Catalytic degradation of polyethylene over SAPO-37 molecular sieve

Fernandes, Glauber José Turolla; Fernandes, Valter J.; Araújo, Antônio S.

doi:10.1016/s0920-5861(02)00074-3

Cited by 46 publications

(21 citation statements)

References 5 publications

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“…This is consistent with the reported literature 11 . Fernandes et al 12 studied the thermal decomposition of high-density polyethylene in the presence of silicoaluminophosphate as catalyst and concluded that thermal decomposition of polyethylene can be enhanced in the presence of this catalyst.…”

Section: 4mentioning

confidence: 99%

Catalytic Thermal Decomposition of Polyethylene by Pyrolysis Gas Chromatography

Nisar

Ali

Awan

2011

J. Chil. Chem. Soc.

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An experimental study of the thermal decomposition of polyethylene in an inert atmosphere has been carried out in the temperature range 300-800°C using Shimadzu PYR-2A pyrolyzer for heating the sample. The method allows the accurate control and measurement of the pyrolysis temperature. The production of hydrocarbons and the corresponding monomers of these polymeric systems were monitored. The effects of variation of temperature, sample size, pyrolysis atmosphere, residence time and catalyst on the distribution of these products were studied. As the carrier gas rapidly swept the primary products from the hot zone into the chromatographic column, so the secondary decomposition is largely eliminated and the pyrolysis products give accurate information about the nature, composition and structure of the pyrolysis material.

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Section: 4mentioning

confidence: 99%

Catalytic Thermal Decomposition of Polyethylene by Pyrolysis Gas Chromatography

Nisar

Ali

Awan

2011

J. Chil. Chem. Soc.

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“…It was reported that the activation energy for HDPE alone decreased from 290 kJ mol −1 to 220 kJ mol −1 with 25%SAPO-37/HDPE, providing evidence that SAPO-37 is an effective catalyst for polyethylene degradation [6].…”

Section: Introductionmentioning

confidence: 97%

Catalytic degradation of high-density polyethylene over SAPO-34 synthesized with various templates

Park

Heo

Park

et al. 2010

Korean J. Chem. Eng.

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A variety of SAPO-34 catalysts were prepared using various templates, such as tetraethylammonium hydroxide (TEAOH), diethylamine (DEA), and a mixture of TEAOH and DEA, and then applied for the first time to the pyrolysis of high-density polyethylene (HDPE). The crystal morphology and physicochemical properties were affected by the type of template employed. In particular, an inexpensive SAPO-34 catalyst, with good crystal properties and catalytic performance, was obtained using a mixed-template of DEA and TEAOH. Through N 2 isotherm, XRD, SEM and NH 3 TPD the effects of the mixed-template on the crystal morphology and acidity were investigated. The catalytic activity of SAPO-34 in the pyrolysis of HDPE was improved with the use of a mixed-template, due to the crystal size, surface area and acidity.

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“…Vários tipos de catalisadores utilizados na pirólise de poliolefinas têm sido estudados: ZSM-5 [4] , H-ZSM-5 [5] , MCM-41 [6] , H-AL-MCM-41 [7] , SAPO [8,9] , como também trabalhos que utilizam argilas, como Lama vermelha [10] e Caulim [3] . O baixo custo, alta resistência térmica, além da estrutura que possibilita a criação de poros e aumento da área superficial após tratamentos, como calcinação e lixiviação ácida, tornam as argilas materiais alternativos para a catálise [11] .…”

Section: Introductionunclassified

Pirólise catalítica do PEBD usando como catalisador a vermiculita modificada

et al. 2016

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ResumoO polietileno de baixa densidade (PEBD) é um dos polímeros mais usados atualmente, e a grande quantidade desse polímero produzida resulta em toneladas de resíduos, que necessitam ser tratados. Neste trabalho foi realizada a pirólise termocatalítica do PEBD usando como catalisador a argila vermiculita modificada, como alternativa para o tratamento dos resíduos. A argila foi tratada com solução de ácido nítrico a diferentes concentrações e calcinada a 400 °C. Os materiais foram caracterizados por técnicas de difratometria de raios X, termogravimetria, adsorção de nitrogênio e espectroscopia de energia dispersiva. A pirólise térmica e termocatalítica foi realizada em um micro reator acoplado com GC/MS, a 500 °C. O intuito da pirólise de resíduos poliméricos é a obtenção de hidrocarbonetos leves (C<16), que possam ser empregados na indústria química e petroquímica, através de quebras na cadeia polimérica. Os resultados foram satisfatórios, com aumento no rendimento para hidrocarbonetos leves ao empregar os catalisadores chegando a 71,4% de produtos com C<16, enquanto a pirólise térmica resultou apenas de 25,8%. Palavras-chave: vermiculita, argila, pirólise, PEBD. AbstractLow density polyethylene (LDPE) is one of the most commonly-used polymers currently, and the great quantity of this polymer produced results in tons of waste that must be treated. We studied the thermocatalytic pyrolysis of LDPE with a modified clay vermiculite catalyst as an alternative for treatment of waste. The clay was treated with a solution of nitric acid at different concentrations and calcined at 400 °C. The materials were characterized by X-ray diffraction, thermogravimetry, nitrogen adsorption, and energy dispersive spectroscopy. Thermal and thermocatalytic pyrolysis were carried out in a microreactor coupled with GC/MS at 500 °C. The aim of the polymeric waste pyrolysis is the obtainment of light hydrocarbons (C<16), which can be used in the chemical and petrochemical industry, through breaks in the polymer chain. The results were satisfactory, with an increase in yield for light hydrocarbons by using catalysts reaching up to 71.4% of products with C<16, whereas thermal pyrolysis resulted in only 25.8%.

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Catalytic degradation of polyethylene over SAPO-37 molecular sieve

Cited by 46 publications

References 5 publications

Catalytic Thermal Decomposition of Polyethylene by Pyrolysis Gas Chromatography

Catalytic Thermal Decomposition of Polyethylene by Pyrolysis Gas Chromatography

Catalytic degradation of high-density polyethylene over SAPO-34 synthesized with various templates

Pirólise catalítica do PEBD usando como catalisador a vermiculita modificada

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