Copper(I)-Catalyzed Synthesis of Nanoporous Azo-Linked Polymers: Impact of Textural Properties on Gas Storage and Selective Carbon Dioxide Capture

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• 作者：Pezhman Arab ; Mohammad Gulam Rabbani ; Ali Kemal Sekizkardes ; Timur ?slamo?lu ; Hani M. El-Kaderi
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：February 11, 2014
• 年：2014
• 卷：26
• 期：3
• 页码：1385-1392
• 全文大小：492K
• ISSN：1520-5002

文摘

A new facile method for synthesis of porous azo-linked polymers (ALPs) is reported. The synthesis of ALPs was accomplished by homocoupling of aniline-like building units in the presence of copper(I) bromide and pyridine. The resulting ALPs exhibit high surface areas (SA_BET = 862鈥?235 m² g^鈥?), high physiochemical stability, and considerable gas storage capacity especially at high-pressure settings. Under low pressure conditions, ALPs have remarkable CO₂ uptake (up to 5.37 mmol g^鈥? at 273 K and 1 bar), as well as moderate CO₂/N₂ (29鈥?3) and CO₂/CH₄ (6鈥?) selectivity. Low pressure gas uptake experiments were used to calculate the binding affinities of small gas molecules and revealed that ALPs have high heats of adsorption for hydrogen (7.5鈥? kJ mol^鈥?), methane (18鈥?1 kJ mol^鈥?), and carbon dioxide (28鈥?0 kJ mol^鈥?). Under high pressure conditions, the best performing polymer, ALP-1, stores significant amounts of H₂ (24 g L^鈥?, 77 K/70 bar), CH₄ (67 g L^鈥?, 298 K/70 bar), and CO₂ (304 g L^鈥?, 298 K/40 bar).