Abstract
CuTi catalysts, prepared from metallic glass precursors, selectively dehydrate 2-propanol to propylene at 673 K, in contrast to CuZr alloys or Cu foil, with which mostly dehydrogenation to acetone occurs. The catalytic run at 673 K results in complete crystallization of the bulk of CuTi alloys. A higher activity with a slightly lower selectivity is observed when an oxygen treatment is applied prior to the reaction. The morphology of the as-received CuTi ribbons is substantially altered as a consequence of the reaction. The results of N2O titration indicate that the Cu(0) surface area is very low either in the as-received state or after the reaction. X-ray photoelectron spectroscopy depth profile measurements demonstrate considerable Cu enrichment in the near-surface region as a result of the reaction. However, on the topmost layer, only Cu(II) species exist. This is in contrast to the case of CuZr alloys, where both Cu(0) and Cu(II) species coexist. The different reaction paths we observe might be attributed to this finding.
| Original language | English |
|---|---|
| Pages (from-to) | 1095-1098 |
| Number of pages | 4 |
| Journal | Materials Science and Engineering A |
| Volume | 181-182 |
| Issue number | C |
| DOIs | |
| Publication status | Published - máj. 15 1994 |
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- Materials Science(all)
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Dehydration of 2-propanol over CuTi metallic glasses : effect of pretreatments and reaction on the structure and surface properties. / Katona, Tamás; Molnár, Árpád; Bartók, M.
In: Materials Science and Engineering A, Vol. 181-182, No. C, 15.05.1994, p. 1095-1098.Research output: Article
}
TY - JOUR
T1 - Dehydration of 2-propanol over CuTi metallic glasses
T2 - effect of pretreatments and reaction on the structure and surface properties
AU - Katona, Tamás
AU - Molnár, Árpád
AU - Bartók, M.
PY - 1994/5/15
Y1 - 1994/5/15
N2 - CuTi catalysts, prepared from metallic glass precursors, selectively dehydrate 2-propanol to propylene at 673 K, in contrast to CuZr alloys or Cu foil, with which mostly dehydrogenation to acetone occurs. The catalytic run at 673 K results in complete crystallization of the bulk of CuTi alloys. A higher activity with a slightly lower selectivity is observed when an oxygen treatment is applied prior to the reaction. The morphology of the as-received CuTi ribbons is substantially altered as a consequence of the reaction. The results of N2O titration indicate that the Cu(0) surface area is very low either in the as-received state or after the reaction. X-ray photoelectron spectroscopy depth profile measurements demonstrate considerable Cu enrichment in the near-surface region as a result of the reaction. However, on the topmost layer, only Cu(II) species exist. This is in contrast to the case of CuZr alloys, where both Cu(0) and Cu(II) species coexist. The different reaction paths we observe might be attributed to this finding.
AB - CuTi catalysts, prepared from metallic glass precursors, selectively dehydrate 2-propanol to propylene at 673 K, in contrast to CuZr alloys or Cu foil, with which mostly dehydrogenation to acetone occurs. The catalytic run at 673 K results in complete crystallization of the bulk of CuTi alloys. A higher activity with a slightly lower selectivity is observed when an oxygen treatment is applied prior to the reaction. The morphology of the as-received CuTi ribbons is substantially altered as a consequence of the reaction. The results of N2O titration indicate that the Cu(0) surface area is very low either in the as-received state or after the reaction. X-ray photoelectron spectroscopy depth profile measurements demonstrate considerable Cu enrichment in the near-surface region as a result of the reaction. However, on the topmost layer, only Cu(II) species exist. This is in contrast to the case of CuZr alloys, where both Cu(0) and Cu(II) species coexist. The different reaction paths we observe might be attributed to this finding.
UR - http://www.scopus.com/inward/record.url?scp=0028424651&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0028424651&partnerID=8YFLogxK
U2 - 10.1016/0921-5093(94)90809-5
DO - 10.1016/0921-5093(94)90809-5
M3 - Article
AN - SCOPUS:0028424651
VL - 181-182
SP - 1095
EP - 1098
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
IS - C
ER -