Direct synthesis of hierarchically structured MFI zeolite nanosheet assemblies with tailored activity in benzylation reaction

Liu, Baoyu; Chen, Zhipeng; Huang, Jiajin; Chen, Huiyong; Fang, Yanxiong

doi:10.1016/j.micromeso.2018.07.019

Cited by 24 publications

(19 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…H2SO4, HCl, HNO3) are most frequently used in the synthesis of benzylated arenes, 8 however, they cause sever environmental issues and problems with catalyst separation and regeneration. 9 Environmentally friendly heterogeneous catalysts have been developed to replace homogeneous acids, including zeolites and mesoporous silica-alumina, 7,[10][11][12][13][14][15][16][17][18][19][20][21][22] acidic oxides and sulphides, [23][24][25][26][27][28][29][30] and heteropoly acids (HPAs). 15,31 Zeolites, having crystalline framework, high surface area, regular porous structure, and strong acidity, are the most popular catalysts used in current chemical processes.…”

Section: ◼ Introductionmentioning

confidence: 99%

Catalytic arene alkylation over H-Beta zeolite: Influence of zeolite shape selectivity and reactant nucleophilicity

Zeng

Wang

Ding

et al. 2019

Journal of Catalysis

View full text Add to dashboard Cite

Renewable arenes and aromatic alcohols can be derived from lignocellulose by biorefineries, which has been considered as a sustainable alternative to replace petrochemical feedstocks in the synthesis of monobenzylation products, key industrial intermediates, via benzylation reactions. Zeolites with micropores are the most widely used catalysts in the benzylation of arenes, however, their performance suffers from diffusion limitations in converting large arenes. In this work, mesoporous and microporous H-Beta zeolites were prepared and applied in the systematic study of benzylation of arenes (benzene, toluene, p-xylene and mesitylene) with benzyl alcohol (BA). The porous structure of these zeolites has been confirmed by XRD, BET and TEM techniques. The catalytically active Brønsted acid sites (BAS) were determined by quantitative 1 H magic-angle spinning (MAS) nuclear magnetic resonance (NMR) experiments. The benzylation studies have shown that introducing mesopores into H-Beta zeolites can significantly increase the diffusion/access of arenes to surface sites, particularly for bulky arenes (e.g. mesitylene), while micropores are mainly selective for the conversion of small arenes (e.g. benzene).Increasing the nucleophilicity of arenes with more alkyl groups can enhance their catalytic performance in mesopores, however, the increase hinders their conversion in micropores because of the shape selectivity due to their increasing molecular size. Compared to mesopores, micropores promote the conversion of small arenes (e.g. benzene), which can be additionally enhanced by a high Brønsted acidity. Therefore, introducing a suitable porosity balanced with acidity is are keys in the tailoring of the catalytic performance of H zeolites for target benzylation reactions.

show abstract

Section: ◼ Introductionmentioning

confidence: 99%

Catalytic arene alkylation over H-Beta zeolite: Influence of zeolite shape selectivity and reactant nucleophilicity

Zeng

Wang

Ding

et al. 2019

Journal of Catalysis

View full text Add to dashboard Cite

show abstract

“…Zeolites are crystalline microporous aluminosilicates made from [AlO4] 3and [SiO4] 4-tetrahedral units, forming channels and cavities. Zeolites are widely used in catalysis, ion exchange, adsorption and separation processes due to their high porosity, tunable acidity/basicity and high ion-exchange capacity [1][2][3]. Recently, a number of works has been reported on the synthesis, characterization and applications of zeolites with crystallite size below 100 nm due to their superior properties such as reducing diffusion path length, large external surface area, high colloidal stability, etc.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Cs-ABW nanozeolite in organotemplate-free system

Ghrear¹,

Rigolet²,

Daou³

et al. 2019

Microporous and Mesoporous Materials

View full text Add to dashboard Cite

Cesium-aluminosilicate zeolite nanocrystals with ABW framework structure are synthesized free of organic template using hydrothermal approach. The crystallization process of Cs-ABW zeolite nanocrystals by varying the initial gel molar composition, heating temperature and crystallization time was studied. More detailed investigations of the formation of Cs-ABW nanozeolite using a reactive clear precursor hydrogel (4SiO2:1Al2O3:16Cs2O:160H2O) were then carried out. Fully crystalline Cs-ABW nanozeolites were obtained within 120 min at 180 C and 22 bar, which is considerably faster in comparison to the currently available method involving treatment at 695 C, 1000 bar and 46 h. The Cs-ABW nanocrystals have grain shape morphology with a mean size of 32 nm and they do not agglomerate for long durations. The nanosized Cs-ABW zeolite has high alumina content (Si/Al ratio = 1.04). These nanocrystals can be prepared in high solid yield (ca. 82%) thus offering a promising route for large-scale production of highly basic zeolite nanoparticles.

show abstract

“…[ 226 ] Higher Al content in the nanosheets changed the organization of the crystals in the aggregates from nanosheet stacks to HCL structures. [ 227 ] Another tetra‐headgroup rigid bolaform quaternary ammonium surfactant was used to create a multilamellar mesoporous ZSM‐5. The dual‐functional amphiphilic surfactants play a critical role for directing the structure with high mesoporosity.…”

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

Direct synthesis of hierarchically structured MFI zeolite nanosheet assemblies with tailored activity in benzylation reaction

Cited by 24 publications

References 42 publications

Catalytic arene alkylation over H-Beta zeolite: Influence of zeolite shape selectivity and reactant nucleophilicity

Catalytic arene alkylation over H-Beta zeolite: Influence of zeolite shape selectivity and reactant nucleophilicity

Synthesis of Cs-ABW nanozeolite in organotemplate-free system

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

Contact Info

Product

Resources

About