The effect of palladium loading on the catalytic performance of Pd/SAPO-11 for n-decane hydroisomerization

Song, Xuemei; Bai, Xuefeng; Wu, Wei; Kikhtyanin, Oleg; Zhao, Aijuan; Xiao, Linfei; Su, Xiaofang; Zhang, Jianwei; Wei, Xiaomeng

doi:10.1016/j.mcat.2016.12.017

Cited by 38 publications

(24 citation statements)

References 41 publications

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“…As shown in Figure a, for S‐11 molecular sieve, a steep uptake of N 2 occurs at P/P 0 = 0.01, indicating the micropore properties. In addition, a hysteresis loop appears at P/P 0 = 0.6–1.0, confirming the presence of mesopores derived from the assembly of crystallites . The lower surface area and pore volume of Pt/S‐11 than S‐11 is attributed to blockage of pore by Pt.…”

Section: Resultsmentioning

confidence: 68%

“…In addition, the tests indicate that the amount of Pt sites matches acidic sites of support even at lower loading of 0.035 wt% and the metal function is saturated when the Pt loading reaches 0.15 wt% for V‐Pt/S‐11. The isomer yield of 88.2% was still obtained at 320 °C for V‐0.035Pt/S‐11 catalyst . When Pt loading decrease from 0.15 to 0.035 wt%, there is only a decrease in activity, which can be compensated by increasing reaction temperature (Figure S2d–f, Supporting Information).…”

Section: Resultsmentioning

confidence: 96%

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Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

et al. 2019

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The significant increase of catalytic efficiency while remaining low Pt usage is constantly pursued, but remains a challenge. Here, a “vacuum‐assisted” (VA) process toward Pt clusters dispersed on SAPO‐11 (S‐11) is shown for a high‐effective hydroisomerization of n‐C16. The VA can make effective trapping of the Pt precursor on S‐11 due to intensive capillary action, being conductive to stabilize and disperse Pt cluster (≈1 nm) on S‐11 (V‐Pt/S‐11) for promoting synergy of Pt sites and acid sites on S‐11. The test indicates excellent catalytic activity and stability of trace Pt clusters (0.15 wt%, even lower, 0.035 wt%) on S‐11 (≈94.4% isomer selectivity at 94.3% conversion), much superior to I‐0.15 wt% Pt/S‐11 from traditional impregnation routes (≈88% selectivity at 90% conversion) and ever reported catalysts. The V‐Pt/S‐11 is also superior for the hydroisomerization of catalytic diesel oil with a decrease of freezing point up to 40 °C after hydroisomerization. The superior performance is attributed to the exposure of high acid density due to little coverage of Pt cluster on S‐11, high dispersion of Pt leading to form more metal–acid bifunctional sites, and enhanced (de)hydrogenation ability of Pt clusters. All of them can promote the effective synergy of metal sites (Pt) and acid sites.

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Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 96%

Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

et al. 2019

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“…The balance between metal and Brønsted acid sites plays a vital role in determining the selectivity of the catalyst; high metal site density limits the formation of multiply branched isomers by promoting hydrogenation of the primary isomerization products, an issue that has received relatively little attention, with only a few reports so far [28]. Metal dispersion, metal loading, acidity and density of acid sites, and porous channel system effect are also key properties for determining the catalyst selection and experimental design [29][30][31][32].…”

Section: Hydroisomerization/isomerization For Upgrading Vegetable Oilmentioning

confidence: 99%

Catalytic Hydroisomerization Upgrading of Vegetable Oil-Based Insulating Oil

Phan

Lee

2018

Catalysts

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Due to its high biodegradability, high dielectric strength, and good thermal stability, vegetable oil is under consideration as an alternative transformer fluid for power system equipment, replacing traditional petroleum-based insulating oils. Its main drawbacks are its poor low-temperature properties arising from the crystallization of its long-chain normal paraffins, and its lower oxidative stability arising from its higher concentration of unsaturated fatty acids. Hydroisomerization/isomerization over bifunctional catalysts is considered to be an efficient pathway to upgrade vegetable oil-based insulating oil; this converts saturated/unsaturated long-chain fatty acids to branched isomers. The efficiency of this process depends crucially on the behavior of the catalyst system. This paper extensively reviews recent results on the influence that the metal phase and acidity, the effects of pore channels, and the balance between metal and acid sites have upon the activity and selectivity of catalytic hydroisomerization.

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“…Isomerization of n-paraffin to branched paraffin is important in petroleum refining industry for improving motor fuels properties such as high gasoline octane number [4], diesel fuel with high cetane number, low pour point and high viscosity index. To accomplish high isomerization selectivity; balance between the active component (metal) and acid functions is needed [5].…”

Section: -Introductionmentioning

confidence: 99%

Experimental Study of Iraqi Light Naphtha Isomerization over Ni-Pt/H-Mordenite

Hussain¹,

Mohammed²

2019

IJCPE

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Hydroisomerization of Iraqi light naphtha was studied on prepared Ni-Pt/H-mordenite catalyst at a temperature range of 220-300°C, hydrogen to hydrocarbon molar ratio of 3.7, liquid hourly space velocity (LHSV) 1 hr -1 and at atmospheric pressure. The result shows that the hydrisomerization of light naphtha increases with the increase in reaction temperature at constant LHSV. However, above 270 0 C the isomers formation decreases and the reaction is shifted towards the hydrocracking reaction, a higher octane number of naphtha was formed at 270 °C.

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The effect of palladium loading on the catalytic performance of Pd/SAPO-11 for n-decane hydroisomerization

Cited by 38 publications

References 41 publications

Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

Trace Pt Clusters Dispersed on SAPO‐11 Promoting the Synergy of Metal Sites with Acid Sites for High‐Effective Hydroisomerization of n‐Alkanes

Catalytic Hydroisomerization Upgrading of Vegetable Oil-Based Insulating Oil

Experimental Study of Iraqi Light Naphtha Isomerization over Ni-Pt/H-Mordenite

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