Effect of TiO2 in supported NiWS catalysts for the hydrodeoxygenation of guaiacol

García‐Mendoza, Cinthia; Santolalla-Vargas, C.E.; Woolfolk, Luis G.; Ángel, P. Del; Reyes, J. A.

doi:10.1016/j.cattod.2020.08.026

Cited by 18 publications

(4 citation statements)

References 64 publications

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“…Reasonably, the balance optimization of these two functionalities (i.e., the Brønsted and Lewis acidity) with modulation by metal substitutions, will further improve the HDO/alkylation selectivity of the catalyst. With the aim of finding an efficient and selective heterogeneous catalytic system for the HDO of phenolic compounds, several TiO 2 , ZrO 2 and TiO 2 -ZrO 2 mixed oxides supported NiW catalysts were recently studied in the HDO of guaiacol (ortho-hydroxyanisole, Scheme 2) [114]. The three tested supports, i.e., titania, zirconia and titania-zirconia mixed oxide (TZ(80/20)), besides the presence of Brønsted acid sites, they also exhibited more active basic sites (zirconia).…”

Section: Titaniamentioning

confidence: 99%

Support–Activity Relationship in Heterogeneous Catalysis for Biomass Valorization and Fine-Chemicals Production

et al. 2021

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Heterogeneous catalysts are progressively expanding their field of application, from high-throughput reactions for traditional industrial chemistry with production volumes reaching millions of tons per year, a sector in which they are key players, to more niche applications for the production of fine chemicals. These novel applications require a progressive utilization reduction of fossil feedstocks, in favor of renewable ones. Biomasses are the most accessible source of organic precursors, having as advantage their low cost and even distribution across the globe. Unfortunately, they are intrinsically inhomogeneous in nature and their efficient exploitation requires novel catalysts. In this process, an accurate design of the active phase performing the reaction is important; nevertheless, we are often neglecting the importance of the support in guaranteeing stable performances and improving catalytic activity. This review has the goal of gathering and highlighting the cases in which the supports (either derived or not from biomass wastes) share the worth of performing the catalysis with the active phase, for those reactions involving the synthesis of fine chemicals starting from biomasses as feedstocks.

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Section: Titaniamentioning

confidence: 99%

Support–Activity Relationship in Heterogeneous Catalysis for Biomass Valorization and Fine-Chemicals Production

et al. 2021

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“…According to some authors, HDO is a bifunctional process that involves a metallic site and an acid site. − Metallic particles are responsible for hydrogenation reactions, whereas dehydration, alkylation, and polymerization secondary reactions are catalyzed by acid sites. In previous works, some of us have reported direct correlations between acidity and the reaction rate for phenol and guaiacol . However, other authors have published that there was no correlation between activity and acidity for HDO reactions .…”

Section: Introductionmentioning

confidence: 97%

“…In previous works, some of us have reported direct correlations between acidity and the reaction rate for phenol 2 and guaiacol. 36 However, other authors have published that there was no correlation between activity and acidity for HDO reactions. 1 have been published regarding HDO and properties such as oxophilicity, reducibility, or capacity to generate oxygen vacancies.…”

Section: Introductionmentioning

confidence: 99%

Fundamental Study of Catalytic Functionalities Involved in Effective C–O Cleavage over Ru-Supported Catalysts

Valdés-Martínez

León²,

Santolalla

et al. 2021

Ind. Eng. Chem. Res.

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Catalytic hydrodeoxygenation (HDO) has been considered as a promising route for biomass revalorization. The development of active and stable materials has been undertaken over the past decade, and precious metals have displayed high activities. Ru has exhibited an outstanding performance due to its high hydrogenation capacity, among other properties. Rational development of these catalysts requires understanding the contribution of properties like acidity, oxophilicity, reducibility, and capacity to generate oxygen vacancies. However, the fundamental basis for effective C–O cleavage is not well understood, to our knowledge. Therefore, this work aimed to evaluate the effect of support in HDO of ethanol, cyclohexanol, and phenol as oxygenated model molecules for bio-oil on Ru catalysts. A series of 0.6 wt % Ru catalysts were prepared by wet impregnation with Ru(NO)(NO3)3 solutions. A strong influence of support in HDO activity of different molecules with the Ru catalyst was evidenced. Differences in activity on the catalyst with comparable particle size indicated that reactions involving the C–O cleavage by hydrogenation did not occur only on metallic sites. Rather, the activity took place by a cooperative action between the metallic phase and the support. For the HDO reaction of the studied molecules, Ru/TiO2 and Ru/ZrO2 were the most active solids as compared with Ru/SiO2 and Ru/Al2O3. Ethanol and cyclohexanol dehydration-reformation reactions showed that catalytic functionalities could be tuned with the reaction temperature. It was found that acid properties were more relevant when the temperature was increased (formation of ethylene and diethyl ether). At the same time, the metallic (dehydrogenation) function decreased (formation of acetaldehyde and its reformation to methane and CO). The usage of oxyphilic supports with oxygen vacancies, moderate acid site density, and redox properties in combination with high hydrogenating capacity metals like Ru may be the clue to developing highly active materials for alternative fuel production.

