Fe/ZSM-5 zeolites for organic-pollutant removal in the gas phase: Effect of the iron source and loading

Aziz, Abdul; Kim, Sung-Youn; Kim, Kwang S.

doi:10.1016/j.jece.2016.06.021

Cited by 17 publications

(9 citation statements)

References 35 publications

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“…Table 1 also shows that the micropore volumes of the modified catalysts A4 and A5 were significantly lower compared to that of the conventional ZSM-5 zeolite, while those of A2 and A3 were higher. The results correspond with the expectation of an increase in pore volume due to acid treatment and also due to the decrease in iron loading [18]. The FTIR result in Fig.…”

Section: Catalysts Characterizationsupporting

confidence: 88%

“…The intensities reduce and broaden for A3, A4 and A5, as a result of iron impregnation, while it becomes sharper for A2 (acid-treated ZSM-5), implying pores were opened more. Hence, the metal impregnation inside the inner pores of the catalyst was achieved, as reported in the literature [18]. This shows that there is no structural damage and the ZSM-5 catalysts have their distinct properties.…”

Section: Catalysts Characterizationsupporting

confidence: 69%

“…In particular, there are no peaks at 2θ value(s) of 33.15° and 35.65° (which indicate the presence of iron oxide). This lack of XRD peaks for iron oxide may be because of the small amount of iron loaded (maximum 1 wt%) which was also reported by Aziz et al [18]. This may be because the loading of the iron is less than 5 wt% [19].…”

Section: Characterization Of the Ldpe Condensate Using Ftir And Gc/msmentioning

confidence: 57%

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Catalytic reforming of gaseous products from pyrolysis of low-density polyethylene over iron-modified ZSM-5 catalysts

et al. 2019

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Converting plastic wastes into fuels through catalytic cracking is continuously gaining interest from researchers worldwide. In this study, the influence of iron on ZSM-5 (Fe-ZSM-5) catalyst on the reforming of the gaseous products of thermal decomposition of low-density polyethylene (LDPE) was investigated. The acidified ZSM-5 catalysts (0, 0.3, 0.6 and 1 wt% of Fe) were prepared and characterized by XRD, BET, FTIR and SEM techniques. In particular, the effects of temperature (400, 450 and 500 °C) and catalyst loading (0.5, 0.75, 1.0, 1.25 and 1.5 g) on a two-stage (pyrolyser and reformer) decomposition of the LDPE wastes into fuel were studied. The liquid fraction produced was characterized using FTIR and GC/MS techniques. The study showed that the increase in pyrolysis temperature (400-500 °C) increases the volume of non-condensable gas (31-58 wt%) and decreases the volume of the condensates (69-41 wt%) in both the thermal and catalytic pyrolyses. However, the trend was at higher level for the catalytic pyrolysis. The increase in temperature for the thermal pyrolysis had less significant effect on the aromatization content of the liquid condensate compared to the catalytic pyrolysis. The FTIR results show a significant increase in aromatic contents and decrease in the aliphatic of the liquid fraction for the catalytic pyrolysis reforming when compared with thermal pyrolysis. The GC/MS results confirmed the aromatic hydrocarbon compositions, predominantly p-xylene, increased relatively to about 70% in the liquid fraction for the best catalyst (1.25 g of catalyst and 1 wt% iron loading on ZSM-5 at 450 °C).Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Catalysts Characterizationsupporting

confidence: 88%

Section: Catalysts Characterizationsupporting

confidence: 69%

Section: Characterization Of the Ldpe Condensate Using Ftir And Gc/msmentioning

confidence: 57%

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Catalytic reforming of gaseous products from pyrolysis of low-density polyethylene over iron-modified ZSM-5 catalysts

et al. 2019

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“…It can be observed that there is a slight decline in the XRD peak intensity of iron-Z-A. The fall in the crystallographic pattern hints at the uniformity of iron in the zeolite [39]. However, a distinct XRD peak of Z-A spiked at 27.9 • , which is considered to be a sodalite peak.…”

