Controllable fabrication and catalytic performance of nanosheet HZSM‐5 films by vertical secondary growth

Tian, Yajie; Liu, Hong; Wang, Li; Zhang, Xiangwen; Liu, Guozhu

doi:10.1002/aic.16158

Cited by 32 publications

(14 citation statements)

References 24 publications

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“…The specific value of L / B decreases in the order of Z‐130 > Z‐200 > Z‐300 > Z‐60 > Z‐18, and the total Brønsted acid sites reduce with the decrease of Al content. Since the diameter of DTBPy (1.05 nm) is much larger than the size of micropores in HZSM‐5 (0.53 × 0.56 nm), it can be used to study the B acid sites on the external surface . As exhibited in Figure b, the peak at around 1,610 cm −1 is attributed to DTBPy bonded to surface B acid sites.…”

Section: Resultsmentioning

confidence: 99%

Zeolite catalytic synthesis of high‐performance jet‐fuel‐range spiro‐fuel by one‐pot Mannich–Diels–Alder reaction

et al. 2019

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A one-pot Mannich-Diels-Alder reaction was developed for synthesis of highperformance jet-fuel-range spirocycloalkane with an overall yield of 71.6% from biomass and petroleum derived cyclopentanone, formaldehyde, and cyclopentadiene. HZSM-5 zeolite with Si/Al molar ratio of 130 exhibits much higher catalytic activity, along with good recycling ability. Over it, a high selectivity (81.6%) and yield (80.9%) of target adduct is achieved with almost complete conversion of cyclopentanone, attributed to the synergy effect of appropriate ratio of Lewis to Brønsted acid sites and mass transfer effect of porous zeolite. More importantly, after hydrodeoxygenation, the resultant spirocycloalkane has much higher density and volumetric neat heat of combustion (0.952 gÁml −1 , 40.18 MJ L −1) than the wildly used JP-10 fuel (0.936 g ml −1 , 39.41 MJ L −1). This work provides a promising route to produce high-performance jet-fuel-range hydrocarbons through co-conversion of biomass and petroleum derivatives.

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Section: Resultsmentioning

confidence: 99%

Zeolite catalytic synthesis of high‐performance jet‐fuel‐range spiro‐fuel by one‐pot Mannich–Diels–Alder reaction

et al. 2019

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“…It was found that the morphology of MFI nanosheets can be changed from a disordered assembly to an ordered multilamellar structure when increasing the hydrothermal aging time [12]. To control nanosheet structures, there are several types of surfactants, in particular, quaternary ammonium surfactants, as well as other templates or seeds that have been developed to synthesize various hierarchical zeolite nanosheets with different morphologies [13][14][15]. For example, tetrapropylammonium hydroxide (TPAOH) was used together with C 22−6−6 as a dual-template to control hierarchical structures [13].…”

Section: Synthesis Of Hierarchical Zeolite Nanosheetsmentioning

confidence: 99%

“…When increasing the amount of TPAOH, the morphology of the MFI nanosheet changes from intertwined particles to house-of-cards-structures. In addition, nanosheet HZSM-5 films deposited on the support and the hierarchical MFI nanosponge were successfully synthesized using C 22-6-6 in seed-assisted synthesis methods [14,15]. Their hierarchical structures exhibit the remarkably improved activity attributing to the enhanced accessibility and diffusion of bulky molecules into the zeolite framework.…”

Section: Synthesis Of Hierarchical Zeolite Nanosheetsmentioning

confidence: 99%

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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“…It exhibited a high catalytic stability on n-hexane cracking since it was less sensitive to the deactivation by coke [14]. The MFI zeolite with ultrathin nanosheet morphology showed a higher BET surface area and pore volume, which facilitated the transport of reactants, resulting in higher activity comparing with the conventional ZSM-5 zeolite [15][16][17]. The ZSM-5 zeolite with a hollow fiber morphology facilitated the cracking of n-butane and the generation of light alkenes due to the hierarchical porosity [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ethanol on the Morphology and Textual Properties of ZSM-5 Zeolite

Liu

Sun

2020

Catalysts

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The morphology of ZSM-5 zeolite impacts the adsorption, separation and diffusion of molecules. The morphology and textural properties of ZSM-5 zeolites were adjusted by regulating the content of ethanol in the synthesis gel. When the ratio of ethanol/SiO2 was lower than 2, the obtained crystals were isolated particles. With higher ethanol concentration, the chainlike zeolite was generated due to the condensation of terminal Si-OH groups. The crystals stacked more and more compactly with the increase in ethanol concentration, resulting in decreased specific surface area, total volume and mesoporous volume. The crystal size increased gradually with the increase in the ethanol concentration. Moreover, some other small molecular alcohols could also induce the formation of chainlike morphology of ZSM-5.

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Controllable fabrication and catalytic performance of nanosheet HZSM‐5 films by vertical secondary growth

Cited by 32 publications

References 24 publications

Zeolite catalytic synthesis of high‐performance jet‐fuel‐range spiro‐fuel by one‐pot Mannich–Diels–Alder reaction

Zeolite catalytic synthesis of high‐performance jet‐fuel‐range spiro‐fuel by one‐pot Mannich–Diels–Alder reaction

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

Effect of Ethanol on the Morphology and Textual Properties of ZSM-5 Zeolite

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