Fe-, Ti-, Zr- and Al-pillared clays for efficient catalytic pyrolysis of mixed plastics

Li, Kaixin; Lei, Junxi; Yuan, Guang; Weerachanchai, Piyarat; Wang, Jing‐Yuan; Zhao, Jun; Yang, Yanhui

doi:10.1016/j.cej.2017.02.113

Cited by 124 publications

(69 citation statements)

References 52 publications

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“…In the present work, four natural clays (denoted C1, C2, C3 and a well-known reference material BV) were, therefore, modified with a mixed intercalating

solution, prepared according to a widely reported methodology [ 13 , 18 , 23 , 24 , 25 ]. The samples presented different: (i) clay content, (ii) distribution of clayey phases (iii) CEC, (iv) distribution of exchangeable cations (sodium, calcium or magnesium), (v) chemical composition, with presence of extra-structural iron aggregates, and (vi) textural properties.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Al/Fe-Pillared Clays: Effect of the Starting Mineral

et al. 2017

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Four natural clays were modified with mixed polyoxocations of Al/Fe for evaluating the effect of the physicochemical properties of the starting materials (chemical composition, abundance of expandable clay phases, cationic exchange capacity and textural properties) on final physicochemical and catalytic properties of Al/Fe-PILCs. The aluminosilicate denoted C2 exhibited the highest potential as starting material in the preparation of Al/Fe-PILC catalysts, mainly due to its starting cationic exchange capacity (192 meq/100 g) and the dioctahedral nature of the smectite phase. These characteristics favored the intercalation of the mixed (Al13−x/Fex)7+ Keggin-type polyoxocations, stabilizing a basal spacing of 17.4 Å and high increase of the BET surface (194 m2/g), mainly represented in microporous content. According to H2-TPR analyses, catalytic performance of the incorporated Fe in the Catalytic Wet Peroxide Oxidation (CWPO) reaction strongly depends on the level of location in mixed Al/Fe pillars. Altogether, such physicochemical characteristics promoted high performance in CWPO catalytic degradation of methyl orange in aqueous medium at very mild reaction temperatures (25.0 ± 1.0 °C) and pressure (76 kPa), achieving TOC removal of 52% and 70% of azo-dye decolourization in only 75 min of reaction under very low concentration of clay catalyst (0.05 g/L).

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“…In the present work, four natural clays (denoted C1, C2, C3 and a well-known reference material BV) were, therefore, modified with a mixed intercalating

Section: Introductionmentioning

confidence: 99%

Preparation of Al/Fe-Pillared Clays: Effect of the Starting Mineral

et al. 2017

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“…It displays a combination of type I and II isotherms also with an H3 hysteresis loop quite common in layered clay-derived materials such as PILCs and DPCHs [ 3 , 31 ]. This kind of isotherm is typical of a widely distributed porous texture with a contribution of micro-, meso-, and macropores due to the “house-of cards” distribution of the plate-like particles [ 32 , 33 ]. The addition of 1% of Ag (see 1C2T-Ag1 isotherm) results in a slight decrease of the amount of N 2 adsorbed, probably due to a partial pore blockage by Ag particles.…”

Section: Resultsmentioning

confidence: 99%

Ag-Coated Heterostructures of ZnO-TiO2/Delaminated Montmorillonite as Solar Photocatalysts

et al. 2017

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Heterostructures based on ZnO-TiO2/delaminated montmorillonite coated with Ag have been prepared by sol–gel and photoreduction procedures, varying the Ag and ZnO contents. They have been thoroughly characterized by XRD, WDXRF, UV–Vis, and XPS spectroscopies, and N2 adsorption, SEM, and TEM. In all cases, the montmorillonite was effectively delaminated with the formation of TiO2 anatase particles anchored on the clay layer’s surface, yielding porous materials with high surface areas. The structural and textural properties of the heterostructures synthesized were unaffected by the ZnO incorporated. The photoreduction led to solids with Ag nanoparticles decorating the surface. These materials were tested as photocatalysts for the degradation of several emerging contaminants with different nitrogen-bearing chemical structures under solar light. The catalysts yielded high rates of disappearance of the starting pollutants and showed quite stable performance upon successive applications.

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“…[131] Clays have macroporous structures with milder acidity all of which facilitates moderate polymer cracking to produce heavier products. [131,132,221,222] The large porous nature of clays inhibits increased contact of the polymer with active sites, thus allowing for larger products to desorb prior to further reaction and resulting in the production of liquid fuels similar to that of diesel. [131,221,222] However, due to the large pore diameter, coke precursors fail to form and as a result, such catalysts are more deactivation resistant.…”

Section: Claysmentioning

confidence: 99%

“…Activated carbon [128] LDPE Fe-PILC [132] HDPE Zr-PILC [132] HDPE Ti-PILC [132] HDPE BPA effectiveness of amorphous silica-alumina as a PSW conversion catalyst has been tested with a variety of polymer wastes and plastic waste mixtures. It has been determined that the presence of ASA speeds up polymer decomposition in comparison to thermal degradation as a result of bond activation within the plastic waste molecules.…”

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confidence: 99%

The Use of Heterogeneous Catalysis in the Chemical Valorization of Plastic Waste

2020

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, respectively. Her graduate research focused on the fundamental understanding of deoxygenation mechanisms for biomass probe molecules on single crystals and thin films. During her graduate career, she received the DOE Science Graduate Student Research (SCGSR) award (2019) and conducted surface science research at Brookhaven National Lab. She now is a postdoctoral researcher at the University of Wisconsin-Madison. Her research focuses on surface spectroscopy and controlled design of heterogeneous catalysts. Melissa C. Cendejas received her B.A. (2016) in Chemistry and English from Williams College. There, she worked on the synthesis of conjugated organic molecules and phosphorusbased surfactants. She then started her PhD in Chemistry at the University of Wisconsin-Madison under the supervision of Prof. Ive Hermans. She studies active site formation on boron-based catalysts. She received the DOE Office of Science Graduate Student Research (SCGSR) award (2020) to perfrom in situ x-ray spectroscopy of catalysts at Stanford Synchrotron Radiation Lightsourse. Prof. Dr. Ive Hermans obtained his Ph.D. from KU Leuven University in Belgium in 2006. In addition to his scientific education, he also holds a postgraduate degree in Business Administration (KU Leuven, 2006). After postdoctoral research on in situ spectroscopy and reaction engineering with Prof. Alfons Baiker, he became assistant professor for heterogeneous catalysis (spring 2008) at ETH Zurich in Switzerland. January 2014, Prof. Hermans moved to the University of Wisconsin-Madison, holding a dual appointment in the Department of Chemistry and the Department of Chemical and Biological Engineering. His group focuses on the mechanistic understanding of catalytic technology using a variety of techniques.

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Fe-, Ti-, Zr- and Al-pillared clays for efficient catalytic pyrolysis of mixed plastics

Cited by 124 publications

References 52 publications

Preparation of Al/Fe-Pillared Clays: Effect of the Starting Mineral

Preparation of Al/Fe-Pillared Clays: Effect of the Starting Mineral

Ag-Coated Heterostructures of ZnO-TiO2/Delaminated Montmorillonite as Solar Photocatalysts

The Use of Heterogeneous Catalysis in the Chemical Valorization of Plastic Waste

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