Pyrolysis-Catalytic-Dry Reforming of Waste Plastics and Mixed Waste Plastics for Syngas Production

Saad, Juniza Md; Williams, Paul T.

doi:10.1021/acs.energyfuels.5b02508

Cited by 64 publications

(35 citation statements)

References 24 publications

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“…However, the dry reforming of the volatiles derived from waste plastics leads to a significant H 2 production. 79 The oxidative steam reforming or oxygen co-feeding is a common strategy applied in catalytic steam reforming for the attenuation of the endothermicity of the process. Although the presence of oxygen in the reforming reactor contributes to reducing H 2 production, it also has positive effects, such as the in situ combustion of the coke deposited on the catalysts and therefore, stability improvement.…”

Section: Pyrolysis and In-line Steam Reformingmentioning

confidence: 99%

Progress on Catalyst Development for the Steam Reforming of Biomass and Waste Plastics Pyrolysis Volatiles: A Review

et al. 2021

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In recent decades, the production of H 2 from biomass, waste plastics, and their mixtures has attracted increasing attention in the literature in order to overcome the environmental problems associated with global warming and CO 2 emissions caused by conventional H 2 production processes. In this regard, the strategy based on pyrolysis and in-line catalytic reforming allows for obtaining high H 2 production from a wide variety of feedstocks. In addition, it provides several advantages compared to other thermochemical routes such as steam gasification, making it suitable for its further industrial implementation. This review analyzes the fundamental aspects involving the process of pyrolysis-reforming of biomass and waste plastics. However, the optimum design of transition metal based reforming catalysts is the bottleneck in the development of the process and final H 2 production. Accordingly, this review focuses especially on the influence the catalytic materials (support, promoters, and active phase), synthesis methods, and pyrolysis-reforming conditions have on the process performance. The results reported in the literature for the steam reforming of the volatiles derived from biomass, plastic wastes, and biomass/plastics mixtures on different metal based catalysts have been compared and analyzed in terms of H 2 production.

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Section: Pyrolysis and In-line Steam Reformingmentioning

confidence: 99%

Progress on Catalyst Development for the Steam Reforming of Biomass and Waste Plastics Pyrolysis Volatiles: A Review

et al. 2021

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“…Several authors promoted two-stage reactors for pyro-gasification, whereby in the first stage pyrolysis takes place, and the evolved gases from pyrolysis are passed to the second reactor where (catalytic) dry reforming by carbon dioxide or reforming by steam occurs [67]- [69]. Serrano et al 2012 [70] and Williams 2016 [32] highly recommended two-stage 'pyrolysis catalysis' as this improves contact between pyrolysis products and catalyst, enables the reacted catalysts to be recycled, makes the process more controllable (temperature at each stage; greater control of catalytic process conditions) and finally makes that waste residues and dirt associated with the plastics remain in the pyrolysis unit.…”

Section: Gasifiersmentioning

confidence: 99%

Co-pyrogasification of Plastics and Biomass, a Review

Block¹,

Ephraim

Weiss-Hortala

et al. 2018

Waste Biomass Valor

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Over the past few decades, the sharp rise in post-consumer plastic and biomass waste has resulted in an ever growing challenge to treat such waste sustainably. Co-pyrogasification of plastics and biomass mixtures, as opposed to separately converting these waste streams, offers several advantages including an improvement in syngas quality and composition (H2/CO ratio) in relation to the desired application, and an easier reactor feeding of plastics. Furthermore, many studies have shown that co-pyrogasification promotes the conversion of waste to gas rather than char and tar. However, in order to achieve the desired product distribution or syngas composition, operating parameters such as the reactor temperature, equivalence ratio (air or oxygen), steam/fuel ratio and catalyst, have to be optimized. Thus, this paper aims to review literature studies on the co-pyrogasification of plastics and biomass by considering various aspects including the process principle, reactors, influence of feedstock characteristics and operating parameters on the products, as well as the synergies observed during the thermoconversion of plastics and biomass mixtures with some reference to coal mixtures when necessary.

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“…Namioka et al [29] performed the pyrolysis-reforming of PP and PS, with hydrogen production being 36 and 33 wt%, respectively. Recently, Saad and Williams [28] studied the pyrolysis and in-line dry reforming of different plastics, obtaining hydrogen productions of 15, 7.6 and 2.5 wt% for PE, PS and PET, respectively.…”

Section: Pyrolysis and In-line Reforming Of Different Plasticsmentioning

confidence: 99%

“…Nevertheless, this strategy has been scarcely studied and the results reported were mainly obtained in lab scale units [6]. The studies by the team of Professor Williams [25][26][27][28] were carried out in a system in which pyrolysis is carried out in discontinuous regime in a fixed bed reactor and the volatiles are reformed in a second fixed bed. The reaction equipment used by the team of Professor Yoshikawa [29,30] is a step forward, as it operates in continuous regime, although the use of fixed beds for pyrolysis and reforming can involve serious limitations for the process scale up.…”

Section: Introductionmentioning

confidence: 99%

Waste Plastics Valorization by Fast Pyrolysis and in Line Catalytic Steam Reforming for Hydrogen Production

Barbarias¹,

Arregi²,

Artetxe³

et al. 2020

Recent Advances in Pyrolysis

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This chapter summarizes the most recent results obtained in the plastic waste pyrolysis-reforming strategy for hydrogen production. An original two-reactor configuration consisting of a conical spouted bed reactor for the pyrolysis step and a fluidized bed reactor for the pyrolysis volatile reforming is proposed. The fundamental aspects and challenges of this joint process are discussed in detail, and the prospects for the full-scale implementation of this valorization route are assessed. Thus, the influence the main reforming parameters (temperature, space time and steam/ plastic ratio) have in the pyrolysis-reforming of HDPE on product yields and catalyst stability are reported. Moreover, the role played by plastic composition on process performance is also described by studying the influence of following polymers: high density polyethylene (HDPE), polypropylene (PP), polyethylene terephthalate (PET) and polystyrene (PS). The operating conditions used for the valorization of different plastics have been as follows: pyrolysis temperature of 500°C, reforming temperature of 700°C, space time of 16.7 g catalyst min g plastic −1 and steam/plastic ratio of 4.

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Pyrolysis-Catalytic-Dry Reforming of Waste Plastics and Mixed Waste Plastics for Syngas Production

Cited by 64 publications

References 24 publications

Progress on Catalyst Development for the Steam Reforming of Biomass and Waste Plastics Pyrolysis Volatiles: A Review

Progress on Catalyst Development for the Steam Reforming of Biomass and Waste Plastics Pyrolysis Volatiles: A Review

Co-pyrogasification of Plastics and Biomass, a Review

Waste Plastics Valorization by Fast Pyrolysis and in Line Catalytic Steam Reforming for Hydrogen Production

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