Enhanced aromatics selectivity and stability in a coaromatization reaction over P/[ZnCr]/HZSM-5

Lv, Junmin; Wang, Dan; Zhu, Bing; Li, Haibo; Fan, Shangwu; Zhao, Tiansheng

doi:10.1039/d2re00459c

React. Chem. Eng.

2023

DOI: 10.1039/d2re00459c

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Enhanced aromatics selectivity and stability in a coaromatization reaction over P/[ZnCr]/HZSM-5

Junmin Lv

Dan Wang

Bing Zhu

et al.

Abstract: Coaromatization reaction is an effective process for heat-coupling and safety. The comparison study of [ZnCr]/HZSM-5 with P/[ZnCr]/HZSM-5 in coaromatization of methanol and n-hexane was performed. The relative properties of catalysts...

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Cited by 2 publications

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Intensified Alkylation Reaction to Improve the p-Xylene Yield in Coaromatization of n-Hexane and Methanol

Li,

Yin,

Wang

et al. 2024

Ind. Eng. Chem. Res.

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The coaromatization of light alkane and methanol is an attractive nonpetroleum pathway balancing the heat to produce high-value aromatics, but achieving high p-xylene (pX) selectivity is a challenging topic. Here, we present a two-stage tandem catalysis for alkylation intensification. [Zn,Ga]/ZSM-5 was used in the first-stage reactor for the coaromatization to provide sufficient aromatics. The HZSM-5@SiO2 catalysts were prepared for alkylation reaction and characterized by means of X-ray diffraction, N2 adsorption/desorption, transmission electron microscopy, and Fourier transform infrared with pyridine. The feasibility to enhance xylene and pX was verified by introducing methanol in the second stage to intensify the alkylation of aromatics. Higher SiO2/Al2O3 ratio benefits for xylene and the elimination of external acid sites benefits for pX were found. The pX selectivity and yield and the alkylation efficiency of methanol were significantly increased over HZSM-5@SiO2 in the coaromatization system of n-hexane and methanol. The pX selectivity and yield were increased to 57.41% and 13.12 wt % over Z50@20P. Moreover, the deactivation of HZSM-5@SiO2 was investigated in detail.

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Intensified Alkylation Reaction to Improve the p-Xylene Yield in Coaromatization of n-Hexane and Methanol

Li,

Yin,

Wang

et al. 2024

Ind. Eng. Chem. Res.

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Review—MOS-Based Benzene, Toluene, Ethylbenzene, and Xylene Gas Sensors

Sharma,

Shekhawat,

Nakate

et al. 2024

J. Electrochem. Soc.

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Gas sensing technology has evolved over the last 50 years but there has been a lacuna to understand the sensing mechanism. The understanding becomes even more complicated when gases like Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX) are sensed using conventional gas sensors. BTEX gases have inert chemical behaviour, making it difficult to detect such gases using the widely explored metal-oxide-semiconductors (MOS). BTEX gases are generated in petroleum and other industries and hence their detection at low ppm is a necessity as it is carcinogenic in nature and possesses a threat to human health. For efficient sensing of such gases, a variety of materials including quantum dots, nano-flakes of different geometry, carbon-based materials etc are being explored. This review focuses on the different materials and their properties which makes them efficient sensors to detect BTEX gases. Polymer-based materials are out of the scope of this review article as the topic deserves a separate article because of its vastness. In future scope, probable materials which can prove to be a good BTEX gas sensor are discussed.

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Enhanced aromatics selectivity and stability in a coaromatization reaction over P/[ZnCr]/HZSM-5

Abstract: Coaromatization reaction is an effective process for heat-coupling and safety. The comparison study of [ZnCr]/HZSM-5 with P/[ZnCr]/HZSM-5 in coaromatization of methanol and n-hexane was performed. The relative properties of catalysts...

Cited by 2 publications

References 34 publications

Intensified Alkylation Reaction to Improve the p-Xylene Yield in Coaromatization of n-Hexane and Methanol

Intensified Alkylation Reaction to Improve the p-Xylene Yield in Coaromatization of n-Hexane and Methanol

Review—MOS-Based Benzene, Toluene, Ethylbenzene, and Xylene Gas Sensors

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