Operando Study Reveals the Superior Cracking Activity and Stability of Hierarchical ZSM‐5 Catalyst for the Cracking of Low‐Density Polyethylene

Tarach, Karolina A.; Pyra, Kamila; Siles, Sandra; Melián‐Cabrera, Ignacio; Góra‐Marek, Kinga

doi:10.1002/cssc.201802190

Cited by 32 publications

(26 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Overall, Y-type zeolites have been found to have a positive effect on the selectivity and thermal stability of plastics degradation catalysts. [72,101,[117][118][119][120][121][122][123][124][125] They have been found to increase production of light hydrocarbons in the gaseous and liquid fractions, shifting the selectivity towards gasoline and diesel fuels with lower olefin content. [91,99,101,118,120,[123][124][125] Zeolite Y produced lower concentrations of viscous fractions as compared to thermal degradation because of enhanced cracking ability afforded by accessibility of acid sites.…”

Section: Zeolite Ymentioning

confidence: 99%

“…[123,209,210] Such catalysts have faster intracrystalline diffusion, lower steric hindrances for the conversion of bulky compounds, and higher resistance to coke deposition compared to typical microporous zeolites. [122] In addition, the mesoporous nature allows the deposition of highly dispersed metals or metal oxides to create of multifunctional catalysts with enhanced activity. [122,123,[210][211][212][213][214][215][216][217] Compared to the microporous zeolite, hierarchical zeolites have improved cracking activity, rendering higher yield of C 2 À C 5 hydrocarbons and delayed deactivation as a result of the secondary porosity.…”

Section: Hierarchical and Core-shell Catalystsmentioning

confidence: 99%

“…[122,123,[210][211][212][213][214][215][216][217] Compared to the microporous zeolite, hierarchical zeolites have improved cracking activity, rendering higher yield of C 2 À C 5 hydrocarbons and delayed deactivation as a result of the secondary porosity. [122] For example, hierarchical ZSM-23 were found to have higher conversion efficiency and lower operating temperature for UHMWPE degradation as compared to unmodified ZSM-23 due to secondary porosity and improved external surface area and acidity. [210] There exist numerous synthesis techniques to create hierarchical porous structures and each yield catalytically different materials due to accessibility to active sites and strength of acid sites.…”

Section: Hierarchical and Core-shell Catalystsmentioning

confidence: 99%

“…[210] There exist numerous synthesis techniques to create hierarchical porous structures and each yield catalytically different materials due to accessibility to active sites and strength of acid sites. [122,123,[210][211][212][213][214][215][216][217] For example, two different hierarchical βzeolite catalysts have been investigated for the cracking of HDPE in a recent study. [123] The two catalysts differed in the mesopore generation synthesis technique where one utilized cetyltrimethylammonium cations (CTAB + ) to reorganize zeolitic nanounits around the CTAB micelles while the other functionalized the nanounits with an organosilane.…”

Section: Hierarchical and Core-shell Catalystsmentioning

confidence: 99%

“…Zeolite Y can be modified in similar ways as ZSM‐5, in that it can be protonated (HY), but it can also be steam‐calcined to create an enhanced mesoporous, dealuminated ultrastable Y‐type zeolite that can be protonated (USY and HUSY). Overall, Y‐type zeolites have been found to have a positive effect on the selectivity and thermal stability of plastics degradation catalysts [72,101,117–125] . They have been found to increase production of light hydrocarbons in the gaseous and liquid fractions, shifting the selectivity towards gasoline and diesel fuels with lower olefin content [91,99,101,118,120,123–125] .…”

Section: Heterogeneous Catalystsmentioning

confidence: 99%

See 4 more Smart Citations

The Use of Heterogeneous Catalysis in the Chemical Valorization of Plastic Waste

2020

View full text Add to dashboard Cite

, respectively. Her graduate research focused on the fundamental understanding of deoxygenation mechanisms for biomass probe molecules on single crystals and thin films. During her graduate career, she received the DOE Science Graduate Student Research (SCGSR) award (2019) and conducted surface science research at Brookhaven National Lab. She now is a postdoctoral researcher at the University of Wisconsin-Madison. Her research focuses on surface spectroscopy and controlled design of heterogeneous catalysts. Melissa C. Cendejas received her B.A. (2016) in Chemistry and English from Williams College. There, she worked on the synthesis of conjugated organic molecules and phosphorusbased surfactants. She then started her PhD in Chemistry at the University of Wisconsin-Madison under the supervision of Prof. Ive Hermans. She studies active site formation on boron-based catalysts. She received the DOE Office of Science Graduate Student Research (SCGSR) award (2020) to perfrom in situ x-ray spectroscopy of catalysts at Stanford Synchrotron Radiation Lightsourse. Prof. Dr. Ive Hermans obtained his Ph.D. from KU Leuven University in Belgium in 2006. In addition to his scientific education, he also holds a postgraduate degree in Business Administration (KU Leuven, 2006). After postdoctoral research on in situ spectroscopy and reaction engineering with Prof. Alfons Baiker, he became assistant professor for heterogeneous catalysis (spring 2008) at ETH Zurich in Switzerland. January 2014, Prof. Hermans moved to the University of Wisconsin-Madison, holding a dual appointment in the Department of Chemistry and the Department of Chemical and Biological Engineering. His group focuses on the mechanistic understanding of catalytic technology using a variety of techniques.

