C O cleavage of diphenyl ether followed by C C coupling reactions over hydrophobized Pd/HY catalysts

Scaldaferri, Cristiane Almeida; Warakunwit, Puridej; Pasa, Vânya Márcia Duarte; Resasco, Daniel E.

doi:10.1016/j.apcatb.2019.118081

Cited by 25 publications

(7 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hydrophilic supports are prone to deactivation through strong adsorption of reactively formed water as a byproduct of hydrogenolysis and deoxygenation at acidic sites. , Tuning the support hydrophobicity offers an important strategy for increasing catalyst performance during hydrogenolysis and can be achieved by postmodification or the incorporation of organic functions during support synthesis . For example, Pd/HY postmodified by octadecyltrichorosilane (OTS) imparts a 30% increase in conversion during DPE hydrogenolysis compared to the parent Pd/HY . Postmodification by a polyvinylpyrrolidone (PVP) coating enhanced the hydrophobicity and concomitant HDO performance of CoS 2 –MoS 2 catalysts for 4-ethylphenol conversion to ethylbenzene, relative to unmodified CoS 2 –MoS 2 .…”

Section: Catalytic Hydrogenolysismentioning

confidence: 99%

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

“…67 For example, Pd/ HY postmodified by octadecyltrichorosilane (OTS) imparts a 30% increase in conversion during DPE hydrogenolysis compared to the parent Pd/HY. 68 Postmodification by a polyvinylpyrrolidone (PVP) coating enhanced the hydrophobicity and concomitant HDO performance of CoS 2 − MoS 2 catalysts for 4-ethylphenol conversion to ethylbenzene, relative to unmodified CoS 2 −MoS 2 . 69 Hybrid inorganic− organic silicas are also versatile supports with tunable hydrophobicity, offering significant rate-enhancements for guaiacol HDO/hydrogenolysis over Ni 2 P/SiO 2 -based catalysts.…”

Section: ■ Catalytic Hydrogenolysismentioning

confidence: 99%

“…The importance of the water byproduct formed during lignin hydrogenolysis and hydrodeoxygenation should not be neglected since this is detrimental to the activity of many catalysts. Hydrophobic catalysts offer one solution to this issue, significantly improving stability 68,70 with the added benefit of tuning product selectivity. 170 Future research in this area must also focus on investigating catalyst stability under forcing conditions, notably their tolerance to water and inorganic impurities that may be present in lignin oil or, in the case of RCF, released during whole biomass fractionation.…”

Section: ■ Conclusion and Future Perspectivesmentioning

confidence: 99%

See 3 more Smart Citations

Hydrogenolysis of Lignin-Derived Aromatic Ethers over Heterogeneous Catalysts

Shivhare

Jampaiah

Bhargava

et al. 2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Global temperature has risen >1 °C since the preindustrial era, resulting in well-documented adverse climate impacts including extreme weather (floods, droughts, storms, and heat waves), a rise in sea level accompanying melting polar and glacial ice, and disrupted crop growth. These changes are closely correlated with anthropogenic greenhouse gas emissions, predominantly arising from the combustion of nonrenewable fossil fuels. Lignin derived from lignocellulose is the second most abundant biopolymer on Earth, and a rich source of renewable aromatic hydrocarbons to replace those currently obtained from fossil resources. Lignin depolymerization by cleavage of C–O and C–C linkages in the biopolymer can be achieved by direct pyrolysis or catalytic transformations, involving oxidation, hydrolysis, or hydrogenolysis reactions. Hydrogenolysis, in which H2 gas (or in-situ generated reactive H species) is supplied to lignin under relatively mild conditions, has attracted significant attention. This Perspective summarizes recent progress in the development of heterogeneous catalysts for the cleavage of C–O linkages in lignin-derived aromatic ethers by hydrogenolysis: it encompasses strategies using H2, hydrogen transfer, and photocatalysis for aromatic monomers production, and the determination of structure–activity relationships and underlying reaction mechanisms.

