Seed-fused ZSM-5 nanosheet as a superior MTP catalyst: Synergy of micro/mesopore and inter/external acidity

Shang, Yunshan; Wu-Gang, WANG; Zhai, Yanliang; Song, Yu; Zhao, Xiaomeng; Ma, Tiancai; Wei, Jianhui; Gong, Yumei

doi:10.1016/j.micromeso.2018.09.038

Cited by 37 publications

(18 citation statements)

References 67 publications

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“…Superior catalysis for the methanol to propylene reaction was reported. [231] Epitaxial growth of layered nanosheets over bulky ZSM-5 zeolites, obtained by adding conventional ZSM-5 to a synthesis solution of lamellar ZSM-5, yielded a hierarchical core-shell ZSM-5 structure. [232] Self-pillared MFI nanosheets with Ni nanoclusters were synthesized by Gong et al In the one-pot hydrothermal synthesis with the bifunctional surfactant C 18-6-6 Br 2 , MFI nanosheets were affected by the content of Ni as Ni nanoclusters prevented the adjacent nanosheets of forming new SiOSi bonds.…”

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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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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“…Some parts of the ZSM-5 seed were dissolved to form nuclei and other parts acted as the core of epitaxial growth to facilitate nanosheet structures. The seed-fused ZSM-5 synthesis approach results in a short crystallization time, small particle size and the easy adjustment of surface acidities and textural properties [26]. Furthermore, siliceous nanosheets, which are representatives of the high silica zeolite, have also been developed.…”

Section: Synthesis Of Hierarchical Zeolite Nanosheetsmentioning

confidence: 99%

“…%, the CNS catalyst improved the catalytic lifetime from 168 to 226 h for methanol to propylene. The boron zeolite nanosheet, B-CNS-5, also exhibited a high catalytic lifetime (302 h) and methanol conversion, because of the lower acidity from B addition, which suppressed coke formation [26].…”

Section: Methanol and Ethanol To Light Olefinsmentioning

confidence: 99%

“…Due to this reason, in the n-heptane cracking, the hierarchical ZSM-5 zeolite nanocrystals exhibited high light olefins selectivity with a low coking amount. The mesopore provides short diffusion path lengths and lower diffusion limitation, which enhance light olefins yield and prevent the coke deposition [26]. Interestingly, the pillared HZSM-5 nanosheets were prepared by following two approaches: (i) using a dual template (denoted as DZN-2 catalyst); (ii) Si precursor intercalation in which TEOS penetrated into the surfactant region (denoted as PZN-2 catalyst).…”

Section: Catalytic Cracking and Dehydrogenation Of Alkanesmentioning

confidence: 99%

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A Comprehensive Review of the Applications of Hierarchical Zeolite Nanosheets and Nanoparticle Assemblies in Light Olefin Production

Dugkhuntod

Wattanakit

2020

Catalysts

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Light olefins including ethylene, propylene and butylene are important building blocks in petrochemical industries to produce various chemicals such as polyethylene, polypropylene, ethylene oxide and cumene. Traditionally, light olefins are produced via a steam cracking process operated at an extremely high temperature. The catalytic conversion, in which zeolites have been widely used, is an alternative pathway using a lower temperature. However, conventional zeolites, composed of a pure microporous structure, restrict the diffusion of large molecules into the framework, resulting in coke formation and further side reactions. To overcome these problems, hierarchical zeolites composed of additional mesoporous and/or macroporous structures have been widely researched over the past decade. In this review, the recent development of hierarchical zeolite nanosheets and nanoparticle assemblies together with opening up their applications in various light olefin productions such as catalytic cracking, ethanol dehydration to ethylene, methanol to olefins (MTO) and other reactions will be presented.Catalysts 2020, 10, 245 2 of 15 windows, they can be divided into three different categories including large porous, medium porous and small porous zeolites, which are composed of a different number of tetrahedral units, or T atoms of 12, 10 and 8 membered rings, respectively. These behaviors make each zeolite serving unique shape selective properties, which are very important for the appropriate applications.Although there are several above-mentioned promising properties of zeolites, they are typically composed of a very small microporous structure, eventually resulting in some disadvantages of the diffusion limitation of guest molecules inside the framework. Some bulky molecules cannot easily penetrate into active sites located at microporous channels, and therefore a poor catalytic performance due to a very low reaction rate and a fast deactivation of catalysts is observed. To overcome these limitations and to improve the accessibility of molecules into active sites, in recent years modified zeolites obtained by introducing additional larger porous structures have been extensively developed [5][6][7][8].It is well known that hierarchical zeolites, composed of at least two levels of porous structures such as microspores and mesopores, microspores and macropores, and micropores/mesopores and macropores have been extensively studied and developed. Their microporous (<2 nm), mesoporous (2-50 nm) and/or macroporous (>50 nm) structures are well connected to each other. In this case, the additional larger porous structures can improve diffusion limitation, molecular transportation and coke deposition [9]. In the past decade, there have been several studies regarding the synthesis of hierarchical zeolites to overcome these problems. Herein, this comprehensive review opens up perspectives of the recent synthesis approaches of hierarchical zeolite nanosheets and nanoparticle assemblies, as well as the successful production of light olef...

