Study on the effect of metal types in (Me)-Al-MCM-41 on the mesoporous structure and catalytic behavior during the vapor-catalyzed co-pyrolysis of pubescens and LDPE

Liu, Wenwu; Hu, Changwei; Yu, Yang; Tong, Dongmei; Zhu, Liangfang; Zhang, Rui-Nan; Zhao, Bohan

doi:10.1016/j.apcatb.2012.09.002

Cited by 58 publications

(24 citation statements)

References 42 publications

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“…In contrast, the influence of high BET surface area of these catalysts on the cracking reactions appeared to be less significant in the pyrolysis of PE/PP mixture. The prominent role of catalyst's acidity observed in our studies is somewhat consistent with the findings reported by Liu et al [27]. Through studying the catalytic performance of different types of MCM-41 in co-pyrolysis of PE and pubescens, they concluded that the catalysts' acidity, rather than the surface area, plays a more significant role in the cracking of primary pyrolytic intermediates.…”

Section: Pyrolysis Yieldssupporting

confidence: 81%

“…The results are in agreement with the observations reported by Aguado et al [26], which showed that the incorporation of aluminum into a siliceous material could perturb the hexagonal ordering of the pores to some extent, giving rise to a wormhole-like structure with a slightly irregular pore arrangement. However, such distorted pore architecture did not appear to have a significant detrimental effect on the catalytic behavior of the mesoporous catalysts, as evidenced by the pyrolysis studies conducted by Liu et al [27].…”

Section: Characterization Of Catalystsmentioning

confidence: 83%

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Investigation into the Catalytic Activity of Microporous and Mesoporous Catalysts in the Pyrolysis of Waste Polyethylene and Polypropylene Mixture

Lee

Yuan

et al. 2016

Energies

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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-41 with accessible void defects (Al-MCM-41(hhs)), Kanemite-derived folded silica (KFS-16B) and well-ordered Al-SBA-15 (Al-SBA-15(wo)) were studied with waste polyethylene (PE) and polypropylene (PP) mixture which are the main constituents in municipal solid waste. All the catalysts were characterized by Brunauer-Emmett-Teller (BET), X-ray powder diffraction (XRD), and NH3-temperature programmed desorption (TPD). The results demonstrated that microporous catalysts exhibited high yields of gas products and high selectivity for aromatics and alkene, whereas the mesoporous catalysts showed high yields of liquid products with considerable amounts of aliphatic compounds. The differences between the microporous and mesoporous catalysts could be attributed to their characteristic acidic and textural properties. A significant amount of C2-C4 gases were produced from both types of catalysts. The composition of the liquid and gas products from catalytic pyrolysis is similar to petroleum-derived fuels. In other words, products of catalytic pyrolysis of plastic waste can be potential alternatives to the petroleum-derived fuels.

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Section: Pyrolysis Yieldssupporting

confidence: 81%

Section: Characterization Of Catalystsmentioning

confidence: 83%

Investigation into the Catalytic Activity of Microporous and Mesoporous Catalysts in the Pyrolysis of Waste Polyethylene and Polypropylene Mixture

Lee

Yuan

et al. 2016

Energies

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“…[11][12][13] Co-gasification with biomass has also been reported to assist the feeding of gasification of plastics into the gasifier. [14][15][16] In addition, plastics pyrolysis has also been used to produce carbon nanotubes (CNTs), a high-value product having extraordinary physical and chemical properties, by either mixing plastics with catalyst in a single reactor, 17,18 or passing the pyrolysis products of plastics into a second stage catalyst reactor.…”

Section: Introductionmentioning

confidence: 99%

Processing Real-World Waste Plastics by Pyrolysis-Reforming for Hydrogen and High-Value Carbon Nanotubes

Nahil

Miskolczi

et al. 2013

Environ. Sci. Technol.