show abstract

Section: Zeolite Ymentioning

confidence: 99%

Section: Hierarchical and Core-shell Catalystsmentioning

confidence: 99%

Section: Hierarchical and Core-shell Catalystsmentioning

confidence: 99%

Section: Hierarchical and Core-shell Catalystsmentioning

confidence: 99%

Section: Heterogeneous Catalystsmentioning

confidence: 99%

See 3 more Smart Citations

The Use of Heterogeneous Catalysis in the Chemical Valorization of Plastic Waste

2020

View full text Add to dashboard Cite

show abstract

Preparation of Novel Hierarchical Catalysts by Simultaneous Generation of β‐Zeolite and Mesoporous Silica for Catalytic Cracking

Oshimura,

Tanaka,

Nagata

et al. 2024

ChemPlusChem

View full text Add to dashboard Cite

The gel skeletal reinforcement (GSR) method was applied at the preparation stage of β‐zeolite to prepare a novel hierarchical catalyst. A solution of hexamethyldisiloxane (HMDS) and acetic anhydride, a GSR reagent, was added to the mixture of colloidal silica, sodium aluminate, tetraethylammonium hydroxide, sodium hydroxide and water, and successive aging and hydrothermal treatment gave microporous β‐zeolite surrounded by mesoporous silica like core‐shell structure. Its properties were characterized by XRD, nitrogen adsorption and desorption, NH3‐TPD, TEM, and TG‐DTA measurements, and further characteristics of the catalysts produced were clarified by the catalytic cracking of n‐dodecane. The hierarchical structure of microporous zeolite and mesoporous silica was shown from GSR‐2.9HS‐H‐Beta to GSR‐3.2HS‐H‐Beta, where the molar ratio of HMDS and silica source of β‐zeolite was 2.9~3.2:100. It was found that in the catalytic cracking of n‐dodecane, the relative activity (the conversion per the amount of zeolite crystals) increased with the increase in mesopore volume and surface area. The result indicated that the introduction of mesopores was effective even in catalytic cracking of small molecule of n‐dodecane.

show abstract

Conversion of HDPE into Value Products by Fast Pyrolysis Using FCC Spent Catalysts in a Fountain Confined Conical Spouted Bed Reactor

et al. 2021

View full text Add to dashboard Cite

Continuous catalytic cracking of polyethylene over a spent fluid catalytic cracking (FCC) catalyst was studied in a conical spouted bed reactor (CSBR) with fountain confiner and draft tube. The effect of temperature (475-600°C) and space-time (7-45 g cat min g HDPE À 1) on product distribution was analyzed. The CSBR allows operating with continuous plastic feed without defluidization problems and is especially suitable for catalytic pyrolysis with high catalyst efficiency. Thus, high catalyst activity was observed, with waxes yield being negligible above 550°C. The main product fraction obtained in the catalytic cracking was made up of C 5 À C 11 hydrocarbons, with olefins being the main components. However, its yield decreased as temperature and residence time were increased, which was due to reactions involving cracking, hydrogen transfer, cyclization, and aromatization, leading to light hydrocarbons, paraffins, and aromatics. The proposed strategy is of great environmental relevance, as plastics are recycled using an industrial waste (spent FCC catalyst).

show abstract

Operando Study Reveals the Superior Cracking Activity and Stability of Hierarchical ZSM‐5 Catalyst for the Cracking of Low‐Density Polyethylene

Cited by 32 publications

References 27 publications

The Use of Heterogeneous Catalysis in the Chemical Valorization of Plastic Waste

The Use of Heterogeneous Catalysis in the Chemical Valorization of Plastic Waste

Preparation of Novel Hierarchical Catalysts by Simultaneous Generation of β‐Zeolite and Mesoporous Silica for Catalytic Cracking

Conversion of HDPE into Value Products by Fast Pyrolysis Using FCC Spent Catalysts in a Fountain Confined Conical Spouted Bed Reactor

Contact Info

Product

Resources

About