USY zeolites with tunable mesoporosity designed by controlling framework Fe content and their catalytic cracking properties

Guo, Dongdong; Shen, Baojian; Qin, Yuchen; Sun, Jianxue; Guo, Qiaoxia; Ren, Shenyong; Gao, Xionghou; Pang, Xinmei; Wang, Baojie; Zhao, Hongjuan; Liu, Honghai

doi:10.1016/j.micromeso.2015.02.004

Cited by 24 publications

(7 citation statements)

References 53 publications

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“…All the samples similarly showed typical diffraction peaks of Y zeolite [25], indicating that the framework structures of the reused catalysts were essentially retained. 1650 cm −1 were assigned to the framework vibrations of Y zeolite [25,26] and the 3450 cm −1 was assigned to the vibrations of the surface hydroxyl groups on Y zeolite [26]. The presence of those similar peaks further proved that the framework structures of the reused catalysts were essentially retained.…”

Section: The Reusability Of the Catalyst Naymentioning

confidence: 80%

Full N,N-Methylation of 4,4′-Methylenedianiline with Dimethyl Carbonate: A Feasible Access to 4,4′-Methylene bis(N,N-Dimethylaniline)

Qiu

Wang²,

et al. 2018

Journal of Chemistry

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The full N,N-methylation of 4,4 -methylenedianiline (MDA) with dimethyl carbonate (DMC) was investigated. The yield of the major product 4,4 -methylene bis(N,N-dimethylaniline) (MBDMA) reached as high as 97% over NaY catalyst at 190 ∘ C for 6 h. The catalyst could be used for two more times with acceptable MBDMA yields higher than 90%. The main by-products were identified as three N-methylated derivatives. Surprisingly, the formation of the N-methoxycarbonylation product was extremely restrained, which could be produced in high yields of 98% on zinc acetate catalyst. Furthermore, the reaction pathway to the major product MBDMA was proposed. Finally, a feasible synthetic route of 4,4 -methylene bis(N,N-dimethylaniline) (MBDMA) was established, featuring a high yield, mild reaction conditions, and simple operations.

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Section: The Reusability Of the Catalyst Naymentioning

confidence: 80%

Full N,N-Methylation of 4,4′-Methylenedianiline with Dimethyl Carbonate: A Feasible Access to 4,4′-Methylene bis(N,N-Dimethylaniline)

Qiu

Wang²,

et al. 2018

Journal of Chemistry

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“…It can be seen that the RC and BET surface area of the zeolites decrease with the increase of boron doping. This is because the isomorphic replacement of aluminum atoms with elements of different atomic radius, such as iron, will lead to a decrease of crystallinity and surface area of zeolites. , …”

Section: Resultsmentioning

confidence: 99%

Organic-Free Synthesis of Hierarchical ZSM-5 via a Combined Strategy of Unstable Precursors and Postsynthesis Steam Treatment

Liu

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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Hierarchical ZSM-5 has potential application in selective reaction of large compounds because of its additional mesoporosity, which can enhance the resistance against deactivation by coke, but current synthesis technology suffers from high cost and serious pollution due to the introduction of organic templates. To solve these issues, unstable ZSM-5 precursors were obtained, in which boron species were introduced into the framework of zeolite by a seed-assisted route. The subsequent steam treatment led to the formation of mesoporosity due to the hydrolysis of B–O–Si bonds and surrounding Al–O–Si bonds. As a result, the obtained hierarchical zeolites had a volume of mesoporosity from 0.09 to 0.12 cm3/g. Moreover, catalytic tests for cracking of heavy oil indicate that the obtained ZSM-5 with hierarchical pores showed excellent catalytic activity and selectivity.

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“…The Py-IR spectra of micropores and hierarchical Y-type zeolites are illustrated in Figure . The band at 1542 cm –1 results from pyridinium ions formed on Brønsted acid sites, and the band at 1452 cm –1 arises from pyridine coordination in Lewis acid sites. , The number of Brønsted acid and Lewis acid sites is obtained from the corresponding band area (presented in Table ). Compared with the microporous Y-type zeolite, the introduction of mesopores reduces the amount of Brønsted and Lewis acids, resulting in the fact that the total number of acid sites in the hierarchical Y-type zeolite is less than that of the microporous Y-type zeolite, which is in line with the characterization results of NH 3 -TPD.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Upgrading of Coal Pyrolysis Gaseous Tar over Hierarchical Y-Type Zeolites Synthesized Using a Microwave Hydrothermal Method

Yan

Liu

et al. 2019

Ind. Eng. Chem. Res.

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In this work, a series of hierarchical Y-type zeolites were rapidly synthesized using organosilane as templates through a microwave hydrothermal method. The effects of hierarchical Y-type zeolites on the product composition and the yield of light aromatics in gaseous tar from coal pyrolysis were studied. The results showed that the hierarchical Y-type zeolites showed better catalytic properties than the traditional microporous zeolite in the catalytic conversion of gaseous tar and can greatly increase the yield of light aromatics in the pyrolysis products. The hierarchical Ytype zeolite has abundant mesopores, which contribute to the access of bulky molecules into the porous channel and the contact of active sites. Meanwhile, the mesopores reduce the diffusion length of the reaction products, thus promoting the conversion of heavy components in gaseous tar to light aromatics.

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USY zeolites with tunable mesoporosity designed by controlling framework Fe content and their catalytic cracking properties

Cited by 24 publications

References 53 publications

Full N,N-Methylation of 4,4′-Methylenedianiline with Dimethyl Carbonate: A Feasible Access to 4,4′-Methylene bis(N,N-Dimethylaniline)

Full N,N-Methylation of 4,4′-Methylenedianiline with Dimethyl Carbonate: A Feasible Access to 4,4′-Methylene bis(N,N-Dimethylaniline)

Organic-Free Synthesis of Hierarchical ZSM-5 via a Combined Strategy of Unstable Precursors and Postsynthesis Steam Treatment

Catalytic Upgrading of Coal Pyrolysis Gaseous Tar over Hierarchical Y-Type Zeolites Synthesized Using a Microwave Hydrothermal Method

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