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10-O-04 - Site selective adsorption and catalytic properties of iron in FER and BEA zeolites
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10-O-02 - Ion exchange of alkali metals and control of acidic/basic properties of MCM-22 and MCM-36 J.-O. Barth, R. Schenkel, J. Kornatowski and J.A. Lercher
Technische Universitdt Mfmchen, Lehrstuhl Il fi~r Technische Chemie, Munich, Germany jan-olaf barth@ch, tum. de MCM-22 (Si/AI = 12) and MCM-36 pillared with SiO2 (Si/AI = 29) were modified by ion exchange of alkali cations. A critical point was the pH of the solution, which should be adjusted to about 9 and 4, respectively. At pH 9 the pillared mesoporous structure of MCM36 was destroyed as indicated by nearly amorphous XRD patterns and severely reduced BET surface areas. The degree of exchange decreased from Na to Cs (except the lowest value for Li). In spite of this, the basic character in both series increased from Li to Cs as demonstrated by IR spectra of adsorbed pyridine and TPD of ammonia.
10-O-03 - Insertion compounds of metal halides with porosils: "Structured Gases" P. Behrens (a), M. Hartl (a), G. Wirnsberger (b), A. Popitsch (b) and B. Pillep (c)
a) Institut fiir Anorganische Chemie, Universitat Hannover, Hannover, Germany," Peter.Behrens@ mbox.acb.uni-hannover.de; b) Institut ffir Physikalische und Theoretische Chemie, Technische Universitdt Graz, Austria; c) Patent- und Rechtsanwaltskanzlei Kador & Partner, Mfinchen, Germany Insertion compounds of porosils with mercury(II) halides HgX2 (X: C1, Br, I) and with gold(Ill) chloride were synthesized and characterized by a variety of analytical techniques. Due to the electroneutral character of the pure SiO2 framework of the porosil hosts, host-guest interactions are restricted to weak forces of the van der Waals-type. The compounds contain isolated HgX2 molecules or Au2C16 dimer molecules, respectively. These molecules have properties that are very similar to the corresponding molecules in the gaseous state.
10-O-04 - Site selective adsorption and catalytic properties of iron in FER and BEA zeolites Z. Sobalik, J.E. ~;poner, Z. Tvarfl~kov/t, A. Vondrov~i, S. Kuriyavar and B. Wichterlovfi
J. Heyrovsk~ Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejgkova 3, CZ-182 23 Prague 8, Czech Republic- Sobalik@l'h-inst.cas.cz FTIR spectroscopy, interaction with oxygen, NO, N20, catalytic oxidation of NO to NO2, and reduction of NOx with propane have been used to characterise Fe cations in FER and BEA zeolites. Three cationic positions for Fe ions in dehydrated samples of Fe-FER, and one in FeBEA have been identified. A complex nature of the reversible interaction of the Fe(II) cations in FER and BEA with 02, NO, N20 has been described. The experimental study is complemented with a simple theorical investigation of Fe(II) and Fe(III) coordination over the most populated 13 site.
10-O-02 - Ion exchange of alkali metals and control of acidic/basic properties of MCM-22 and MCM-36 J.-O. Barth, R. Schenkel, J. Kornatowski and J.A. Lercher
Technische Universitdt Mfmchen, Lehrstuhl Il fi~r Technische Chemie, Munich, Germany jan-olaf barth@ch, tum. de MCM-22 (Si/AI = 12) and MCM-36 pillared with SiO2 (Si/AI = 29) were modified by ion exchange of alkali cations. A critical point was the pH of the solution, which should be adjusted to about 9 and 4, respectively. At pH 9 the pillared mesoporous structure of MCM36 was destroyed as indicated by nearly amorphous XRD patterns and severely reduced BET surface areas. The degree of exchange decreased from Na to Cs (except the lowest value for Li). In spite of this, the basic character in both series increased from Li to Cs as demonstrated by IR spectra of adsorbed pyridine and TPD of ammonia.
10-O-03 - Insertion compounds of metal halides with porosils: "Structured Gases" P. Behrens (a), M. Hartl (a), G. Wirnsberger (b), A. Popitsch (b) and B. Pillep (c)
a) Institut fiir Anorganische Chemie, Universitat Hannover, Hannover, Germany," Peter.Behrens@ mbox.acb.uni-hannover.de; b) Institut ffir Physikalische und Theoretische Chemie, Technische Universitdt Graz, Austria; c) Patent- und Rechtsanwaltskanzlei Kador & Partner, Mfinchen, Germany Insertion compounds of porosils with mercury(II) halides HgX2 (X: C1, Br, I) and with gold(Ill) chloride were synthesized and characterized by a variety of analytical techniques. Due to the electroneutral character of the pure SiO2 framework of the porosil hosts, host-guest interactions are restricted to weak forces of the van der Waals-type. The compounds contain isolated HgX2 molecules or Au2C16 dimer molecules, respectively. These molecules have properties that are very similar to the corresponding molecules in the gaseous state.
10-O-04 - Site selective adsorption and catalytic properties of iron in FER and BEA zeolites Z. Sobalik, J.E. ~;poner, Z. Tvarfl~kov/t, A. Vondrov~i, S. Kuriyavar and B. Wichterlovfi
J. Heyrovsk~ Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejgkova 3, CZ-182 23 Prague 8, Czech Republic- Sobalik@l'h-inst.cas.cz FTIR spectroscopy, interaction with oxygen, NO, N20, catalytic oxidation of NO to NO2, and reduction of NOx with propane have been used to characterise Fe cations in FER and BEA zeolites. Three cationic positions for Fe ions in dehydrated samples of Fe-FER, and one in FeBEA have been identified. A complex nature of the reversible interaction of the Fe(II) cations in FER and BEA with 02, NO, N20 has been described. The experimental study is complemented with a simple theorical investigation of Fe(II) and Fe(III) coordination over the most populated 13 site.