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Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation

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Propane and propane-water interactions: a study at cryogenic temperatures.

Jyotirmoy Ghosh¹, Annapoorani Kobuvayur Hariharan, Radha Gobinda Bhuin

¹DST Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India. pradeep@iitm.ac.in.

Physical Chemistry Chemical Physics : PCCP

|January 3, 2018

Summary

Investigating solid propane and propane-water mixtures revealed a new crystalline phase (phase I) and identified kinetics governing its transition to phase II. Water co-deposition restricts amorphous-to-crystalline phase transitions in propane.

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Area of Science:

Physical Chemistry
Surface Science
Materials Science

Background:

Understanding phase transitions in solid hydrocarbons is crucial for various scientific disciplines.
Propane-water mixtures present complex interfacial phenomena relevant to atmospheric and planetary science.
Ultrahigh vacuum conditions allow for precise investigation of surface interactions and phase behaviors.

Purpose of the Study:

To investigate the phase transition of pure solid propane.
To explore the influence of water on propane's phase behavior under ultrahigh vacuum.
To characterize novel crystalline phases and their formation kinetics.

Main Methods:

Reflection absorption infrared spectroscopy (RAIRS) was used to identify molecular structures and phases.
Temperature-programmed desorption mass spectrometry (TPD-MS) analyzed desorption profiles and phase transformations.
Controlled deposition techniques (co-deposition and sequential deposition) were employed to study propane-water interactions.

Main Results:

An unknown crystalline phase of propane (phase I) was identified at 50 K, transitioning to a known phase (phase II) with increasing temperature.
The amorphous to crystalline phase transition of propane is kinetically controlled.
Co-deposition of water and propane inhibits the phase transition, while sequential deposition (propane over water) also restricts it due to diffusional mixing.

Conclusions:

The study identified a new crystalline phase of propane and elucidated the kinetics of its phase transition.
Water's presence significantly influences propane's phase transition behavior, with deposition method being a critical factor.
Diffusional mixing in sequential deposition (water over propane) explains the restricted phase transition, offering insights into interfacial processes.