show abstract

Section: Catalytic Hydrogenolysismentioning

confidence: 99%

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Section: ■ Catalytic Hydrogenolysismentioning

confidence: 99%

Section: ■ Conclusion and Future Perspectivesmentioning

confidence: 99%

See 2 more Smart Citations

Hydrogenolysis of Lignin-Derived Aromatic Ethers over Heterogeneous Catalysts

Shivhare

Jampaiah

Bhargava

et al. 2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…[ 20,21 ] Such functionalizations have been used to increase zeolite hydrophobicity to stabilize the zeolite in water/oil emulsions and to catalyze key biofuel upgrading reactions. [ 22–24 ] However, these functionalizations do not occur in the interior micropore walls and are in fact limited to the external crystal surface [ 25 ] because the molecular diameters of organosilanes are much larger than those of zeolite pores, which hinders diffusion through intracrystalline micropores. [ 19 ] Therefore, organic post‐functionalization has persistently proved ineffective for microporous zeolites, and to the best of our knowledge, no general strategy has been developed yet for the post‐synthesis modification of zeolite micropores.…”

Section: Introductionmentioning

confidence: 99%

Post‐Synthesis Functionalization Enables Fine‐Tuning the Molecular‐Sieving Properties of Zeolites for Light Olefin/Paraffin Separations

et al. 2021

View full text Add to dashboard Cite

Zeolite molecular sieves are widely used in gas separation and shape‐selective catalysis, but these applications often require discriminating differences as little as 0.1 Å. Molecular sieving with such size selectivity demands zeolites with highly tunable pore diameters and adsorption properties, which are technically challenging to prepare. Nevertheless, it is shown that a wide range of organic functional groups can be covalently functionalized onto the interior pore walls of the zeolites, MOR, LTL, FAU, and MFI, to systematically “tune” their effective pore diameters with respect to the size of organic groups. For organic functionalization, small and aggressive organic electrophiles are used (e.g., organo‐halide and ‐diazonium) as grafting agents, which are accessible to the intracrystalline void space, forming a C–Ozeolite bond in a reaction with a bridging oxygen as proved by multiple analysis data. It is demonstrated that the post‐functionalization can be used to tailor the molecular sieving action of a parent zeolite to give size‐selective adsorbents for light olefin/paraffin separations. 4‐Methoxybenzene‐functionalized MOR separates ethylene from ethane with an ideal‐adsorbed‐solution‐theory selectivity of ≈5873, whereas toluene‐grafted MOR completely separates propylene/propane mixtures. Therefore, tailoring the molecular‐sieving properties of zeolites by organic functionalization broadens their applications to challenging separations.

show abstract

High‐Performance Heterogeneous Thermocatalysis Caused by Catalyst Wettability Regulation

et al. 2022

Chemistry A European J

View full text Add to dashboard Cite

Catalyst wettability regulation has emerged as an attractive approach for high catalytic performance for the past few years. By introducing appropriate wettability, the molecule diffusion of reactants and products can be enhanced, leading to high activity. Besides this, undesired molecules are isolated for high selectivity of target products and long‐term stability of catalyst. Herein, we summarize wettability‐induced high‐performance heterogeneous thermocatalysis in recent years, including hydrophilicity, hydrophobicity, hybrid hydrophilicity‐hydrophobicity, amphiphilicity, and superaerophilicity. Relevant reactions are further classified and described according to the reason for the performance improvement. It should be pointed out that studies of utilizing superaerophilicity to improve heterogeneous thermocatalytic performance have been included for the first time, so this is a comparatively comprehensive review in this field as yet.

show abstract

C O cleavage of diphenyl ether followed by C C coupling reactions over hydrophobized Pd/HY catalysts

Cited by 25 publications

References 40 publications

Hydrogenolysis of Lignin-Derived Aromatic Ethers over Heterogeneous Catalysts

Hydrogenolysis of Lignin-Derived Aromatic Ethers over Heterogeneous Catalysts

Post‐Synthesis Functionalization Enables Fine‐Tuning the Molecular‐Sieving Properties of Zeolites for Light Olefin/Paraffin Separations

High‐Performance Heterogeneous Thermocatalysis Caused by Catalyst Wettability Regulation

Contact Info

Product

Resources

About