Effect of the addition of Au in zirconia and ceria supported Pd catalysts for the direct synthesis of hydrogen peroxide

Menegazzo, Federica; Burti, Pierluigi; Signoretto, Michela; Manzoli, Maela; Vankova, Svetoslava; Boccuzzi, F.; Pinna, Francesco; Strukul, Giorgio

doi:10.1016/j.jcat.2008.05.019

Cited by 83 publications

(159 citation statements)

References 36 publications

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“…The earlier results obtained in a semibatch reactor 4,5,26 agree with the ranking just described. The catalyst based on sulfated zirconia showed a quite good performance, while the production rate with the Pd-Z catalyst was not as high, because of the significant water formation compared to the Pd-ZS catalyst (Figures 3 and 7).…”

Section: Industrial and Engineering Chemistry Researchsupporting

confidence: 89%

“…A more detailed characterization is reported elsewhere. 4,5,26 Catalyst properties are summarized in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…This catalyst has very good properties for the direct synthesis, as previously assessed under semibatch conditions. 4,5 It shows very good performances also with the TBR. A significant hydrogen peroxide production was achieved with a liquid flow rate of 0.5 mL/min, as displayed in Figure 7.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 86%

“…This is a very interesting and industrially promising value, a much higher one than obtained in a semibatch reactor, where the highest selectivity measured was about 50%. 4,5 Hence, this particular combination between the catalyst and the reactor shows very interesting results, with a remarkable improvement of the catalyst performance.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 94%

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Direct Synthesis of Hydrogen Peroxide in a Trickle Bed Reactor: Comparison of Pd-Based Catalysts

Biasi

Canu

Menegazzo

et al. 2012

Ind. Eng. Chem. Res.

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Palladium catalysts based on different supports, silica (SiO 2 ), zirconia (Z), sulfated ceria (CeS), and sulfated zirconia (ZS), previously tested in a semibatch reactor, were chosen to demonstrate how the direct synthesis process can be improved by continuous operation in a three-phase fixed bed. The gas and liquid flow rates were systematically varied to find suitable combinations for a maximum hydrogen peroxide production rate and selectivity. Different catalysts gave the same results in terms of selectivity and production rate with different operating conditions. A selectivity of 60% and 70% was found with two different catalysts (namely, Pd-ZS and Pd-CeS). Very interestingly those selectivities were found with different gas and liquid flow rates (i.e., 70% of selectivity for Pd-ZS with liquid 1 mL/min and gas 2.7 mL/min, liquid 0.5 mL/min MeOH and gas 4 mL/ min, and finally liquid 2 mL/min MeOH and gas 1 mL/min 65% of selectivity for Pd-CeS with liquid 1 mL/min and gas 4 mL/ min). Moreover, the same maximum production rate of H 2 O 2 around 3 μmol/min for Pd-CeS, Pd-ZS, and Pd-Z was achieved with different liquid and gas flow rates. Continuous operation and reactor technology play important roles in this green synthesis: optimization of gas and liquid flow rates and contact time between the liquid and the solid (catalysts) phase lead to a dramatic selectivity improvement in a continuous reactor, raising the value obtained in the semibatch reactor from 30% to 70%.

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Section: Industrial and Engineering Chemistry Researchsupporting

confidence: 89%

“…A more detailed characterization is reported elsewhere. 4,5,26 Catalyst properties are summarized in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 86%

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 94%

See 2 more Smart Citations

Direct Synthesis of Hydrogen Peroxide in a Trickle Bed Reactor: Comparison of Pd-Based Catalysts

Biasi

Canu

Menegazzo

et al. 2012

Ind. Eng. Chem. Res.

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“…Ceria support was synthesized by precipitation from (NH 4 ) 2 Ce(NO 3 ) 6 by urea at 100˝C in aqueous solution [24,25]. The solution was mixed and boiled for 6 h at 100˝C, the precipitate was washed twice in boiling deionized water and dried at 110˝C overnight.…”

Section: Synthesis Of Supportsmentioning

confidence: 99%

Effects of Support and Synthetic Procedure for Sol-Immobilized Au Nanoparticles

et al. 2016

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Abstract:New gold catalysts supported on CeO 2 , ZrO 2 and TiO 2 were synthesized by two different techniques: deposition-precipitation and colloidal method. The role of the surfactant (PVA, PVP, THPC) was also investigated. The catalysts were tested in the oxidation of glucose to gluconic acid, in aqueous environment and under mild conditions (60˝C and atmospheric pressure). TEM and SEM analyses have shown that the small size of gold nanoparticles is a necessary condition, but not sufficient for a good conversion. In fact, for an active sample, we have verified that the excess of surfactant must be removed because it would coat the surface of the catalyst. The surfactant, however, should not be completely eliminated, since it has the fundamental role of stabilizing the sample preventing nanoparticles from aggregation. It was evidenced that both the synthetic approach and the kind of support affect the catalysts' activity. In fact, by focusing on the three different supports, with all the preparation methods, the ceria has proved to be the best support. This is due to its ability to obtain small gold nanoparticles and to its ability to accumulate oxygen. The most appropriate synthesis methodology proved to be the colloidal method with PVA. Recyclability issue was investigated too.

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Environmentally Benign Oxidants

Strukul¹,

Scarso²

2013

Liquid Phase Oxidation via Heterogeneous Catalysis

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Effect of the addition of Au in zirconia and ceria supported Pd catalysts for the direct synthesis of hydrogen peroxide

Cited by 83 publications

References 36 publications

Direct Synthesis of Hydrogen Peroxide in a Trickle Bed Reactor: Comparison of Pd-Based Catalysts

Direct Synthesis of Hydrogen Peroxide in a Trickle Bed Reactor: Comparison of Pd-Based Catalysts

Effects of Support and Synthetic Procedure for Sol-Immobilized Au Nanoparticles

Environmentally Benign Oxidants

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