Journal of Molecular Catalysis A Chemical

, том 333 , издание 1-2 , страницы 85-93

Study of acetaldehyde condensation chemistry over magnesia and zirconia supported on silica

Тип публикации: Journal Article

Дата публикации: 2010-12-01

Elsevier

Journal of Molecular Catalysis A Chemical

SJR: —

CiteScore: —

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ISSN: 13811169

DOI: 10.1016/j.molcata.2010.10.001

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Catalysis

Physical and Theoretical Chemistry

Process Chemistry and Technology

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Aldol condensation of acetaldehyde was investigated over silica supported magnesium and zirconium oxides. The acidic and basic properties of the catalysts were studied by TPD of NH 3 and CO 2 and IR spectroscopy of adsorbed pyridine and CO 2 . MgO/SiO 2 catalyst was characterized by high content of both basic and acidic sites, while ZrO 2 /SiO 2 contained mainly Lewis acid sites. All materials studied were shown to catalyze the aldol condensation of acetaldehyde with selectivity to crotonaldehyde of ca. 85%. The activity of the catalysts was found to be in the following order: ZrO 2 /SiO 2 > MgO/SiO 2 ≫ SiO 2 . To assess the role of acidic and basic sites in condensation reaction, pyridine and carbon dioxide were used as probe molecules for poisoning of the corresponding active sites during catalytic runs. The results pointed to the key role of Lewis acid sites in acetaldehyde condensation. A concerted mechanism involving Lewis and Bronsted acid sites of the catalysts is proposed on the basis of in situ IR spectroscopic studies.

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Ordomsky V. V., Sushkevich V. L., Ivanova I. I. Study of acetaldehyde condensation chemistry over magnesia and zirconia supported on silica // Journal of Molecular Catalysis A Chemical. 2010. Vol. 333. No. 1-2. pp. 85-93.

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TY - JOUR

DO - 10.1016/j.molcata.2010.10.001

UR - https://doi.org/10.1016/j.molcata.2010.10.001

TI - Study of acetaldehyde condensation chemistry over magnesia and zirconia supported on silica

T2 - Journal of Molecular Catalysis A Chemical

AU - Ordomsky, Vitaly V

AU - Sushkevich, Vitaly L

AU - Ivanova, Irina I

PY - 2010

DA - 2010/12/01

PB - Elsevier

SP - 85-93

IS - 1-2

VL - 333

SN - 1381-1169

ER -

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@article{2010_Ordomsky,

author = {Vitaly V Ordomsky and Vitaly L Sushkevich and Irina I Ivanova},

title = {Study of acetaldehyde condensation chemistry over magnesia and zirconia supported on silica},

journal = {Journal of Molecular Catalysis A Chemical},

year = {2010},

volume = {333},

publisher = {Elsevier},

month = {dec},

url = {https://doi.org/10.1016/j.molcata.2010.10.001},

number = {1-2},

pages = {85--93},

doi = {10.1016/j.molcata.2010.10.001}

}

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Ordomsky, Vitaly V., et al. “Study of acetaldehyde condensation chemistry over magnesia and zirconia supported on silica.” Journal of Molecular Catalysis A Chemical, vol. 333, no. 1-2, Dec. 2010, pp. 85-93. https://doi.org/10.1016/j.molcata.2010.10.001.

Издатель

Elsevier

Журнал

Journal of Molecular Catalysis A Chemical

SJR

—

CiteScore

—

Impact factor

—

ISSN

13811169 (Print)

Профили

Иванова Ирина Игоревна

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