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2 edition of Catalytic degradation of polymers over zeolites found in the catalog.

Catalytic degradation of polymers over zeolites

R. S. Holsenburger

Catalytic degradation of polymers over zeolites

by R. S. Holsenburger

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  • 18 Currently reading

Published by UMIST in Manchester .
Written in English


Edition Notes

StatementR. S. Holsenburger ; supervised by A. Garforth.
ContributionsGarforth, A., Chemistry.
ID Numbers
Open LibraryOL17260513M

A synthetic mixture of real waste packaging plastics representative of the residue from a material recovery facility (plasmix) was submitted to thermal and catalytic pyrolysis. Preliminary thermogravimetry experiments coupled with Fourier transform infrared spectroscopy were performed to evaluate the effects of the catalysts on the polymers’ degradation temperatures . This work reports the synthesis of natural zeolite-based silver and magnetite nanocomposites and their application for the catalytic oxidation of methylene blue in water. The zeolite was impregnated with wt.% Fe in the form of magnetite nanoparticles with size of 32 nm, and with wt.% Ag in the form of silver oxide and metallic silver nanoparticles with sizes of 42 and 20 .

Thermal-catalytic degradation kinetics of polypropylene over BEA, ZSM-5 and MOR zeolites. Applied Catalysis, B: Environmental, 61 (3–4), – CrossRef Google Scholar. Materials Science; Published ; Thermal and Catalytic Degradation Kinetics of High-Density Polyethylene Over NaX Nano-Zeolite @inproceedings{ThermalAC, title={Thermal and Catalytic Degradation Kinetics of High-Density Polyethylene Over NaX Nano-Zeolite}, author={Ammar S. Abbas عمار صالح عباس and Marwa G. Saber}, year={} }.

Catalytic pyrolysis behavior of synthesized microporous catalysts (conventional Zeolite Socony Mobil–5 (C-ZSM-5), highly uniform nanocrystalline ZSM-5 (HUN-ZSM-5) and β-zeolite), Mesoporous catalysts (highly hydrothermally stable Al-MCM with accessible void defects (Al-MCM(hhs)), Kanemite-derived folded silica (KFSB) and well-ordered Al-SBA (Al . Under pressure and heat, the long chain polymers of hydrogen, oxygen, and carbon decompose into short-chain petroleum hydrocarbons with a ceiling length of around 18 carbons. Hydrocarbon molecules from the basic materials are split under the impact of the catalytic (carbon material) convertor inside the reactor at 70– °C.


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Catalytic degradation of polymers over zeolites by R. S. Holsenburger Download PDF EPUB FB2

The catalytic degradation of high-density polyethylene to hydrocarbons was studied over different zeolites.

The product range was typically between C3 and C15 hydrocarbons. Distinctive patterns of product distribution were found with different zeolitic by:   Summary This chapter contains sections titled: Introduction Operation Modes Zeolites Polymer‐to‐catalyst Ratio Initial Degradation Mechanism Product Distribution Concluding Remarks References Catalytic Degradation of Plastic Waste to Fuel over Microporous Materials - Feedstock Recycling and Pyrolysis of Waste Plastics - Wiley Online Cited by: 9.

Catalytic degradation of polymers over catalysts has the potential to recover valuable hydrocarbons from waste materials. Polymers were pyrolysed over different catalysts using a specially developed laboratory fluidised bed reactor Cited by:   The major product obtained from the non-catalytic pyrolysis of PE was 80 wt% of wax, while the degradation of PP without any catalyst produced % of liquid.

In catalytic degradation, ultra-stable Y (USY) zeolite was used in a ratio ofwith respect to PE and by:   The purpose of this study is to evaluate the performance of the natural zeolite (NZ) in the catalytic degradation of PS.

The emphasis of this study is also placed on the kinetic analysis of catalytic degradation of PS. A dynamic model was applied to predict the catalytic degradation of PS over NZ by TGA method. Experimental Cited by: Covering the breadth of zeolite chemistry and catalysis, this book provides the reader with a complete introduction to field, covering synthesis, structure, characterisation and ing with the history of natural and synthetic zeolites, the reader will learn how zeolite structures Catalytic degradation of polymers over zeolites book formed, synthetic routes, and experimental and theoretical structure.

Catalytic modification of pyrolysis products of nitrogen-containing polymers over Y zeolites - Green Chemistry (RSC Publishing) Pyrolysis products of nitrogen-containing polymers have been transformed at °C over NaY and ultra stable HY (HUSY) zeolite on-line and analysed by gas chromatography/mass spectrometry.

