Investigation on the Low-Temperature Transformations of Poly(furfuryl alcohol) Deposited on MCM-41

Abstract

MCM-41-type mesoporous silica was used as a support for poly(furfuryl alcohol) deposition. This material was produced by precipitation-polycondensation of furfuryl alcohol (FA) in aqueous slurry of the SiO 2 support followed by controlled partial carbonization. By tuning the FA/MCM-41 mass ratio in the reaction mixture, various amounts of polymer particles were introduced on the inner and outer surface of the MCM support. The thermal decomposition of the PFA/MCM-41 composites was studied by thermogravimetry (TG) and spectroscopic techniques (DRIFT, XPS), whereas the evolution of textural parameters with increasing polymer content was investigated using low-temperature adsorption of nitrogen. The mechanism of thermal transformations of PFA deposited on the MCM-41 surface was discussed in detail. It was found that heating at a temperature of about 523 K resulted in opening of the furan rings and the formation of γ-diketone moieties, which were found to be * Corresponding author. Tel. +48-12-6632006; fax +48-12-6340515. E-mail address: kustrows@chemia.uj.edu.pl 2 the highest effective surface species for the adsorption of polar volatile organic compounds. A further increase in calcination temperature caused a drop in the amounts of surface carbonyls and the appearance of condensed aromatic domains.

Influence of thermal treatment conditions on efficiency of PFA/MCM-48 composite and CMK-1 carbon replica in adsorption of volatile organic compounds

“…The adsorption capacities were calculated from the TPD profiles after their integration. [44,45]. The carbon contents in the studied materials are 1.7 and 29.4 %, respectively, and perfectly correspond to the calculated PFA/MCM-48 mass ratios.…”

“…mesoporous silica) [42]. For this purpose, polyacrylonitrile (PAN) and poly(furfuryl alcohol) (PFA) have been mainly used due to their high carbon content and thermal stability [43][44][45]. The highest adsorption capacity in the elimination of ketones from the gas phase was achieved for mesoporous silica decorated with small amounts of PFA pyrolysed at 250°C.…”

A simplified route to the synthesis of CMK-3 replica based on precipitation polycondensation of furfuryl alcohol in SBA-15 pore system

“…The appearance of oxygen-containing groups on the surface of carbonized sample should be connected with the mechanism of decomposition of PFA supported on mesoporous silica and reoxidation of PFA-derived carbonizate. It has been shown that SiO 2 -deposited PFA undergoes structural transformation including some steps such as: opening the furan ring with the formation of γ-diketone moieties and subsequent deeper carbonization resulting in the appearance of higher condensed polyunsaturated graphite-like species containing oxygen groups [29,38]. A part of these functionalities can be stable under carbonization conditions (850ºC, 4 h).…”

Elimination of ketone vapors by adsorption on spherical MCM-41 and MCM-48 silicas decorated with thermally activated poly(furfuryl alcohol)

“…Adsorption of gaseous hydrocarbons can easily be improved by covering of silica surface by partially carbonized polymer film [17]. For this purpose, polyacrylonitrile (PAN) and poly(furfuryl alcohol) (PFA) are mainly investigated due to the high carbon content and thermal stability [18,19].…”

“…Our previous studies [19] on the adsorption of methyl-ethyl ketone (MEK) vapor on thermally degraded PFA deposited on the MCM-41 silica surface exhibited that the highest adsorption capacity was achieved for the absorbents with low PFA loadings. On the other hand, it was found that calcination temperature played a crucial role in tuning the adsorption properties.…”