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Nitric oxide(NO) decomposition on catalysts, containing oxides of lanthanum and cerium, supported on γ-alumina

Journal of Rare Earths 2019年第2期37卷 151-159页

作者： d.stoyanova P.Georgieva I.Avramova K.Aleksieva d.Marinova d.Mehandjiev Institute of General and Inorganic Chemistry-BAS Institute of Catalysis-BAS

The present work was devoted to study the catalytic activity of lanthanum and cerium oxides separately,deposited on g-alumina in the reaction of decomposition of nitric oxide. The catalyst samples were prepared by the method of impregnation of g-Al_2 O_3 using solutions, containing nitrates of lanthanum and cerium. The prepared samples were calcined for 4 h at temperature 650℃ in an oven in air atmosphere. The catalysts were characterized by: chemical analysis by inductively coupled plasma atomic emission spectrometry(ICP-AES), X-ray diffraction(XRd), X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM) combined with energy-dispersive X-ray spectroscopy(EdS), electron paramagnetic resonance(EPR) and infrared(IR) spectroscopy, as well as measurement of the specific surface area. The results show that the catalysts based on lanthanum oxide and cerium oxide deposited on alumina display high catalytic activity over 60% conversion degree with respect to decomposition of nitric oxide in the absence of reducing agent. In the presence of reducer the activity reaches 90% conversion degree.

关键词： Rare earths Catalysts Catalytic activity decomposition of nitric oxide

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Seed Protein Electrophoresis for Assessment of Genetic diversity among Festuca pratensis Huds, Local Ecotypes

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Journal of Agricultural Science and Technology(B) 2011年第8期1卷 1176-1183页

作者： S. d. stoyanova B. Boller Y. K. Guteva S. A. Angelova Institute of Plant Genetic Resources Druzhba str.2 Sadovo 4122 Bulgaria Agroscope Reckenholz-Tginikon Research Station ART Reckenholzstr. 191 Zurich 8046 Switzerland

Fifty two accessions of Festuca pratensis Huds. were analysed of which 18 had been collected in Switzerland and 32 in Bulgaria. SdS-PAGE of seed proteins was implemented to detect genetic variation among ecotype populations using a modification of UPOV method for barley. The modification concerns mainly protein extracting procedure as detailed described in the protocol. The two cultivars Preval and Cosmolit were used as standards. Cluster analyses and correspondence analyses/scatter plot were used as statistic approaches for determining genetic diversity among individual ecotypes and groups of ecotypes. Electrophoretic spectra of proteins show clear differences among local accessions in relation to their origin. In Swiss ecotypes 32 protein fragments were determined whereas in Bulgarian local populations their number was 68. Each of the two eco-groups possesses fragments that appear in all accessions of the group. The number of monomorphic bands within Bulgarian local ecotypes is four whereas their number in Swiss ecotypes is 12. Four monomorphic bands appearing in all proteinograms no difference of eco-groups was identified with Rm values of： 0.43, 0.55, 0.58, 0.82. A higher level of protein band polymorphism was proven in Bulgarian ecotypes in comparison with Swiss ecotypes. Thirty seven polymorphic bands occurred exclusively in the Bulgarian local ecotypes and had a frequency of 0.03 or higher whereas within Swiss ecotypes was detected one unique protein fragment. SdS-PAGE ＂fingerprinting＂ is suggested as a fast and easy approach to differentiate F. pratensis ecotypes by their origin as well for detection of foreign germplasm for inclusion in breeding programs.

关键词： Festuca pratensis electrophoresis seed identification diversity.

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