Synthesis of Ga2O3/HZSM-5@cubic ordered mesoporous SiO2 with template Pluronic F127 to improve its catalytic performance in the aromatization of methanol

Shuang, Chu; Guo, Xingcui; Li, Jian; Bai, Jin; Mu, Xindong; Yang, Lina

doi:10.1007/s10934-016-0347-0

Cited by 5 publications

(4 citation statements)

References 27 publications

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“…As the apparent active energy maintaining at similar level discussed above, this might be caused by the diffusion enhancement of mesoporous shell introduction. Such diffusion enhancement has also been reported by other groups with product distribution analysis and coke measurement 27,31 . Herein, to further verify the quantitative diffusion properties, ZLC chromatography technique was employed and the diffusional time constant of n ‐butane ( D / R 2 ) is used to represent the diffusion property.…”

Section: Resultssupporting

confidence: 60%

Core‐shell structured HZSM‐5@mesoSiO₂ catalysts with tunable shell thickness for efficient n‐butane catalytic cracking

Yang

Chen

et al. 2021

AIChE Journal

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A series of core‐shell HZSM‐5@mesoSiO2 with tunable shell thickness from 10 to 70 nm was prepared and studied for n‐butane catalytic cracking. With introducing of SiO2 shell, the catalytic performance of HZSM‐5@mesoSiO2 was largely enhanced, and n‐butane conversion rate per Al site reached to 2.43 min−1 over HZSM‐5@mesoSiO2(1:4) at 675°C which is nearly twice to that of HZSM‐5 (1.34 min−1). The diffusion property of n‐butane over as‐prepared sample was quantified by measuring the diffusional time constants using zero length column chromatography technique (ZLC). Combining with chemical reaction kinetic analysis, the quantitative relationship between diffusion property and catalytic performance was effectively established for the first time in n‐butane catalytic cracking. Positive linear correlation between diffusional time constant (D/R2) and n‐butane conversion rate per Al site could be found, which confirms that diffusion enhancement by hierarchical structure is an effective strategy to improve the activity of HZSM‐5 in catalytic cracking.

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Section: Resultssupporting

confidence: 60%

Core‐shell structured HZSM‐5@mesoSiO₂ catalysts with tunable shell thickness for efficient n‐butane catalytic cracking

Yang

Chen

et al. 2021

AIChE Journal

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“…[ 35 ] Chu et al and Guan et al used F127 as a template to successfully synthesize composite HZSM‐5@cubic ordered mesoporous SiO 2 and mesoporous Al‐SBA‐16 materials, respectively. [ 36,37 ]…”

Section: Introductionmentioning

confidence: 99%

“…[35] Chu et al and Guan et al used F127 as a template to successfully synthesize composite HZSM-5@cubic ordered mesoporous SiO 2 and mesoporous Al-SBA-16 materials, respectively. [36,37] In addition to the mentioned factors, the type of metal elements will affect the physical and chemical properties of the catalyst, such as specific surface area, thermochemical stability, and acid density. [38,39] In general, the properties of polymetallic oxides are better than those of their individual components.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of 5‐ethoxymethylfurfural from glucose catalyzed by porous tetra‐component metal oxides solid acid

Zhang

Sun

et al. 2022

Can J Chem Eng

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The production of 5-ethoxymethylfurfural (EMF) from cheap and abundant glucose feedstock has attracted a great deal of attention because of its potential applications. Herein, three porous tetra-component metal oxide solid acid catalysts (SO 4 2À /ZFSA-A, SO 4 2À /ZFSA-F-10, SO 4 2À /ZFSA-F-20)containing both Brønsted and Lewis acid sites have been successfully synthesized and can efficiently catalyze the synthesis of EMF from glucose.Particularly, the SO 4 2À /ZFSA-A, SO 4 2À /ZFSA-F-10, and SO 4 2À /ZFSA-F-20 catalysts were prepared under the template of sodium alginate, 10% F127, and 20% F127, respectively. The prepared catalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), N 2 -adsorption-desorption isotherm, X-ray photoelectron spectroscopy (XPS), thermogravimetry (TG), temperature-programmed desorption of ammonia (NH 3 -TPD), and pyridine infrared spectra (Py-FTIR). The characterization results indicated that all three catalysts have a porous structure. The pore distribution of the SO 4 2À /ZFSA-A catalyst is mainly macroporous and mesoporous, while the SO 4 2À /ZFSA-F-10 and SO 4 2À /ZFSA-F-20 catalysts are mainly mesoporous. The SO 4 2À /ZFSA-F-20 catalyst exhibited the highest catalytic performance due to its large specific surface area, desirable mesoporous structure, high total acidity (especially strong and super strong acidity), and appropriate Lewis/Brønsted acid ratio. By applying SO 4 2À / ZFSA-F-20, the formation of EMF from glucose was successfully catalyzed and EMF was obtained at a yield of 34.56% after 12 h at 160 C. This yield is much higher compared with most other results achieved by solid acids catalysis. In addition, the reaction parameters such as reaction temperature, reaction time, glucose amount, and catalyst dosage were shown to have a significant effect on the catalytic performance. Notably, the SO 4 2À /ZFSA-F-20 catalyst exhibited good reusability, as its activity did not significantly diminish after four rounds of repeated experiments and was successfully reactivated after calcination.

