The mechanism of isomerization of hexanes on platinum catalysts

Barron, Y

doi:10.1016/0021-9517(63)90023-x

Cited by 52 publications

(2 citation statements)

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“…At certain temperature, the heat overcome the activation energy; therefore, the bond between the adsorbate and adsorbent will break and the adsorbed species desorb. If different active metals are present, they usually desorb the adsorbed species at different temperature [18]. These desorbed molecules enter the stream of inert carrier gas and are swept to the detector, which measure the gas concentrations.…”

Section: Tpd (Temperature Programmed Desorption) Analysismentioning

confidence: 99%

Synthesis and Determination of Active Acidic/Basic Sites on Zn Loaded Zeolite (ZSM-5) Catalyst & Its Role in Catalytic Reforming of Naphtha Using HPMR Reactor

Khan,

Siddiqui,

Qayyum

2023

SJAC

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The crystalline aluminosilicate ZSM-5 (Zeolite Socony Mobil) has a high Si to Al ratio. It is utilized as a catalytic support material. Zeolite has huge industrial applications. They are commonly employed as heterogeneous catalyst for hydrocarbon isomerization reactions in the petroleum sector. In general, zeolite is synthesized as a powder with low mechanical strength. Powdered ZSM-5 and binder (alumina) were combined, and glacial acetic acid (peptide agent) was added. Mix them thoroughly before loading them into the extruder to form the shape. After drying for one day to let the acetic acid drain, they were heated for eight hours and calcined to remove the liquid from the pores, which aids in the formation of pores/active sites. By mixing the ZnNO 3 solution with the sample, the wet impregnation process is utilized to load Zn metal on extruded ZSM-5. Zn is chosen for loading because it favours cyclization and forming aromatic compounds. After many hours of such wet contact, the suspension evaporates, and the chemical is deposited randomly inside and outside the zeolite pores. Further heating and calcination are carried out. TPD (temperature-programmed desorption) of H/ZSM-5 is performed under catalyst characteristics. TPD of H/ZSM-5 reveals that it comprises primarily highly acidic sites with temperatures above 500°C. The prepared catalyst is employed in the naphtha reforming process in the HPMR (High-Pressure Micro Reactor) to produce BTX as the product.

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Section: Tpd (Temperature Programmed Desorption) Analysismentioning

confidence: 99%

Synthesis and Determination of Active Acidic/Basic Sites on Zn Loaded Zeolite (ZSM-5) Catalyst & Its Role in Catalytic Reforming of Naphtha Using HPMR Reactor

Khan,

Siddiqui,

Qayyum

2023

SJAC

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“…Oxide surface supported catalytic sub-nanometer platinum clusters have found wide application in industrial reactions involving (de-)hydrogenation of hydrocarbons, such as naphtha reforming and alkane non-oxidative dehydrogenation [1][2][3][4][5][6][7] Industrial catalysts correspond to low loading of Pt supported on alumina, with a corresponding particle size of 0.6 to 1.1 nm. [8] However, the detailed catalytic mechanism of these reactions has not been fully elucidated despite the efforts expended over the years, which is partly due to the difficulty in characterizing the shape, size and active sites of the cluster in this "nonscalable" regime.…”

Section: Introductionmentioning

confidence: 99%

Global Optimization of Adsorbate Covered Supported Cluster Catalysts: The Case of Pt₇H₁₀CH₃ on α‐Al₂O₃

2019

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Determining structures of supported sub-nanometer catalytic clusters is important for finding binding sites, active sites, and reaction mechanisms. In realistic conditions, the cluster may be covered with adsorbed reactants and intermediates, which strongly affect the structure of the cluster compared to the low coverage regime. The global optimization of supported adsorbate-covered clusters is not possible with existing methods. We present a customized Basin Hopping (BH) approach, with a core (metal cluster)-shell (adsorbates) separation scheme, and per-form first applications to the search of low-energy isomers of Pt 7 /α-Al 2 O 3 at high hydrogen coverage (10H). The presence of adsorbates significantly alters the low-energy isomers compared to bare Pt 7 /α-Al 2 O 3 . Molecular dynamics simulations additionally show the different time-scales associated with the mobility of H and Pt atoms. The revised BH method with coreshell separation presents key advantages for the structural exploration of adsorbate-covered supported catalysts, relevant to realistic catalytic conditions.

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Hydrocarbon Catalytic Reactivity of Supported Nanometallic Particles

Garin

Légaré

2007

Nanoparticles and Catalysis

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The mechanism of isomerization of hexanes on platinum catalysts

Cited by 52 publications

References 0 publications

Synthesis and Determination of Active Acidic/Basic Sites on Zn Loaded Zeolite (ZSM-5) Catalyst & Its Role in Catalytic Reforming of Naphtha Using HPMR Reactor

Synthesis and Determination of Active Acidic/Basic Sites on Zn Loaded Zeolite (ZSM-5) Catalyst & Its Role in Catalytic Reforming of Naphtha Using HPMR Reactor

Global Optimization of Adsorbate Covered Supported Cluster Catalysts: The Case of Pt₇H₁₀CH₃ on α‐Al₂O₃

Hydrocarbon Catalytic Reactivity of Supported Nanometallic Particles

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The mechanism of isomerization of hexanes on platinum catalysts

Cited by 52 publications

References 0 publications

Synthesis and Determination of Active Acidic/Basic Sites on Zn Loaded Zeolite (ZSM-5) Catalyst & Its Role in Catalytic Reforming of Naphtha Using HPMR Reactor

Synthesis and Determination of Active Acidic/Basic Sites on Zn Loaded Zeolite (ZSM-5) Catalyst & Its Role in Catalytic Reforming of Naphtha Using HPMR Reactor

Global Optimization of Adsorbate Covered Supported Cluster Catalysts: The Case of Pt7H10CH3 on α‐Al2O3

Hydrocarbon Catalytic Reactivity of Supported Nanometallic Particles

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Global Optimization of Adsorbate Covered Supported Cluster Catalysts: The Case of Pt₇H₁₀CH₃ on α‐Al₂O₃