Layered double hydroxides as supported anionic reagents. Halide-ion reactivity in zinc chromium hexahydroxide halide hydrates [Zn2Cr(OH)6X.nH2O] (X = Cl, I)

Martin, Kévin; Pinnavaia, T. J.

doi:10.1021/ja00263a049

Cited by 91 publications

(29 citation statements)

References 1 publication

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“…The structure of HT is a positively charged brucite-like octahedral layer and a negatively charged interlayer containing anions and water molecules [26]. HT has received increasing attention in recent years as an ion exchanger [27]- [29], catalyst [30], [31] and a material for gas removal [32], [33]. However, there have been no studies on the pyrolysis of waste plastics with bromine compound using hydrotalcite.…”

Section: Intoroductionmentioning

confidence: 99%

Reduction in Content of Bromine Compounds in the Product Oil of Pyrolysis Using Synthetic Hydrotalcite

Morita¹,

Wajima²,

Nakagome³

2015

IJCEA

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Abstract-Polystyrene plastic samples containing brominated flame-retardants (BR-PS) were pyrolyzed at 400 C using hydrotalcite to reduce the content of bromine compounds in the oil produced, in comparison with using sand, zeolite-4A, and zeolite-13X. The bromine plastic sample was prepared by mixing tetrabromobisphenol A and polystyrene, and added to a glass reactor, together with hydrotalcite, sand, zeolite-4A, or zeolite-13X. The product oil obtained by pyrolysis at 400 C from the BR-PS was mainly composed of aromatic compounds, such as benzene, heptane, and toluene, and two bromine compounds, 2-methyl-2-bromopentane and 3-bromopropane. The product oil obtained using hydrotalcite contained aromatic compounds with low molecular weight, and bromine compounds were not detected. In comparison with the use of sea sand and molecular sieves, the amount of bromine compounds in residue decreased in the order of hydrotalcite > molecular sieves 13X > molecular sieves 4A > sand. Hydrotalcite thus trapped bromine in residue during the pyrolysis of BR-PS.

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Section: Intoroductionmentioning

confidence: 99%

Reduction in Content of Bromine Compounds in the Product Oil of Pyrolysis Using Synthetic Hydrotalcite

Morita¹,

Wajima²,

Nakagome³

2015

IJCEA

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“…HT is a layered double hydroxide consisting of a metal complex hydroxide comprising anionic species in the divalent Mg 2+ and trivalent Al 3+ host layers and interlayer of the guest layer [34], [35]. HT is the catalyst [36], [37] and gas removal [38] material for the [39], as ion exchanger [34], [35], [40], [41] has received increasing attention in recent years. High anion exchange capacity comparable to HT organic ion-exchange resins has Effect of Hydrotalcite on Bromine Content in Oil Produced from the Pyrolysis of Acrylonitrile-Butadiene-Styrene Plastics N. Morita, M. Nakayasu, T. Wajima, A. T. Saito, and H. Nakagome…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrotalcite on Bromine Content in Oil Produced from the Pyrolysis of Acrylonitrile-Butadiene-Styrene Plastics

Morita¹,

Nakayasu²,

Wajima³

et al. 2016

IJCEA

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Abstract-In this study, a method is presented to reduce the halogen concentration in the oil produced upon pyrolysis of acrylonitrile-butadiene-styrene (ABS) resins containing brominated flame retardants. More specifically, hydrotalcite was added to a predetermined amount of ABS in a glass reactor, and subjected to pyrolysis at 400 °C in nitrogen atmosphere. The bromine content in the product oil, residue, and gas released upon pyrolysis was analyzed. The main components of the product oil following pyrolysis of ABS in the absence of hydrotalcite additive were toluene, ethylbenzene, styrene, 1-bromomethyl-4-methylbenzene, phenol, n-butyl benzene, 1-methoxy-1-methylethyl benzene, and bromine compounds 2-bromophenol, 4-benzyloxy bromobenzene, 2,6 dibromophenol, and 2-bromotoluene. In contrast, the content of bromine in the product oil decreased when hydrotalcite was added to ABS. Moreover, negligible amounts of bromine were detected when the amount of added hydrotalcite was greater than 8 g. The reduced content of bromine in the product oil was attributed to the efficient trapping of bromine in the hydrotalcite matrix (as determined by the content of bromine in the residue).

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“…Martin et al [55] were the first to realize the exchangeable interlayer anions in the HT-like materials as catalytic centers for enabling chemical transformation wherein they reported that butyl bromide was converted to butyl iodide by the action of interlayer I ) anions in Zn 2 Cr(OH) 6 I 2 AE 2H 2 O. Although the intention of most of the research is to study the anion-exchange properties of the HT-like materials, Drezdzon [56] reported an important contribution wherein he could successfully intercalate various polyoxometallates in the interlayers by different preparation methodologies with an anticipation of using them as catalysts or clay-modified electrodes.…”

Section: Selective Oxidation Over Functionalized Hydrotalcitesmentioning

confidence: 99%

Catalytic applications of hydrotalcite-like materials and their derived forms

Srinivasan

2006

Catal Surv Asia

109

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Hydrotalcite-like (HT-like) materials have been studied extensively in the last three decades. Although these materials initially perceived as potential anion exchangers, unrelenting efforts have also been attempted to use them as catalytic materials or as catalytic supports. There are varied ways by which one can use them for catalysis viz.; 1. Use them in as-synthesized form 2. Use them after calcining where the structural integrity of layered lattice is lost 3. Use the interlayer as functional spaces with moieties of catalytic interest 4. Use them after destruction or delamination and restructuring and 5. Use them as support or matrix. In this review, we are reporting the catalytic applications of HT-like materials and their derived forms carried out in our research group for the last 15 years in these various ways, covering reactions such as nitrous oxide decomposition, selective oxidation of organic compounds of industrial relevance and base-catalyzed isomerization of chemicals of perfumery interest. Although this review primarily focuses on our work, wherever applicable, related or relevant works from other groups are also presented to bestow comprehensiveness.

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Layered double hydroxides as supported anionic reagents. Halide-ion reactivity in zinc chromium hexahydroxide halide hydrates [Zn2Cr(OH)6X.nH2O] (X = Cl, I)

Cited by 91 publications

References 1 publication

Reduction in Content of Bromine Compounds in the Product Oil of Pyrolysis Using Synthetic Hydrotalcite

Reduction in Content of Bromine Compounds in the Product Oil of Pyrolysis Using Synthetic Hydrotalcite

Effect of Hydrotalcite on Bromine Content in Oil Produced from the Pyrolysis of Acrylonitrile-Butadiene-Styrene Plastics

Catalytic applications of hydrotalcite-like materials and their derived forms

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