Fabrication of Fly Ash‐Based Mesoporous Aluminosilicate Oxides Loaded with Zinc and its Synergistic Fire Resistancy in Polypropylene

Zhang, Sheng; Tang, Wufei; Li, Limin; Li, Hongfei; Sun, Jun; Gu, Xiaoyu; Chen, Shou; Peng, Xiaohua; Bourbigot, Serge

doi:10.1002/vnl.21726

Cited by 7 publications

(8 citation statements)

References 30 publications

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“…CFA from an Indian coal gasification plant underwent NaOH fusion followed by hydrothermal treatment in order to produce basic CFA-derived zeolite X (NaX/CFA) [23] and, after acidification, HX/CFA. Many studies are found in literature on different applications of CFA-derived zeolites, such as adsorbent material for gas and water treatment [23,24] or binder for flame retardants [25]. As far as we know, just a few of these studies regard experimentations as catalysts in pyrolysis of plastics [26,27] and none have investigated the effects of CFA-derived zeolites on a real plastic waste.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Pyrolysis of a Residual Plastic Waste Using Zeolites Produced by Coal Fly Ash

et al. 2020

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The plastic film residue (PFR) of a plastic waste recycling process was selected as pyrolysis feed. Both thermal and catalytic pyrolysis experiments were performed and coal fly ash (CFA) and X zeolites synthesized from CFA (X/CFA) were used as pyrolysis catalysts. The main goal is to study the effect of low-cost catalysts on yields and quality of pyrolysis oils. NaX/CFA, obtained using the fusion/hydrothermal method, underwent ion exchange followed by calcination in order to produce HX/CFA. Firstly, thermogravimetry and differential scanning calorimetry (TG and DSC, respectively) analyses evaluated the effect of catalysts on the PFR degradation temperature and the process energy demand. Subsequently, pyrolysis was carried out in a bench scale reactor adopting the liquid-phase contact mode. HX/CFA and NaX/CFA reduced the degradation temperature of PFR from 753 to 680 and 744 K, respectively, while the degradation energy from 2.27 to 1.47 and 2.07 MJkg−1, respectively. Pyrolysis runs showed that the highest oil yield (44 wt %) was obtained by HX/CFA, while the main products obtained by thermal pyrolysis were wax and tar. Furthermore, up to 70% of HX/CFA oil was composed by gasoline range hydrocarbons. Finally, the produced gases showed a combustion energy up to 8 times higher than the pyrolysis energy needs.

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Section: Introductionmentioning

confidence: 99%

Catalytic Pyrolysis of a Residual Plastic Waste Using Zeolites Produced by Coal Fly Ash

et al. 2020

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“…Furthermore, addition of FA showed a little enhancement in thermal stability of the IFR/PP, in which T 5% increased by 7°C, and the residue at 800°C upgraded from 8.7% to 11.4%. This could be attributed to the presence of SiO 2 and Al 2 O 3 in the FA that accelerated charring and made the char layer more compact and tougher 31,32 …”

Section: Resultsmentioning

confidence: 99%

Synergistic effect of fly ash on hydroxymethylated lignin‐containing flame retardant polypropylene: Flame retardancy and thermal stability

Song

Zong

Shan

et al. 2020

Polymers for Advanced Techs

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In this study, fly ash (FA) was used as a synergist to enhance the fire resistance of intumescent flame retardant polypropylene containing hydroxymethylated lignin. Effects of fly ash on flame retardancy and thermal stability properties of polypropylene (PP) composites were investigated using a limiting oxygen index (LOI) meter, UL‐94 vertical combustion tester, cone calorimeter, and thermogravimetric analyzer. The results showed that during combustion, incorporation of FA can effectively solve the dripping problem of the PP composites. Addition of 0.5% loading amount fly ash into the PP composite (0.5FA/IFR/PP) enhanced the flame retardancy significantly. Additionally, its LOI value increased from 28% to 33%, and UL‐94 vertical burning passed V‐0 grade from V‐2 rate. Notably, owing to addition of the fly ash, the peak of heat release rate of the pure PP decreased by 58.0%. Moreover, the release of CO2 and CO was largely suppressed, and higher char residue was obtained for 0.5FA/IFR/PP. Fire safety of the PP composites was significantly improved. From the analysis of charring residues, a possible flame retardant mechanism was proposed. That is, incorporation of fly ash increased the formation of a denser and intact char layer, which is important in inhibiting heat and flammable gases generated during combustion of underlined matrix.

