n-Heptane isomerization over Pt/WO3-ZrO2: A kinetic study

Khurshid, Muneeb; Al-Khattaf, S.

doi:10.1016/j.apcata.2009.08.005

Cited by 32 publications

(13 citation statements)

References 33 publications

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“…16,[27][28][29] Since both metallicity and acidity play pivotal roles in catalytic hydroisomerization, their changes originated from their proximity must be taken into account, instead of completely independent factors. Since the reaction mechanism on Pt/WZrO x catalysts has been carefully investigated [30][31][32] , the acid sites and metal sites can be comprehensively characterized [33][34][35][36][37] , and the acid-metal intimacy are controllable 16,17,27,38 , WZrO x was chosen as the acidic support and Pt was the engine to investigate the influence of adjacency on the properties of acid and metal, and on the hydroisomerization performance.…”

Section: Introductionmentioning

confidence: 99%

Adjacent Pt Nanoparticles and Sub-nanometer WO _x Clusters Determine Catalytic Isomerization of C ₇ H ₁₆

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Adjacent Pt Nanoparticles and Sub-nanometer WO _x Clusters Determine Catalytic Isomerization of C ₇ H ₁₆

et al. 2022

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“…Metallic sites catalyze dehydrogenation and hydrogenation reactions while acidic sites catalyze isomerization and hydrocracking reactions. The ideal catalyst should have the right balance between acidic and metallic sites and needs to be developed to prevent n-heptane from cracking while promoting the conversion of nheptane to multi-branched isomers [8].…”

Section: Introductionmentioning

confidence: 99%

n-Heptane Isomerization Activities of Pt Catalyst Supported On Micro/Mesoporous Composites

Ghaderi

Peyrovi

Parsafard

2021

Preprint

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Pt loaded on a series of MCM-48 and composites with HZSM-5, HY or TiO2 has been prepared and studied for n-heptane isomerization reaction at 200–350°C. The structural characterization, acid distribution and morphology of these catalysts were characterized by XRD, FT-IR, UV-Vis DRS, SEM, NH3-TPD, and nitrogen adsorption-desorption methods. These new catalysts have good ability for n-heptane isomerization. The ideal catalytic performance was observed on Pt/MCM48-HZSM5 catalyst.

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“…The main concern for the commercialization of n-heptane isomerization is that β-cleavage occurs during the isomerization reaction. A suitable catalyst needs to be developed to prevent n-heptane from cracking while promoting the conversion of n-heptane to multi-branched isomers [5]. SO 4 2− /ZrO 2 catalysts have attracted significant attention because of their ability to isomerize light alkanes at low temperature, but suffer from the disadvantages of deactivation and possibly from sulfur loss during reaction and regeneration, limiting their applicability in isomerization.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Cr2O3 Promoter on Pt/WO3-ZrO2 Catalysts for n-Heptane Isomerization

Zhang

Zhao

et al. 2018

Catalysts

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Isomerate, the product of a light naphtha Isomerization unit, is a clean, high-octane gasoline blending component, which is free of sulfur content, aromatics, and olefins. However, the isomerization of the long-chain alkanes, such as n-heptane, is pretty difficult. As a result, this process has not been commercialized yet. In recent years, much attention has been paid to Pt/WO 3 /ZrO 2 as an n-heptane isomerization catalyst due to its good thermal stability, strong acidity, simplicity of preparation, reusability and good isomerization activity. In this work, the Pt/WO 3 /ZrO 2 catalyst was modified by various loading of metal Cr to improve the catalytic performance. The effects of WO 3 content, Cr metal loading and calcination temperature on the catalyst characters and catalytic activity were studied. It is shown that Cr-Pt/WO 3 /ZrO 2 with the loading of 18 wt% WO 3 and 1.0-1.4 wt% Cr, prepared at the calcination temperature of 800 • C, has the highest activity. It was found that the octane number increases by 28 units through the isomerization of light naphtha feedstocks. In addition, the study on the stability of Cr-Pt/WO 3 /ZrO 2 indicates that the catalyst is not deactivated after 500 h of the n-heptane isomerization reaction.Arata and Hino [6] because of its good stability both in reducing and oxidizing conditions [7]. While the WO 3 /ZrO 2 type catalyst shows high selectivity in the isomerization reaction of linear alkane, the catalyst activity is relatively low and the degree of cracking is too high [8]. Thus, the catalyst needs to be modified to meet the industrial production requirements. The catalyst consisting of Pt deposited on WO 3 /ZrO 2 for n-heptane isomerization has attracted the attention of a large number of researchers as the most promising catalyst [9,10]. The structure of the WO 3 /ZrO 2 catalyst varies depending on the WO 3 content [11,12], leading to different catalyst activities. The structure and properties of this kind of catalyst can be modified by changing the WO 3 content [13]. While most researchers believe that the best catalytic activity is obtained when WO 3 is highly dispersed on the surface of the catalyst, there has been some debate about this subject. It was shown that the catalyst has better catalyst activity with the WO 3 density of seven-eight atoms·nm −2 [14,15]. Many researchers have found that the addition of small amounts of metals such as Fe, Al, In, and Ga to Pt/WO 3 /ZrO 2 enhances catalysis and stability of n-heptane isomerization, and it was demonstrated that Cr can be used as a modifier in Pt/WO 3 /ZrO 2 catalysts. Based on economic considerations, Cr metal is a more cost-effective option, and is therefore a more suitable for industrial production than Ga metal [16][17][18]. In this work, n-heptane isomerization over Cr-promoted Pt/WO 3 /ZrO 2 was studied and compared to that over Pt/WO 3 /ZrO 2 . Results and Discussion Effect of Cr 2 O 3 Loading on Pt/ WO 3 /ZrO 2 Characterization of the CatalystsThe XRD patterns of Cr-Pt/WZ catalysts with different Cr loading ...

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n-Heptane isomerization over Pt/WO3-ZrO2: A kinetic study

Cited by 32 publications

References 33 publications

Adjacent Pt Nanoparticles and Sub-nanometer WO _x Clusters Determine Catalytic Isomerization of C ₇ H ₁₆

Adjacent Pt Nanoparticles and Sub-nanometer WO _x Clusters Determine Catalytic Isomerization of C ₇ H ₁₆

n-Heptane Isomerization Activities of Pt Catalyst Supported On Micro/Mesoporous Composites

Effect of the Cr2O3 Promoter on Pt/WO3-ZrO2 Catalysts for n-Heptane Isomerization

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n-Heptane isomerization over Pt/WO3-ZrO2: A kinetic study

Cited by 32 publications

References 33 publications

Adjacent Pt Nanoparticles and Sub-nanometer WO x Clusters Determine Catalytic Isomerization of C 7 H 16

Adjacent Pt Nanoparticles and Sub-nanometer WO x Clusters Determine Catalytic Isomerization of C 7 H 16

n-Heptane Isomerization Activities of Pt Catalyst Supported On Micro/Mesoporous Composites

Effect of the Cr2O3 Promoter on Pt/WO3-ZrO2 Catalysts for n-Heptane Isomerization

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Adjacent Pt Nanoparticles and Sub-nanometer WO _x Clusters Determine Catalytic Isomerization of C ₇ H ₁₆

Adjacent Pt Nanoparticles and Sub-nanometer WO _x Clusters Determine Catalytic Isomerization of C ₇ H ₁₆