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“…The results revealed that the Pd/TiO 2 nanoparticles exhibited higher selectivity and turnover frequency than the Pd/TiO 2 nanowires. In addition, TiO 2 nanoparticles were also used as the support on the hydrodeoxygenation reaction of phenolic lignin model compounds, for example, guaiacol, cresol, , and phenol . However, their utilization in catalytic conversion of fatty acid and triglyceride has been rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Bifunctional MoS₂/TiO₂ Nanoparticles for Hydrodeoxygenation of Oleic Acid and Photodegradation of Carbonaceous Deposits

Krobkrong

Wangvisavawit

Chanlek

et al. 2022

ACS Appl. Nano Mater.

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In this work, MoS 2 /TiO 2 nanoparticles were investigated as a bifunctional catalyst for the conversion of oleic acid to diesel-range hydrocarbons and the removal of carbonaceous deposits on the catalyst surface. The entire series of catalysts with different mass loadings of MoS 2 (5−20 wt %) was synthesized via a solvothermal method. MoS 2 /TiO 2 nanoparticles had a high degree of MoS 2 dispersion on anatase TiO 2 support. The Brunauer− Emmett−Teller analysis reveals a marked increase in the specific surface area of 20 wt % MoS 2 /TiO 2 (171 m 2 g −1 ) compared to bare TiO 2 (121 m 2 g −1 ). For the catalytic conversion of oleic acid, it was found that the fraction of diesel-range hydrocarbons (C17−C18) in liquid products enhanced with increasing MoS 2 mass loading. Moreover, the MoS 2 /TiO 2 catalyst also presented high selectivity toward C18 hydrocarbons. This suggests that hydrodeoxygenation (HDO) was a dominant pathway for the catalytic conversion of oleic acid over MoS 2 /TiO 2 nanoparticles. For the photocatalytic degradation, to clean up the MoS 2 /TiO 2 catalyst after being used for the oleic acid conversion, hence, the photocatalytic removal of carbonaceous deposits on the surface was studied. The results demonstrate that carbonaceous deposits on spent MoS 2 /TiO 2 were removed under UV-light irradiation due to the photodegradation property of the TiO 2 support. Therefore, the active surface of the MoS 2 /TiO 2 catalyst was simply recovered by a facile approach at room temperature.

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Effect of TiO2 in supported NiWS catalysts for the hydrodeoxygenation of guaiacol

Cited by 18 publications

References 64 publications

Support–Activity Relationship in Heterogeneous Catalysis for Biomass Valorization and Fine-Chemicals Production

Support–Activity Relationship in Heterogeneous Catalysis for Biomass Valorization and Fine-Chemicals Production

Fundamental Study of Catalytic Functionalities Involved in Effective C–O Cleavage over Ru-Supported Catalysts

Bifunctional MoS₂/TiO₂ Nanoparticles for Hydrodeoxygenation of Oleic Acid and Photodegradation of Carbonaceous Deposits

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Effect of TiO2 in supported NiWS catalysts for the hydrodeoxygenation of guaiacol

Cited by 18 publications

References 64 publications

Support–Activity Relationship in Heterogeneous Catalysis for Biomass Valorization and Fine-Chemicals Production

Support–Activity Relationship in Heterogeneous Catalysis for Biomass Valorization and Fine-Chemicals Production

Fundamental Study of Catalytic Functionalities Involved in Effective C–O Cleavage over Ru-Supported Catalysts

Bifunctional MoS2/TiO2 Nanoparticles for Hydrodeoxygenation of Oleic Acid and Photodegradation of Carbonaceous Deposits

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Bifunctional MoS₂/TiO₂ Nanoparticles for Hydrodeoxygenation of Oleic Acid and Photodegradation of Carbonaceous Deposits