Facile synthesis of hierarchical nanocrystalline ZSM-5 zeolite under mild conditions and its catalytic performance

Ni, Youming; Sun, Aihua; Wu, Xiaoling; Hai, Guoliang; Hu, Jianglin; Li, Tao; Li, Guangxing

doi:10.1016/j.jcis.2011.06.020

Cited by 39 publications

(9 citation statements)

References 45 publications

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“…Therei sasignificant contribution of mesoporest ot he total pore volumeo f the nanosized materials, which has already been reported in the literature. [28] This phenomenon is more pronouncedi nt he samples prepared at low temperatures where the crystallites are smaller.B JH analysis reveals that the size of mesopores for all studied nanosized samples is in the range 20-50 nm. These relativelyl arge pores are due to intraparticle porosity.…”

Section: Resultsmentioning

confidence: 95%

“…The sample ZSM‐5(120 °C) also exhibits a rough surface, but the size of individual crystals is larger than in the 100 °C sample. There is a significant contribution of mesopores to the total pore volume of the nanosized materials, which has already been reported in the literature . This phenomenon is more pronounced in the samples prepared at low temperatures where the crystallites are smaller.…”

Section: Resultsmentioning

confidence: 99%

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Tuning Zeolite Properties for a Highly Efficient Synthesis of Propylene from Methanol

Palčić

Ordomsky

Qin

et al. 2018

Chemistry A European J

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A series of nanosized ZSM-5 samples was synthesized at 170, 150, 120, and 100 °C. Experimental data show that the decrease of crystallization temperature leads to significant changes in zeolite properties. Crystals synthesized at 100 °C exhibit many framework defects with lower acid-site density, strength, and a larger external surface area. The selectivity to light olefins and the propylene-to-ethylene ratio increases as the crystallization temperature decreases. A propylene-to-ethylene ratio of above 6 with the highest selectivity to propylene of 53 % was obtained over ZSM-5 catalyst prepared at 100 °C. The stability of the nanosized zeolite in methanol to olefins (MTO) was also improved compared to the industrial sample with a similar Si/Al ratio. This catalytic performance is a result of the decrease in the acid-site density, strength, and the crystals' size, providing a shorter diffusion path and larger external surface area. The presence of structural defects and a different external surface in the crystals has been shown to play an important role in the MTO catalyst performance.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Tuning Zeolite Properties for a Highly Efficient Synthesis of Propylene from Methanol

Palčić

Ordomsky

Qin

et al. 2018

Chemistry A European J

View full text Add to dashboard Cite

show abstract

“…The methanol conversion capacity, defined as the cumulative amount of methanol conversted before the conversion of methanol drops, was used as an indicator for discriminating the stability of the catalyst [39]. The methanol conversion capacity of the intergrowth HZSM-5 plates was more than 240 gmethanol/gcat, which is close to the performance of the hierarchical nano-sized HZSM-5 (200-300 gmethanol/gcat) under simialr reaction conditions [40][41][42][43]. As compared with a conventional micro-sized coffin-like HZSM-5 with a similar SiO2/Al2O3 ratio (38), the methanol conversion capacity of the intergrowth HZSM-5 plates was 2.5 times greater than that the micro-sized HZSM-5 (Fig.…”

Section: Resultsmentioning

confidence: 88%

Perpendicular intergrowth ZSM-5 plates with shortened 10-MR pores

Zhan

Xiong

Zhou

et al. 2020

Chinese Journal of Catalysis

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“…6LaZ has a higher mesoporous volume and more medium acid sites. The mesoporous structure is helpful for the diffusion of bulkier molecules in the pore and protects against forming coke on catalysts . The appropriate porous and acidic properties are responsible for less coke formation and the higher catalytic activity of 6LaZ.…”

Section: Resultsmentioning

confidence: 99%

Production of Light Olefins from Catalytic Cracking Bio-oil Model Compounds over La₂O₃-Modified ZSM-5 Zeolite

Ding

Wang

et al. 2018

Energy Fuels

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Diminishing fossil fuel reserves and the increasing consumption of light olefins are driving intensive research to find a new non-petrochemical substitute resource to produce light olefins. Biomass-derived bio-oil is a promising substitute resource because it is renewable, abundant, and carbon-neutral. In this study, three bio-oil models, oleic acid (OA), methyl laurate (ML), and waste cooking oil (WCO), were catalytically cracked over La 2 O 3 -modified ZSM-5 (LaZ) aiming for production of light olefins. The content of La 2 O 3 in catalysts was adjusted to optimize the structure and properties of catalysts. The maximal light olefin yield was 131 mL/g for OA, 120 mL/g for ML, and 128 mL/g for WCO, which was obtained over the LaZ catalyst containing 6% La 2 O 3 (6LaZ). The maximal light olefin selectivity was 36.1% for OA, 30.3% for ML, and 33.8% for WCO. The obtained light olefins mainly contained propylene (13.6−17.1%), ethylene (10.7−15.4%), and butene (5.3−6.3%). Aromatic hydrocarbons and graphite were the main components in the liquid product and solid product (coke), respectively. 6LaZ exhibited better catalytic activity and anticoking ability than La-free ZSM-5, which was attributed to its appropriate porosity and acidity. The unsaturated molecular structure of feedstock was found, helping to improve the light olefin yield. Our investigations are useful for developing a new process route to produce light olefins from renewable biomass resources.

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Facile synthesis of hierarchical nanocrystalline ZSM-5 zeolite under mild conditions and its catalytic performance

Cited by 39 publications

References 45 publications

Tuning Zeolite Properties for a Highly Efficient Synthesis of Propylene from Methanol

Tuning Zeolite Properties for a Highly Efficient Synthesis of Propylene from Methanol

Perpendicular intergrowth ZSM-5 plates with shortened 10-MR pores

Production of Light Olefins from Catalytic Cracking Bio-oil Model Compounds over La₂O₃-Modified ZSM-5 Zeolite

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Facile synthesis of hierarchical nanocrystalline ZSM-5 zeolite under mild conditions and its catalytic performance

Cited by 39 publications

References 45 publications

Tuning Zeolite Properties for a Highly Efficient Synthesis of Propylene from Methanol

Tuning Zeolite Properties for a Highly Efficient Synthesis of Propylene from Methanol

Perpendicular intergrowth ZSM-5 plates with shortened 10-MR pores

Production of Light Olefins from Catalytic Cracking Bio-oil Model Compounds over La2O3-Modified ZSM-5 Zeolite

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Product

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Production of Light Olefins from Catalytic Cracking Bio-oil Model Compounds over La₂O₃-Modified ZSM-5 Zeolite