Preparation for Pt-Loaded Zeolite Catalysts Using w/o Microemulsion and Their Hydrocracking Behaviors on  Fischer-Tropsch Product

Hanaoka, Toshiaki; Miyazawa, Tomohisa; Shimura, Katsuya; Hirata, Satoshi

doi:10.3390/catal5010088

Cited by 7 publications

(10 citation statements)

References 37 publications

(44 reference statements)

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“…This catalyst has shown to be efficient enough, presenting a selectivity to the diesel fraction up to 80%, depending on the reaction conditions. In the work of Hanaoka et al [31], a novel catalyst was obtained by immobilizing Pt nanoparticles (prepared in ME) onto zeolite. The effect of Pt particle size on the hydrocracking of FT waxes was investigated.…”

Section: The Present Issuementioning

confidence: 99%

Synthesis of Nanostructured Catalytic Materials from Microemulsions

Sánchez-Domínguez

Boutonnet

2015

Catalysts

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BackgroundSince the 1980s [1,2], colloidal systems such as microemulsions (ME) have been widely investigated, especially for the synthesis of nanomaterials for various applications. In the field of catalysis, nanoparticles of noble metal or metal oxides, responsible for the catalytic activity and selectivity, are usually involved in the composition of the catalytic material [3]. A catalyst normally consists of metal nanoparticles deposited onto a carrier such as silica or alumina. Ideally, the nanoparticles will present a highly active surface area due to high metal dispersion. In addition, the surface structure of the nanoparticles, which depends on their size and shape, are related to the selectivity of the catalysts, for instance this is important in the case of alkane isomerization, which is a structure sensitive reaction [4].Depending of the size, the nanoparticles will contain various defects, which will correspond to catalytic sites with different selectivities and activities. These active sites correspond to groups of metal atoms placed on the edges, corners, and terraces structures at the surfaces of the metal nanoparticles. These metal atoms will have different coordination states and present different electronic effects, which will consequently result in different catalytic activity and selectivity. This is the reason why the preparation of nanoparticles with well-defined particle size is still of great interest in the field of catalysis. If one is able to obtain well-defined metal nanoparticles, it will be possible to relate the selectivity and activity of the reaction to some specific size and consequently to have a better understanding of the catalytic reaction mechanism. Consequently, by using a well-designed nanomaterial as catalyst, it will be possible to predict its properties regarding its catalytic activity and selectivity.During these last years, it has been shown that nanomaterials obtained from ME present specific properties, especially regarding the catalytic selectivity compared to catalysts prepared from traditional methods. Several catalytic processes have been investigated using these types of catalysts, i.e., high temperature catalytic combustion of methane, electro-catalyst for hydrogen production from methanol, production of polyalcohols from synthesis gas, Diesel production from synthesis gas via Fisher-Tropsch and hydrocracking of waxes, etc. [3][4][5][6][7][8][9][10][11]. These very different processes are associated to a great range of catalytic materials. The microemulsion method, based on water-in-oil, oil-in-water and bicontinuous ME, has shown to be suitable for the preparation of all these different types of materials [12][13][14][15][16][17][18][19][20][21][22].Even though a few valuable efforts were previously done to understand the formation of nanomaterials in ME systems [23][24][25], comprehensive research in this area is still needed to clarify this process, in order to reach a better control of nanoparticle characteristics and to understand why the formed nanopartic...

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Section: The Present Issuementioning

confidence: 99%

Synthesis of Nanostructured Catalytic Materials from Microemulsions

Sánchez-Domínguez

Boutonnet

2015

Catalysts

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“…Figure 5 shows the effect of the ratio of accessible Pt sites to the amount of medium acid site (denoted by CPt/CMA) on the hydrocracking reaction. The relationship between dpulse and CPt is as follows [23]:…”

Section: Effect Of Pt Content On the Hydrocracking Reaction Over Pt-lmentioning

confidence: 99%

“…The deposition method, carried out according to literature procedures, is described as follows [22,23]. The Pt complex particles were synthesized in the liquid phase and then immobilized onto support materials.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…CO/He (10/90% (v/v)) was intermittently injected into the holder at 50 °C until the amount of CO leaving the holder became constant. The calculation method has been reported in detail previously [23]. The CO pulse analysis was performed three times, and the average value from these replicates was taken as the dpulse value.…”

