Effects of polydimethylsiloxane coating of Ni-MOF-74 on CH4 storage

• Published in: The Korean journal of chemical engineering Vol. 35; no. 7; pp. 1542 - 1546
• Main Authors: Lee, Yu-Ri, Cho, Sung-Min, Ahn, Wha-Seung
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-07-2018; Springer Nature B.V; 한국화학공학회
• Subjects: Biotechnology; Catalysis; Chemistry; Chemistry and Materials Science; Coating effects; Electronic; Exposure; Industrial Chemistry/Chemical Engineering; Inorganic; Materials (Organic; Materials Science; Methane; Moisture; Polydimethylsiloxane; Relative humidity; Silicone resins; Storage capacity; Surface area; Thin Films; Vapor deposition; 화학공학; Methane Storage; Ni-MOF-74; Moisture Stability; Polydimethylsiloxane
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-018-0049-1

Ni-MOF-74 was prepared by microwave heating and coated with polydimethylsiloxane (PDMS) via vapor deposition. Both the pristine and the PDMS-coated Ni-MOF-74 samples were exposed to moisture in air (relative humidity of 75%) for different periods of time, and their methane storage capacities under 35 bar conditions were measured. The pristine sample had a Brunauer-Emmett-Teller (S
BET
) surface area of 1,050 m
2
·g
−1
, with a CH
4
uptake capacity of 113.8 mg·g
−1
at 300 K and 35 bar. After exposure to moisture for seven days, the BET surface area and CH
4
uptake capacity declined drastically, whereas the PDMS-coated sample maintained its original BET surface area (1,018 m
2
·g
−1
) and CH
4
uptake capacity (107.7 mg·g
−1
). After exposure to moisture in air for 30 days, however, even the PDMS-coated sample lost almost 60% of its CH
4
storage capacity. All the methane storage capacity data were linearly correlated with the BET surface areas of the Ni-MOF 74 samples.