Carbon dioxide storage and sustained delivery by Cu₂(pzdc)₂L [L = dipyridyl-based ligand] pillared-layer porous coordination networks

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• 作者：Omar J. Garc¨ªa-Ricard ; Paul Meza-Morales ; Juan C. Silva-Mart¨ªnez ; Maria C. Curet-Arana ; John A. Hogan ; Arturo J. Hern¨¢ndez-Maldonado
• 关键词：Porous coordination polymers ; Metal-organic frameworks ; Pillared-layer structure ; Carbon dioxide storage ; Carbon dioxide delivery
• 刊名：Microporous and Mesoporous Materials
• 出版年：2013
• 出版时间：1 September, 2013
• 年：2013
• 卷：177
• 期：Complete
• 页码：54-58
• 全文大小：850 K

文摘

CPL-2 (Cu₂(pzdc)₂(bpy)), CPL-5 ((Cu₂(pzdc)₂(bpe)), and ZIF-8 (Zn(MeIM)₂) [pzdc = 2,3-pyrazinedicarboxylate, bpy = 4,4¡äbipyridine, bpe = 1,2-di-(4-pyridyl)-ethylene, MeIM = 2-methylimidazolate] were used to study carbon dioxide storage and delivery at low to moderate pressures. Both CPL-2 and CPL-5 showed superior performance over ZIF-8 due to better volumetric-based capacities and superior diffusion kinetics exhibited by the former metal organic frameworks. When compared with an empty vessel, the CPL-n based storage/delivery system provided as much as 500 % increase in CO₂ constant flow supply time at moderate pressures. A simplified phenomenological yet useful model was developed to predict discharge pressure decay and estimate a lumped parameter related to the molecular diffusivity. Density functional theory was also employed to shed light onto the CO₂ hysteretic adsorption process present on the CPL-n materials. Greater CO₂ binding interactions were observed near the vicinity of the copper-nodes.