Influence of the support and the preparation methods on the performance in citral hydrogenation of Pt-based catalysts supported on carbon nanotubes

Zgolicz, Patricia Daniela; Stassi, Julieta Paola; Yañez, María Julia; Scelza, Osvaldo A.; Miguel, Sergio R. de

doi:10.1016/j.jcat.2012.02.020

Cited by 44 publications

(52 citation statements)

References 97 publications

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“…It can be seen that the Figure 5 shows the H2-TPR profiles of the synthesized catalysts. The broad peak appeared in the range of 400-800 °C in fresh bare AC relates with the methanation of functional groups ( Figure 5a) [18,33]. As mentioned in our previous work, it can be seen that there appear three reduction peaks located at ca.…”

Section: The Coking Deposition On the Catalystssupporting

confidence: 58%

Synthesis of Vinyl Chloride Monomer over Carbon-Supported Tris-(Triphenylphosphine) Ruthenium Dichloride Catalysts

Zhang

Man

et al. 2018

Catalysts

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A series of catalysts, including Ru/AC, φ-P-Ru/AC, φ-P-Ru/AC-HCl, and φ-P-Ru/AC-HNO 3 , were prepared and evaluated for the hydrochlorination reaction of acetylene. The test results reveal that the φ-P-Ru/AC-HNO 3 catalyst shows superior catalytic performance with an initial acetylene conversion of 97.2% and a relative increment of 87.0% within 48 h in comparison with that of the traditional RuCl 3 catalyst. The substitution of inorganic RuCl 3 precursor by organic φ-P-Ru complex species in the catalysts results in more active species and tends to confine them in the micro-pores; the modification of carbon support by nitric acid in φ-P-Ru catalyst may produce an interaction between the functional groups on modified support and Ru species, which is favorable to anchor and then reduce the loss of active species during the reaction, further increasing the amount of dominating Ru species, and greatly improving the reactants adsorption ability on the catalysts, thus enhancing the performance of the resultant catalysts. The as-prepared φ-P-Ru catalysts are shown to be promising mercury-free candidates for the synthesis of vinyl chloride monomer.

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Section: The Coking Deposition On the Catalystssupporting

confidence: 58%

Synthesis of Vinyl Chloride Monomer over Carbon-Supported Tris-(Triphenylphosphine) Ruthenium Dichloride Catalysts

Zhang

Man

et al. 2018

Catalysts

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“…In this sense, materials with Lewis acid sites induce the adsorption of ␣,␤ unsaturated aldehydes through the carbonyl (C O), which allows the increase of selectivity towards unsaturated alcohols [4]. These Lewis sites can be produced by: (a) the modification of the hydrogenating metal with the addition of a second metal (Pt-M bimetalic catalysts, where M = Sn, Ge, Co) [3,[6][7][8][9], (b) the use of reducible metal oxides [10][11][12][13] or the synthesis of mixed oxides as supports [14]. However, in the case of bimetallic catalysts it has been reported that the addition of electropositive promoters to the metallic active phase brings a decrease of the activity due to the decoration effect of the metallic particle s [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Effect of the acid–base properties of the support on the performance of Pt catalysts in the partial hydrogenation of citral

2013

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“…For the original Ru/AC catalyst, the TPR profile appears several reduction bands centered at 150.0 °C, 256.5 °C, and 325.0 °C, which are related to the reduction of RuOx (x > 2), RuO2, Figure 6 presents the TPR (Temperature-programmed reduction) profiles of the prepared catalysts before and after the reaction. For all the fresh catalysts, the broad peaks appeared in 450-700 • C Catalysts 2017, 7, 311 8 of 13 associate to the characteristic reduction of oxygen-containing functional groups on AC (Figure 6) [33,34]. For the original Ru/AC catalyst, the TPR profile appears several reduction bands centered at 150.0 • C, 256.5 • C, and 325.0 • C, which are related to the reduction of RuO x (x > 2), RuO 2 , and RuCl 3 , respectively (Figure 6a).…”

Section: The Coke Deposition On the Spent Catalysts During The Reactionmentioning

confidence: 97%

“…Figure 6 presents the TPR (Temperature-programmed reduction) profiles of the prepared catalysts before and after the reaction. For all the fresh catalysts, the broad peaks appeared in 450-700 °C associate to the characteristic reduction of oxygen-containing functional groups on AC (Figure 6) [33,34]. For the original Ru/AC catalyst, the TPR profile appears several reduction bands centered at 150.0 °C, 256.5 °C, and 325.0 °C, which are related to the reduction of RuOx (x > 2), RuO2, Figure 6 presents the TPR (Temperature-programmed reduction) profiles of the prepared catalysts before and after the reaction.…”

Section: The Coke Deposition On the Spent Catalysts During The Reactionmentioning

confidence: 98%

Activated Carbon-Supported Tetrapropylammonium Perruthenate Catalysts for Acetylene Hydrochlorination

Zhang

Man

et al. 2017

Catalysts

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Abstract:The Ru-based catalysts, including Ru/AC (activated carbon), TPAP (tetrapropylammonium perruthenate)/AC, TPAP/AC-HNO 3 , and TPAP/AC-HCl, were prepared and assessed for the direct synthesis of vinyl chloride monomer. The results indicate that the TPAP/AC-HCl catalyst exhibits the best performance with the conversion falling from 97% to 91% in 48 hours' reaction under the conditions of 180 • C, a GHSV(C 2 H 2 ) of 180 h −1 , and the feed ratio V HCl /V C2H2 of 1.15. The substitution of RuCl 3 precursor with high valent TPAP species leads to more ruthenium oxides active species in the catalysts; the acidification treatment of carrier in TPAP/AC catalyst can produce an enhanced interaction between the active species and the modified functional groups on the carrier, and it is beneficial to inhibit the carbon deposition and sintering of ruthenium species in the reaction process, greatly increase the adsorption ability of reactants, and further increase the amount of dominating active species in the catalysts, thus improving the catalytic performance. This also provides a promising strategy to explore high efficient and economic mercury-free catalysts for the hydrochlorination of acetylene.

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Influence of the support and the preparation methods on the performance in citral hydrogenation of Pt-based catalysts supported on carbon nanotubes

Cited by 44 publications

References 97 publications

Synthesis of Vinyl Chloride Monomer over Carbon-Supported Tris-(Triphenylphosphine) Ruthenium Dichloride Catalysts

Synthesis of Vinyl Chloride Monomer over Carbon-Supported Tris-(Triphenylphosphine) Ruthenium Dichloride Catalysts

Effect of the acid–base properties of the support on the performance of Pt catalysts in the partial hydrogenation of citral

Activated Carbon-Supported Tetrapropylammonium Perruthenate Catalysts for Acetylene Hydrochlorination

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