Medium effect in thermal pretreatment on the state and catalytic properties of platinum supported on zinc-aluminium spinel

Пахомов, Н. А.; Buyanov, R. A.; Мороз, Э. М.; Kotel’nikov, G. R.; Patanov, V. A.

doi:10.1007/bf02070496

Cited by 24 publications

(22 citation statements)

References 2 publications

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“…These lines are in agreement with the values reported in the literature for d-PtZn alloy [20]. This alloy appears to be inactive for the hydrogen chemisorption, dehydrogenation of paraffins [20] and for the oxidation of isobutene [22]. However, this effect does not appear to be important for explaining the behavior of this monometallic catalyst in the H 2 chemisorption measurements.…”

Section: Hydrogen Chemisorptionsupporting

confidence: 93%

“…However, an additional XRD experiment on Pt(1 wt.%)/ ZnAl 2 O 4 showed the characteristic lines of the Pt-Zn alloys (at d = 3.509, 2.219 and 1.747 Å ) but with very low intensities. These lines are in agreement with the values reported in the literature for d-PtZn alloy [20]. This alloy appears to be inactive for the hydrogen chemisorption, dehydrogenation of paraffins [20] and for the oxidation of isobutene [22].…”

Section: Hydrogen Chemisorptionsupporting

confidence: 92%

“…Taking into account that both bimetallic catalysts have a bulk Sn/Pt atomic ratio of 2.74, it can be inferred that there is a certain surface enrichment in Sn in both catalysts, mainly for the PtSn(0.5 wt.%)/MgAl 2 O 4 one. [6,20].…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 98%

“…Taking into account these behaviors, it would be also possible to use these supports in catalysts for dehydrogenation of linear paraffins with high molecular weight in order to produce the corresponding mono-olefins. www.elsevier.com/locate/apcata Applied Catalysis A: General 277 (2004) [11][12][13][14][15][16][17][18][19][20][21][22] It must also be indicated that olefins have a very wide application in the production of polymers, intermediaries for detergents and additives for gasoline (MTBE) [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Performance of PtSn catalysts supported on MAl2O4 (M: Mg or Zn) in n-butane dehydrogenation: characterization of the metallic phase

Guerrero-Ruı́z

Miguel

Scelza

2004

Applied Catalysis A: General

112

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Section: Hydrogen Chemisorptionsupporting

confidence: 93%

Section: Hydrogen Chemisorptionsupporting

confidence: 92%

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance of PtSn catalysts supported on MAl2O4 (M: Mg or Zn) in n-butane dehydrogenation: characterization of the metallic phase

Guerrero-Ruı́z

Miguel

Scelza

2004

Applied Catalysis A: General

112

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“…This suggests that the formation of PtZn alloy occurred during the H 2 reduction. 19,20 By using a quantitative multicomponent Rietveld analysis, we estimated that $70% of Pt forms large Pt particles in 1Pt/ZnAl 2 O 4 -1WO sample, which is in line with the loss in Pt dispersion (from 40.2% to 10.4%) determined via H 2 chemisorption as discussed above.…”

Section: -21mentioning

confidence: 60%

Stabilization and transformation of Pt nanocrystals supported on ZnAl₂O₄spinel

Kovařík

Cheng

et al. 2017

RSC Adv.

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The role of interfacial interaction on the stabilization and transformation of Pt nanocrystals supported on zinc aluminate (ZnAl 2 O 4 ) was systematically studied in this work. In addition to the remarkable stability of Pt nanocrystals supported on the {111} ZnAl 2 O 4 facet under a harsh oxidizing atmosphere, we also identified the phase segregation of ZnAl 2 O 4 to ZnO and Al 2 O 3 and the transformation of Pt to PtZn bimetallic alloy for Pt supported on other facets. High resolution scanning transmission electron microscopy and X-ray diffraction analyses reveal the phase segregation is associated with a cation migration mechanism associated with replacement of Zn 2+ by Al 3+ in the spinel structure. This work confirms the strong interfacial interactions between precious metal nanocrystals and that the spinel support is a general mechanism for stabilizing precious metal catalysts, with important implications for the rational design of stable integrated catalysis systems.

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Highly selective and stable multimetallic catalysts for propane dehydrogenation

Miguel

Jablonski

Castro

et al. 2000

J. Chem. Technol. Biotechnol.

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Different mono (Pt), bi (Pt±Sn, Pt±Pb, Pt±Ga) and trimetallic (Pt±Sn±Ga) catalysts based on Pt and supported on different materials (Al 2 O 3 , Al 2 O 3 ±K and ZnAl 2 O 4 ) were tested under severe process conditions in the propane dehydrogenation reaction (both in continuous and in pulse reactors). Results show that the Pt±Sn±Ga/ZnAl 2 O 4 catalyst has a better and more stable performance in propane dehydrogenation (high yield to propene and low coke deposition), than the other bi-and trimetallic systems and a commercial catalyst. Thus, the use of an adequate support (ZnAl 2 O 4 ) in combination with the addition of Ga to the Pt±Sn bimetallic system enhances the catalytic performance. INTRODUCTIONThe selective propane dehydrogenation to propene is a very important industrial process since it produces a valuable raw material for polypropene manufacture. This process can be carried out by using supported metallic catalysts, though several dif®culties should be avoided in order to develop catalysts with a good performance. In this sense, both the inhibition of hydrogenolysis and cracking reactions, and the minimisation of the coke deposition, are major requirements in order to increase the selectivity to propene and the catalytic stability. From the development of the STAR Process, 1 different bimetallic supported systems have been studied in this reaction. The utilisation of non-acidic and thermal stable supports, such as MgAl 2 O 4 or ZnAl 2 O 4 , 2±4 appears as an important factor in order to increase the stability of the metallic phase during successive operational cycles. Besides, the addition of Sn to Pt improves alkene formation and reduces coke deposition. 5 Hence, both the selection of an adequate support and the composition of the metallic phase can be considered as relevant factors in order to develop better catalysts for this process.In this paper, the behaviour of different catalysts (Pt, Pt±Sn, Pt±Ga, Pt±Pb and Pt±Sn±Ga supported on Al 2 O 3 , K±Al 2 O 3 and ZnAl 2 O 4 ) in the propane dehydrogenation reaction are compared with a commercial catalyst used for dehydrogenation of alkanes on an industrial scale. The effects of the three different supports and the addition of several inactive metals of

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Medium effect in thermal pretreatment on the state and catalytic properties of platinum supported on zinc-aluminium spinel

Cited by 24 publications

References 2 publications

Performance of PtSn catalysts supported on MAl2O4 (M: Mg or Zn) in n-butane dehydrogenation: characterization of the metallic phase

Performance of PtSn catalysts supported on MAl2O4 (M: Mg or Zn) in n-butane dehydrogenation: characterization of the metallic phase

Stabilization and transformation of Pt nanocrystals supported on ZnAl₂O₄spinel

Highly selective and stable multimetallic catalysts for propane dehydrogenation

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Medium effect in thermal pretreatment on the state and catalytic properties of platinum supported on zinc-aluminium spinel

Cited by 24 publications

References 2 publications

Performance of PtSn catalysts supported on MAl2O4 (M: Mg or Zn) in n-butane dehydrogenation: characterization of the metallic phase

Performance of PtSn catalysts supported on MAl2O4 (M: Mg or Zn) in n-butane dehydrogenation: characterization of the metallic phase

Stabilization and transformation of Pt nanocrystals supported on ZnAl2O4spinel

Highly selective and stable multimetallic catalysts for propane dehydrogenation

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Stabilization and transformation of Pt nanocrystals supported on ZnAl₂O₄spinel