Experimental and kinetic study of n-heptane isomerization on nanoporous Pt-(Re, Sn)/HZSM5-HMS catalysts

Parsafard, Nastaran; Peyrovi, M. H.; Rashidzadeh, Mehdi

doi:10.1016/s1872-2067(15)61114-7

Cited by 18 publications

(17 citation statements)

References 38 publications

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“…. The peaks at 2.3°, 6°–11°, 22°–25°, and a broad diffraction line between 20° and 30° observed in the five profiles can be indexed as HMS, ZSM‐5 phases, the amorphous part of the substrate, respectively . By comparing the intensity of peaks, no apparent difference was observed, which indicates that HZSM5‐HMS support has not been destroyed after the loading of Ni and W species.…”

Section: Resultsmentioning

confidence: 89%

Ni‐W Catalysts Supported on HZSM‐5/HMS for the Hydrogenation Reaction of Aromatic Compounds: Effect of Ni/W Ratio on Activity, Stability, and Kinetics

Peyrovi

Parsafard

Hajiabadi

2017

Int J of Chemical Kinetics

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Ni‐W/HZSM5‐HMS catalysts were evaluated for the benzene hydrogenation reaction at 130–190°C. To study the catalyst characterization, X‐ray diffraction, X‐ray fluorescence, Fourier transform infrared, UV–vis, diffuse reflectance spectra, temperature‐programmed desorption of NH3, FT‐IR of adsorbed pyridine measurements (Py‐IR), H2 chemisorption, nitrogen adsorption–desorption, and TGA techniques were used. Kinetics of benzene hydrogenation was investigated under various hydrogen and benzene pressures, and the effect of reaction conditions on catalytic performance was studied. The results showed that bimetallic catalysts have better ability than a monometallic catalyst (Ni/HZSM5‐HMS) for this reaction, such as maximum benzene conversion (100%), minimum toluene conversion (1.76–40%), very low converted xylene, benzene selectivity (100%), good catalytic stability against coke deposition, and appropriate kinetic parameters.

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Section: Resultsmentioning

confidence: 89%

Ni‐W Catalysts Supported on HZSM‐5/HMS for the Hydrogenation Reaction of Aromatic Compounds: Effect of Ni/W Ratio on Activity, Stability, and Kinetics

Peyrovi

Parsafard

Hajiabadi

2017

Int J of Chemical Kinetics

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“…The selection of these parameters with their specific experimental ranges was meticulously based on the preliminary screening test. Many attempts have been made to select parameters which are frequently used in the literature and also have effective impact on the kinetic rate 12,13,15 . The selection of these variables were purposefully chosen after the preliminary screening test, and these variables are regularly used in the literature.…”

Section: Methodsmentioning

confidence: 99%

“…Generally, bifunctional solid catalysts include metallic sites in the dehydrogenating process and acidic sites for isomerization/cyclization functionalities. The addition of another metal part such as Zr, 8 Fe, 9 Cr, 10,11 Al, 12 Sn, 13 Re, 13 and Ir 14 to modify the properties of a metallic section, which mainly utilized noble metals (specifically Pt), has been studied for isomerization reactions in recent years. These metals can closely interact with Pt which can affectthe selectivity, activity, and stability of catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…Several elements such as Co, 18 Ti, 19,20 Al, 21 V, 22 Fe, 23 and Mn 24 were added to the mesoporous frameworks to elevate their acid and/or redox properties. In our previous researches, several modifications to the catalytic activities of Pt catalysts supported hexagonal mesoporous silica (HMS) and also its composite with other materials is accomplished for the n ‐heptane isomerization 1,11–13,15 . The synthesis of a series of Pt/ZSM‐5/HMS, Pt/Zr‐HMS, Pt/Al‐HMS/HZSM‐5, Pt/Zr(x)‐HMS/HZSM‐5, and Pt‐(Sn, Re)/HZSM5‐HMS reveals that HMS can be considered as a proper candidate for isomerization processes.…”

Section: Introductionmentioning

confidence: 99%

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Gas‐phase catalytic isomerization of n‐heptane using Pt/(CrO_x/ZrO₂)‐HMS catalysts: A kinetic modeling