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“…Therefore, it is generally believed that adjusting the strength and distribution of the HZSM-5 acid sites can enhance lifetime in the glycerol aromatization process.Another way to prolong the catalysts life is changing the pore properties of HZSM-5 for overcoming the diffusion limitations and reducing coking. Research [20,21] showed hierarchical porous ZSM-5 zeolite, which facilitates the diffusion and increases the capacity of coke with its mesopores, maintains high selectivity for aromatics by micropores simultaneously. A desilication process with alkali is commonly used for the synthesis of hierarchical ZSM-5, which can also adjust the acidity properties [22].…”

mentioning

confidence: 99%

Effects of Additives and Metals on Crystallization of Nano-Sized HZSM-5 Zeolite for Glycerol Aromatization

2019

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Nano-sized HZSM-5 (n-HZSM-5) was synthesized and applied in the aromatization of glycerol. The effects of additives (carboxymethylcellulose sodium, NaCl, sodium alginate, etc.) on the chemical and physic properties of n-HZSM-5 during preparation were investigated. Metal modification was also investigated based on the synthesized n-HZSM-5. The results showed that the addition of carboxymethylcellulose sodium (CMC-Na), NaCl and sodium alginate (SA) led to forming smaller sizes of HZSM-5 and promoted the acid amounts of the catalysts, which increased its catalytic activities for obtaining BTX. The highest BTX yield of ~35% was obtained by SA derived n-HZSM-5, and the life of the catalyst were both obviously promoted by the additives with a highest of ~11 h by γ-(2,3-epoxypropoxy)propytrimethoxysilane (KH-560) derived n-HZSM-5. BTX yields could be improved by 40%by the addition of Zn and Cd in n-HZSM-5 while having little effect on the catalyst life.

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Synthesis of Ga2O3/HZSM-5@cubic ordered mesoporous SiO2 with template Pluronic F127 to improve its catalytic performance in the aromatization of methanol

Cited by 5 publications

References 27 publications

Core‐shell structured HZSM‐5@mesoSiO₂ catalysts with tunable shell thickness for efficient n‐butane catalytic cracking

Core‐shell structured HZSM‐5@mesoSiO₂ catalysts with tunable shell thickness for efficient n‐butane catalytic cracking

Synthesis of 5‐ethoxymethylfurfural from glucose catalyzed by porous tetra‐component metal oxides solid acid

Effects of Additives and Metals on Crystallization of Nano-Sized HZSM-5 Zeolite for Glycerol Aromatization

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Synthesis of Ga2O3/HZSM-5@cubic ordered mesoporous SiO2 with template Pluronic F127 to improve its catalytic performance in the aromatization of methanol

Cited by 5 publications

References 27 publications

Core‐shell structured HZSM‐5@mesoSiO2 catalysts with tunable shell thickness for efficient n‐butane catalytic cracking

Core‐shell structured HZSM‐5@mesoSiO2 catalysts with tunable shell thickness for efficient n‐butane catalytic cracking

Synthesis of 5‐ethoxymethylfurfural from glucose catalyzed by porous tetra‐component metal oxides solid acid

Effects of Additives and Metals on Crystallization of Nano-Sized HZSM-5 Zeolite for Glycerol Aromatization

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Core‐shell structured HZSM‐5@mesoSiO₂ catalysts with tunable shell thickness for efficient n‐butane catalytic cracking

Core‐shell structured HZSM‐5@mesoSiO₂ catalysts with tunable shell thickness for efficient n‐butane catalytic cracking