Optimizing preparative conditions for tungstated zirconia modified with platinum as catalyst for heptane isomerization

Jermy, B. Rabindran; Khurshid, Muneeb; Al-Daous, Mohammed A.; Hattori, Hideshi; Al-Khattaf, S.

doi:10.1016/j.cattod.2010.10.022

Catalysis Today

2011

DOI: 10.1016/j.cattod.2010.10.022

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Optimizing preparative conditions for tungstated zirconia modified with platinum as catalyst for heptane isomerization

B. Rabindran Jermy

Muneeb Khurshid

Mohammed A. Al-Daous

et al.

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Cited by 28 publications

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“…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.…”

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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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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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Bulk and surface characterization and isomerization activity of Pt/WO4 2−/ZrO2 catalysts of different preparations

Kuznetsov

Kazbanova

Кузнецова

et al. 2014

Reac Kinet Mech Cat

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The texture, phase and surface composition and acidity of impregnated and precipitated Pt/WO 4 2-/ZrO 2 catalysts have been investigated with XRD, XPS, FTIR spectroscopy, and BET measurements. It has been shown that increasing the tungstate ion concentration in hydrated zirconium oxide results in an increase in the t-ZrO 2 fraction in the catalysts following high temperature activation. While a fraction of W 6? and W 5? cations forms a solid solution with zirconia, the remaining W ions are stabilized on the catalysts surface as (-WO x -) n clusters. The catalytic activity in n-heptane isomerization seems to correlate with catalyst surface acidity to reach the greatest value at the WO 4 2-concentration in the range of 12.9-17.6 mol %.

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Features of the phase composition, acidity, and isomerization activity of Pt/WO3/ZrO2 catalysts

et al. 2020

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Optimizing preparative conditions for tungstated zirconia modified with platinum as catalyst for heptane isomerization

Cited by 28 publications

References 15 publications

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

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

Bulk and surface characterization and isomerization activity of Pt/WO4 2−/ZrO2 catalysts of different preparations

Features of the phase composition, acidity, and isomerization activity of Pt/WO3/ZrO2 catalysts

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