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PdZn nanoparticle catalyst formation for ethanol dehydrogenation : active metal impregnation vs incorporation

Jolien De Waele (UGent) , Vladimir Galvita (UGent) , Hilde Poelman (UGent) , Christophe Detavernier (UGent) and Joris Thybaut (UGent)
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Abstract
Two hydrotalcite-based catalysts have been prepared to investigate the effect of synthesis methods on the catalyst behavior in ethanol dehydrogenation to acetaldehyde. On the first one, PdZn/Mg(Al)Ox, Pd and Zn were impregnated on the hydrotalcite support while on the second one, PdZn/Mg(Al)(Pd)(Zn)Ox, Pd and Zn were both incorporated during the support synthesis. Extensive catalyst characterization such as EXAFS, XPS, STEM, XRD,… allowed concluding that impregnation of the active metals gives rise to larger nanoparticles compared to incorporation. Impregnation provokes incomplete reduction, yielding nanoparticles with a PdZn shell and a Pd core. More homogeneously alloyed nanoparticles were obtained after incorporation. The higher methane selectivity on the impregnated catalyst is in agreement with the less uniformly alloyed nanoparticles, which more likely exhibit adjacent Pd-sites promoting product acetaldehyde decomposition. Overall, incorporation gave rise to the most active and selective catalyst to acetaldehyde for ethanol dehydrogenation to acetaldehyde.
Keywords
PdZn intermetallic compound, Ethanol dehydrogenation, Synthesis method, PROPANE DEHYDROGENATION, HYDROTALCITES, CONVERSION, KINETICS, SUPPORT, ELEMENT

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Chicago
De Waele, Jolien, Vladimir Galvita, Hilde Poelman, Christophe Detavernier, and Joris Thybaut. 2018. “PdZn Nanoparticle Catalyst Formation for Ethanol Dehydrogenation : Active Metal Impregnation Vs Incorporation.” Applied Catalysis A-general 555: 12–19.
APA
De Waele, Jolien, Galvita, V., Poelman, H., Detavernier, C., & Thybaut, J. (2018). PdZn nanoparticle catalyst formation for ethanol dehydrogenation : active metal impregnation vs incorporation. APPLIED CATALYSIS A-GENERAL, 555, 12–19.
Vancouver
1.
De Waele J, Galvita V, Poelman H, Detavernier C, Thybaut J. PdZn nanoparticle catalyst formation for ethanol dehydrogenation : active metal impregnation vs incorporation. APPLIED CATALYSIS A-GENERAL. 2018;555:12–9.
MLA
De Waele, Jolien, Vladimir Galvita, Hilde Poelman, et al. “PdZn Nanoparticle Catalyst Formation for Ethanol Dehydrogenation : Active Metal Impregnation Vs Incorporation.” APPLIED CATALYSIS A-GENERAL 555 (2018): 12–19. Print.
@article{8556827,
  abstract     = {Two hydrotalcite-based catalysts have been prepared to investigate the effect of synthesis methods on the catalyst behavior in ethanol dehydrogenation to acetaldehyde. On the first one, PdZn/Mg(Al)Ox, Pd and Zn were impregnated on the hydrotalcite support while on the second one, PdZn/Mg(Al)(Pd)(Zn)Ox, Pd and Zn were both incorporated during the support synthesis. Extensive catalyst characterization such as EXAFS, XPS, STEM, XRD,{\textellipsis} allowed concluding that impregnation of the active metals gives rise to larger nanoparticles compared to incorporation. Impregnation provokes incomplete reduction, yielding nanoparticles with a PdZn shell and a Pd core. More homogeneously alloyed nanoparticles were obtained after incorporation. The higher methane selectivity on the impregnated catalyst is in agreement with the less uniformly alloyed nanoparticles, which more likely exhibit adjacent Pd-sites promoting product acetaldehyde decomposition. Overall, incorporation gave rise to the most active and selective catalyst to acetaldehyde for ethanol dehydrogenation to acetaldehyde.},
  author       = {De Waele, Jolien and Galvita, Vladimir and Poelman, Hilde and Detavernier, Christophe and Thybaut, Joris},
  issn         = {0926-860X},
  journal      = {APPLIED CATALYSIS A-GENERAL},
  keyword      = {PdZn intermetallic compound,Ethanol dehydrogenation,Synthesis method,PROPANE DEHYDROGENATION,HYDROTALCITES,CONVERSION,KINETICS,SUPPORT,ELEMENT},
  language     = {eng},
  pages        = {12--19},
  title        = {PdZn nanoparticle catalyst formation for ethanol dehydrogenation : active metal impregnation vs incorporation},
  url          = {http://dx.doi.org/10.1016/j.apcata.2018.02.005},
  volume       = {555},
  year         = {2018},
}

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