Metode ekstrakcije brnistre ili žuke (Spartium Junceum L.)

Effects of different extraction methods of the Spanish Broom shoots were measured and compared with the purpose of obtaining composite material. The content of cellulose, lignin, pentosan and ash in the Spanish Broom fibers was determined. SEM analyses were performed.Mjereni su i uspoređeni učinci različitih postupaka maceracije izbojaka brnistre, radi upotrebe prirodnih vlakana u procesu dobivanja kompozitnih materijala. Uspoređeni su FTIR spektri nekih prirodnih vlakana, kao i FTIR spektri vlakana dobivenih različitim postupcima maceracije. U vlaknima brnistre određen je sadržaj celuloze, lignina, pentosana i pepela. Obavljene su SEM analize izbojka brnistre

Alumosilikatni spojevi zeolitnog tipa: sinteza, primjena i mogućnost stvaranja kompozita s celuloznim tekstilijama

Dan je pregled alumosilikatnih spojeva (zeolita), s naglaskom na sintetske, koji se koriste u svrhu dobivanja kompozitnih materijala u kojima je prisutan tekstil. Prikazani su postupci hidrotermalne sinteze alumosilikatnih mikroporoznih spojeva, odnosno mogućnosti dobivanja kompozitnih materijala celuloza - alumosilikat depozicijom zeolita na vlakna i tekstilne materijale, s posebnim osvrtom na mogućnosti primjene mikrovalnog zagrijavanja

Synthesis and characterization of Cu-MFI catalyst for the direct medium temperature range NO decomposition

Abstract In this study the physico-chemical and catalytic properties of copper bearing MFI zeolites (Cu-MFI) with different Si/Al and Si/Cu ratios were investigated. Two different methods for incorporation of metal ions into the zeolite framework were used: the ion exchange from the solution of copper acetate and the direct hydrothermal synthesis. Direct synthesis of a zeolite in the presence of copper-phosphate complexes was expected to generate more active copper species necessary for the desired reaction than the conventional ion exchange method. Direct decomposition of NO was used as a model reaction, because this reaction still offers a very attractive approach to NOX removal. The catalytic properties of zeolite samples were studied using techniques, such as XRD, SEM, EPR and nitrogen adsorption/desorption measurements at 77 K. Results of the kinetic investigation revealed that both methods are applicable for the preparation of the catalysts with active sites capable of catalyzing the NO decomposition. It was found out that Cu-MFI zeolites obtained through direct synthesis are promising catalysts for NO decomposition, especially at lower reaction temperatures. The efficiency of the catalysts prepared by both methods is compared and discussed

Extraction Methods of Spanish Broom (Spartium Junceum L.)

Effects of different extraction methods of the Spanish Broom shoots were measured and compared with the purpose of obtaining composite material. The content of cellulose, lignin, pentosan and ash in the Spanish Broom fibers was determined. SEM analyses were performed

Synthesis and characterization of Cu-MFI catalyst for the direct medium temperature range NO decomposition

Abstract In this study the physico-chemical and catalytic properties of copper bearing MFI zeolites (Cu-MFI) with different Si/Al and Si/Cu ratios were investigated. Two different methods for incorporation of metal ions into the zeolite framework were used: the ion exchange from the solution of copper acetate and the direct hydrothermal synthesis. Direct synthesis of a zeolite in the presence of copper-phosphate complexes was expected to generate more active copper species necessary for the desired reaction than the conventional ion exchange method. Direct decomposition of NO was used as a model reaction, because this reaction still offers a very attractive approach to NOX removal. The catalytic properties of zeolite samples were studied using techniques, such as XRD, SEM, EPR and nitrogen adsorption/desorption measurements at 77 K. Results of the kinetic investigation revealed that both methods are applicable for the preparation of the catalysts with active sites capable of catalyzing the NO decomposition. It was found out that Cu-MFI zeolites obtained through direct synthesis are promising catalysts for NO decomposition, especially at lower reaction temperatures. The efficiency of the catalysts prepared by both methods is compared and discussed