Catalyst of Palladium Supported on H-Beta Zeolite with Nanosized Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; for Isomerization of &lt;i&gt;n&lt;/i&gt;-Hexane

Kimura, Toshiyuki; Gao, Jeng; Sakashita, Koji; Li, Xiaohong; Asaoka, Sachio

doi:10.1627/jpi.55.40

Cited by 10 publications

(5 citation statements)

References 20 publications

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“…In the second step, the resulting delignification liquor was subjected to a catalytic treatment with a flowrate of 0.5 mL min À 1 in a packed bed with 2 g of ß-zeolite prepared in the same way as in the 1-step process approach. Palladium was deposited on the different types of ßzeolite through ion exchange following the experimental procedures reported elsewhere, [59,60] leading to a supported catalyst with a palladium loading of 1 wt.%. ICP-AES was used to determine the Pd loading in the synthesized catalyst.…”

Section: Methodsmentioning

confidence: 99%

2‐step lignin‐first catalytic fractionation with bifunctional Pd/ß‐zeolite catalyst in a flow‐through reactor

Kramarenko,

Uslu,

Etit

et al. 2024

ChemSusChem

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This work demonstrates an additive and hydrogen‐free 2‐step lignin‐first fractionation in flow‐through. First, solvolytic delignification renders lignin liquors with its native chemical structure largely intact; and second, β‐zeolite catalytic depolymerization of these liquors leads to similar monomer yields as the corresponding 1‐step fractionation process. Higher delignification temperatures lead to slightly lower β‐O‐4 content in the solvated lignin, but does not affect significantly the monomer yield, so a higher temperature was overall preferred as it promotes faster delignification. Deposition of Pd on β‐zeolite resulted in a bifunctional hydrogenation/dehydration catalyst, tested during the catalytic depolymerization of solvated lignin with and without hydrogen addition. Pd/ β‐zeolite displays synergistic effects (compared to the Pd/γ‐Al2O3 and β‐zeolite tested individually and as a mixed bed), resulting in higher monomer yield. This is likely caused by increased acidity and the proximity between the metallic and acid active sites. Furthermore, different β‐zeolite with varying SAR and textural properties were studied to shed light onto the effect of acidity and porosity in the stabilization of lignin monomers. While some of the catalysts showed stable performance, characterization of the spent catalyst reveals Al leaching (causing acidity loss and changes in textural properties), and some degree of coking and Pd sintering.

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Section: Methodsmentioning

confidence: 99%

2‐step lignin‐first catalytic fractionation with bifunctional Pd/ß‐zeolite catalyst in a flow‐through reactor

Kramarenko,

Uslu,

Etit

et al. 2024

ChemSusChem

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“…A catalyst for isomerization from n-hexane to isoparaffin was developed 23) . The catalyst consists of Pd on a composite of 35 wt% nano-sized (defined as 5-50 nm, and here called ns) Al2O3 and 65 wt% BEA zeolite (SiO2/ Al2O3 25).…”

Section: )～22)mentioning

confidence: 99%

Catalyst of Palladium Supported on H-Beta Zeolite with Nanosized Al2O3 for Isomerization of n-Heptane

Kimura

Suezaki

Sakashita

et al. 2012

J. Jpn. Petrol. Inst.

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To investigate the synthesis of isoparaffin from heavy naphtha, n-heptane conversion was studied. Applying and improving the isomerization catalyst developed for n-hexane was examined for n-heptane. The developed catalyst, Pd/nano-sized (defined as 5-50 nm, and here called as ns) Al2O3/H-BEA zeolite, was effective for the isomerization of both n-hexane and n-heptane, but n-heptane was more easily decomposed in comparison with n-hexane. In the case of n-heptane, cracking product selectivity was extremely high at about 85 % at 300 . However, improved high activity and selectivity were obtained by removal of residual chlorine from the catalyst, which decreased the number of acid sites acting as cracking sites formed by residual chlorine on ns Al2O3. If the content of ns Al2O3 combined to H-BEA zeolite changed in the catalyst, cracking selectivity remained constant at a lower level comparing with the non-combined zeolite. ns Al2O3 also reduced the acidity of strong acid sites on the zeolite particle surface. X-ray photoelectron spectroscopy showed that reduced Pd/ns Al2O3/H-BEA catalyst with removed residual chlorines had the highest Pd dispersion because the chloride anions act effectively for cationic Pd dispersion on ns Al2O3 which can adsorb chloride anions. Since ns Al2O3 was also highly dispersed onto the zeolite particle surface, acid sites were formed at the boundary. The catalyst has highly dispersed Pd metal because of the stable Pd was highly dispersed on the acid sites by removing chlorine.

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“…The catalysts were prepared typically to follow the procedures shown in the previous paper [2][3][4][5][6][7][8][9][10][11][12]. For example, ns Al 2 O 3 -BEA (beta type) zeolite catalyst and [Metal/c-Al 2 O 3 ]-ns Al 2 O 3 -BEA zeolite catalyst were synthesized by wet mixing followed by calcination.…”

Section: Catalyst Preparation and Characterizationmentioning

confidence: 99%

“…This research has provided new advances in catalysis, including hydrodesulfurization (HDS) [2,3], HC [4][5][6][7] catalytic cracking [8][9][10] and reforming [11,12]. This report is concerned to the new investigation concept for catalytic roles of ns oxides composed with zeolite in this field.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Roles of Nano-Sized Oxides Composed with Zeolite for Hydrocracking, Catalytic Cracking and Reforming

Kimura

Sakashita

et al. 2011

Catal Surv Asia

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Catalyst of Palladium Supported on H-Beta Zeolite with Nanosized Al<sub>2</sub>O<sub>3</sub> for Isomerization of <i>n</i>-Hexane

Cited by 10 publications

References 20 publications

2‐step lignin‐first catalytic fractionation with bifunctional Pd/ß‐zeolite catalyst in a flow‐through reactor

2‐step lignin‐first catalytic fractionation with bifunctional Pd/ß‐zeolite catalyst in a flow‐through reactor

Catalyst of Palladium Supported on H-Beta Zeolite with Nanosized Al<sub>2</sub>O<sub>3</sub> for Isomerization of <i>n</i>-Heptane

Catalytic Roles of Nano-Sized Oxides Composed with Zeolite for Hydrocracking, Catalytic Cracking and Reforming

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