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  1. Article: Body weight, morphometric measurements and number of teats of Boer goat does, reared in Bulgaria

    Panayotov, Dimitar

    Bulgarian journal of agricultural science

    2022  Volume 28, Issue 2, Page(s) 331

    Document type Article
    ZDB-ID 1306706-0
    ISSN 1310-0351
    Database Current Contents Nutrition, Environment, Agriculture

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    In stock of ZB MED Bonn / Germany

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  2. Article: Study on chemical composition, fatty acid composition and technological quality of meat in Boer goat kids

    Panayotov, Dimitar

    Bulgarian journal of agricultural science

    2021  Volume 27, Issue 6, Page(s) 1248

    Document type Article
    ZDB-ID 1306706-0
    ISSN 1310-0351
    Database Current Contents Nutrition, Environment, Agriculture

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    In stock of ZB MED Bonn / Germany

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  3. Article: Study on carcass characteristics in Boer goat kids

    Panayotov, Dimitar

    Bulgarian journal of agricultural science

    2021  Volume 27, Issue 6, Page(s) 1212

    Document type Article
    ZDB-ID 1306706-0
    ISSN 1310-0351
    Database Current Contents Nutrition, Environment, Agriculture

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    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 6253: Show issues

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  4. Article ; Online: Capturing CO

    Panayotov, D / Zdravkova, V / Lagunov, O / Andonova, S / Spassova, I / Nihtianova, D / Atanasova, G / Drenchev, N / Ivanova, E / Mihaylov, M / Hadjiivanov, K

    Physical chemistry chemical physics : PCCP

    2023  Volume 25, Issue 26, Page(s) 17154–17175

    Abstract: Ceria and ceria-zirconia nanomaterials of different origin were studied in order to elucidate the role of their structural and textural characteristics in controlling the performance towards ... ...

    Abstract Ceria and ceria-zirconia nanomaterials of different origin were studied in order to elucidate the role of their structural and textural characteristics in controlling the performance towards CO
    Language English
    Publishing date 2023-07-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d3cp00896g
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Infestation with protostrongylids of the Balkan chamois (Rupicapra rupicapra balcánica, Bolkey 1925) in Rila National Park, Bulgaria: preliminary data

    Yankov, Y. / Georgiev, D. / Iliev, P. / Tonev, A. / Arangelov, S. / Valchev, K. / Panayotov, D. / Peeva, S.

    Bulgarian journal of agricultural science

    2022  Volume 28, Issue 3, Page(s) 521

    Document type Article
    ZDB-ID 1306706-0
    ISSN 1310-0351
    Database Current Contents Nutrition, Environment, Agriculture

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    Kategorien

    In stock of ZB MED Bonn / Germany

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  6. Article: Blood biochemical profile as an objective measure of welfare in Lacaune sheep

    Nedeva, Ivelina / Slavov, Todor / Radev, Veselin / Panayotov, Dimitar / Varlyakov, Ivan

    Bulgarian journal of agricultural science

    2022  Volume 28, Issue 2, Page(s) 324

    Document type Article
    ZDB-ID 1306706-0
    ISSN 1310-0351
    Database Current Contents Nutrition, Environment, Agriculture

    More links

    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 6253: Show issues

    Order via subito

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  7. Article ; Online: Spectral evidence for hydrogen-induced reversible segregation of CO adsorbed on titania-supported rhodium.

    Panayotov, D / Mihaylov, M / Nihtianova, D / Spassov, T / Hadjiivanov, K

    Physical chemistry chemical physics : PCCP

    2014  Volume 16, Issue 26, Page(s) 13136–13144

    Abstract: The reduction of a 1.3% Rh/TiO2 sample with carbon monoxide leads to the formation of uniform Rh nanoparticles with a mean diameter of dp ≈ 2.2 nm. Adsorption of CO on the reduced Rh/TiO2 produces linear and bridged carbonyls bound to metallic Rh(0) ... ...

