Selective hydrodeoxygenation of bio-oil derived products: acetic acid to propylene over hybrid CeO<sub>2</sub>–Cu/zeolite catalysts

Witsuthammakul, Ayut; Sooknoi, Tawan

doi:10.1039/c5cy01485a

Cited by 23 publications

(14 citation statements)

References 33 publications

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“…Physical mixing of CeO 2 with Cu/HY led to a hybrid catalyst that enabled the conversion of biomassderived acetic acid to propylene via keto-hydrodeoxygenation pathway in continuous flow conditions. 148 About 85% acetic acid conversion with 49% selectivity to propylene was obtained over the CeO 2 -Cu/HY (25 wt% of Cu/HY) catalyst due to the presence of highly dispersed Cu species.…”

Section: Zeolite-supported Catalystsmentioning

confidence: 99%

Advances in porous and nanoscale catalysts for viable biomass conversion

et al. 2019

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Section: Zeolite-supported Catalystsmentioning

confidence: 99%

Advances in porous and nanoscale catalysts for viable biomass conversion

et al. 2019

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“…Five different metals (Ni, Co, Mn, Zn, Ce) supported on ZSM-5 were initially screened for their activity for 5-nonanone HDO. While these metals have been reported for various hydrogenation and hydrodeoxygenation mechanisms previously, ,− only Ni-7/ZSM-5 and Co-11/ZSM-5 were observed to be active for 5-nonanone hydrodeoxygenation. All Mn, Zn, and Ce loaded ZSM-5 catalysts showed no conversion under typical reaction conditions (Figure S2).…”

Section: Resultsmentioning

confidence: 72%

Hydrodeoxygenation (HDO) of Biomass Derived Ketones Using Supported Transition Metals in a Continuous Reactor

Yang

Jenkins

Leal

et al. 2019

ACS Sustainable Chem. Eng.

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The hydrodeoxygenation (HDO) of 5-nonanonea model compound for more complex biomass-derived moleculesto n-nonane was investigated using a variety of heterogeneous multifunctional metal-impregnated aluminosilicate catalysts in a packed-bed continuous flow reactor system. Under optimized reaction conditions (200 °C, 1.38 MPa H 2 ), >99% conversion and >99% selectivity to n-nonane was achieved within a 30 min residence time over both Ni (7 wt %) and Co (9 wt %) supported on Perlkat 79-3, a high-surface area amorphous aluminosilicate. This work provides a further understanding of the effects of different metals, supports, and metal loading amounts on HDO of 5nonanone and demonstrates an efficient translation of HDO reactions of ketones from batch reactors to continuous flow systems.

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“…When the conversion approaches 100%, the coverage of 3-pentanone on the active sites is high and the secondary reactions start to dominate, which lowers the selectivity of ketone. Despite the moderate decrease of selectivity at high conversion, the 3-pentanone selectivity on Zr-Beta remains much higher than that on the parent H-Beta or HZSM-5 at a similar conversion, indicating LAS of Zr-Beta is much more selective for the ketonization reaction than BAS of H-Beta or HZSM-5. , Furthermore, this selectivity is also much higher than that on zeolites modified by other metal oxides, ,− highlighting the uniqueness of the Lewis acidic zeolite for selective ketonization.…”

Section: Resultsmentioning

confidence: 97%

Ketonization of Propionic Acid on Lewis Acidic Zr-Beta Zeolite with Improved Stability and Selectivity

Guo

et al. 2021

ACS Sustainable Chem. Eng.

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Ketonization reactions provide a feasible approach to remove oxygen and increase carbon chain length for conversion of biomass derived carboxylic acids. However, the reaction suffers from fast catalyst deactivation and low ketone selectivity. In this work, Lewis acidic heteroatom Ti-, Zr-, Ce-, and Sn-Beta zeolites were prepared using a twostep post-synthesis method and applied in vapor phase ketonization of propionic acid at 350 °C. Among these zeolites, Zr-Beta shows both the highest activity and selectivity. Characterizations indicate that Zr prefers the vacant tetrahedral site when the Zr content is < 7%, corresponding to the maximal fraction of vacant sites produced from dealumination of the parent H-Beta with a Si/Al ratio of 19. Extraframework Zr may also form at a Zr content ≥ 7%. The tetrahedrally coordinated framework Zr species (mainly in the structure of open sites) show Lewis acidic characteristic, and their density can be linearly correlated with the ketonization activity, indicating that these sites are active sites for ketonization. In contrast to rapid deactivation of H-Beta, the 7% Zr-Beta is stable for ketonization over 60 h, maintaining a conversion of ∼50% and a 3-pentanone selectivity > 96% at a space time of 2 h. The amount of coke deposition on Zr-Beta is about 1/3 of that on H-Beta, and the structure of Zr-Beta is preserved after 60 h of reaction. The results of this work indicate that Zr-Beta zeolite is a promising catalyst for ketonization with good stability and high selectivity toward ketone.

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Selective hydrodeoxygenation of bio-oil derived products: acetic acid to propylene over hybrid CeO₂–Cu/zeolite catalysts

Abstract: Propylene and light distillates can be directly obtained by keto-hydrodeoxygenation of acetic acid over a single bed of CeO2–Cu/zeolite catalyst.

Cited by 23 publications

References 33 publications

Advances in porous and nanoscale catalysts for viable biomass conversion

Advances in porous and nanoscale catalysts for viable biomass conversion

Hydrodeoxygenation (HDO) of Biomass Derived Ketones Using Supported Transition Metals in a Continuous Reactor

Ketonization of Propionic Acid on Lewis Acidic Zr-Beta Zeolite with Improved Stability and Selectivity

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Selective hydrodeoxygenation of bio-oil derived products: acetic acid to propylene over hybrid CeO2–Cu/zeolite catalysts

Abstract: Propylene and light distillates can be directly obtained by keto-hydrodeoxygenation of acetic acid over a single bed of CeO2–Cu/zeolite catalyst.

Cited by 23 publications

References 33 publications

Advances in porous and nanoscale catalysts for viable biomass conversion

Advances in porous and nanoscale catalysts for viable biomass conversion

Hydrodeoxygenation (HDO) of Biomass Derived Ketones Using Supported Transition Metals in a Continuous Reactor

Ketonization of Propionic Acid on Lewis Acidic Zr-Beta Zeolite with Improved Stability and Selectivity

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Selective hydrodeoxygenation of bio-oil derived products: acetic acid to propylene over hybrid CeO₂–Cu/zeolite catalysts