ZnxZr/HZSM-5 as efficient catalysts for alkylation of benzene with carbon dioxide

Cheng, Junjun; Zhao, Yitao; Xu, Guohao; Zhang, Peng; Zhu, Xuedong; Yang, Fan

doi:10.1007/s11705-022-2215-6

Cited by 2 publications

(3 citation statements)

References 40 publications

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“…Light aromatics, especially BTX (benzene, toluene, and xylene) are fairly important basic raw materials that find applications in pharmacy, synthetic fibers, solvents, etc., which are usually obtained by the catalytic reforming of naphthalene [1][2][3][4]. It is of great importance to explore alternative strategies for BTX production to address concerns about crude oil depletion.…”

Section: Introductionmentioning

confidence: 99%

Disinfectant-Assisted Preparation of Hierarchical ZSM-5 Zeolite with Excellent Catalytic Stabilities in Propane Aromatization

Zhang,

Zhuang,

et al. 2024

Nanomaterials

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A series of quaternary ammonium or phosphonium salts were applied as zeolite growth modifiers in the synthesis of hierarchical ZSM-5 zeolite. The results showed that the use of methyltriphenylphosphonium bromide (MTBBP) could yield nano-sized hierarchical ZSM-5 zeolite with a “rice crust” morphology feature, which demonstrates a better catalytic performance than other disinfect candidates. It was confirmed that the addition of MTBBP did not cause discernable adverse effects on the microstructures or acidities of ZSM-5, but it led to the creation of abundant meso- to marco- pores as a result of aligned tiny particle aggregations. Moreover, the generation of the special morphology was believed to be a result of the coordination and competition between MTBBP and Na+ cations. The as-synthesized hierarchical zeolite was loaded with Zn and utilized in the propane aromatization reaction, which displayed a prolonged lifetime (1430 min vs. 290 min compared with conventional ZSM-5) and an enhanced total turnover number that is four folds of the traditional one, owing to the attenuated hydride transfer reaction and slow coking rate. This work provides a new method to alter the morphological properties of zeolites with low-cost disinfectants, which is of great potential for industrial applications.

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Section: Introductionmentioning

confidence: 99%

Disinfectant-Assisted Preparation of Hierarchical ZSM-5 Zeolite with Excellent Catalytic Stabilities in Propane Aromatization

Zhang,

Zhuang,

et al. 2024

Nanomaterials

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“…Therefore, it is of commercial and scientific interest to convert excessive benzene to valuable toluene or xylene through an alkylation reaction. Current approaches mainly focus on using methanol, − syngas, − methane, , or CO 2 − as the methylation reagents to react with benzene. Among these, CO 2 -coupled benzene alkylation is considered as a doubly beneficial route, which can not only increase the production of the high value-added toluene and xylene but also utilize CO 2 to alleviate the greenhouse effect …”

Section: Introductionmentioning

confidence: 99%

“…Tandem catalysis processes typically require relatively high temperatures to promote C–C coupling reactions, where the reversed water gas shift (RWGS) reaction becomes the main side reaction. By tuning the oxygen vacancies of the oxide, the conversion and usage of CO 2 could be improved, and the selectivity of CO could be suppressed. − ,, Due to the rich adjustable acidic sites, suitable microporous structure, and unique shape selectivity, HZSM-5 has been widely used as a zeolite component in OXZEO catalysts for benzene alkylation with CO 2 /H 2 . By tuning the acid properties of HZSM-5, the product distribution toward xylene/toluene and catalyst stability could be optimized.…”

Section: Introductionmentioning

confidence: 99%

Integration of Nano-Sized HZSM-5 with ZnZrO_x as a Bifunctional Catalyst to Boost Benzene Alkylation with Carbon Dioxide and Hydrogen

Yin,

Fu,

et al. 2023

ACS Sustainable Chem. Eng.

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Benzene alkylation with CO2/H2 is a doubly beneficial option to upgrade benzene toward valuable products, in which benzene can be converted into valuable toluene and xylene, while CO2 can be utilized as an alkylation reagent to mitigate the greenhouse effect. It is quite challenging to ascertain the critical rule of zeolite regulation for the synergistic effect in oxide-zeolite composite (OXZEO) catalysts, a series of bifunctional catalysts were investigated in this work, consisting of ZnZrO x solid solution and nano-sized HZSM-5 with uniform size distribution and distinct acid properties. Key parameters affecting the catalyst performance were analyzed and optimized in this tandem reaction, namely, the mass ratio of two components, the SiO2/Al2O3 ratio of HZSM-5, and the proximity between ZnZrO x and HZSM-5. Due to the increased active site accessibility originating from nano-sized HZSM-5, the combined selectivity of toluene and xylene reaches 94.6% at 31.3% benzene conversion, respectively. Moreover, low ethylbenzene selectivity (<1%) has been achieved. It is worth noting that the long-term stability test indicates a faster deactivation in the nano-sized HZSM-5 system as compared with the micro-sized counterpart. Based on EDS mappings, it is found that nano-sized HZSM-5 experiences a more severe metal migration issue, resulting in lower catalyst stability. The reaction mechanism with formate-methoxy intermediates and the synergistic effect of CO2 hydrogenation-alkylation were further confirmed by in situ diffuse reflectance infrared Fourier transformations spectroscopy and gas chromatography–mass spectrometry. By correlating zeolite size and acidity with catalytic performances, these findings could facilitate the further rational design of OXZEO catalysts toward CO2 catalytic conversions.

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ZnxZr/HZSM-5 as efficient catalysts for alkylation of benzene with carbon dioxide

Cited by 2 publications

References 40 publications

Disinfectant-Assisted Preparation of Hierarchical ZSM-5 Zeolite with Excellent Catalytic Stabilities in Propane Aromatization

Disinfectant-Assisted Preparation of Hierarchical ZSM-5 Zeolite with Excellent Catalytic Stabilities in Propane Aromatization

Integration of Nano-Sized HZSM-5 with ZnZrO_x as a Bifunctional Catalyst to Boost Benzene Alkylation with Carbon Dioxide and Hydrogen

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ZnxZr/HZSM-5 as efficient catalysts for alkylation of benzene with carbon dioxide

Cited by 2 publications

References 40 publications

Disinfectant-Assisted Preparation of Hierarchical ZSM-5 Zeolite with Excellent Catalytic Stabilities in Propane Aromatization

Disinfectant-Assisted Preparation of Hierarchical ZSM-5 Zeolite with Excellent Catalytic Stabilities in Propane Aromatization

Integration of Nano-Sized HZSM-5 with ZnZrOx as a Bifunctional Catalyst to Boost Benzene Alkylation with Carbon Dioxide and Hydrogen

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Integration of Nano-Sized HZSM-5 with ZnZrO_x as a Bifunctional Catalyst to Boost Benzene Alkylation with Carbon Dioxide and Hydrogen