Influence of the acid–base properties of solid catalysts derived from hydrotalcite-like compounds on the condensation of formaldehyde and acetaldehyde

Dumitriu, Emil; Hulea, Vasile; Chelaru, Carmen; Catrinescu, Cezar; Tichit, Didier; Durand, Robert

doi:10.1016/s0926-860x(98)00282-8

Cited by 89 publications

(49 citation statements)

References 41 publications

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“…The aldol condensation of formaldehyde with acetaldehyde in the gas phase was reportedo ver different solid catalysts including mixed oxides, [17] zeolites, [19,[21][22][23] hydrotalcites, [18] and clays, [24] and the balanceb etween acidic and basic sites was often pointedo ut as the key factor drivingt he selectivity of the reaction. The aldol condensation of formaldehyde with acetaldehyde in the gas phase was reportedo ver different solid catalysts including mixed oxides, [17] zeolites, [19,[21][22][23] hydrotalcites, [18] and clays, [24] and the balanceb etween acidic and basic sites was often pointedo ut as the key factor drivingt he selectivity of the reaction.…”

Section: Introductionmentioning

confidence: 99%

“…Until now,r e-Scheme1.Expected reaction pathway of acrolein production starting from methanol and ethanol. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][21][22][23][24][25][26][27][28] Owing to the complexity of the process,f urtherr esearchi sn eededt ou nderstand the role of the acidity and basicity of the catalysts in such reactions and to clarify the reaction pathway.T he quantification of the acid/ base-site concentration and strength on the surface of oxide catalysts is even more crucial if the reactioni sp erformed in the presence of oxygen because it can lead to over-oxidation. [17b, 18-20, 24] The presence of basic sites is reported to be essentialt oi ncrease the activity and selectivity of the aldolization, butt heir strength also plays ar ole in eventual side reactions.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Catalyst Acid/Base Properties in Acrolein Production by Oxidative Coupling of Ethanol and Methanol

et al. 2017

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Oxidative coupling of methanol and ethanol represents a new route to produce acrolein. In this work, the overall reaction was decoupled in two steps, the oxidation and the aldolization, by using two consecutive reactors to investigate the role of the acid/base properties of silica-supported oxide catalysts. The oxidation of a mixture of methanol and ethanol to formaldehyde and acetaldehyde was performed over a FeMoO catalyst, and then the product mixture was transferred without intermediate separation to a second reactor, in which the aldol condensation and dehydration to acrolein were performed over the supported oxides. The impact of the acid/base properties on the selectivity towards acrolein was investigated under oxidizing conditions for the first time. The acid/base properties of the catalysts were investigated by NH -, SO -, and methanol-adsorption microcalorimetry. A MgO/SiO catalyst was the most active in acrolein production owing to an appropriate ratio of basic to acidic sites.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Catalyst Acid/Base Properties in Acrolein Production by Oxidative Coupling of Ethanol and Methanol

et al. 2017

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“…Hydrotalcite-type (HT) compounds, in particular, the Mg/Al mixed oxides obtained from HT precursors had high surface area, basic properties and small crystal sizes [3,4], and then were considered as the suitable support of nickel catalysts for methane reformation [5][6][7][8], allowing a well dispersed and stable metal nickel particles. Furthermore, various basic elements were added to reduce carbon deposition as well as sintering [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Fluorine-Modified Mesoporous Ni–Mg–Al Mixed Oxides for Partial Oxidation of Methane

2010

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Fluorine-modified Ni-Mg-Al mixed oxides prepared by thermal decomposition of hydrtalcite-type (HT) precursor was characterized by XRD, EXAFS, TGA, SEM, TPD-CO 2 , TPR-H 2 , N 2 adsorption/desorption technique, and then tested in the partial oxidation of methane (POM). The result revealed that fluorine was successfully introduced into Ni-Mg-Al mixed oxide via the high dispersion of MgF 2 , which led to the formation of the periclase-type catalyst with mesoporous structure. By compared with pure Ni-Mg-Al mixed oxides, they had the low surface area and crystallization with small particle size, but the high moderate and strong basicity. Such catalyst showed a high performance over POM without deactivation even after 120 h run at 1053 K. This could be attributed to the promotion effect of the F -anions, which improved the homogeneous distribution of nickel and basicity of the catalyst with high resistance to coking and sintering.

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“…[18] Vollständig deuteriertes Aceton ( [D 6 ]Aceton) wurde in Gegenwart von metallsubstituierten Beta-Zeolithen und tert-Butanol auf 90 8 8Ce rhitzt und anschließend mittels 13 Der beschriebene kooperative Mechanismus ist in Einklang mit unserem Verständnis von der Kreuzaldolkondensation von Acetaldehyd und Formaldehyd unter Bildung von Acrolein in der Dampfphase. [19] Überlegungen hinsichtlich des Katalysatordesigns unter Berücksichtigung der ähnlichen Elektronendichte an den Sauerstoffatomen der beiden Aldehyde [20] haben zu neuen Ansätzen geführt, die darauf abzielen, die sauren und basischen Eigenschaften von Heterogenkatalysatoren auszubalancieren. In Weiterführung der Verçffentlichungen zur Verwendung von MgO-ZSM-5, YFaujasit, Mordenit und SAPO-34 [21] …”

Section: Direkte Aldol-/retroaldol-reaktionenunclassified

Metalloenzymartige Zeolithe als Lewis‐Säure‐Katalysatoren für die C‐C‐Bindungsbildung

Vyver

Román‐Leshkov

2015

Angewandte Chemie

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In den letzten Jahren wurde der Verwendung von metalloenzymartigen Zeolithen als Lewis‐Säure‐Katalysatoren für C‐C‐Kupplungen zunehmende Aufmerksamkeit geschenkt. Insbesondere die Beobachtung, dass hydrophobe Zeolithe mit isolierten Metallzentren im Gerüst direkte Aldolkondensationen ermöglichen, hat die Entwicklung von Katalyseverfahren für die Herstellung von Chemikalien ausgehend von aus Biomasse stammenden Verbindungen angestoßen. Die Entdeckung von neuen Diels‐Alder‐Cycloadditions‐/Dehydratisierungswegen sowie experimentelle und rechnerische Untersuchungen von Lewis‐Säure‐katalysierten Carbonyl‐En‐Reaktionen haben die Entwicklung dieses schnell wachsenden Forschungsgebietes weiter vorangetrieben.

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Influence of the acid–base properties of solid catalysts derived from hydrotalcite-like compounds on the condensation of formaldehyde and acetaldehyde

Cited by 89 publications

References 41 publications

Influence of Catalyst Acid/Base Properties in Acrolein Production by Oxidative Coupling of Ethanol and Methanol

Influence of Catalyst Acid/Base Properties in Acrolein Production by Oxidative Coupling of Ethanol and Methanol

Fluorine-Modified Mesoporous Ni–Mg–Al Mixed Oxides for Partial Oxidation of Methane

Metalloenzymartige Zeolithe als Lewis‐Säure‐Katalysatoren für die C‐C‐Bindungsbildung

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