Acetone and Acetaldehyde Oligomerization on TiO2 Surfaces

Luo, Shusheng; Falconer, John L.

doi:10.1006/jcat.1999.2511

Cited by 99 publications

(107 citation statements)

References 39 publications

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“…This mechanism has been proved in our catalysis experiments by changing the reactants. Luo and Falconer [25,26] found that the crotonaldehyde formed from acetaldehyde condensation could condense further with acetaldehyde through Michael reaction and aldol condensation to produce the hexa-2,4-dienal and branched compounds. These intermediates can aldolize with acetaldehydes further and produce larger molecules, which are the precursors of coke.…”

Section: Resultsmentioning

confidence: 98%

The Effect of H2 on Chichibabin Condensation Catalyzed by Pure ZSM-5 and Pt/ZSM-5 for Pyridine and 3-Picoline Synthesis

Jin

2009

Catal Lett

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The effects of H 2 in the feed gasses on the Chichibabin condensation of ammonia with formaldehyde and acetaldehyde for pyridine and 3-picolines synthesis were studied in this work. It was observed that over Pt/ZSM-5 and H-ZSM-5 catalyst hydrogen can moderate the deactivation, depressed the coke formation, slightly lower the initial yield of pyridine bases and increase the selectivity of pyridine over 3-picoline. These effects cannot be simply attributed to the reactant dilution by H 2 , while are similar as those of spilt-over hydrogen on a Pt/ZSM-5 catalyst on this reaction. These phenomena are taken as the evidence to support the hypothesis that molecular H 2 is activated by the pure zeolite during the Chichibabin condensation.

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Section: Resultsmentioning

confidence: 98%

The Effect of H2 on Chichibabin Condensation Catalyzed by Pure ZSM-5 and Pt/ZSM-5 for Pyridine and 3-Picoline Synthesis

Jin

2009

Catal Lett

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“…It was also reported that the photocatalytic activity of TiO 2 could be improved by increasing or creating of surface acidity [33,34]. In the case of decomposition of acetaldehyde over TiO 2 -SiO 2 , acetaldehyde condensation reactions could be proceeded with acetaldehyde on the Lewis acid sites of titania at 100°C [35,36]. Since the acidity of catalyst may be correlated with the acetaldehyde conversion in catalytic reactions, acidic TiO 2 such as sulfated TiO 2 is expected to exhibit higher reaction in acetaldehyde decomposition than pure TiO 2 [37].…”

Section: Ti-o-timentioning

confidence: 97%

Photocatalytic Properties of Silica-supported TiO2

2005

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TiO 2 supported on SiO 2 surface is effective on the recovery of photocatalyst, morphological control, and coating on the substrate. Furthermore, it shows much higher photocatalytic activity than pure TiO 2 . The silica support is quite influential on the surface properties of TiO 2 supported on SiO 2 . The enhanced photocatalytic activity of TiO 2 -SiO 2 could be explained by the effects of surface area, adsorption, band-gap energy and local structure. However, it is difficult to say which one is the most important factor responsible for the photocatalytic property of TiO 2 -SiO 2 . For example, the reduction of particle size could effect on both of the surface area and band-gap energy. And, Ti-O-Si bonds could modify the band-gap energy and local structure. Therefore, the photocatalytic properties of TiO 2 -SiO 2 should be expressed by sum of many factors such as surface area, adsorption, band-gap energy and local structure.

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“…Among them, Mg-based catalysts, such as MgO and Mg-Al mixed oxide catalysts attracted more attention [5][6][7][8][9][10]. It was reported that Mg-Al mixed oxides derived from the calcination of hydrotalcite showed relatively high selectivity of isophorone (up to 79.6%).…”

Section: Introductionmentioning

confidence: 99%

“…Some solid basic catalysts have been reported for the aldol condensation of acetone, including CaO-Ca(OH) 2 , Mg-based catalysts, Cs/carbon material, (VO) 2 P 2 O 7 , alkali doped silica or TiO 2 , and zeolites [4][5][6][7][8][9][10][11][12][13][14][15]. Among them, Mg-based catalysts, such as MgO and Mg-Al mixed oxide catalysts attracted more attention [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%