Section: Characterizationmentioning

confidence: 99%

“…%) in the hydrocracking of the FT product has not been fully discussed. The authors previously reported the preparation of Pt-loaded catalysts using water-in-oil (w/o) microemulsions and the effect of Pt particle size on hydrocracking reaction [22,23]. This preparation method is advantageous as the size of the supported Pt particles is well controlled, regardless of the Pt content.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Catalyst Preparation on Hydrocarbon Product Distribution in Hydrocracking of the Fischer-Tropsch Product with Low Pt-Loaded Catalysts

et al. 2015

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For the effective production of hydrocarbon liquid fuel in the hydrocracking of the Fischer-Tropsch (FT) product, the catalytic performance of Pt-loaded catalysts with low Pt content was investigated using an autoclave at 250 °C, an initial H2 pressure of 0.5 MPa, and a reaction time of 1 h. A screening study using Pt-loaded catalysts with a Pt content of 0.1 wt. % indicated that zeolite supports were more favorable for jet fuel (carbon numbers 9-15) production than amorphous oxide supports. The small particle size of the supported Pt particles and the high amount of medium acid sites for the supports led to higher performance of the Pt-loaded zeolite catalysts. In the hydrocracking reaction over Pt catalysts using the zeolite support with the high amount of medium acid sites, the yields of the corresponding jet fuel at 0.02 and 0.1 wt. % were almost the same. Pt-loaded catalysts OPEN ACCESSCatalysts 2015, 5 1984 with a Pt content of 0.02 wt. % were prepared using water-in-oil (w/o) microemulsions and their particle size was controlled between 1.0 and 2.6 nm. While the yield of the corresponding jet fuel was independent of Pt particle size, smaller Pt particles typically promoted the production of lighter hydrocarbons.

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Ce‐Modified MgFe−LDH Supported Au Particles: An Efficient Catalyst for Base‐Free Selective Oxidation of 5‐Hydroxymethylfurfural to 2,5‐Furandicarboxylic Acid

Moradi,

Kulinich,

Wunderlich

et al. 2024

ChemistrySelect

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Abstract5‐hydroxymethylfurfural (HMF) was selectively oxidized to 2,5‐furandicarboxylic acid (FDCA) using an effective catalytic system made of Au particles supported on Ce‐modified MgFe layered double hydroxide. The structural features and performance of the as‐prepared catalysts were examined using a range of characterizations, and the impact of altering reaction parameters was explored. It was demonstrated that the presence and quantity of Ce and Mg species in the catalyst formulation were the primary determinants of the activity of the Au@Mg−N−M−LDH catalysts (M=Ce, Cu, Mn, Zr, and N=Fe, Al). The catalyst Au@MgFeCe−LDH, loaded with 1 wt % Au, exhibited outstanding catalytic activity in the production of FDCA, achieving complete HMF conversion and 90 % FDCA selectivity. This was accomplished through a two‐step heating procedure, involving initial heating of the reaction medium at 40 °C for 2 hours followed by a subsequent heating at 100 °C for 6 hours, conducted under an oxygen pressure of 5 bar.

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Preparation for Pt-Loaded Zeolite Catalysts Using w/o Microemulsion and Their Hydrocracking Behaviors on Fischer-Tropsch Product

Cited by 7 publications

References 37 publications

Synthesis of Nanostructured Catalytic Materials from Microemulsions

Synthesis of Nanostructured Catalytic Materials from Microemulsions

Effects of Catalyst Preparation on Hydrocarbon Product Distribution in Hydrocracking of the Fischer-Tropsch Product with Low Pt-Loaded Catalysts

Ce‐Modified MgFe−LDH Supported Au Particles: An Efficient Catalyst for Base‐Free Selective Oxidation of 5‐Hydroxymethylfurfural to 2,5‐Furandicarboxylic Acid

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