Pore fabrication of nano-ZSM-5 zeolite by internal desilication and its influence on the methanol to hydrocarbon reaction

Qi, Ruiyue; Fu, Tingjun; Wan, Weili; Li, Zhong

doi:10.1016/j.fuproc.2016.05.046

Cited by 62 publications

(24 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nano‐ZSM‐5 samples with different pore structures were prepared through adjusting the NaOH treatment time or introducing TPAOH into the NaOH solution. The synthesis of parent ZSM‐5 (denoted as P‐Z5) was referred to a reported method . During the synthesis, tetraethyl orthosilicate (TEOS, Tianjin Kemiou Chemical Reagent Co., Ltd, ≥98.0 %) and TPAOH (High‐purity chemical of Zhenjiang Runjing Co., Ltd, 25.0 %) were firstly mixed and stirred at 80 °C for 24 h, then the H 2 O solution containing Al(NO 3 ) 3 (Tianjin Kemiou Chemical Reagent Co., Ltd, ≥99.0 %) and NaOH (Tianjin Kemiou Chemical Reagent Co., Ltd, ≥96.0 %) was added to this mixture.…”

Section: Methodsmentioning

confidence: 99%

“…The hollow ZSM‐5 crystals are expected to have excellent diffusion properties and catalytic performance because of the short diffusion path length and large external surface. In the previous work, we found that hollow structured nano‐ZSM‐5 can be achieved by prolonging the NaOH alkali‐treatment time, and it showed high catalytic performance in the MTH reaction . However, the application of mesoporous or even hollow nano‐ZSM‐5 on MTH reaction was still very few to the best of our knowledge, and the influences of these special pore structures on the catalytic performance are unclear.…”

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Fabrication of Hollow Mesoporous Nanosized ZSM‐5 Catalyst with Superior Methanol‐to‐Hydrocarbons Performance by Controllable Desilication

Wan

et al. 2017

ChemCatChem

Self Cite

View full text Add to dashboard Cite

Supporting informationand the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.org/10. 1002/cctc.201700925. This work aims to improve the catalystl ifetime of ZSM-5 for the methanol-to-hydrocarbons conversion by tuning the pore structurea nd external surface area on nano-ZSM-5 (100 nm). Severald ifferently pore-structured samples were synthesized based on the controllable desilicationo fn ano-ZSM-5 by prolongingt he alkali-treatment time and introducingt etrapropylammonium hydroxide (TPAOH) into NaOH solution. 2h NaOH treatment produced mesoporous ZSM-5 with well-maintained interior,a nd the catalytic lifetime was prolonged from 60 to 127 ha longw ith increased isoparaffins selectivity owing to improvedd iffusion and accessibility of internal weak acid sites. If prolonging the treating time to 15 h, nano-ZSM-5 with initially formed hollow structure (HI-Z5) was achieved, which shows relativelys hort lifetimeo f8 5h and high aromaticss electivity. After as econdary treatment of HI-Z5w ith fresh NaOH solution for 5h,the formed thin shell and clean interior significantly improvedd iffusion, and the lifetime increased from 85 to 115h. The aromatics selectivity was also increased by the enhanced acidity.Mesopores were introduced into the shell of HI-Z5 after treatingi tw ith af reshly mixed solutiono fN aOH andT PAOH. The external surfacearea exhibited a9 4% increase, resulting in ah igh isoparaffins selectivity and al ong lifetimeof149 h.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Fabrication of Hollow Mesoporous Nanosized ZSM‐5 Catalyst with Superior Methanol‐to‐Hydrocarbons Performance by Controllable Desilication

Wan

et al. 2017

ChemCatChem

Self Cite

View full text Add to dashboard Cite

show abstract

“…This can be created for example by controlling the nucleation‐growth rate and engineering growth‐defects, [ 247 ] by additional desilication of nanozeolites, creating mesopores or hollow zeolites. [ 248 ] In a last study, mesoporous nano‐ZSM‐5 crystals were produced by using a desilication–recrystallization process. Here, silicalite‐1 was added to a TPAOH solution in the presence of NaAlO 2 .…”

Section: Synthesis Of Hierarchical 10‐mr Zeolitesmentioning

confidence: 99%

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

et al. 2020

View full text Add to dashboard Cite

Zeolites are highly crystalline aluminosilicates with welldefined pores that are constructed of SiO 2 and AlO 4 tetrahedra. These tetrahedra can be linked together in different unique ways to form various materials with a specific topology. [1] According to the International Zeolite Association (IZA), more than 250 different topologies, which are all assigned with a three-letter code, have been identified. [2] The micropores in zeolites are typically constructed from 8, 10, or 12 tetrahedral atoms

show abstract

“…It is believed that the coke formation cause by the sole micropores, which seriously restricts the diffusion of coke precursors lead to the coverage of the active sites and the deactivation of the catalyst. On another hand, the density and distribution of acid sites was also found to be related to the coke deposition [17][18][19]. 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.…”

mentioning

confidence: 99%

“…A desilication process with alkali is commonly used for the synthesis of hierarchical ZSM-5, which can also adjust the acidity properties [22]. As the density and distribution of acid sites was also found to be related to the coke deposition [17][18][19], adjusting them was believed to be beneficial to reduce coking. It is demonstrated that nano-zeolites with grain sizes that are less than 100 nm can also solve the diffusion problems besides the hierarchical porous structure.…”

mentioning

confidence: 99%

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

2019

View full text Add to dashboard Cite

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.

show abstract

Pore fabrication of nano-ZSM-5 zeolite by internal desilication and its influence on the methanol to hydrocarbon reaction

Cited by 62 publications

References 46 publications

Fabrication of Hollow Mesoporous Nanosized ZSM‐5 Catalyst with Superior Methanol‐to‐Hydrocarbons Performance by Controllable Desilication

Fabrication of Hollow Mesoporous Nanosized ZSM‐5 Catalyst with Superior Methanol‐to‐Hydrocarbons Performance by Controllable Desilication

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

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

Contact Info

Product

Resources

About