MIBK from acetone on Pd/H-[Ga]ZSM5 catalysts: Effect of metal loading

Mediavilla, Marta; Melo, Luis; Díaz, Yraida; Albornoz, Alberto; Llanos, Aura; Brito, Joaquı́n L.

doi:10.1016/j.micromeso.2008.05.034

Cited by 17 publications

(9 citation statements)

References 23 publications

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“…4 and 5). Saturated C6 and C9 ketones (MIBK and DIBK, respectively) highlight as the main products, reaching selectivity values higher than 95 % (at ~42 % of acetone conversion), being better results than those reported in the literature [27][28][29][30].…”

Section: Catalyst Performance In Presence Of H2mentioning

confidence: 70%

Effect of metal modification of titania and hydrogen co-feeding on the reaction pathways and catalytic stability in the acetone aldol condensation

Quesada

Faba

Dı́az

et al. 2019

Journal of Catalysis

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A stable performance of TiO2 catalysts for gas-phase acetone aldol condensation was observed when reduced metals were added (Pt or Ni, 1.5 wt.%) and the reactions were conducted in presence of hydrogen. In both cases, the resulting metal-loaded catalysts are stable for 10 h, whereas continuous deactivation is observed for the parent TiO2 catalyst (573 K). Both the activation of the H2 molecule by metal nanoparticles and the change of the catalytic surface by metal insertion (in the case of Niloaded catalyst) enable suppressing oligomerization (by hindering enolates formation) and the strong adsorption of intermediates (by decreasing the concentration of high-strength acid-basic active sites), respectively. More interestingly, these metals allow to tune the selectivity of the reaction. Indeed, the Ni-loaded titania catalyst is highly selective for the synthesis of α,β-unsaturated ketones (selectivity to unsaturated C6 and C9 species >98 %, at ~12 % acetone conversion), whereas the Pt-loaded one is 2 highly selective to the formation of saturated C6 and C9 ketones (MIBK and DIBK, with selectivities >95 % at ~42 % acetone conversion).The catalytic activity and stability of the two materials (Ni/TiO2 and Pt/TiO2) in both absence and presence of H2 are compared between them and with those of the parent TiO2. The results obtained by the reaction gas-phase analysis are supplemented through different solid characterization techniques (i.e., CO2-TPD and NH3-TPD, HRTEM, XPS, TPO, and DRIFTS).

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Section: Catalyst Performance In Presence Of H2mentioning

confidence: 70%

Effect of metal modification of titania and hydrogen co-feeding on the reaction pathways and catalytic stability in the acetone aldol condensation

Quesada

Faba

Dı́az

et al. 2019

Journal of Catalysis

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“…A palladium catalyst supported on MFI‐type gallosilicate was recently reported by Mediavilla et al97 Use of MFI zeolites is justified by the minimization of high‐molecular‐weight condensation byproducts, because of the medium pore size of these zeolites. However, metal catalyst stability in these acidic supports is usually very poor as a result of the fast deactivation caused by coke formation.…”

Section: Hydrogenation Catalystsmentioning

confidence: 99%

Heterogeneous Bifunctional Metal/Acid Catalysts for Selective Chemical Processes

et al. 2012

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Heterogeneous catalysts enabling multiple reaction sequences in one pot have a great potential for large‐scale production processes in terms of productivity, cost‐effectiveness, and low environmental impact. This paper reviews the most representative examples and the recent achievements in the field of solid bifunctional metal/acid‐site catalysts and their application to the production of fine chemicals through selective, cooperative, or sequential processes in single reactor units. The literature that appeared from January 2009 to January 2012 is covered.

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“…At present, MIBK is mainly manufactured by a one-pot process, composed of three steps, say, acetone condensation catalyzed by acid or base to diacetone alcohol (DAA), DAA dehydration catalyzed by acid to mesityl oxide (MO), and MO hydrogenation catalyzed by Pd to MIBK. 2,3 Normally, MIBC could also be generated in this one-pot process. To date, the only commercialized multifunctional catalyst is Pd/resin, which possess both the acid and Pd sites, which delivered an acetone conversion of 25-50% with a MIBK selectivity of 70-90% at 1-10 MPa and 120-150 C. [4][5][6][7] Nevertheless, due to the poor thermal stability of the resin, the Pd loss and aggregation during long term operation is inevitable, which leads to the deactivation of catalyst.…”

Section: Introductionmentioning

confidence: 99%

An active and stable multifunctional catalyst with defective UiO-66 as a support for Pd over the continuous catalytic conversion of acetone and hydrogen

Mei

Lin

et al. 2021

RSC Adv.

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MIBK from acetone on Pd/H-[Ga]ZSM5 catalysts: Effect of metal loading

Cited by 17 publications

References 23 publications

Effect of metal modification of titania and hydrogen co-feeding on the reaction pathways and catalytic stability in the acetone aldol condensation

Effect of metal modification of titania and hydrogen co-feeding on the reaction pathways and catalytic stability in the acetone aldol condensation

Heterogeneous Bifunctional Metal/Acid Catalysts for Selective Chemical Processes

An active and stable multifunctional catalyst with defective UiO-66 as a support for Pd over the continuous catalytic conversion of acetone and hydrogen

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