Section: Xrd Analysismentioning

confidence: 98%

“…Many research teams tried to resolve this problem by using different iron sources. Aziz et al (2016) [39], synthesized Iron-ZSM-5 material in which the iron source was AIC (ammonium iron citrate). It possessed regenerative properties which have potential application in wastewater treatment and catalysis.…”

Section: Introductionmentioning

confidence: 99%

Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach

et al. 2019

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Iron was incorporated into an LTA type zeolite using the sol-gel hydrothermal method to form Iron-zeolite-A (Iron-Z-A), and its phosphate adsorption-desorption efficiency were analyzed. Samples were characterized by EDS, SEM, XRD, EPR, FT-IR XPS, and Raman to ensure the apt synthesis of Iron-Z-A and to interpret the mechanism of adsorption-desorption of PO43− in an aqueous solution. EPR and XPS analysis confirmed that the iron was doped as Fe3+ in the LTA structure. The XPS peak shift (Fe-2p), FT-IR band shift, and intensity change (–OH) confirmed the existence of the ligand exchange mechanism. In the adsorption phase at pH 5, the derivative of phosphate (H2PO4−) acts as a ligand and interacts with OH of Fe on the zeolite surface to form “Iron-zeolite (oxy) hydroxide bound phosphate”. In the desorption phase at pH 10, phosphate ligand is detached and get mixed in the aqueous phase as HPO42−. The EDS data, Si–O–Al band shift and intensity change in FT-IR and XPS peak intensity change proved the contribution of Al in the process of adsorption. The data of adsorption fitted well with the Langmuir’s isotherm and pseudo-second-order kinetic model. The amount of PO43− adsorbed was a function of adsorbent’s surface area regardless of concentration. The amount of PO43− being adsorbed by the metal ions was found to be 382.296 mg PO43−/g Fe and 56.296 mg PO43−/g Al.

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Facile Synthesis of Proton‐Type ZSM‐5 by Using Quasi‐Solid‐Phase (QSP) Method

Fan

Tuo

Wang

et al. 2020

Chemistry A European J

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Herein, as imple and green quasi-solid-phase (QSP) method forf acile synthesis of proton-type ZSM-5 avoiding use of excessive water,d ry gel, Na + cation and fluoridei sr eported. Crystallization by using the stoichiometric amounto fT PAOH (tetrapropylammonium hydroxide) at 180 8Cf or only 12 hg ave well-structured HZSM-5 crystalsw ith high specific surface area of 429 m 2 g À1 and high thermals tability. 5MRs was observed to closely relate the formation of MFI structurea nd QSP method exhibits shorteri nduction period (t 0), higher nucleation rate (V n), and faster growth rate (V g). Moreover,H Z-12-180 showed extremely better and rather stable catalytic activityf or methanol-to-propylene reaction by comparison with com-mercialH ZSM-5. Zeolite usually has uniform crystal structures, unique pore systems, controllable acid sites, and high thermal/hydrothermal stability, [1-3] enabling them to be used as excellent catalysts, [4-9] adsorbents, [10, 11] and ion exchange materials. [12] They have been widely applied in the fields of petroleum and fine chemical preparation. [13-17] Proton-type ZSM-5 (HZSM-5), either as as olid acid catalyst or as upport, has been used widely in shape-selective catalysis. [18-22] Generally,Z SM-5 is synthesizedv ia ah ydrothermal method using liquid silica sourcesand large amount of water.

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Fe/ZSM-5 zeolites for organic-pollutant removal in the gas phase: Effect of the iron source and loading

Cited by 17 publications

References 35 publications

Catalytic reforming of gaseous products from pyrolysis of low-density polyethylene over iron-modified ZSM-5 catalysts

Catalytic reforming of gaseous products from pyrolysis of low-density polyethylene over iron-modified ZSM-5 catalysts

Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach

Facile Synthesis of Proton‐Type ZSM‐5 by Using Quasi‐Solid‐Phase (QSP) Method

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