Robust metal-organic frameworks for dry and wet biogas upgrading

Water Bridges Substitute for Defects in Amine-Functionalized UiO-66, Boosting CO2 Adsorption

“…Likewise, Li et al noted enhanced CO 2 uptake for MIL-100­(Fe) and reduced CO 2 uptake for MIL-101­(Cr) in the presence of water . When examining MOFs for biogas capture, Chidambaram et al presented an aluminum MOF that maintained its CO 2 adsorption capacity in the presence of water, which was attributed to a hydrophobic CO 2 -binding site …”

“…10 When examining MOFs for biogas capture, Chidambaram et al presented an aluminum MOF that maintained its CO 2 adsorption capacity in the presence of water, which was attributed to a hydrophobic CO 2 -binding site. 46 Fetisov et al used molecular simulations and examined the impact of dative bonding on adsorbate molecules onto coordinatively unsaturated metal sites to show the limitations of the ideal adsorbed solution theory (IAST) to predict CO 2 / N 2 and H 2 O/CO 2 separations on Mg-MOF-74. 47 Likewise, Erucar and Keskin et al identified leading MOF candidates for CO 2 /N 2 separation out of 54,808 MOF materials and examined the impact of water on the performance of these materials.…”

From renewable energy to sustainable protein sources: Advancement, challenges, and future roadmaps

“…The mechanisms of CO 2 adsorption from streams are typically accomplished by different adsorption equilibrium, adsorption kinetics or molecular size. Widely-used adsorbents include activated carbon, metal oxides, gel materials, zeolites, and metal organic frameworks (MOF) [226,227]. Compared to amine-scrubbing, CO 2 adsorption takes advantages of a low energy penalty for CO 2 desorption, but suffers from a high-pressure feed gas.…”

Alternative Materials for the Enrichment of Biogas with Methane

“…In this paper we focus on adsorption technologies, especially materials (in this case, alternative ones), for which proper selection is a key factor in the successful use of this technology in biogas upgrading and cleaning [22]. Typical adsorbents used for the adsorptive separation of methane from carbon dioxide are usually carbon materials [23], such as activated carbons [24,25], carbon molecular sieves [26], and the increasingly popular MOFs [27,28], as well as their modified forms [29]. As waste materials, chars obtained from the pyrolysis of rubber tires have great potential [30], the same as adsorbents produced from biomass [31][32][33].…”

“…Taking into consideration the adsorption-based process, especially pressure swing adsorption (PSA), as a method to enrich methane from biogas [52], a useful tool to check the viability of such a separation is the performance of a breakthrough curve experiment [12,27]. In this way, it is possible to evaluate the performance of potential adsorbent materials and their use for upgrading biogas for transport applications or to satisfy pipeline specifications, naturally, without complicated full adsorption-desorption PSA cycles.…”