Preparation and characterization of xerogel catalyst microspheres

Alié, Christelle; Ferauche, Fabrice; Heinrichs, Benoı̂t; Pirard, René; Winterton, N.; Pirard, Jean-Paul

doi:10.1016/j.jnoncrysol.2004.05.019

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…This coagulation mechanism adds an extra dimension of control to the shaping process and the final properties of the material, allowing a very broad structural and physicochemical control of the obtained materials. This technique has already been applied for the controlled shaping process of silica xerogel microspheres [15] [16] and alginate-silica hybrid materials for separation purposes [17]. However, the relationship between suspension composition and control of shaping was not elucidated.…”

Section: Introductionmentioning

confidence: 99%

Development of alumina microspheres with controlled size and shape by vibrational droplet coagulation

Pype

Michielsen

Seftel

et al. 2017

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 99%

Development of alumina microspheres with controlled size and shape by vibrational droplet coagulation

Pype

Michielsen

Seftel

et al. 2017

Journal of the European Ceramic Society

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“…A carbon xerogel monolith with the same pore texture as that of the MX sample was milled in water with a Fritsch Pulverisette 02102 mill for 60 min. It was sieved at 45 μm and dried at 100 ∘ C for 48 h. Two grams of carbon powder were mixed with 6.8 g of ethylene glycol as a dispersing agent, following a previous study, 2.5 mL of the alginate solution and 10 g of water. This carbon suspension was stirred manually then sonicated for 15 min.…”

Section: Methodsmentioning

confidence: 99%

Toward a continuous synthesis of porous carbon xerogel beads

et al. 2018

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A continuous process for producing porous carbon xerogel beads has been developed. It consists in injecting a pre‐cured aqueous solution of resorcinol and formaldehyde on top of a column filled with hot oleic acid. The latter is pumped on the top of the column and fed at the bottom, generating an upward flow that can be adjusted to match the terminal velocity of the settling beads. Thus, the bead residence time in the column can be adjusted to match the gelation time, allowing the beads to solidify before reaching the bottom of the vessel. The obtained beads are subsequently dried and pyrolyzed. The developed experimental setup proved the continuous synthesis of porous carbon beads is possible. Nevertheless, the shaping process caused various texture changes of the porous carbon, which mainly yields macropores instead of micro and mesopores. This process also leads to the build‐up of a denser skin around the beads. © 2018 American Institute of Chemical Engineers AIChE J, 64: 1049–1058, 2018

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Improved treatment approach for the removal of aromatic compounds using polymeric beads in Fenton pretreatment and biological oxidation

Ramteke

Gogate

2016

Environ Sci Pollut Res

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An improved approach based on the use of iron-doped polymeric beads (IPB) as Fenton catalyst in the pretreatment and biomass-doped polymeric bead (BPB) in the biological oxidation has been reported for the removal of different aromatic mixtures present as pollutants in the aqueous solutions. Degradation has been investigated at fixed loading of IPB as 2.5 % weight basis and varying loading of hydrogen peroxide so as to understand the effect of oxidant loading on the extent of degradation. It has been observed that the maximum removal efficiency as 75.5, 81.4, and 59.1 % was obtained for the benzene-toluene-naphthalene-xylene (BTNX), benzene-toluene-ethylbenzene-xylene (BTEX), and benzene-toluene-naphthalene-p-nitrophenol (BTNp-NP) mixtures, respectively, at a 40-min pretreatment and optimum pH of 3.5. The biodegradability index was also observed in the favorable range of 0.4 to 0.5 after the pretreatment at optimum HO loading of 1.5 g L. Maximum COD removal efficiency of 99.2, 99.3, and 99.6 % was obtained using the biological oxidation treatment for 40 h for the case of BTNX, BTEX, and BTNp-NP mixtures, respectively. Analysis of kinetic models revealed that degradation followed three distinct stages based on fitting of the three-stage model and BPB was found to be more efficient as compared to the primary activated sludge (PAS) and modified activated sludge (MAS). Reusability studies confirmed that both IPB and BPB were effective over many cycles giving stable performance during degradation without leaching of Fe ions into the solution.

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Preparation and characterization of xerogel catalyst microspheres

Cited by 7 publications

References 14 publications

Development of alumina microspheres with controlled size and shape by vibrational droplet coagulation

Development of alumina microspheres with controlled size and shape by vibrational droplet coagulation

Toward a continuous synthesis of porous carbon xerogel beads

Improved treatment approach for the removal of aromatic compounds using polymeric beads in Fenton pretreatment and biological oxidation

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