Search Results

You are looking at 1 - 4 of 4 items for :

  • Substances and Products x
Clear All
Open access

K. Bohács, J. Faitli, L. Bokányi and G. Mucsi

REFERENCES [1] J. Xie, S. Kaliaguine, Zeolite ball milling as a means of enhancing the selectivity for base catalyzed reactions 148 , 415-423 (1997). [2] P.A. Zielinski, A. Van Neste, D.B. Akolekar, S. Kaliaguine, Effect of high-energy ball milling on the structural stability, surface and catalytic properties of small-, medium- and large-pore zeolites, Microporous Mater. 5 , 123-133 (1995). [3] K. Akçay, A. Sirkecioğlu, M. Tatlıer, Ö.T. Savaşçı, A. Erdem-Şenatalar, Wet ball milling of zeolite HY, Powder Technol. 142 , 121-128 (2004). [4

Open access

I. Kuźniarska-Biernacka, M.A. Carvalho, I. Correia Neves, A. M. Fonseca, A. Lisińska-Czekaj and D. Czekaj

Abstract

The copper(II) complex with a Schiff-base salen-type ligand has been encapsulated in the nanopores of a NaY zeolite by using two different methodologies, the flexible ligand and in situ complex preparation methods. The encapsulated and non-encapsulated copper(II) complexes were screened as catalysts for styrene oxidation by using TBHP as the oxygen source in acetonitrile solvent. Under the optimized conditions, the catalysts exhibited moderate activity with higher selectivity to benzaldehyde. Both heterogeneous catalysts were found to be reusable after the catalytic cycle, but with some loss of activity

Open access

I. Kuźniarska-Biernacka, A. Lisinska-Czekaj, D. Czekaj, M. José Alves, A. Mauricio Fonseca and I. Correia Neves

Abstract

The manganes(III) complex functionalised with 2,3-dihydropyridazine has been encapsulated in the supercages of the NaY zeolite using two different procedures, flexible ligand and in situ complex. The parent zeolite and the encapsulated manganese(III) complexes were screened as catalysts for styrene oxidation by using t-BOOH as the oxygen source in acetonitrile. Under the optimized conditions, the catalysts exhibited moderate activity with high selectivity to benzaldehyde

Open access

Y. Nishizaki, H. Miyamae, S. Ichikawa, K. Izumiya, T. Takano, N. Kumagai and K. Hashimoto

Our effort for decontamination of radioactive cesium scattered widely by nuclear accident in March 2011 in Fukushima, Japan has been described. Radioactive cesium scattered widely in Japan has been accumulating in arc or plasma molten-solidified ash in waste incinerating facilities up to 90,000 Bq/kg of the radioactive waste. Water rinsing of the ash resulted in dissolution of cesium ions together with high concentrations of potassium and sodium ions. Although potassium inhibits the adsorption of cesium on zeolite, we succeeded to precipitate cesium by in-situ formation of ferric ferrocyanide and iron rust in the radioactive filtrate after rinsing of the radioactive ash with water. Because the regulation of no preservation of any kind of cyanide substances, cesium was separated from the precipitate consisting of cesium-captured ferric ferrocyanide and ferric hydroxide in diluted NaOH solution and subsequent filtration gave rise to the potassium-free radioactive filtrate. Cesium was captured by zeolite from the potassium-free radioactive filtrate. The amount of this final radioactive waste of zeolite was significantly lower than that of the arc-molten-solidified ash.