A New Catalysis for Benzene Production from Acetylene under UHV Conditions: Sn/Pt(111) Surface Alloys

Chen Xu; John W. Peck; Bruce E. Koel

doi:10.1021/ja00055a054

A New Catalysis for Benzene Production from Acetylene under UHV Conditions: Sn/Pt(111) Surface Alloys

Chen Xu, John W. Peck, Bruce E. Koel

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Abstract

The adsorption and reaction of acetylene on Pt(l11) and the p(2×2) and (√3×√3)R30°Sn/Pt(111) surface alloys were investigated with low energy electron diffraction (LEED), temperature programmed desorption (TPD), and Auger electron spectroscopy (AES). The presence of Sn atoms at the surface of the p(2×2) and (√3×√3)R30°Sn/Pt(111) surface alloys strongly suppressed the decomposition of acetylene (C₂D₂) to deuterium and adsorbed carbon. As a result, a new reaction path is opened on the Sn/Pt(111) surface alloys—benzene formation. Besides benzene desorption, we also observed butadiene desorption, which is obviously a C₄ product of a stable intermediate in benzene production. The (√3×√3)R30°Sn/Pt(111) surface shows the highest activity and selectivity for the formation of benzene and butadiene. Following C₂D₂ adsorption on the Pt(111) surface at 110 K, LEED shows a faint (2×2) pattern. After saturation dosing of acetylene on the p(2×2)Sn/Pt(111) surface at 110 K we find a large increase in the (2×2) LEED pattern intensity. This implies that an acetylene (2×2) substructure also forms on the p(2×2)Sn/Pt(111) surface.

Original language	English (US)
Pages (from-to)	751-755
Number of pages	5
Journal	Journal of the American Chemical Society
Volume	115
Issue number	2
DOIs	https://doi.org/10.1021/ja00055a054
State	Published - Jan 1 1993
Externally published	Yes

All Science Journal Classification (ASJC) codes

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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10.1021/ja00055a054

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title = "A New Catalysis for Benzene Production from Acetylene under UHV Conditions: Sn/Pt(111) Surface Alloys",

abstract = "The adsorption and reaction of acetylene on Pt(l11) and the p(2×2) and (√3×√3)R30°Sn/Pt(111) surface alloys were investigated with low energy electron diffraction (LEED), temperature programmed desorption (TPD), and Auger electron spectroscopy (AES). The presence of Sn atoms at the surface of the p(2×2) and (√3×√3)R30°Sn/Pt(111) surface alloys strongly suppressed the decomposition of acetylene (C2D2) to deuterium and adsorbed carbon. As a result, a new reaction path is opened on the Sn/Pt(111) surface alloys—benzene formation. Besides benzene desorption, we also observed butadiene desorption, which is obviously a C4 product of a stable intermediate in benzene production. The (√3×√3)R30°Sn/Pt(111) surface shows the highest activity and selectivity for the formation of benzene and butadiene. Following C2D2 adsorption on the Pt(111) surface at 110 K, LEED shows a faint (2×2) pattern. After saturation dosing of acetylene on the p(2×2)Sn/Pt(111) surface at 110 K we find a large increase in the (2×2) LEED pattern intensity. This implies that an acetylene (2×2) substructure also forms on the p(2×2)Sn/Pt(111) surface.",

author = "Chen Xu and Peck, {John W.} and Koel, {Bruce E.}",

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N2 - The adsorption and reaction of acetylene on Pt(l11) and the p(2×2) and (√3×√3)R30°Sn/Pt(111) surface alloys were investigated with low energy electron diffraction (LEED), temperature programmed desorption (TPD), and Auger electron spectroscopy (AES). The presence of Sn atoms at the surface of the p(2×2) and (√3×√3)R30°Sn/Pt(111) surface alloys strongly suppressed the decomposition of acetylene (C2D2) to deuterium and adsorbed carbon. As a result, a new reaction path is opened on the Sn/Pt(111) surface alloys—benzene formation. Besides benzene desorption, we also observed butadiene desorption, which is obviously a C4 product of a stable intermediate in benzene production. The (√3×√3)R30°Sn/Pt(111) surface shows the highest activity and selectivity for the formation of benzene and butadiene. Following C2D2 adsorption on the Pt(111) surface at 110 K, LEED shows a faint (2×2) pattern. After saturation dosing of acetylene on the p(2×2)Sn/Pt(111) surface at 110 K we find a large increase in the (2×2) LEED pattern intensity. This implies that an acetylene (2×2) substructure also forms on the p(2×2)Sn/Pt(111) surface.

AB - The adsorption and reaction of acetylene on Pt(l11) and the p(2×2) and (√3×√3)R30°Sn/Pt(111) surface alloys were investigated with low energy electron diffraction (LEED), temperature programmed desorption (TPD), and Auger electron spectroscopy (AES). The presence of Sn atoms at the surface of the p(2×2) and (√3×√3)R30°Sn/Pt(111) surface alloys strongly suppressed the decomposition of acetylene (C2D2) to deuterium and adsorbed carbon. As a result, a new reaction path is opened on the Sn/Pt(111) surface alloys—benzene formation. Besides benzene desorption, we also observed butadiene desorption, which is obviously a C4 product of a stable intermediate in benzene production. The (√3×√3)R30°Sn/Pt(111) surface shows the highest activity and selectivity for the formation of benzene and butadiene. Following C2D2 adsorption on the Pt(111) surface at 110 K, LEED shows a faint (2×2) pattern. After saturation dosing of acetylene on the p(2×2)Sn/Pt(111) surface at 110 K we find a large increase in the (2×2) LEED pattern intensity. This implies that an acetylene (2×2) substructure also forms on the p(2×2)Sn/Pt(111) surface.

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A New Catalysis for Benzene Production from Acetylene under UHV Conditions: Sn/Pt(111) Surface Alloys

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