Abstract
Selective, active, and robust catalysts are necessary for the efficient utilization of new feedstocks. Face-selective catalysts can precisely modify catalytic properties, but are often unstable under reaction conditions, changing shape and losing selectivity. Herein we report a method for synthesizing stable heterogeneous catalysts in which the morphology and selectivity can be tuned precisely and predictably. Using nanocrystal supports, we epitaxially stabilize specific active phase morphologies. This changes the distribution of active sites of different coordination, which have correspondingly different catalytic properties. Specifically, we utilize the different interfacial free-energies between perovskite titanate nanocube supports with different crystal lattice dimensions and a platinum active phase. By substituting different sized cations into the support, we change the lattice mismatch between the support and the active phase, thereby changing the interfacial free-energy, and stabilizing the active phase in different morphologies in a predictable manner. We correlate these changes in active phase atomic coordination with changes in catalytic performance (activity and selectivity), using the hydrogenation of acrolein as a test reaction. The method is general and can be applied to many nanocrystal supports and active phase combinations.
| Original language | English |
|---|---|
| Pages (from-to) | 1829-1834 |
| Number of pages | 6 |
| Journal | Topics in Catalysis |
| Volume | 56 |
| Issue number | 18-20 |
| DOIs | |
| Publication status | Published - Dec 2013 |
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Keywords
- Acrolein
- Epitaxy
- Heterogeneous catalysis
- Hydrogenation
- Perovskite
- Platinum
ASJC Scopus subject areas
- Catalysis
- Chemistry(all)
Cite this
Epitaxial stabilization of face selective catalysts. / Enterkin, James A.; Kennedy, Robert M.; Lu, Junling; Elam, Jeffrey W.; Cook, Russell E.; Marks, Laurence D.; Stair, Peter C; Marshall, Christopher L.; Poeppelmeier, Kenneth R.
In: Topics in Catalysis, Vol. 56, No. 18-20, 12.2013, p. 1829-1834.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Epitaxial stabilization of face selective catalysts
AU - Enterkin, James A.
AU - Kennedy, Robert M.
AU - Lu, Junling
AU - Elam, Jeffrey W.
AU - Cook, Russell E.
AU - Marks, Laurence D.
AU - Stair, Peter C
AU - Marshall, Christopher L.
AU - Poeppelmeier, Kenneth R
PY - 2013/12
Y1 - 2013/12
N2 - Selective, active, and robust catalysts are necessary for the efficient utilization of new feedstocks. Face-selective catalysts can precisely modify catalytic properties, but are often unstable under reaction conditions, changing shape and losing selectivity. Herein we report a method for synthesizing stable heterogeneous catalysts in which the morphology and selectivity can be tuned precisely and predictably. Using nanocrystal supports, we epitaxially stabilize specific active phase morphologies. This changes the distribution of active sites of different coordination, which have correspondingly different catalytic properties. Specifically, we utilize the different interfacial free-energies between perovskite titanate nanocube supports with different crystal lattice dimensions and a platinum active phase. By substituting different sized cations into the support, we change the lattice mismatch between the support and the active phase, thereby changing the interfacial free-energy, and stabilizing the active phase in different morphologies in a predictable manner. We correlate these changes in active phase atomic coordination with changes in catalytic performance (activity and selectivity), using the hydrogenation of acrolein as a test reaction. The method is general and can be applied to many nanocrystal supports and active phase combinations.
AB - Selective, active, and robust catalysts are necessary for the efficient utilization of new feedstocks. Face-selective catalysts can precisely modify catalytic properties, but are often unstable under reaction conditions, changing shape and losing selectivity. Herein we report a method for synthesizing stable heterogeneous catalysts in which the morphology and selectivity can be tuned precisely and predictably. Using nanocrystal supports, we epitaxially stabilize specific active phase morphologies. This changes the distribution of active sites of different coordination, which have correspondingly different catalytic properties. Specifically, we utilize the different interfacial free-energies between perovskite titanate nanocube supports with different crystal lattice dimensions and a platinum active phase. By substituting different sized cations into the support, we change the lattice mismatch between the support and the active phase, thereby changing the interfacial free-energy, and stabilizing the active phase in different morphologies in a predictable manner. We correlate these changes in active phase atomic coordination with changes in catalytic performance (activity and selectivity), using the hydrogenation of acrolein as a test reaction. The method is general and can be applied to many nanocrystal supports and active phase combinations.
KW - Acrolein
KW - Epitaxy
KW - Heterogeneous catalysis
KW - Hydrogenation
KW - Perovskite
KW - Platinum
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UR - http://www.scopus.com/inward/citedby.url?scp=84887528045&partnerID=8YFLogxK
U2 - 10.1007/s11244-013-0118-y
DO - 10.1007/s11244-013-0118-y
M3 - Article
VL - 56
SP - 1829
EP - 1834
JO - Topics in Catalysis
JF - Topics in Catalysis
SN - 1022-5528
IS - 18-20
ER -