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“…And the effective diameter of the microporous for 3A, 4A and 5A is approximately 3, 4 and 5 Å, respectively . Interestingly, some studies found MA became more active after loaded by rare earth metal . Such as La 3+ , it will be inserted the channels and chelated by Si‐O groups of the MA.…”

Section: Introductionmentioning

confidence: 99%

Efficient approach to enhancing the fire resistance of polypropylene by modified microporous aluminosilicate from kaolinite as synergist

Wang

Liu

et al. 2019

Polymers for Advanced Techs

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In this work, kaolinite (K) was firstly converted to one kind of microporus aluminosilicate (4A) by a green andeconomical method, which was thenacted as the precursor to synthesize two other microporus aluminosilicate (3A and 5A) by ions exchange.After modified and loaded with one kind of rare earth ion (La 3+ ), the final product (A-La) was then used as synergist to enhance fire retardant property for polypropylene (PP) with intumescent flame-retardants (IFR). The properties of PP composites for thermal stability and flame retardant were studied and demonstrated that A-La, especially 4A-La, had the most obviously flame-retardant effect. Meanwhile, the macro/ micro-structure of char residues and real-time fourier transform infrared spectroscopy (FTIR) after heating also showed that A-La were helpful to promote the formation of homogenous and compact intumescent char layer. This dense carbon layer can effectively control the convection of combustion gases mixture, and heat transfer between underlying matrix and outside environment. K E Y W O R D S flame retardant, kaolinite, Microporus aluminosilicate, polypropylene 1 | INTRODUCTION Microporus aluminosilicate (MA) is a kind of three-dimensional structure with high crystallinity, large surface area, thermal stability and containing the alkali earth metals or metals groups. 1-3 It shows special structure of sockets and interconnected channels that containing compensational ions such as Na + , Ca 2+ and K + . This structure endows MA with high cation exchange capacity and catalytic efficiency in many fields, such as purification, sewage treatment, industrial catalysis and so on. 4,5 More than 20 years ago, MA were firstly used in flame retardantscience for polymer and then its application and research was rapidly promoted in this filed. 6,7 Meanwhile, even though some literatures have concerned and compared the basic properties of MA and its modified products, such as adsorbability and catalyticactivity and so on, there are still few reported about flame retardant effect in polymer composites using a series of different kinds of MA and modified MA with special structure and composition. 8,9Moreover, taking into account of the storage capacity and purity of nature MA for special applications is limited, therefore, it is important and necessary to synthesize high-quality MA by using cheap and plentiful raw resources, as well as green and economical technology in order to meet the requirement in applications field in the future. Fortunately, cheap and abundant of nature K with formula of Si 2 Al 2 O 5 (OH) 4 and similar SiO 2 /Al 2 O 3 ratio to that of MA can be used as a raw resource to synthetic MA. 10-12 Therefore, it is a reasonable way to obtain a series of MA with higher added value from K. [13][14][15] 4A is one kind of MA, and it is usually synthesized with the changeable cation of Na + . 3 Other changeable cations such as K + and Ca 2+ are also used, and the corresponding product is 3A and 5A, respectively. 16 And the effective diameter of the microporous for 3...

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Fabrication of Fly Ash‐Based Mesoporous Aluminosilicate Oxides Loaded with Zinc and its Synergistic Fire Resistancy in Polypropylene

Cited by 7 publications

References 30 publications

Catalytic Pyrolysis of a Residual Plastic Waste Using Zeolites Produced by Coal Fly Ash

Catalytic Pyrolysis of a Residual Plastic Waste Using Zeolites Produced by Coal Fly Ash

Synergistic effect of fly ash on hydroxymethylated lignin‐containing flame retardant polypropylene: Flame retardancy and thermal stability

Efficient approach to enhancing the fire resistance of polypropylene by modified microporous aluminosilicate from kaolinite as synergist

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