Publikace detail

Comparative study of physico-chemical properties of laboratory and industrially prepared layered double hydroxides and their behavior in aldol condensation of furfural and acetone

Autoři: Hora Lukáš | Kikhtyanin Oleg | Čapek Libor | Bortnovskiy Oleg | Kubička David

Rok: 2015

Druh publikace: článek v odborném periodiku

Název zdroje: Catalysis Today

Název nakladatele: Elsevier Science BV

Místo vydání: Amsterdam

Strana od-do: 221-230

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Srovnávací studie fyzikálně-chemických vlastností laboratorně a průmyslově vyrobených hydrotalcitů a jejich chování v aldol kondenzaci furfuralu a acetonu	V tomto článku byly srovnávány vlastnosti laboratorně a průmyslově vyrobených Mg-Al hydrotalcitů s různým molárním poměrem Mg/Al v rozsahu od 2 do 4. Fyzikálně-chemické vlastnosti studovaných materiálů byly koumány s využitím XRD, SEM, N2 fyzisorpce, TGA a CO2-TPD.	aldol kondenzace; hydrotalcity; furfural; aceton
eng	Comparative study of physico-chemical properties of laboratory and industrially prepared layered double hydroxides and their behavior in aldol condensation of furfural and acetone	In this article, properties of laboratory and industrially prepared Mg-Al layered double hydroxides (LDH) with Mg:Al molar ratios varied in the range from 2 to 4 were compared. Physico-chemical properties of the studied materials were investigated with XRD, SEM, N-2 physisorption, TGA and CO2-TPD methods. Catalytic behavior of the LDH samples was examined in the liquid phase aldol condensation of furfural and acetone at 20 and 60 degrees C. It was found that LDH from the small-scale preparation have different physicochemical characteristics than the LDH materials originating from the large-scale (industrial) preparation which is also reflected in their catalytic behavior. As-synthesized laboratory LDH catalysts are phasepure crystalline samples with hydrotalcite structure while the industrial materials also possess MgO as admixture. The laboratory samples possess larger BET surface area and mesopore volume in comparison with the industrially prepared ones. Despite the similarity in basic properties of the studied materials, the samples with molar ratio Mg:Al = 3 in both groups of LDH using different method of preparation possess the best activity in aldol condensation. Generally, the calcined laboratory samples are more active than the industrial materials in the reaction. This is explained by the better textural properties of the former ones and their susceptibility to in-situ reconstruction in the presence of water formed during the reaction.	Aldol condensation; Layered double hydroxides; Hydrotalcites; Furfural; Acetone

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