Robust porphyrin catalysts immobilized on biogenous iron oxide for the repetitive conversions of epoxides and CO2 into cyclic carbonates

Ema, Tadashi; Miyazaki, Yuki; Taniguchi, Tomoya; Takada, Jun

doi:10.1039/c3gc41055b

Cited by 96 publications

(58 citation statements)

References 75 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Biogenic iron oxides have been applied as catalysts in reactions of oxidation 10,[18][19][20] or as an (immobilising) support for catalysts of very high activity. 2,[21][22][23] Investigations in this field are still scarce and concentrated only on a small number of reactions.…”

Section: Introductionmentioning

confidence: 99%

“…These peculiarities create uncertain composition of the materials based on biogenic iron (oxy)hydroxides. Despite some successful attempts to use biogenic materials for catalyst preparation without organics removal, 10,[21][22][23] in any case the synthesis of a catalyst requires known and constant composition of the used material(s) that will define its properties.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Treatment of Biogenic Iron-Containing Materials

Shopska¹,

Cherkezova‐Zheleva²,

Paneva³

et al. 2014

Croat. Chem. Acta

View full text Add to dashboard Cite

Abstract. Biogenic iron oxides could find application in catalysis but their structure and composition should be well characterized. The content of organic rests due to their origin should also be controlled. Samples of natural biomass and biomass obtained after cultivation in Adler's medium of the SphaerotilusLeptothrix group of bacteria were treated by different techniques to reduce or totally remove the organic residues. The aim of the study was to find procedures, which prevent changes in the oxidation state of the iron and of the type of iron-containing compound(s) during treatment. Mössbauer spectroscopy, IRS, DTA, and SEM were used in the study. Chemical treatment with H 2 O 2 or NaOH at room temperature did not significantly change the samples. Thermal treatment in oxidative flow mixture conducted up to 250 °C resulted in a transformation of the iron-containing phases only. The organic matter, which is included in the structure of the particles, cannot easily be affected. DTA revealed that removal of organic rests occurred in the interval of 250-600 °C. However, the transformation of the initial compounds could not be prevented using such a treatment.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Treatment of Biogenic Iron-Containing Materials

Shopska¹,

Cherkezova‐Zheleva²,

Paneva³

et al. 2014

Croat. Chem. Acta

View full text Add to dashboard Cite

show abstract

“…To date, a variety of industrial functions such as lithium-ion battery anode material [24,25], catalyst enhancer [26][27][28], and porcelain pigment [29] have been discovered for the sheaths of Leptothrix. Our previous study further indicated that the chemical character and crystallinity of the sheath matrix can be modified depending on the culture conditions for the strains, especially on the components of the medium [30].…”

Section: Introductionmentioning

confidence: 99%

Direct Adherence of Fe(III) Particles onto Sheaths of Leptothrix sp. Strain OUMS1 in Culture

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…Our previous microscopic and spectroscopic studies proved that the sheath was an ingenious hybrid of organic and inorganic materials produced through the interaction of bacterial exopolymers with aqueous-phase inorganics [5,8,9]. Intriguingly, natural Leptothrix sheaths were discovered to have a variety of the industrial functions: lithium-ion battery anode material [10], catalyst enhancer [11][12][13], and porcelain pigment [14]. The quality and quantity of the natural sheaths, however, are inevitably influenced by environmental changes such as temperature, quantity of supplied groundwater or spring water, concentrations of inorganics in water, as was noted by Vollrath et al [15].…”

Section: Introductionmentioning

confidence: 99%

Use of Iron Powder to Obtain High Yields of Leptothrix Sheaths in Culture

et al. 2015

Self Cite

View full text Add to dashboard Cite

Abstract:The Leptothrix species, Fe-oxidizing bacteria, produce an extracellular, microtubular sheath with a complicated organic-inorganic hybrid nature. We have discovered diverse industrial functions for this material, e.g., electrode material for Li-ion batteries, catalyst enhancers, pigments, plant growth promoters, and plant protectants. To consistently obtain material with the qualitative and quantitative stability needed for industrial applications, we focused on developing an optimum culture system for sheath synthesis by the Leptothrix sp. strain OUMS1. Although we have used Fe plates as an Fe source in the liquid silicon-glucose-peptone medium (SGP), the plates do not yield a consistent quality or precise mass, and formation of Fe-encrusted sheath is restricted to a surface of the plates, which limits harvest yield. In this study, to obtain a high yield of sheaths, we cultured OUMS1 in SGP supplemented with Fe powders. The addition of Fe powders to the medium (up to 14.0 g/L) did not adversely influence growth of OUMS1. The final yield of sheaths was about 10-fold greater than in the Fe plate culture. The sheaths also maintained a microtubular form and crystalline texture similar to those produced on Fe plates

show abstract

Robust porphyrin catalysts immobilized on biogenous iron oxide for the repetitive conversions of epoxides and CO2 into cyclic carbonates

Cited by 96 publications

References 75 publications

Treatment of Biogenic Iron-Containing Materials

Treatment of Biogenic Iron-Containing Materials

Direct Adherence of Fe(III) Particles onto Sheaths of Leptothrix sp. Strain OUMS1 in Culture

Use of Iron Powder to Obtain High Yields of Leptothrix Sheaths in Culture

Contact Info

Product

Resources

About