Enhancing aromatics and olefins yields in thermo-catalytic pyrolysis of LDPE over zeolites: Role of staged catalysis and acid site density of HZSM-5

Inayat, Amer; Inayat, Alexandra; Schwieger, Wilhelm; Sokolová, Barbora; Leštinský, Pavel

doi:10.1016/j.fuel.2021.123071

Cited by 36 publications

(20 citation statements)

References 27 publications

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“…Under equivalent tests, the catalyst with lower acid density formed C2-C4 olefins as the dominant products. These insights confirmed that reaction routes can be optimized by adjusting the zeolite acidity (Figure 2) [86]. Another attempt was performed by Choi and coworkers [87], who explored the catalytic decomposition of pine sawdust with polyethylene and polyethylene terephthalate in the presence of an HZSM-5 zeolite.…”

Section: Acid-catalyzed Cracking Of Polyolefins Without Hydrogenmentioning

confidence: 64%

“…Under equivalent tests, the catalyst with lower acid density formed C 2 -C 4 olefins as the dominant products. These insights confirmed that reaction routes can be optimized by adjusting the zeolite acidity (Figure 2) [86]. In addition, Inayat et al explored ZSM-5 zeolites with different acid densities for the thermocatalytic pyrolysis of low-density polyethylene.…”

Section: Acid-catalyzed Cracking Of Polyolefins Without Hydrogenmentioning

confidence: 76%

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Sustainably Recycling and Upcycling of Single-Use Plastic Wastes through Heterogeneous Catalysis

Zhang

Tang

et al. 2022

Catalysts

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The huge amount of plastic waste has caused a series of environmental and economic problems. Depolymerization of these wastes and their conversion into desired chemicals have been regarded as a promising route for dealing with these issues, which strongly relies on catalysis for C-C and C-O bond cleavage and selective transformation. Here, we reviewed recent developments in catalysis systems for dealing with single-use plastics, such as polyethylene, polypropylene, and polyethylene glycol terephthalate. The recycling processes of depolymerization into original monomers and conversion into other economic-incentive chemicals were systemically discussed. Rational designs of catalysts for efficient conversion were particularly highlighted. Overall, improving the tolerance of catalysts to impurities in practical plastics, reducing the economic cost during the catalytic depolymerization process, and trying to obtain gaseous hydrogen from plastic wastes are suggested as the developing trends in this field.

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Section: Acid-catalyzed Cracking Of Polyolefins Without Hydrogenmentioning

confidence: 64%

“…Under equivalent tests, the catalyst with lower acid density formed C 2 -C 4 olefins as the dominant products. These insights confirmed that reaction routes can be optimized by adjusting the zeolite acidity (Figure 2) [86]. In addition, Inayat et al explored ZSM-5 zeolites with different acid densities for the thermocatalytic pyrolysis of low-density polyethylene.…”

Section: Acid-catalyzed Cracking Of Polyolefins Without Hydrogenmentioning

confidence: 76%

Sustainably Recycling and Upcycling of Single-Use Plastic Wastes through Heterogeneous Catalysis

Zhang

Tang

et al. 2022

Catalysts

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“…In spite of being an old topic, the carbenium/carbonium chemistry of cracking is still very relevant for understanding and explaining current research topics like the production of sustainable aviation fuels from biosourced oils or the recycling of plastics. − …”

Section: Monofunctional Transformation Of Alkanesmentioning

confidence: 99%

Molecular Views on Mechanisms of Brønsted Acid-Catalyzed Reactions in Zeolites

et al. 2023

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The Brønsted acidity of proton-exchanged zeolites has historically led to the most impactful applications of these materials in heterogeneous catalysis, mainly in the fields of transformations of hydrocarbons and oxygenates. Unravelling the mechanisms at the atomic scale of these transformations has been the object of tremendous efforts in the last decades. Such investigations have extended our fundamental knowledge about the respective roles of acidity and confinement in the catalytic properties of proton exchanged zeolites. The emerging concepts are of general relevance at the crossroad of heterogeneous catalysis and molecular chemistry. In the present review, emphasis is given to molecular views on the mechanism of generic transformations catalyzed by Brønsted acid sites of zeolites, combining the information gained from advanced kinetic analysis, in situ, and operando spectroscopies, and quantum chemistry calculations. After reviewing the current knowledge on the nature of the Brønsted acid sites themselves, and the key parameters in catalysis by zeolites, a focus is made on reactions undergone by alkenes, alkanes, aromatic molecules, alcohols, and polyhydroxy molecules. Elementary events of C–C, C–H, and C–O bond breaking and formation are at the core of these reactions. Outlooks are given to take up the future challenges in the field, aiming at getting ever more accurate views on these mechanisms, and as the ultimate goal, to provide rational tools for the design of improved zeolite-based Brønsted acid catalysts.

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“…The big advantage of chemical recycling (via pyrolysis) over incineration lies in the reduction of fossil CO 2 emissions, especially if renewable energy is used for the process, and production of pyrolysis oil which can partially substitute crude oil and consequently contribute to decreasing the primary (non-renewable) resource consumption. In this regard, catalytic pyrolysis is an attractive process for the chemical transformation of waste plastics into useful chemicals [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Chemical Recycling of Waste Polypropylene via Thermocatalytic Pyrolysis over HZSM‐5 Catalysts

Inayat

Schwieger

et al. 2023

Chem Eng & Technol

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The present work deals with the chemical recycling of waste polypropylene via thermocatalytic pyrolysis over HZSM‐5 zeolite catalysts. The main aim was to systematically investigate the influence of reactor configuration, zeolite acidity, polypropylene wastes, obtained from different sources, as well as catalyst regeneration on the product distribution. It was demonstrated that the reactor configuration and the acid site density of HZSM‐5 catalysts strongly influence the product yields and distributions. The different types of polypropylene waste, on the other hand, showed a comparatively small yet noticeable effect on the product distribution. Moreover, it was demonstrated that the HZSM‐5 catalysts exhibit good regeneration capacity during regeneration‐reaction cycles.

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Enhancing aromatics and olefins yields in thermo-catalytic pyrolysis of LDPE over zeolites: Role of staged catalysis and acid site density of HZSM-5

Cited by 36 publications

References 27 publications

Sustainably Recycling and Upcycling of Single-Use Plastic Wastes through Heterogeneous Catalysis

Sustainably Recycling and Upcycling of Single-Use Plastic Wastes through Heterogeneous Catalysis

Molecular Views on Mechanisms of Brønsted Acid-Catalyzed Reactions in Zeolites

Chemical Recycling of Waste Polypropylene via Thermocatalytic Pyrolysis over HZSM‐5 Catalysts

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