Effect of mono- and divalent extra-framework cations on the structure and accessibility of porosity in chabazite zeolites

The differences in valence and size between extra-framework cations exert a significant effect on the nitrogen sorption ability in the synthesised chabazite zeolites (K-CHA, Cs-CHA, Ca-CHA, Ba-CHA, Sr-CHA and Zn-CHA).

Well-Dispersed Te-Doped Mesoporous Carbons as Pt-Free Counter Electrode for High-Performance Dye-Sensitized Solar Cells

Tellurium-doped carbon nanomaterial (Te-MC(P)) was newly developed by the soft-templated carbonization of PAN-b-PBA copolymer with poly(3-hexyltellurophene). The Te-MC(P) was characterized with various characterizations, including the nitrogen sorption isotherms measurement (BET),...

Influence of Acid-Treatment on Waste Lignin for Synthesis of Carbon Nanoparticle

Waste lignin (WL) obtained from paper mills, was studied for its potential application in preparing carbon nanoparticles (CNPs) with high porosity. This was done by impregnation of 0, 5, 10 and 20% concentrations of phosphoric acid under various carbonization temperatures (600, 700, 800 and 900°C). The physicochemical properties of CNPs were characterized through nitrogen sorption, X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Fourier transforms infrared spectroscopy (FTIR). Nitrogen sorption revealed that the condition using 10% concentration of phosphoric acid treatment at a carbonization temperature of 700°C formed carbon nanoparticles with a highly porous structure (Surface area 27.65 m2/g and pore volume 0.07 cm3/g). Additionally, in order to high surface area, porosity and concentrated carbon nanoparticle.

The application of modified cenospheres in DeNOx process

Cenospheres were modified with iron, manganese and/or copper ions by the hydrotalcite method. The obtained catalysts were characterized by FTIR, XRD and low-temperature nitrogen sorption. The best catalyst at low temperature (200 °C) was CBFe-Mn while at the highest measured temperature of 500 °C both CBFe-Mn and CBMn-Cu showed similar performance.

Structural Property Improvements of Bentonite with Sulfuric Acid Activation and a Test in Catalytic Wet Peroxide Oxidation of Phenol

The acid activation of bentonite from Middle Anatolia, consisting of mostly montmorillonite, with a hot solution of H2SO4 with different concentrations was carried out. SEM images, nitrogen sorption isotherms and FTIR spectra were used to examine structural changes of the bentonite with acid activation. Acid–base titration method was applied to determine surface acidities. SEM images, nitrogen sorption isotherms indicated that the acid activation caused considerable increases both in the surface area and pore volumes by changing the morphology and aluminum content. FTIR spectra showed the enhancement both in Lewis and Brønsted acidities, significant increases in H–bonding to the structure with acid concentration. Acid treatment gave good structural properties with high surface acidity. Stable structured acid activated bentonite with 2 M was tested in catalytic wet peroxide oxidation (CWPO) of phenol together with raw bentonite. Around 96 % phenol removal was achieved in 135 minutes at reaction temperature of 50 °C while the raw bentonite did not show good results. The data were in agreement with the first order dependency with respect to phenol.