Heat transfer compositions, methods, and systems

A heat transfer system comprising:

• a compressor, a condenser, an evaporator, a sequestration material, and a heat transfer composition, wherein:
• (a) said heat transfer composition comprises a POE lubricant and a refrigerant comprising at least about 97% by weight of the following four compounds, with each compound being present in the following relative percentages:
• about 43 to about 47% by weight trifluoroiodomethane (CF3I);
• about 38 to about 42% by weight 1,1,1,2-tetrafluoropropene (HFO-1234yf);
• about 12 to about 15% by weight difluoromethane (HFC-32);
• and
• 1 to 3.5±0.2% by weight carbon dioxide (CO2);
• and
• (b) said sequestration material is comprises:
• i. activated alumina, or
• ii. a zeolite molecular sieve comprising copper, silver, lead or a combination thereof, or
• iii. an anion exchange resin, or
• iv. a moisture-removing material, or
• v. a combination of two or more of the above.