Cooperative structure direction of organosilanes and tetrapropylammonium hydroxide to generate hierarchical ZSM-5 zeolite with controlled porous structure

Shen, Yu; Han, Zongzhuang; Li, Hang; Li, Haichao; Wang, Gang; Wang, Fumin; Zhang, Xubin

doi:10.1039/c8ce01152d

Cited by 7 publications

(6 citation statements)

References 49 publications

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“…The EDS analysis shown in Figure S14 also confirms the successful incorporation of Fe and Ga species. Meanwhile, the UV–vis spectrum and B MAS NMR results shown in Figure S15 and Figure S16 also confirm the existence of framework Fe, Ga, and B species and the successful synthesis of high-amount Fe-, Ga-, and B-doped hollow silicate-1. , …”

Section: Results and Discussionmentioning

confidence: 66%

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Racing Crystallization Mechanism for Economical Design of Single-Crystal Hollow ZSM-5 with the Broken Limit of Si/Al Ratio and Improved Mass Transfer

Zhai

Zhang

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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Development of economic strategy to synthesize hollow zeolite with widely tunable Si/Al ratios providing variable acidity is of great significance in industry. Here, a one-step and low-cost strategy without mesoporogen was successfully developed to synthesize single-crystal hollow ZSM-5 containing mesopores/ macropores, with variable Si/Al ratios of about 14−∞ and 114−∞ at critical TPA + /SiO 2 ratios of 0.05−0.1 and 0.05, respectively. This is the first time the usage of a large amount of TPAOH was avoided while breaking the traditional limitation of Si/Al ratio (25−50). The component of synthesis system and crystallization temperature acting as the vital roles in hollow structure has been confirmed by a series of characterization. Moreover, according to the investigation of the evolution process, a novel racing crystallization mechanism based on the competition relationship between surface crystallization and the internal dissolution rate was proposed for the first time. The racing crystallization mechanism and internal nonprotective aluminum become the crucial factors for synthesis. The prepared hollow ZSM-5 zeolites exhibit superior catalytic performance in the different acidity-catalyzed condensation involving large molecules between benzaldehyde and n-butyl alcohol as well as 2-hydroxyacetophenone, which is mainly attributed to the property acidity, more accessible active Al sites on the surface, and shorter diffusion path. By calculating, the effectiveness factor (η) of hollow zeolite is close to 1, further confirming its better mass transfer ability. The strategy has also been successfully extended to the synthesis of high-amount Fe-doped, Ga-doped, and B-doped hollow silicate-1.

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Section: Results and Discussionmentioning

confidence: 66%

“…Meanwhile, the UV−vis spectrum and B MAS NMR results shown in Figure S15 and Figure S16 also confirm the existence of framework Fe, Ga, and B species and the successful synthesis of high-amount Fe-, Ga-, and B-doped hollow silicate-1. 54,55 3.8. Catalytic Test for the Aldol Condensation.…”

Section: Resultsmentioning

confidence: 99%

Racing Crystallization Mechanism for Economical Design of Single-Crystal Hollow ZSM-5 with the Broken Limit of Si/Al Ratio and Improved Mass Transfer

Zhai

Zhang

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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“…Obviously, all the samples exhibited a sharp increase in nitrogen uptakes in a relatively low pressure of P/P 0 < 0.01, which indicated the presence of a microporous structure. 32 The samples prepared in the presence of TPOAC showed an enhanced uptake in the region of P/P 0 > 0.4, 33 corresponding to typical characteristics of mesopore materials. Moreover, the Barrett−Joyner−Halenda (BJH) method was adopted to investigate pore size distributions of the prepared beta zeolites, as shown in Figure S1.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

Synthesis of Linear Alkylbenzenes over Beta Zeolites with Enhanced Transport and Surface Activity

Zhang

et al. 2021

Ind. Eng. Chem. Res.

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The development of zeolite catalysts for linear alkylbenzene production is of crucial importance in achieving green chemical processes for the detergent industry. In the present research, the fabricated beta zeolite catalysts exhibited extraordinary activity (73%) and selectivity of 2-LAB (85%) in the alkylation of benzene with 1-dodecene, which benefited from the open micropore-to-mesopore networks, exposed acid sites, and shape-selectivity of special topology of beta zeolites. The computer calculations revealed that both benzene and 1-dodecene can enter into the 12-MR channels of beta zeolites, in which 1-dodecene was adsorbed on the surface of 12-MR channels in the form of chemical adsorption, and the fixed 1-dodecene was attached to benzene combined with the matched pore size of 12-MR channels of beta zeolites to effectively produce the desired 2-LAB. Moreover, the mesopore beta zeolites also presented superior stability compared with traditional micropore beta zeolite in the alkylation between benzene and 1-dodecene due to enhanced diffusion. Our work definitely paved a way to develop mesopore beta zeolites as a new type of highly efficient heterogeneous catalysts for industrial production of 2-LAB.

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“…[106] The same TPOAC, but now in combination with TPAOH, was studied by Shen et al, who showed different morphologies by adjusting the composition of the synthesis mixture, in this way catalysts with nanorod morphologies and wormlike intracrystalline mesopores were created. [107] In another study, Xing et al used an acid treated kaolin clay as an Al and Si source in combination with organosilanes. Hexadecyltrimethoxysilane was added as a mesoporogen in a SAC method.…”

Section: Zsm-5mentioning

confidence: 99%

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

et al. 2020

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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

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Cooperative structure direction of organosilanes and tetrapropylammonium hydroxide to generate hierarchical ZSM-5 zeolite with controlled porous structure

Abstract: Hierarchical ZSM-5 zeolites of controlled porous structure were realized by the cooperative direction of organosilanes and tetrapropylammonium hydroxide.

Cited by 7 publications

References 49 publications

Racing Crystallization Mechanism for Economical Design of Single-Crystal Hollow ZSM-5 with the Broken Limit of Si/Al Ratio and Improved Mass Transfer

Racing Crystallization Mechanism for Economical Design of Single-Crystal Hollow ZSM-5 with the Broken Limit of Si/Al Ratio and Improved Mass Transfer

Synthesis of Linear Alkylbenzenes over Beta Zeolites with Enhanced Transport and Surface Activity

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

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