193

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Producing both hydrogen and high-value carbon nanotubes (CNTs) derived from waste plastics is reported here using a pyrolysis-reforming technology comprising a two-stage reaction system, in the presence of steam and a Ni-Mn-Al catalyst. The waste plastics consisted of plastics from a motor oil container (MOC), waste commercial high density polyethylene (HDPE) and regranulated HDPE waste containing polyvinyl chloride (PVC). The results show that hydrogen can be produced from the pyrolysis-reforming process, but also carbon nanotubes are formed on the catalyst. However, the content of 0.3 wt.% polyvinyl chloride in the waste HDPE (HDPE/PVC) has been shown to poison the catalyst and significantly reduce the quantity and purity of CNTs. The presence of sulphur has shown less influence on the production of CNTs in terms of quantity and CNT morphologies. Around 94.4 mmol H 2 g -1 plastic was obtained for the pyrolysis-reforming of HDPE waste in the presence of the Ni-Mn-Al catalyst and steam at a reforming temperature of 800 °C. The addition of steam in the process results in an increase of hydrogen production and reduction of carbon yield; in addition, the defects of CNTs e.g. edge dislocations were found to be increased with the introduction of steam (from Raman analysis).

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“…Czernik and French [20] investigated the gasification of polypropylene using C11-NK (commercial nickel catalyst), recovering 80% hydrogen of the theoretical potential of polypropylene. Liu et al [13] and Ruoppolo et al [21] carried out the cogasification of biomass/plastic mixtures using Ni loaded -Al 2 O 3 and, Ni and Pd loaded Al-MCM-41(mesoporous aluminosilicates), respectively, which also promoted hydrogen production.…”

Section: Introductionmentioning

confidence: 99%

“…However, the yield of hydrogen from biomass is typically low, therefore, addition of plastics which have a high hydrogen content into the biomass feedstock would enhance the amount of hydrogen in the gaseous product stream. Co-pyrolysis for hydrogen production was reported with various biomass-plastic combinations, such as wood-polypropylene [11], pine cone-polypropylene, pine cone-polyethylene, and pine cone-polystyrene [12], and pubescens-low density polyethylene [13]. These investigations were carried out using various reactors such as a fixed-bed reactor, fluidized-bed reactor, spouted-bed reactor, screw kiln reactor, and molten carbonate reactor, however, which are often combined with catalysts in order to improve the hydrogen production.…”

Section: Introductionmentioning

confidence: 99%

Novel Ni–Mg–Al–Ca catalyst for enhanced hydrogen production for the pyrolysis–gasification of a biomass/plastic mixture

Kumagai

Álvarez

Blanco

et al. 2015

Journal of Analytical and Applied Pyrolysis

109

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Abstract:A Ni-Mg-Al-Ca catalyst was prepared by a co-precipitation method for hydrogen production from polymeric materials. The prepared catalyst was designed for both the steam cracking of hydrocarbons and for the in situ absorption of CO 2 via enhancement of the water-gas shift reaction. The influence of Ca content in the catalyst and catalyst calcination temperature in relation to the pyrolysis-gasification of a wood sawdust /polypropylene mixture was investigated.The highest hydrogen yield of 39.6 mol H 2 /g Ni with H 2 /CO ratio of 1.90 was obtained in the presence of the Ca containing catalyst of molar ratio Ni:Mg:Al:Ca = 1:1:1:4, calcined at 500 °C.In addition, thermogravimetric and morphology analyses of the reacted catalysts revealed that Ca introduction into the Ni-Mg-Al catalyst prevented the deposition of filamentous carbon on the catalyst surface. Furthermore, all metals were well dispersed in the catalyst after the pyrolysisgasification process with 20-30 nm of NiO sized particles observed after the gasification without significant aggregation.

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Study on the effect of metal types in (Me)-Al-MCM-41 on the mesoporous structure and catalytic behavior during the vapor-catalyzed co-pyrolysis of pubescens and LDPE

Cited by 58 publications

References 42 publications

Investigation into the Catalytic Activity of Microporous and Mesoporous Catalysts in the Pyrolysis of Waste Polyethylene and Polypropylene Mixture

Investigation into the Catalytic Activity of Microporous and Mesoporous Catalysts in the Pyrolysis of Waste Polyethylene and Polypropylene Mixture

Processing Real-World Waste Plastics by Pyrolysis-Reforming for Hydrogen and High-Value Carbon Nanotubes

Novel Ni–Mg–Al–Ca catalyst for enhanced hydrogen production for the pyrolysis–gasification of a biomass/plastic mixture

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