Exploring suitable ZSM-5/MCM-41 zeolites for catalytic cracking of n-dodecane: Effect of initial particle size and Si/Al ratio

Li, Guozhu; Diao, Zhenheng; Na, Jindan; Wang, Li

doi:10.1016/j.cjche.2015.08.010

Cited by 20 publications

(8 citation statements)

References 36 publications

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“…From small angle XRD patterns, it could be clearly demonstrated that as the content of SiO 2 increases, the intensity of diffraction peak at 2.4° which reflects the hexagonal mesophase was also increased. For wide angle XRD patterns in Figure 2b, all the samples show the characteristic diffraction peaks of MFI structure at the 2 θ of 7.8°, 8.8°, 23.2°, 23.8°, and 24.3° indicating the addition of SiO 2 would not affect the structure of HZSM‐5 during the preparation process 27 . Meanwhile, the decrease of crystallinity of composite would be the reason of decrease of HZSM‐5 ratio in the total composite as the content of SiO 2 increases.…”

Section: Resultsmentioning

confidence: 98%

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: Resultsmentioning

confidence: 98%

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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“…The conversion of n-decane cracking increased from 61.7 to 93.0% and it maintained at 89.3% after reaction for 170 min, while that of the parent ZSM-5 was just 56.4% [24]. When it was applied in n-dodecane cracking, the conversion increased by 25% and it kept a stable activity within 30 min [35]. Wang et al [25] studied the influence of alkali concentration, dissolution temperature, dissolution time and CTAB concentration on the synthesis of ZSM-5-based mesostructures in laboratory scale.…”

Section: Zeolitic Composites Of Zsm-5 and Other Materialsmentioning

confidence: 87%

“…the diffusion of molecule and the accessibility of acid sites in the micropores of ZSM-5 zeolite, thus enhancing the catalytic activity of ZSM-5 zeolite [34]. ZSM-5@MCM-41 composite zeolite was prepared by treating ZSM-5 zeolite with sodium hydroxide solution, and then the dissolved silica and aluminum were recrystallized on the surface of ZSM-5 zeolites in the form of MCM-41 in the presence of cetyltrimethylammonium bromide (CTAB) [23][24][25]35]. After addition of MCM-41, ZSM-5@MCM-41 composite exhibited more appropriate acid distribution and strength, shorter pathway length and higher external surface area.…”

Section: Zeolitic Composites Of Zsm-5 and Other Materialsmentioning

confidence: 99%

Strategies to Enhance the Catalytic Performance of ZSM-5 Zeolite in Hydrocarbon Cracking: A Review

Yang

Yan

2017

Catalysts

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ZSM-5 zeolite is widely used in catalytic cracking of hydrocarbon, but the conventional ZSM-5 zeolite deactivates quickly due to its simple microporous and long diffusion pathway. Many studies have been done to overcome these disadvantages recently. In this review, four main approaches for enhancing the catalytic performance, namely synthesis of ZSM-5 zeolite with special morphology, hierarchical ZSM-5 zeolite, nano-sized ZSM-5 zeolite and optimization of acid properties, are discussed. ZSM-5 with special morphology such as hollow, composite and nanosheet structure can effectively increase the diffusion efficiency and accessibility of acid sites, giving high catalytic activity. The accessibility of acid sites and diffusion efficiency can also be enhanced by introducing additional mesopores or macropores. By decreasing the crystal size to nanoscale, the diffusion length can be shortened. The catalytic activity increases and the amount of carbon deposition decreases with the decrease of crystal size. By regulating the acid properties of ZSM-5 with element or compound modification, the overreaction of reactants and formation of carbon deposition could be suppressed, thus enhancing the catalytic activity and light alkene selectivity. Besides, some future needs and perspectives of ZSM-5 with excellent cracking activity are addressed for researchers' consideration.

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“…For Com-BC, the steep increase of adsorbed amount at low relative pressure (P/P 0 < 0.1) indicates the presence of a certain amount of micropores in this catalyst [19]. The hysteresis loops demonstrate the existence of mesopore and macropore in both Com-BC and Cul-BC [20][21][22]. Combined with the pore size distribution (Fig.2B), it is obvious that the Com-BC catalyst possesses hierarchically porous structure with micropore, mesopore and macropore simultaneously.…”

Section: Catalyst Structure Propertiesmentioning

confidence: 91%

A facilitated synthesis of hierarchically porous Cu–Ce–Zr catalyst using bacterial cellulose for VOCs oxidation

Dou

Zhao

Yan

et al. 2019

Materials Chemistry and Physics

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Highly active CuO-CeO 2-ZrO 2 catalysts were prepared by sol-gel method, using environmentally friendly bacterial cellulose (BC) as structure directing regent. The catalyst designed with commercial BC (Com-BC) exhibited catalytic performances in toluene (T 100 =220 o C) and ethyl acetate oxidation (T 100 =170 o C) superior to the catalysts prepared by traditional methods. Furthermore, excellent stability was obtained and no deactivation was observed during the 100 h on stream in toluene and ethyl acetate oxidation at T 100. The excellent activity and stability of Com-BC can be explained by the hierarchically porous structure, abundant oxygen vacancies, and good reducibility.

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Exploring suitable ZSM-5/MCM-41 zeolites for catalytic cracking of n-dodecane: Effect of initial particle size and Si/Al ratio

Cited by 20 publications

References 36 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

Strategies to Enhance the Catalytic Performance of ZSM-5 Zeolite in Hydrocarbon Cracking: A Review

A facilitated synthesis of hierarchically porous Cu–Ce–Zr catalyst using bacterial cellulose for VOCs oxidation

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Exploring suitable ZSM-5/MCM-41 zeolites for catalytic cracking of n-dodecane: Effect of initial particle size and Si/Al ratio

Cited by 20 publications

References 36 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

Strategies to Enhance the Catalytic Performance of ZSM-5 Zeolite in Hydrocarbon Cracking: A Review

A facilitated synthesis of hierarchically porous Cu–Ce–Zr catalyst using bacterial cellulose for VOCs oxidation

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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