared clays (PILC) calcined at high temperatures.[42]
Summary
Carbon dioxide emissions from fossil fuels and their associated climate change are driving the need for cleaner and more sustainable energy supplies.[1]. Carbon is deposited in the form of polyaromatic species that block the active sites of the catalyst, and the coking strongly depends on the type of feed and acidity of the catalysts support For this reason, a detailed understanding of the interaction between phenolic compounds contained in bio-oil on the surface of the catalyst is an important factor in achieving a selective and durable catalyst for HDO. Popov et al studied the adsorption of various phenolic type compounds such as phenol, anisole, and GUA, on oxidic supports using infrared (IR) spectroscopy.[25,26] The interaction of these adsorbates on silica was observed to be mainly H-bonding, whereas chemisorption via the formation of a strongly held carbonaceous species in the form of phenates was found in the case of alumina. Quasielastic neutron scattering (QENS) measurements were performed to evaluate the diffusion and dynamics of the adsorbate on the catalyst, and INS spectroscopy was carried out, together with an IR study, in order to understand the details of the interaction between GUA and the NiMo-PILC catalysts
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