2007
DOI: 10.1016/j.molcata.2007.03.037
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One-step synthesis of methyl isobutyl ketone from acetone over Pd/MCM-22 zeolites

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Cited by 10 publications
(6 citation statements)
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“…Microporous Brønsted acids provide confining voids of molecular dimensions surrounding acidic protons; such voids can confer unique reactivity and selectivity to these protons, in spite of the similar acid strength of aluminosilicates [12,13], through the selective diffusion of certain reactants and products or the preferential van der Waals stabilization of specific intermediates and transition states. Several zeolites have been reported to catalyze aldol condensations (MFI [10,11,[14][15][16][17][18][19], BEA [20,21], MWW [22], and FAU [14,19,23]), but ubiquitous deactivation and inhibition by co-products have precluded unequivocal mechanistic conclusions, making it difficult to assess even what type of acid sites account for condensation turnovers: acidic O-H groups [10], Lewis [19], or both types of acid sites acting in concert [19,24]. Sequential condensation reactions of α,β-unsaturated products form arenes [25,26] (e.g.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…Microporous Brønsted acids provide confining voids of molecular dimensions surrounding acidic protons; such voids can confer unique reactivity and selectivity to these protons, in spite of the similar acid strength of aluminosilicates [12,13], through the selective diffusion of certain reactants and products or the preferential van der Waals stabilization of specific intermediates and transition states. Several zeolites have been reported to catalyze aldol condensations (MFI [10,11,[14][15][16][17][18][19], BEA [20,21], MWW [22], and FAU [14,19,23]), but ubiquitous deactivation and inhibition by co-products have precluded unequivocal mechanistic conclusions, making it difficult to assess even what type of acid sites account for condensation turnovers: acidic O-H groups [10], Lewis [19], or both types of acid sites acting in concert [19,24]. Sequential condensation reactions of α,β-unsaturated products form arenes [25,26] (e.g.…”
Section: Introductionmentioning
confidence: 99%
“…1,3,5-trimethylbenzene from acetone condensation) that bind strongly onto Brønsted acid active sites, thus preventing those sites from catalyzing additional turnovers [14,27]. The presence of an intracrystalline Pt function has been reported to inhibit the formation of such arenes by hydrogenating the α,β-unsaturated intermediates to their saturated alkanone analogs before subsequent reactions [22,[27][28][29][30]. The practical implementation of these bifunctional strategies seeks to limit parallel acetone hydrogenation reactions by using Pt, which favors C=C over C=O hydrogenation [31,32], and low partial pressures of H 2 ; such strategies have led to incomplete inhibition of deactivation processes [22,[27][28][29][30], thus precluding kinetic measurements and rigorous assessment of intrinsic reactivities, which require stable catalysts.…”
Section: Introductionmentioning
confidence: 99%
“…In a confined space of microporous zeolites, reactions of acetone over the Brønsted acid site selectively produce mesityl oxide. The mesityl oxide can be hydrogenated to produce methyl isobutyl ketone, which is widely used as a solvent for paints, lacquers, and certain types of polymers and resins. The process can be carried out in a single step over bifunctional catalysts (e.g., Pt/H-ZSM-5, Pd/H-MCM-22, etc.). Aldol condensation is very important for the transformation of acetone to methyl isobutyl ketone. …”
Section: Introductionmentioning
confidence: 99%
“…The activity Pd or Pt supported on molecular sieves/zeolites like HZSM-5, MCM-22, MCM-56, MCM-49, Na/Cs-X catalysts for gas phase synthesis of MIBK has been subject several investigations [55][56][57][58][59][60][61][62][63]. The results obtained on these catalysts are summarized in Table 2.…”
Section: Miscellaneous Catalystsmentioning
confidence: 99%