[The activation and decomposition of alkanes on group VIII transition metal surfaces: Dynamics, kinetics and spectroscopy]. Progress report

Technical Report · Mon Dec 31 04:00:00 EST 1990

DOI:https://doi.org/10.2172/10128607· OSTI ID:10128607

Weinberg, W H

Significant progress has been achieved in a number of areas with the support of this Department of Energy grant which began on July 1, 1989. We have quantified experimentally the kinetics of the initial (low-coverage) alkane activation reaction, i.e., alkane {yields} alkyl + hydrogen adatom, for the following systems: (1) C{sub 2}H{sub 6} on Ir(110)-(1{times}2), and (2) CH{sub 4}, CD{sub 4}, C{sub 2}H{sub 6} and C{sub 2}D{sub 6} on Pt(110)-(1{times}2). In addition, we have employed dynamic Monte Carlo simulations to study two important aspects of surface reactivity, namely, reactant segregation during a steady-state surface reaction, and the compensation effect in a transient surface reaction. Experimentally determined values of the initial adsorption probability of ethane on Ir(110)(1{times}2) were employed to probe the dynamics of the interaction. Experimentally determined values of the initial trapping probability {zeta}{sub 0} of ethane into a physically adsorbed state at T{sub s} = 77 K as a function of E{sub i} and {Theta}{sub i} and experimentally determined values of the initial probability of dissociative chemisorption P{sub r} as a function of E{sub i}, {Theta}{sub i} and T{sub s} were obtained.

• Research Organization: California Univ., Santa Barbara, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG03-89ER14048
• OSTI ID: 10128607
• Report Number(s): DOE/ER/14048--T2; ON: DE92009477
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201
ALKANES
CHEMICAL ACTIVATION
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
CHEMISORPTION
HABIT PLANES
IRIDIUM
LABELLED COMPOUNDS
METHANE
MONTE CARLO METHOD
PHYSICAL PROPERTIES
PLATINUM
PLATINUM METALS
PROGRESS REPORT
SORPTIVE PROPERTIES
TEMPERATURE DEPENDENCE