    Abstract The reduction of a 1.3% Rh/TiO2 sample with carbon monoxide leads to the formation of uniform Rh nanoparticles with a mean diameter of dp ≈ 2.2 nm. Adsorption of CO on the reduced Rh/TiO2 produces linear and bridged carbonyls bound to metallic Rh(0) sites and only a few geminal dicarbonyls of Rh(I). The ν(CO) of linear Rh(0)-CO complexes is strongly coverage dependent: it is observed at 2078 cm(-1) at full coverage and at ca. 2025 cm(-1) at approximated zero coverage. At low coverage, this shift is mainly caused by a dipole-dipole interaction between the adsorbed CO molecules while at high coverage, the chemical shift also becomes important. Hydrogen hardly affects the CO adlayer at high CO coverages. However, on a partially CO-covered surface (θCO ≈ 0.5), the adsorption of H2 at increasing pressure leads to a gradual shift in the band of linear Rh(0)-CO from 2041 to 2062 cm(-1). Subsequent evacuation almost restores the original spectrum, demonstrating the reversibility of the hydrogen effect. Through the use of (12)CO + (13)CO isotopic mixtures, it is established that the addition of hydrogen to the CO-Rh/TiO2 system leads to an increase in the dynamic interaction between the adsorbed CO molecules. This evidences an increase in the density of the adsorbed CO molecules and indicates segregation of the CO and hydrogen adlayers. When CO is adsorbed on a hydrogen-precovered surface, the carbonyl band maximum is practically coverage independent and is observed at 2175-2173 cm(-1). These results are explained by a model according to which CO successively occupies different rhodium nanoparticles.
    Language English
    Publishing date 2014-07-14
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/c4cp01136h
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Hydrogen spillover on Rh/TiO2: the FTIR study of donated electrons, co-adsorbed CO and H/D exchange.

    Panayotov, D / Ivanova, E / Mihaylov, M / Chakarova, K / Spassov, T / Hadjiivanov, K

    Physical chemistry chemical physics : PCCP

    2015  Volume 17, Issue 32, Page(s) 20563–20573

    Abstract: Hydrogen dissociation and spillover on supported metal nanoparticles have received renewed interest because these chemical processes are closely related to applications in heterogeneous catalysis and hydrogen storage. In heterogeneous catalysis, ... ...

    Abstract Hydrogen dissociation and spillover on supported metal nanoparticles have received renewed interest because these chemical processes are closely related to applications in heterogeneous catalysis and hydrogen storage. In heterogeneous catalysis, spillover can control the reaction rate and selectivity of a wide range of reactions, e.g. hydrogenation, synthesis of methanol and hydroisomerization. In this work, we combine three spectroscopic approaches, i.e. the FT-IR spectroscopy of donated electrons, co-adsorbed CO and H/D exchange, to obtain detailed information on the dynamics of hydrogen interaction with a model 1.3% Rh/TiO2 catalyst. Our spectroscopic results helped us to build a physical picture of the processes occurring during the H-spillover on Rh/TiO2. It was found that molecular H2 dissociates on nanocrystalline Rh; H atoms spillover onto the titania thus protonating the semiconductor, while donating electrons to shallow trap (ST) states and the conduction band (CB) of TiO2. These donated electrons are observed by their specific IR features. By simultaneously monitoring the changes in the vibrational modes of CO, and, the infrared absorbance due to transitions involving CB and ST electrons, we found that both CO-reduced and partially re-oxidized Rh nanocrystallites promote the H-spillover and thus the n-doping of TiO2 materials. Upon evacuation, the process reverses: hydrogen atoms spillover back to Rh nanoparticles where they recombine to form H2 molecules that desorb from the surface. These new mechanistic insights into the process of H2 dissociation and spillover on the powder Rh/TiO2 catalyst call for further model surface science studies with model metal nanoparticle-single crystal substrate systems, in which a detailed picture of energetics and spatial distribution of hydrogen and injected electrons could be obtained.
    Language English
    Publishing date 2015-08-28
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/c5cp03148f
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Live weight and intensity of growth of lambs from Lacaune breed raised in Bulgaria

    Panayotov, Dimitar / Sevov, S. / Georgiev, D.

    Bulgarian journal of agricultural science

    2018  Volume 24, Issue Suppl.1, Page(s) 88

    Document type Article
    ZDB-ID 1306706-0
    ISSN 1310-0351
    Database Current Contents Nutrition, Environment, Agriculture

    More links

    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 6253: Show issues

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  10. Article: Physico-chemical and technological characteristics of Lacaune ewe's milk

    Panayotov, Dimitar / Naydenova, Nikolina / Mihaylova, Gyurga / Iliev, Todor

    Bulgarian journal of agricultural science

    2018  Volume 24, Issue Suppl.1, Page(s) 101

    Document type Article
    ZDB-ID 1306706-0
    ISSN 1310-0351
    Database Current Contents Nutrition, Environment, Agriculture

    More links

    Kategorien

    In stock of ZB MED Bonn / Germany

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    Order via subito

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