n-Decane dehydrogenation on Pt, PtSn and PtGe supported on spinels prepared by different methods of synthesis

Ballarini, Adriana Daniela; Miguel, Sergio R. de; Castro, Alberto A.; Scelza, Osvaldo A.

doi:10.1016/j.apcata.2013.07.030

Cited by 26 publications

(15 citation statements)

References 56 publications

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“…However, due to the existence of the scaling relationship, the enhancement of the activity toward the aimed product frequently accompanies a series of similar side reactions, leading to the reduced selectivity 4 . Considering the specific case of propane dehydrogenation (PDH), the key industrial reaction for the production of propylene is normally catalyzed by PtM alloys such as PtSn 5 , PtZn 6 , PtGa 7 , PtIn 8 , PtGe 9 , and PtCu 10 . Our previous DFT calculations indicate that the catalytic properties of these PtM alloys are indeed restricted by the scaling relationship, which normally results in the promoted selectivity to propylene accompanied with the suppressed intrinsic activity for dehydrogenation of propane 11 .…”

Section: Introductionmentioning

confidence: 99%

Breaking the scaling relationship via thermally stable Pt/Cu single atom alloys for catalytic dehydrogenation

et al. 2018

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Noble-metal alloys are widely used as heterogeneous catalysts. However, due to the existence of scaling properties of adsorption energies on transition metal surfaces, the enhancement of catalytic activity is frequently accompanied by side reactions leading to a reduction in selectivity for the target product. Herein, we describe an approach to breaking the scaling relationship for propane dehydrogenation, an industrially important reaction, by assembling single atom alloys (SAAs), to achieve simultaneous enhancement of propylene selectivity and propane conversion. We synthesize γ-alumina-supported platinum/copper SAA catalysts by incipient wetness co-impregnation method with a high copper to platinum ratio. Single platinum atoms dispersed on copper nanoparticles dramatically enhance the desorption of surface-bounded propylene and prohibit its further dehydrogenation, resulting in high propylene selectivity (~90%). Unlike previous reported SAA applications at low temperatures (<400 °C), Pt/Cu SAA shows excellent stability of more than 120 h of operation under atmospheric pressure at 520 °C.

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Section: Introductionmentioning

confidence: 99%

Breaking the scaling relationship via thermally stable Pt/Cu single atom alloys for catalytic dehydrogenation

et al. 2018

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“…It is in these terms that the effect of various modifiers on the olefin formation selectivity is explained. For example, in the case of platinum-tin compositions the strength of the bonding between the chemisorbed hydrocarbons and the surface platinum atoms can be changed as a result of electron density transfer from tin to platinum [4,6,7,17,19,26,27].…”

Section: Resultsmentioning

confidence: 99%

“…An analysis of the patents of the UOP company [11][12][13][14][15][16] demonstrates that iridium and rhenium are used along with platinum. The cata lysts are modified with some transition metals, such as molybdenum, manganese, and tungsten, as well as with Group IIIA elements (Ga, In, Tl) and Group IVA elements (Ge, Sn, Pb) [17][18][19][20][21][22]. The most common support for the higher n paraffin dehydrogenation cat alysts is γ alumina.…”

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confidence: 99%

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Study of Pt/MgAlO x catalysts in n-decane dehydrogenation

et al. 2015

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The properties of Pt/MgAlO x catalysts based on aluminum-magnesium layered hydroxides have been investigated in n decane dehydrogenation. The n decene formation selectivity depends on the Mg/Al ratio in the support, on the platinum complex binding conditions, and on the platinum content of the cata lyst. Increasing the proportion of magnesium decreases the number of acid cites in the support and changes the properties of supported platinum. As a result, the n decene formation selectivity under the appropriate conditions reaches 90% without a modifier added. * The 0.18%Pt/MgAlO x 3(carb) sample was synthesized using Pt carbonyl complexes, and the other sample were synthesized using Pt(IV) chloro complexes.

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“…The use of supports of metallic catalysts of high surface area, low acidity and good interaction with metals is very important for this kind of reactions carried out at high temperatures to decrease side reactions as alkane cracking and olefin polymerization. In this way, the use of magnesium and zinc spinels as supports presents advantages due to their low acidity and good interaction with the supported metals, as it was informed by Armendáriz et al (2001), Bocanegra et al (2004), Vu et al (2011) and Ballarini et al (2013).…”

Section: Introductionmentioning

confidence: 92%

Synthesis of a Structured Material Based on Compact Spheres Coated with Zn or Mg Spinel

Ballarini

Scelza

Miguel

2015

Procedia Materials Science

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In this work, a synthesis method of coating with thin layers of MgAl 2 O 4 or ZnAl 2 O 4 over -Al 2 O 3 spheres were developed. The method consisted in the deposition of a primer of bohemite on the spheres, followed by the impregnation with a solution of Mg or Zn nitrates, and further thermal treatments in order to obtain MAl 2 O 4 (M: Mg or Zn). This method was modified to improve the thickness and purity of the layer material. With this method, layers of uniform and adequate thickness and good adhesion were achieved. Pt catalysts prepared with these materials as supports displayed good catalytic performances in the nbutane dehydrogenation reaction, especially those obtained with purified supports.

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n-Decane dehydrogenation on Pt, PtSn and PtGe supported on spinels prepared by different methods of synthesis

Cited by 26 publications

References 56 publications

Breaking the scaling relationship via thermally stable Pt/Cu single atom alloys for catalytic dehydrogenation

Breaking the scaling relationship via thermally stable Pt/Cu single atom alloys for catalytic dehydrogenation

Study of Pt/MgAlO x catalysts in n-decane dehydrogenation

Synthesis of a Structured Material Based on Compact Spheres Coated with Zn or Mg Spinel

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