@article {46737,
	title = {TiO2-based water-tolerant acid catalysis for biomass-based fuels and chemicals},
	journal = {ACS Catalysis},
	volume = {10},
	year = {2020},
	month = {AUG},
	pages = {9555-9584},
	type = {Review},
	abstract = {<p>Solid acid catalysts alone or in combination with redox metals play a pivotal role in biomass valorization to obtain alternative fuels and chemicals. In acid-catalyzed biomass conversions, water is a key reagent/byproduct that can induce leaching/poisoning of catalyst{\textquoteright}s acid species, a major problem toward catalyst recyclability and product purification. Thus, developing efficient water-tolerant solid acid catalysts is vital for viable biomass valorization. TiO2 is considered to be a promising water-tolerant solid acid catalyst for biomass conversions because of the presence of coordinatively unsaturated Ti4+ sites, which are robust and less prone to leaching in the aqueous medium. Besides, the synergistic combination of TiO2 with redox metals (Ru, Pd, Ni, Cu, etc.) provides abundant bifunctional acid-redox sites, which exhibit a favorable catalytic role in the deoxygenation of biomass molecules to practically useful hydrocarbons. Therefore, this review provides an overview of recent progress toward TiO2-based water-tolerant acid catalysis for biomass conversion, with a focus on hydrothermal stability of TiO2, its acidity, and catalysts{\textquoteright} synthesis methods. Various biomass conversions over TiO2-based catalysts, where water-tolerant acid sites or acid-redox dual sites show a significant catalytic effect, were discussed. Structure-activity relationships based on water-tolerant Lewis acidity of TiO2 were emphasized. We believe that this review will provide valuable information for developing efficient water-tolerant solid acid catalysts not only for biomass valorization but also for other challenging reactions in the aqueous medium.</p>
},
	keywords = {Acid catalysis, acid-redox catalysis, Biomass conversion, renewable fuels and chemicals, TiO2-based catalysts, water-tolerant Lewis acidity},
	issn = {2155-5435},
	doi = {10.1021/acscatal.0c01680},
	author = {Sudarsanam, Putla and Li, Hu and Sagar, Tatiparthi Vikram}
}
@article {46692,
	title = {Towards lignin-derived chemicals using atom-efficient catalytic routes},
	journal = {Trends in Chemistry},
	volume = {2},
	year = {2020},
	month = {OCT},
	pages = {898-913},
	type = {Review},
	abstract = {<p>Lignin is a potential non-fossil resource of diverse functionalized phenolic units. The most important lignin- derived monomers are 4-alkylphenols, 4- hydroxybenzaldehydes, 4-hydroxybenzoic acids, and 4-hydroxycinnamic acids/esters. Efficient transformation of lignin and/or its monomers into valuable aromatics and their derivatives is crucial, not only for a sustainable lignocellulose biorefinery, but also to reduce our dependence on fossil feedstocks. This review provides a concise account of the recent advances in lignocellulose fractionation/lignin depolymerization processes towards lignin-derived monomers. Subsequently, numerous potential atom-efficient catalytic routes for upgrading lignin monomers into drop-in chemicals and new polymer building blocks are discussed.</p>
},
	doi = {10.1016/j.trechm.2020.07.011},
	author = {Sudarsanam, Putla and Ruijten, Dieter and Liao, Yuhe and Renders, Tom and Koelewijn, Steven-Friso and Sels, Bert F.}
}
