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Wyszukujesz frazę "layered clays" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Selective catalytic reduction of NO,sub>x with ammonia (NH3-SCR) over transition metal-based catalysts -influence of the catalysts support
Autorzy:
Szymaszek, Agnieszka
Samojeden, Bogdan
Motak, Monika
Powiązania:
https://bibliotekanauki.pl/articles/109757.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
NH3-SCR
NOx
clinoptilolite
layered clays
iron
Opis:
Natural layered clays (bentonite and vermiculite) and natural zeolite (clinoptilolite) were tested and compared as the supports of the catalysts forselective catalytic reduction withammonia (NH3-SCR). The raw materials were modified in order to improve their catalytic properties. Layered clays were treated with HNO3 and intercalated with Al2O3 pillars to enhance their acidity, porosity and specific surface area. Clinoptilolite was ion-exchanged with NH4NO3 in order to increase the content of Brönsted acid sites, indispensablefor NH3 adsorptionduring the reaction. Subsequently, iron as an active phase was deposited on the modified supports by various methods, including incipient wetness impregnation, ion-exchange and co-precipitation. The efficiency of these methods was compared as NOx conversionobtained for each material. XRD analysis indicated that the initial modifications affected the structure of the raw aluminosilicates. FT-IR measurement confirmed the presence of characteristic Si-O and Al-O bonds and H2O molecules that occurnaturally in the materials. UV-Vis spectroscopy results indicated that different types of Fe species were deposited on the catalysts surface and theirform strongly depends on the type of the support. NH3-SCR catalytic tests showedthat all of the analyzed materials exhibitsatisfactory level of NO conversion and negligible concentration of by-product (N2O) in the exhaust gas. The highest catalytic activity (ca. 50% at 170°C and over 95% above 250°C) was obtained for Fe-Bent. The lowest concentration of N2O in the flue gas (less than 5 ppm in the whole temperature range) was observed for Fe-Clin.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1429-1441
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza ściśliwości warstwowanych iłów krakowieckich
Analysis of compressibility of layered Krakowiec Clays
Autorzy:
Wilk, K.
Powiązania:
https://bibliotekanauki.pl/articles/2075139.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
iły krakowieckie
warstwowa budowa gruntu
ściśliwość gruntu
osiadanie pali
Krakowiec clays
layered soil structure
soil compressibility
settlement of piles
Opis:
The substrate, whose compressibility has been analysed, served as subsoil for indirect foundations of bridges. A significant settlement of foundations was recorded while performing load tests. The results of the analysis indicate the specific structure of the Krakowiec Clays, as the cause of insufficient bearing capacity of piles. Small thickness of clay and silt layers prevents their separation, and certainly does not allow treating them as two soil types with different properties. The tested soil should be considered as a kind of natural composite, whose characteristics are unlikely to be "the resultant" of properties of constituent soils. Despite the high soil strength (very high values of strength parameters), the measured oedometer compression modules were significantly different from the standard attributed to this type of soils. The values of oedometer compression modules correspond with those prescribed by back analysis of settlement measured during the load test of piles. They were tested on natural undisturbed samples and on prepared samples of different humidities (from soil paste). The results were compared with those obtained by other researchers for soils of similar origin and alike physical properties.
Źródło:
Przegląd Geologiczny; 2014, 62, 5; 250--256
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
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