Temperature-Dependent Stepwise Dissociation of Methanol on Co(0001)

Area of Science:

• Surface science
• Catalysis
• Materials science

Background:

• Understanding catalytic reaction mechanisms at the atomic level is essential for designing efficient catalysts.
• Methanol decomposition is a fundamental process in catalysis with applications in fuel production and chemical synthesis.

Purpose of the Study:

• To investigate the stepwise decomposition of methanol on a single-crystal Cobalt(0001) surface.
• To elucidate the reaction pathway and identify surface intermediates using advanced experimental and computational methods.

Main Methods:

• Utilized scanning tunneling microscopy (STM) for visualizing surface species.
• Employed infrared reflection absorption spectroscopy (IRAS) to identify molecular adsorbates.
• Performed density functional theory (DFT) calculations to complement experimental findings.

Main Results:

• Methanol dissociation initiates with O-H bond cleavage, forming methoxy and H adatoms.
• Subsequent C-H bond cleavage leads to the formation of carbon monoxide (CO).
• No intermediate species like formaldehyde (CH2O) or formyl (CHO) were detected.

Conclusions:

• The study provides a detailed atomic-level understanding of methanol decomposition on Co(0001).
• The observed reaction pathway involves direct conversion to CO without stable intermediate formation.
• Findings contribute to the rational design of cobalt-based catalysts for methanol conversion.