Effect of Zeolite Properties on Dewaxing by Isomerization of Different Hydrocarbon Feedstocks

Nikiforov, Vladimir; Kashin, Evgeniy V.; Pigoleva, Irina V.; Maslov, I. A.; Фадеев, В. В.; Zaglyadova, S. V.

doi:10.1021/acs.energyfuels.9b00289

Cited by 12 publications

(4 citation statements)

References 14 publications

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“…Bifunctional catalysts comprising acid and hydrogenationdehydrogenation functions are at the heart of the petroleum refining industry (e. g. hydroisomerization of C 5 À C 6 , [1] hydrocracking of heavy oil cuts, [1][2] dewaxing by hydroisomerization [3] ). Due to their flexibility towards different products [2,4] and the number of solutions available to tackle different catalyst poisons, [2] bifunctional catalysts will also play a key role in the production of sustainable fuels from a panoply of feedstocks (e. g. vegetable oils, [5] Fischer-Tropsch waxes, [6] (pyrolyzed) plastic waste [7] ).…”

Section: Introductionmentioning

confidence: 99%

Bifunctional Intimacy and its Interplay with Metal‐Acid Balance in Shaped Hydroisomerization Catalysts

et al. 2020

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The combined impact of platinum location and metal-acid balance on the catalytic performances of HUSY zeolite aluminashaped bifunctional catalysts was evaluated in n-hexadecane hydroconversion reaction. For well-balanced catalysts, the deposition of Pt in the alumina resulted in lower isomerization selectivity as compared to when platinum was located in the zeolite. In the latter case, the maximal distance between Pt and acid sites was found to be in the nanometric scale (high intimacy) whereas in the former it was in the micrometric scale (low intimacy), particularly due to the presence of large clusters of HUSY zeolite. Nevertheless, whenever proper balance between functions was not ensured in high-intimacy catalysts, the low-intimacy and well-balanced catalysts were shown to perform better. The requirement for nanometric metal-acid sites intimacy must be hence combined with an adequate metal-acid balance to achieve optimal catalytic performance.

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Section: Introductionmentioning

confidence: 99%

Bifunctional Intimacy and its Interplay with Metal‐Acid Balance in Shaped Hydroisomerization Catalysts

et al. 2020

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“…21,24−26 For example, essentially the same dewaxed product yields were obtained on the catalysts based on the ZSM-23 and SAPO-11 zeolites during dewaxing of hydrocracked oil (hydrocracker bottom). 27 A significant decrease in product yield was observed for the catalyst based on ZSM-12, which had the widest channels among the zeolites studied. Low yields when using Pt/MTW could be explained by extensive n-paraffin cracking.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

“…When comparing yield vs CFPP curves (Figure C), it is clear that the catalysts based on ZSM-23, ZSM-22, and SAPO-11, which are characterized by narrower channel sizes among compared zeolites, provide approximately the same yields of dewaxed products. The studies of the hydroisomerization of C 7+ paraffins have pointed toward similar selectivity of the catalysts based on these 1-D, 10-R zeolites, despite differences in their acidity. ,− For example, essentially the same dewaxed product yields were obtained on the catalysts based on the ZSM-23 and SAPO-11 zeolites during dewaxing of hydrocracked oil (hydrocracker bottom) …”

Section: Resultsmentioning

confidence: 98%

Effect of the Zeolite Type on Catalytic Performance in Dewaxing of the Diesel Fraction under Sour Conditions

Kosareva¹,

Nikiforov²,

Maslov³

et al. 2021

Energy Fuels

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Dewaxing by isomerization is widely used to produce winter and arctic grades of diesel fuel. Preliminary feed hydrotreatment and pure hydrogen are usually used in order to avoid poisoning of the catalyst by sulfur and nitrogen. However, combining hydrotreatment and dewaxing in one reactor has some advantages, such as lower capital and operating costs. In such a configuration, a dewaxing catalyst works in sour environments, defined by sulfur and nitrogen presented in the feed stream. In the presented work, Pt-containing catalysts based on commercial zeolites with one-dimensional channels and their mixtures (ZSM-23, ZSM-22, ZSM-12, EU-2, SAPO-11, ZSM-23+ZSM-12, and ZSM-23+EU-2) were prepared, characterized using different analytical techniques (X-ray diffraction, scanning electron microscopy, transmission electron microscopy, inductively coupled plasma atomic emission spectroscopy, N2 sorption, and infrared spectroscopy), and tested in dewaxing of the diesel fraction under sour conditions. It was found that catalyst activity, dewaxed product yield, and quality indicators (aromatic hydrocarbon content and density) were highly sensitive to zeolite channel size, while catalyst acidity and zeolite crystal size were less important factors. The highest activity was shown by catalysts based on EU-2 and ZSM-12, which had the widest channels. The highest product yield was observed for the catalyst based on EU-2, which had a medium channel size among compared zeolites. Wider zeolite channels promoted the metal function of catalysts that led to a decrease in the aromatic hydrocarbon content of dewaxed products. Using the mixtures of ZSM-23+ZSM-12 and ZSM-23+EU-2 did not lead to visible synergetic effects. Using different binder materials (Al2O3, TiO2, and ZrO2) did not significantly affect the quality or yield of dewaxed products.

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“…Due to the properties of high acidity, high thermal stability, and selectivity, zeolites have been successfully used in various catalytic reactions such as catalytic cracking [7], ethanol dehydration reaction [8], hydrogenation reaction [9], oxidation reaction [10], and isomerization reaction [11]. Homogeneous catalysts and zeolites of basic active sites were used in the isomerization reaction of the glucose in fructose and were not successful [12,13].…”

Section: Introductionmentioning

confidence: 99%

Catalytic conversion of glucose in fructose utilizing high-silica zeolite Sn-ZSM-12

Silva

Santos

et al. 2020

Cerâmica

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Tin incorporation in high-silica ZSM-12 zeolite was evaluated using different concentrations of tin and different structure-directing agents (SDA), in order to be used in the glucose isomerization reaction in fructose. The tetraethylammonium hydroxide SDA successfully formed the structure of the high silica zeolite ZSM-12; however, in this system, the addition of Sn prevented the formation of the ZSM-12 zeolite. Therefore, tetraethylammonium bromide was used as SDA, but the syntheses of high-silica ZSM-12 zeolite without and with tin incorporation were not effective. Then methyltriethylammonium chloride was used as SDA, and the high-silica ZSM-12 structure was formed only with the incorporation of tin. The samples with ZSM-12 structure and different concentrations of tin were evaluated in reaction of glucose conversion to fructose. It was found that the sample with the lowest tin content ( Sn / Si = 0 . 005 ) achieved the highest glucose conversion and the highest fructose yield.

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Effect of Zeolite Properties on Dewaxing by Isomerization of Different Hydrocarbon Feedstocks

Cited by 12 publications

References 14 publications

Bifunctional Intimacy and its Interplay with Metal‐Acid Balance in Shaped Hydroisomerization Catalysts

Bifunctional Intimacy and its Interplay with Metal‐Acid Balance in Shaped Hydroisomerization Catalysts

Effect of the Zeolite Type on Catalytic Performance in Dewaxing of the Diesel Fraction under Sour Conditions

Catalytic conversion of glucose in fructose utilizing high-silica zeolite Sn-ZSM-12

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