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“…These catalysts show ameliorated MTP catalytic efficiency as opposed to the zeolite that was not modified. The substantial improvement in the lifetime of the catalyst could be associated with decreased strong/weak acid site ratios and preventing diverse hydrogen-transfer reactions that produce aromatic moieties (Hu et al 2014;Yaripour et al 2015;Xu et al 2013aXu et al , 2013Yang et al 2012;Ahmed et al 2019;Zhai et al 2019;Ding et al 2019;Sadeghpour et al 2018;Wang et al 2017;Shang et al 2019;Yahyazadeh Saravi and Taghizadeh 2018;Zhu et al 2011;Chen et al 2016a;Li et al 2018b). Yaripour et al (2015) prepared high silica H-[B]-ZSM-5 (Si/Al and Si/B molar ratios = 200 and 10, respectively) by the conventional hydrothermal method.…”

Section: Introductionmentioning

confidence: 99%

Preparation of hierarchical H-[B]-ZSM-5 zeolites by a desilication method as a highly selective catalyst for conversion of methanol to propylene

Beheshti

Ahmadpour

Behzad

et al. 2020

Braz. J. Chem. Eng.

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A hydrothermal route was exploited to prepare high-silica H-ZSM-5 as well as H-[B]-ZSM-5 zeolites, and the boron-modified type was then desilicated with alkaline treatment. The properties of catalysts were investigated by different techniques, and the catalytic performance was evaluated in the methanol to propylene reaction. The effects of three critical desilication parameters, including the alkali concentration, temperature, and treatment time were evaluated on propylene selectivity and mesopore volume. The results of characterizations evinced that the incorporation of B in the H-ZSM-5 zeolite reduced the total surface area as well as the pore volume of the H-[B]-ZSM-5 sample and increased the external surface area. Furthermore, a significant increase in the weak acid site density for the boron-containing specimen was observed. Also, the external surface area and mesopore volume of the desilicated specimens underwent an increment, while the micropore volume was almost constant. As opposed to the H-[B]-ZSM-5 catalyst, the optimum desilicated catalyst exhibited higher selectivity to propylene (48.8 vs. 40.7%) and total light olefins (76.9 vs. 71.2%), and a higher ratio of propylene to ethylene (5.66 vs. 4.15). The optimum catalyst had a higher lifetime in the MTP reaction (867 h) as opposed to the microporous H-[B]-ZSM-5 catalyst (498 h).

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Seed-fused ZSM-5 nanosheet as a superior MTP catalyst: Synergy of micro/mesopore and inter/external acidity

Cited by 37 publications

References 67 publications

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

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

A Comprehensive Review of the Applications of Hierarchical Zeolite Nanosheets and Nanoparticle Assemblies in Light Olefin Production

Preparation of hierarchical H-[B]-ZSM-5 zeolites by a desilication method as a highly selective catalyst for conversion of methanol to propylene

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