Thermal properties of pitch-polymer compositions and derived activated carbons

Activated carbons have been obtained by physical activation of residue left after supercritical extraction of hops. The effect of pyrolysis temperature on the physicochemical properties of the adsorbents prepared was tested. The carbonaceous materials were characterised by low-temperature nitrogen sorption, determination of pH and the number of surface oxygen groups. The thermal properties of the chars and activated carbons were identified by thermogravimetric analysis and differential thermogravimetry. The products of thermochemical treatment of the starting hops were carbonaceous adsorbents of specific surface area ranging from 2 to 416 m 2 g-1 , showing definitely basic character of the surface and moderate thermal stability as evidenced by a considerable mass loss at about 300-400°C. The results obtained in our study have proved that residue left after supercritical extraction of hops (or similar plant materials) can be cheap, easily accessible and promising precursor for activated carbons. The results have also shown that future research should be aimed at the optimum choice of the temperature of carbonation and activation in order to significantly improve the textural parameters of the activated carbons as well as their thermal stability.

Section: Introductionmentioning

confidence: 99%

Thermal analysis of activated carbon obtained from residue after supercritical extraction of hops

Bazan

Nowicki

Półrolniczak

et al. 2016

“…Amounts of resin added to pitch were chosen based on previous tests [11]. Minimum 25% of phenol-formaldehyde resin by mass added to the pitch caused distinct changes in main physical and chemical properties in relation to unmodified pitch [11,12]. Physical and chemical properties of the coal-tar pitch and pitch-phenol-formaldehyde resin composition are shown in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…Modification of coal-tar pitch with unsaturated polyester resins leads to considerable plasticization, and such modified bitumens of significantly lower cancerogenicity can be used as binders with insulating and sealing properties. The coal-tar pitch with the addition of poly (ethylene terephthalate) or polycarbonate is characterized by increased thermal and mechanical resistance [10], and it can be used as a promotor of porous materials of great specific surface [11][12][13]. Thermal factor played a decisive role in all examinations.…”

Section: Introductionmentioning

confidence: 99%

Thermo-rheological properties of coal-tar pitch modified with phenol-formaldehyde resin

Cieśińska

2017

Self Cite

Test results of changing the thermo-rheological properties of coal-tar pitch under influence of phenolformaldehyde resin are presented in this research work. Influence of modifying agent amount and crosslinking conditions (time) of resin in bitumen was evaluated. Tests were carried out using the rheometer in oscillation mode. They enabled the evaluation of changes in bitumen viscous and elastic properties and draw the conclusions about changes in bitumen structure on that basis. Compositions of the coal-tar pitch with phenol-formaldehyde resin show increased thermal and mechanical resistance. Furthermore, phenol-formaldehyde resin has an effect on increase in the coal-tar pitch viscosity. It probably results from the increased content of components of higher average molecular mass in the pitch and lower solubility in organic solvents.

“…Recently taken studies on the use of pitch-polymer compositions for the production of porous materials [4][5][6]. Modification of coal tar pitch with polymers influences also significantly its group components and properties.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties of group components of the pitch–PET compositions

Makomaski

Zieliński

2017

Self Cite

The study results of thermal properties of group components insoluble in quinoline and toluene of pitchpolymer compositions by differential scanning calorimetry, physicochemical and thermal properties, and structure of pitch-polymer compositions were presented. For pitchpolymer compositions containing 10-50 mass% waste polymer, softening point, coking value, content of components insoluble in toluene and quinoline, thermal analysis, and colloidal structure by fluorescence microscope were carried out.