Aluminum Oxide and Systems Based on It: Properties and Applications Full article
Journal |
Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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Output data | Year: 2012, Volume: 53, Number: 4, Pages: 425-439 Pages count : 15 DOI: 10.1134/S0023158412040039 | ||
Tags | Palladium; Aluminum Hydroxide; Boehmite; Temperature Program Reduction; Bismuth Oxide | ||
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Abstract:
The metastable forms of aluminum oxide that exist in the range of 300–800°C are characterized;
differences in the microstructures of homogeneous γ, η, and χAl2O3 are demonstrated; and the acid–base
properties of the above modifications are compared. The catalytic properties of aluminum oxide in ethanol
dehydration and propionitrile ammonolysis were studied. It was found that an increased surface concentra
tion of Lewis acid sites, including strong acid sites (ν(CO) = 2237 cm–1), is required for preparing an effective
catalyst for the dehydration of ethanol, whereas the rate of propionitrile conversion increased proportionally
to the surface concentration of Brønsted acid sites. γAluminum oxide was used to prepare catalysts for car
bon monoxide oxidation. It was found that the supporting of Pd on γAl2O3 did not change the support struc
ture. Palladium on the surface of γAl2O3550 (Tcalcin = 550°C, SBET = 300 m2/g) occurred as single particles (2–3 nm) and aggregates (~100 nm). The single particles were almost completely covered with a layer of alu
minum oxide to form core–shell structures. According to XPS data, they were in atypical states (BE(Pd 3d5/2) =
336.0 and 338.0 eV), which were not reduced by hydrogen in the range of 15–450°C and were resistant to the
action of the reaction mixture. Palladium on the surface of γAl2O3800 (SBET = 160 m2/g) was in the states Pd0 and PdO, which are typical of Pd/Al2O3, and the proportions of these states can change under the action of the reaction mixture. An increase in the Tcalcin of the Pd/Al2O3(800)450 catalyst from 450 to 800 → 1000 → 1200°C led to the agglomeration of palladium particles and to an increase in the temperature of 50% CO conversion from 145 to 152 → 169 → 189°C, respectively. αAluminum oxide was used in the preparation of an effective Mn–Bi–O/αAl2O3 supported catalyst for the synthesis of nitrous oxide by the oxidation of ammonia with oxygen: the NH3 conversion was 95–97% at 84.4% N2O selectivity.
Cite:
Ivanova A.S.
Aluminum Oxide and Systems Based on It: Properties and Applications
Kinetics and Catalysis. 2012. V.53. N4. P.425-439. DOI: 10.1134/S0023158412040039 WOS Scopus РИНЦ
Aluminum Oxide and Systems Based on It: Properties and Applications
Kinetics and Catalysis. 2012. V.53. N4. P.425-439. DOI: 10.1134/S0023158412040039 WOS Scopus РИНЦ
Original:
Иванова А.С.
Оксид алюминия и системы на его основе: свойства, применение
Кинетика и катализ. 2012. Т.53. №4. С.446-460. РИНЦ
Оксид алюминия и системы на его основе: свойства, применение
Кинетика и катализ. 2012. Т.53. №4. С.446-460. РИНЦ
Dates:
Submitted: | Dec 21, 2011 |
Published print: | Jul 1, 2012 |
Published online: | Jul 26, 2012 |
Identifiers:
Web of science | WOS:000306798100001 |
Scopus | 2-s2.0-84865606164 |
Elibrary | 20472984 |
Chemical Abstracts | 2012:1083969 |
Chemical Abstracts (print) | 157:551139 |
OpenAlex | W1968256617 |