This indispensable two-volume handbook covers everything on this hot research field. The first part deals with the synthesis, modification, characterization and application of catalytic active zeolites, while the second focuses on such reaction types as cracking, hydrocracking, isomerization, reforming and other industrially important topics.

The catalytic activity of zeolites decreases as BEA > ZSM-5a (Si/Al = ) > ZSM-5b (Si/Al = 25) > MOR depending on pore size and acidity of the catalysts. On the other hand, initial degradation is relatively faster over MOR and BEA than that over both ZSM-5 catalysts depending on the apparent activation energy.

Catalytic degradation of polymers over catalysts has the potential to recover valuable hydrocarbons from waste materials. Polymers were pyrolysed over different catalysts using a specially developed laboratory fluidised bed reactor operating isothermally under ambient pressure.

The yield of volatile hydrocarbons (based on the feed) was typically zeolites (HZSM. The catalytic degradation of polyethylene over two commercial cracking catalysts, containing 20% and 40% ultrastable Y zeolite, respectively, was studied in a semi-batch reactor. More specifically, the effect of the polymer to catalyst ratio – expressed as the acidity content of the polymer/catalyst system – was studied on the formation of liquid.

The catalytic degradation of polymeric materials has been reported for a large range of model catalysts, including amorphous silica-alumina, zeolites Y, mordenite and ZSM Catalytic degradation of high density polyethylene over nanocrystalline HZSM-5 zeolite J.F.

Mastral, C. Berrueco, M. Gea, J. Ceamanos* Department of Chemical and Environmental Engineering, C.P.S, University of Zaragoza, Marı´a de Luna 3, Zaragoza, Spain Received 20 December ; received in revised form 31 May ; accepted 16 June. Abstract A two-stage catalytic degradation of polyethylene using amorphous silica−alumina and HZSM-5 zeolite catalysts in series has been developed for converting the polymer into high-quality gasoline-range fuels.

Compared with the one-stage degradation over each catalyst, the two-stage method provides some advantages. The use of acid catalysts can enhance the thermal degradation of synthetic polymers which may be monitored by thermogravimetry [6].

In this work the degradation of high density polyethylene (HDPE) was processed in the presence of acid H-AlMCM and the results of the catalytic and thermal degradation were compared.

The kinetics of the process. Catalytic degradation of polyolefins using different zeolite catalysts which have proper acid strength, pore size and pore structure has been used as sources in fuels or chemicals (Kim. The catalytic cracking of polyethylene has been studied over two natural clays and their pillared analogues with a view toward assessing their suitability in a process for recycling plastic waste to fuel.

Although these clays were found to be less active than US-Y zeolite around K, at slightly higher process temperatures, they were able to completely decompose. Special Book Collections resulting in a complex composition of products. Catalytic degradation over zeolites provides an effective route to selectively convert PMMA into desired products at lower temperatures, since zeolites have high acidity and shape-selectivity.

In this work, the degradation of PMMA over various zeolites, including ZSM   We compared the catalytic behavior of ITQ with that of the two zeolites used industrially for carrying out disproportionation of toluene, ZSM-5 and mordenite.

We selected ZSM-5 and mordenite zeolite samples with the same, or close to the same, Si/Al ratios as that of ITQ (see experimental details in materials and methods).

Catalytic pyrolysis of polymers over catalysts has the potential to recover valuable hydrocarbons from waste materials. Polyolefins were pyrolyzed over catalysts using a specially developed laboratory fluidized bed reactor operating isothermally at ambient pressure. The systematic experiments carried out with several catalysts show that under appropriate reaction.

Polymer degradation by the catalytic cracking process has been investigated as an important way of hydrocarbon recovery with high added value.

In addition, the effects of the catalyst properties and their behavior during the catalytic degradation of polyolefins have been studied using thermogravimetric analysis. In this context, the present work compares the interactions .The pyrolysis of poly (ethylene terephthalate) (PET) in the presence of ZSM-5 zeolite and NiCl2 as a catalyst was studied at different temperatures under N2 atmosphere.

Quantitative 13C nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FT-IR) were applied to characterize the waxy and solid residue. The carboxyl and aliphatic hydroxyl groups .In contrast, vinyl polymers, such as polyolefin s (PP and PE) cannot be degraded with simple chemicals to their monomers due to the random schission of the C-C bonds.

Two main chemical recycling routes are the thermal and catalytic degradation of these polymers. In thermal degradation, the process produces a broad product range and requires high.