Micro-mesoporous catalysts based on ZSM-5 zeolite synthesized from natural clay nanotubes: Preparation and application in the isomerization of C-8 aromatic fraction

Demikhova, N. R.; Рубцова, М.Ю.; Kireev, G. A.; Cherednichenko, Kirill A.; Винокуров, В. А.; Glotov, Aleksandr

doi:10.1016/j.cej.2022.139581

Cited by 20 publications

(8 citation statements)

References 54 publications

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“…A ZSM-5 molecular sieve is a widely used microporous substance. Due to its excellent properties, it has been studied by many experts [ 1 , 2 , 3 , 4 ]. The special framework structure of the ZSM-5 molecular sieve provides it with unique shape selectivity, thermal stability, and acid resistance [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation of a High-Silicon ZSM-5 Molecular Sieve Using Only Coal Gangue as the Silicon and Aluminum Sources

Zheng

Zhou

et al. 2023

Materials

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The traditional preparation of ZSM-5 molecular sieves relies on chemical reagents to provide silicon and aluminum sources, which are limited as raw materials and cannot be commonly used in production practice. Using coal gangue as the raw material and using medium-temperature chlorination roasting and the pressure acid leaching process to control the silicon–aluminum ratio [n(Si/Al)] of coal gangue, a ZSM-5 molecular sieve was prepared using the alkali melting hydrothermal method. The pressure acid leaching process solved the limitation that kaolinite and mica cannot simultaneously be activated. Under optimal conditions, the n(Si/Al) of the coal gangue increased from 6.23 to 26.14 and complied with the requirements for the synthesis n(Si/Al) of a ZSM-5 molecular sieve. The effect of n(Si/Al) on the preparation of the ZSM-5 molecular sieve was studied. Finally, spherical granular ZSM-5 molecular sieve material with a microporous specific surface area of 169.6329 m2/g, an average pore diameter of 0.6285 nm, and a pore volume of 0.0988 cm3/g was prepared. Providing ideas for the high-value utilization of coal gangue, it is significant for solving the problem of coal gangue solid waste, as well as the problem of ZSM-5 molecular sieve feed stock.

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Section: Introductionmentioning

confidence: 99%

Preparation of a High-Silicon ZSM-5 Molecular Sieve Using Only Coal Gangue as the Silicon and Aluminum Sources

Zheng

Zhou

et al. 2023

Materials

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“…9−13 It is worth mentioning that the ZSM-5 zeolite has three-dimensional pores (5.1 Å × 5.5 Å and 5.3 Å × 5.6 Å) close to the dynamic diameter of PX, which are smaller than MX and OX. 12,14 Therefore, ZSM-5 has high shape selectivity and provides a high p-xylene/o-xylene ratio in the xylene isomerization reaction. 15 As the most suitable catalyst support for the isomerization of C8 aromatics, the low Si/Al ratio HZSM-5 has strong acidity 12,16 and shows high catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

“…19,23 Previous investigations have demonstrated the excellent effect of Pt metal on hydrogenation and the inhibition of coke generation. 14,24 Many previous studies have shown that the dealkylation process of EB relies on bifunctional catalysts. 6,8,25 Hu et al 23 reported that ZSM-5 (Si/Al = 30) was modified by Pt and Si, and the conversion rate of EB in the xylene isomerization reaction was 93.45%.…”

Section: Introductionmentioning

confidence: 99%

“…This is mainly due to the lack of shape selectivity of the external surface acidity of ZSM-5. , Some investigations proved that the deposition of SiO 2 covers the acidic sites on the external surface of the ZSM-5 zeolite and has no effect on the acidity of the internal surface. − At the same time, the deposition of SiO 2 improves the shape selectivity of the catalyst . In the isomerization of C8 aromatics, carbon deposition is an important factor in catalyst deactivation. , Previous investigations have demonstrated the excellent effect of Pt metal on hydrogenation and the inhibition of coke generation. , Many previous studies have shown that the dealkylation process of EB relies on bifunctional catalysts. ,, Hu et al reported that ZSM-5 (Si/Al = 30) was modified by Pt and Si, and the conversion rate of EB in the xylene isomerization reaction was 93.45%. However, because the external surface of the Pt/ZSM-5 catalyst was passivated by SiO 2 , the yield of PX was only 1.37%.…”

Section: Introductionmentioning

confidence: 99%

“…The isomerization of C8 aromatics is mainly an acid-catalyzed reaction . Currently, industrial xylene isomerization catalysts are mainly prepared based on zeolite. ,, Zeolite has the advantages of high stability, high specific surface area, abundant pores, and acid sites density. − It is worth mentioning that the ZSM-5 zeolite has three-dimensional pores (5.1 Å × 5.5 Å and 5.3 Å × 5.6 Å) close to the dynamic diameter of PX, which are smaller than MX and OX. , Therefore, ZSM-5 has high shape selectivity and provides a high p -xylene/ o -xylene ratio in the xylene isomerization reaction …”

Section: Introductionmentioning

confidence: 99%

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Novel Composite Catalysts Efficiently Catalyze C8 Aromatics by Controlling the Reaction Pathway

Miao

Wang

Zhao

et al. 2022

Ind. Eng. Chem. Res.

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Pt-3Si/Z20 and 3La/Z113 catalysts were prepared by modifying high Si/Al ratio ZSM-5 and low Si/Al ratio ZSM-5, respectively. Here, a high-performance composite catalyst was prepared by combining two catalysts (Pt-3Si/Z20 and 3La/Z113) with different functions. Many techniques were performed to characterize the catalysts. The composite catalyst has multiple active sites with different functions by integrating the properties of the two catalysts. The efficient synergistic effects of dealkylation and isomerization are applied to the complex C8 aromatics reaction. The reaction pathways of ethylbenzene, m-xylene, and o-xylene in C8 aromatics were successfully controlled. Additionally, we found that the different spatial arrangements of the two catalysts had effects on the xylene losses of the catalysts. This could be attributed to the disproportionation of p-xylene during the reaction. At 360 °C, EB conversion, PX yield, and xylene loss were 71.6%, 23.2%, and 1.75%, respectively. This work has important guiding significance for the industrial production of p-xylene.

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Hydrothermal synthesis of high crystallinity ZSM-5 zeolite from coal gasification coarse slag and mother liquor circulation for efficient coal chemical wastewater purification

Ma,

Li,

Xiao

et al. 2024

Environ Sci Pollut Res

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Micro-mesoporous catalysts based on ZSM-5 zeolite synthesized from natural clay nanotubes: Preparation and application in the isomerization of C-8 aromatic fraction

Cited by 20 publications

References 54 publications

Preparation of a High-Silicon ZSM-5 Molecular Sieve Using Only Coal Gangue as the Silicon and Aluminum Sources

Preparation of a High-Silicon ZSM-5 Molecular Sieve Using Only Coal Gangue as the Silicon and Aluminum Sources

Novel Composite Catalysts Efficiently Catalyze C8 Aromatics by Controlling the Reaction Pathway

Hydrothermal synthesis of high crystallinity ZSM-5 zeolite from coal gasification coarse slag and mother liquor circulation for efficient coal chemical wastewater purification

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