Parsafard

Garmroodi

Mirzaei

2021

Int J of Chemical Kinetics

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A systematic study has been conducted to optimize the process conditions and to evaluate the kinetic parameters for the isomerization reaction of n‐heptane on the novel platinum‐chromium/zirconium‐ hexagonal mesoporous silica (Pt/(CrOx/ZrO2)‐HMS) catalysts (PCZH). The kinetic experiments were performed in a fixed‐bed reactor at the reaction temperatures of 200–350°C, Cr/Zr molar ratio of 5–35, the n‐C7 flow rate of 2–4.5 cc h−1, and H2 flow rate of 20–45 cc min−1. The statistical analysis of all experimental data was carried out using analysis of variance to optimize the operating conditions for n‐heptane reactions. The results show that the incorporation of Cr into the Pt‐Zr‐HMS structure promotes the kinetic rate of the isomerization reaction. Sharp elevation from 0.08 to 0.3 mol g−1 s−1 in the isomerization kinetic rates can be observed in the PCZH(35) and a temperature of 350 °C, when the H2 flow rate increases from 20 to 45 cc min−1 at a constant flow rate of n‐C7 (4.5 cc h−1). The surface and contour plot verifies that the kinetic rate does not significantly vary with respect to studied temperatures and Cr/Zr ratio when the flow rate of isomerization feeds is considerably low. The experimental kinetic rate obtained on the optimum condition is in good agreement with the prediction of the response surface method. The kinetic model of Langmuir–Hinshelwood as well as a power‐law model was developed for this reaction. A reasonably good fit of the obtained data shows that the Langmuir–Hinshelwood model has a better performance to define the isomerization of the n‐heptane process.

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“…Due to the suitable pore structure and moderate acidity, SAPO-11 is considered as a potential materials for the hydroisomerization of n -alkanes [10] . Noble metals, such as platinum and palladium, are usually applied as the metal site [11][12][13][14][15] . The noble metals exhibit excellent catalytic performance in the n -alkanes hydroisomerization, but the high cost limits their industrial application.…”

Section: Introductionmentioning

confidence: 99%

Effect of preparation method on the bimetallic NiCu/SAPO-11 catalysts for the hydroisomerization of n-octane

Yang

Liu

et al. 2019

Journal of Energy Chemistry

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Experimental and kinetic study of n-heptane isomerization on nanoporous Pt-(Re, Sn)/HZSM5-HMS catalysts

Cited by 18 publications

References 38 publications

Ni‐W Catalysts Supported on HZSM‐5/HMS for the Hydrogenation Reaction of Aromatic Compounds: Effect of Ni/W Ratio on Activity, Stability, and Kinetics

Ni‐W Catalysts Supported on HZSM‐5/HMS for the Hydrogenation Reaction of Aromatic Compounds: Effect of Ni/W Ratio on Activity, Stability, and Kinetics

Gas‐phase catalytic isomerization of n‐heptane using Pt/(CrO_x/ZrO₂)‐HMS catalysts: A kinetic modeling

Effect of preparation method on the bimetallic NiCu/SAPO-11 catalysts for the hydroisomerization of n-octane

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Experimental and kinetic study of n-heptane isomerization on nanoporous Pt-(Re, Sn)/HZSM5-HMS catalysts

Cited by 18 publications

References 38 publications

Ni‐W Catalysts Supported on HZSM‐5/HMS for the Hydrogenation Reaction of Aromatic Compounds: Effect of Ni/W Ratio on Activity, Stability, and Kinetics

Ni‐W Catalysts Supported on HZSM‐5/HMS for the Hydrogenation Reaction of Aromatic Compounds: Effect of Ni/W Ratio on Activity, Stability, and Kinetics

Gas‐phase catalytic isomerization of n‐heptane using Pt/(CrOx/ZrO2)‐HMS catalysts: A kinetic modeling

Effect of preparation method on the bimetallic NiCu/SAPO-11 catalysts for the hydroisomerization of n-octane

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Gas‐phase catalytic isomerization of n‐heptane using Pt/(CrO_x/ZrO₂)‐HMS catalysts: A kinetic modeling