A new catalysis for benzene production from acetylene under UHV conditions: Sn/Pt(111) surface alloys

Journal Article · Wed Jan 27 04:00:00 EST 1993 · Journal of the American Chemical Society; (United States)

OSTI ID:6539172

Xu, Chen; Peck, J W; Koel, B E ^[1]

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1. Univ. of Southern California, Los Angeles (United States)

The adsorption and reaction of acetylene on Pt(111) and the p(2[times]2) and ([radical]3[times][radical]3)R30[degrees]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[times]2) and ([radical]3[times][radical]3)R30[degrees]Sn/Pt(111) surface alloys strongly suppressed the decomposition of acetylene (C[sub 2]D[sub 2]) 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, the authors also observed butadiene desorption, which is obviously a C[sub 4] product of a stable intermediate in benzene production. The ([radical]3[times][radical]3)R30[degrees]Sn/Pt(111) surface shows the highest activity and selectivity for the formation of benzene and butadiene. Following C[sub 2]D[sub 2] adsorption on the Pt(111) surface at 110 K, LEED shows a faint (2[times]2) pattern. After saturation dosing of acetylene on the p(2[times]2)Sn/Pt(111) surface at 110 K they find a large increase in the (2[times]2) LEED pattern intensity. This implies that an acetylene (2[times]2) substructure also forms on the p(2[times]2)Sn/Pt(111) surface. 30 refs., 6 figs.

• OSTI ID: 6539172
• Journal Information: Journal of the American Chemical Society; (United States), Journal Name: Journal of the American Chemical Society; (United States) Vol. 115:2; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACETYLENE
ADSORPTION
ALKYNES
ALLOYS
AROMATICS
AUGER ELECTRON SPECTROSCOPY
BENZENE
BUTADIENE
CARBON
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COHERENT SCATTERING
DECOMPOSITION
DESORPTION
DEUTERIUM COMPOUNDS
DIENES
DIFFRACTION
ELECTRON DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
HYDROCARBONS
HYDROGEN COMPOUNDS
MILLER INDICES
NONMETALS
ORGANIC COMPOUNDS
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
POLYENES
RADICALS
REACTION INTERMEDIATES
SCATTERING
SORPTION
SPECTROSCOPY
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TIN ALLOYS
ULTRAHIGH VACUUM