Synthesis of nano-crystalline NiFe2O4 powders in subcritical and supercritical ethanol

Ćosović, Aleksandar; Žák, T.; Glišić, Sandra B.; Sokić, Miroslav; Lazarević, Slavica; Ćosović, Vladan; Orlović, Aleksandar M.

doi:10.1016/j.supflu.2016.03.014

Cited by 11 publications

(1 citation statement)

References 42 publications

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“…Supercritical drying in excess of solvent Catalyst support, prepared by previously described procedure, was transferred to the pressure vessel (Autoclave Engineers BTRS-Jr, Division of Snap-title, Inc., Erie, PA, USA) and the vessel was filled with additional 170 ml of ethanol. Such a procedure was necessary to ensure that the pores in the obtained material were always filled with single phase ethanol (liquid, supercritical or gas) thereby avoiding formation of the two phase region (liquid-gas) in the pores [46,47,48]. The vessel was then sealed and heated (heating rate 3.3 C˚/min, total time of heating was 70 min) to the desired temperature and pressure of 100 bars and 528 K. Upon the reaction completion, after half an hour, the system was depressurized to atmospheric pressure followed by gradual temperature decrease to ambient conditions.…”

Section: Preparation Of the Catalyst Supportsmentioning

confidence: 99%

Impact of supercritical drying with excess solvent on textural properties of Ti-HMS catalyst support

Prokić-Vidojević¹,

Glišić²,

Orlović³

2017

Sci Tech Rev

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Textural characteristics of catalysts and catalysts supports are of a prime importance when it comes to their application in processing of high molecular weight compounds. Drying procedure is a key factor in preservation of wet gel properties. Hexagonal mesoporous silicas (HMS) doped with Ti-ions is finding a promising usage as heterogeneous catalysts support. In this paper, the effect of supercritical drying with excess solvent on the textural characteristics of Ti-HMS is addressed. HMS with Ti ions (Si/Ti atomic ratio of 40) is prepared using the sol-gel method. Dodecylamine is used as the structure directing surfactant (S) and TEOS and Titanium butoxide as the inorganic precursors (I). Specific surface area, mesoporosity and pore volume of the support dried by thermal evaporation of solvent in air and dried in excess of supercritical ethanol are compared. The results indicate that improved specific surface area and almost four times bigger value for mesopore volume are obtained using supercritical drying procedure.

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Section: Preparation Of the Catalyst Supportsmentioning

confidence: 99%