Dehydration of 2-propanol over CuTi metallic glasses: effect of pretreatments and reaction on the structure and surface properties

Tamás Katona, Árpád Molnár, M. Bartók

Research output: Article

13 Citations (Scopus)

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 languageEnglish
Pages (from-to)1095-1098
Number of pages4
JournalMaterials Science and Engineering A
Volume181-182
Issue numberC
DOIs
Publication statusPublished - máj. 15 1994

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2-Propanol
Metallic glass
Propanol
metallic glasses
Dehydration
dehydration
pretreatment
surface properties
Surface properties
Dehydrogenation
Acetone
Crystallization
Titration
Metal foil
Propylene
X ray photoelectron spectroscopy
Oxygen
dehydrogenation
Catalysts
propylene

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

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title = "Dehydration of 2-propanol over CuTi metallic glasses: effect of pretreatments and reaction on the structure and surface properties",
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.",
author = "Tam{\'a}s Katona and {\'A}rp{\'a}d Moln{\'a}r and M. Bart{\'o}k",
year = "1994",
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doi = "10.1016/0921-5093(94)90809-5",
language = "English",
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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.

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