Sustainable production of ethylene from bioethanol over hierarchical ZSM-5 nanosheets

Shetsiri, Sirawit; Thivasasith, Anawat; Saenluang, Kachaporn; Wannapakdee, Wannaruedee; Salakhum, Saros; Wetchasat, Piraya; Nokbin, Somkiat; Limtrakul, Jumras; Wattanakit, Chularat

doi:10.1039/c8se00392k

Cited by 59 publications

(69 citation statements)

References 89 publications

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“…At mild temperatures of 300-350 • C, the hierarchical ZSM-5 nanosheets exhibit high ethanol conversion around 90%, high ethylene selectivity around 85% and high stability. From the computational results, the ethylene might occur using the Brønsted acid sites at the external surfaces of MFI, whereas diethyl ether is the major reaction using the internal Brønsted acid sites [63].…”

Section: Methanol and Ethanol To Light Olefinsmentioning

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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Section: Methanol and Ethanol To Light Olefinsmentioning

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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“…The XRD patterns of ZSM-5@AMO-LDHs(y) composites as shown in Figure 1 A exhibit both characteristic peaks of LDH and MFI structures. [37,55] The main characteristic peaks of MFI appear at 2Θ of 7.9°, 8.8°, 23.1°, 23.9°and 29.8°, which corresponding to (101), (111), (501), (303) and (503) planes, respectively [56,57] and the main characteristic peaks of LDH appear at 2Θ of 11.4, 34.7, 39.0 and 46.4°, corresponding to the reflection planes of (003), (009), (015) and (018), respectively. [37] Moreover, more intense LDH characteristic peaks can be observed at 2Θ of 11.4, 34.7, 39.0 and 46.4°with increasing of LDH content.…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

Modified Acid‐Base ZSM‐5 Derived from Core‐Shell ZSM‐5@ Aqueous Miscible Organic‐Layered Double Hydroxides for Catalytic Cracking of n‐Pentane to Light Olefins

et al. 2020

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Over the past decades, the catalytic cracking catalysts for hydrocarbon oil upgrading have been extensively developed to increase the yield of light olefins. In this context, we report the fabrication of the core‐shell ZSM‐5@aqueous miscible organic‐layered double hydroxides prepared by the growth of layered double hydroxides (LDH) precursors on zeolite surfaces. The deposited LDH results in a decrease of the number of strong Brønsted acid sites on zeolite surfaces and its transformation at high temperature leads to produce the highly dispersed metal oxides deposited on external surfaces of zeolites. Therefore, the acid‐base properties of designed surfaces are modified, eventually resulting in the suppression of competing hydride transfers and further side reactions. As a result, there is a significant enhancement in light olefins production compared with the pristine zeolite. In addition, the designed catalysts exhibit high recycling stability and reusability. This first example opens up the new perspectives for the development of modified acid‐base zeolites using zeolite@aqueous miscible organic‐layered double hydroxides for the catalytic upgrading of hydrocarbons.

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“…One solution to improve the performance of the porous materials is to use nano-sized particles and introduce additional mesoporosity within or between zeolite crystals to reduce the diffusion path and enhance adsorption capacities. [26][27][28][29][30][31] In particular, the creation of secondary mesoporosity is interesting as it minimizes negative effects, such as pore blockage and coke formation in catalysis. In these hierarchical nano-sized zeolites, the presence of short microporous channels and large external surface area are two key factors that can improve the activity and selectivity of these materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of zeolite morphology on charge separated states: ZSM-5-type nanocrystals, nanosheets and nanosponges

Duplouy

Moissette

Hureau

et al. 2020

Phys. Chem. Chem. Phys.

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Sustainable production of ethylene from bioethanol over hierarchical ZSM-5 nanosheets

Abstract: Highly selective production of ethylene from bioethanol dehydration over hierarchical ZSM-5 nanosheets.

Cited by 59 publications

References 89 publications

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

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

Modified Acid‐Base ZSM‐5 Derived from Core‐Shell ZSM‐5@ Aqueous Miscible Organic‐Layered Double Hydroxides for Catalytic Cracking of n‐Pentane to Light Olefins

Effect of zeolite morphology on charge separated states: ZSM-5-type nanocrystals, nanosheets and nanosponges

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