Catalysis at experimentally designed surfaces: n-Butane hydrogenolysis at Sn/Group VIII surface alloys

Conference · Tue Dec 31 23:00:00 EST 1991

DOI:https://doi.org/10.1016/S0167-2991(08)64488-2· OSTI ID:5523965

Logan, A D; Paffett, M T

Bimetallic {radical}3x{radical}3R30{degrees}-Sn/M(111) (M=Ni, Pt) surface alloys have been prepared in an ultrahigh vacuum system and used in model moderate pressure (1--200 Torr) catalytic reactions. Hydrogenolysis of n-butane (H{sub 2}/n-C4=20) has been used to characterize the effects of ordered bimetallic ensembles relative to those available at the respective (111) surfaces. The effect of alloying Sn into the Ni(111) surface produced an overall lowering of the catalytic reactivity nearly equal to the number of Ni surface sites lost upon producing the {radical}3x{radical}3R30{degrees} surface alloy. In addition, the overall rate of hydrogenolysis of n-butane at the {radical}3x{radical}R30{degrees}-Sn/Pt(111) surface alloy was also found to have decreased (although not in proportion to the loss of total Pt atoms). Catalytic deactivation due to carbon buildup was observed to decrease significantly at both of the ordered {radical}3x{radical}3R30{degrees}-Sn/M(111) surface alloys under reaction conditions.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5523965
• Report Number(s): LA-UR-92-40; CONF-920701--1; ON: DE92007424
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKANES
ALLOYS
ARRHENIUS EQUATION
AUGER ELECTRON SPECTROSCOPY
BUTANE
CATALYTIC EFFECTS
CHEMICAL REACTIONS
COHERENT SCATTERING
DIFFRACTION
ELECTRON DIFFRACTION
ELECTRON SPECTROSCOPY
EQUATIONS
HABIT PLANES
HYDROCARBONS
HYDROGENATION
NICKEL ALLOYS
NICKEL BASE ALLOYS
ORGANIC COMPOUNDS
PLATINUM ALLOYS
PLATINUM BASE ALLOYS
PLATINUM METAL ALLOYS
SCATTERING
SPECTROSCOPY
SURFACES
TIN ALLOYS