A New Type of Efficient CO₂ Adsorbent with Improved Thermal Stability: Self‐Assembled Nanohybrids with Optimized Microporosity and Gas Adsorption Functions

Abstract

A new type of efficient CO2 absorbent with improved thermal stability is synthesized via self‐assembly between 2D inorganic nanosheets and two kinds of 0D inorganic nanoclusters. In these self‐assembled nanohybrids, the nanoclusters of CdO and Cr2O3 are commonly interstratified with layered titanate nanosheets, leading to the formation of highly microporous pillared structure with increased basicity of pore wall. The co‐pillaring of basic CdO with Cr2O3 is fairly effective at increasing a proportion of micropores and reactivity for CO2 molecules and at improving the thermal stability of the resulting porous structure. Of prime importance is that the present inorganic‐pillared nanohybrids show highly efficient CO2 adsorption capacity, which is much superior to those of many other absorbents and compatible to those of CO2 adsorbing metal−organic framework (MOF) compounds. Taking into account an excellent thermal stability of the present nanohybrids, these materials are very promising CO2 adsorbents usable at elevated temperature. This is the first example of efficient CO2 adsorbent from pillared materials. The co‐pillaring of basic metal oxide nanoclusters employed in this study can provide a very powerful way of developing thermally stable CO2 adsorbents from many known pillared systems.

Lanthanide contraction effects on the structures, thermostabilities, and CO2 adsorption and separation behaviors of isostructural lanthanide–organic frameworks

“…These LOFs are comparable to those MOFs with the highest thermal stabilities. [56][57][58] Alternatively, the coordinated solvent molecules within LOFs can be removed at less than 350 °C under vacuum in replacement of a flowing nitrogen atmosphere, without decomposition of their host frameworks. The TGA curve of activated YBTC after treatment at 340 °C under vacuum for 6 h shows that there is almost no further weight loss until 540 °C (Fig.…”

Layered Nanomaterials for Environmental Remediation Applications

“…Recently, they made progresses in their titanate CO 2 -adsorption system by co-pillaring of basic inorganic nanoclusters (CdO/Cr 2 O 3 ) into interlayer of layered titanate. 67 They treated Cd 2+ and Cr 3+ solution with exfoliated titanate sheets to induce reassembled nanohybrid and the nanohybrids were thermally treated. Co-pillared CdO and Cr 2 O 3 cluster in layered titanate enabled nanohybrids to have microporous structure, high adsorbing efficiency to CO 2 gas and thermal stability.…”

Efficient Hybrid‐Type CO2 Adsorbents of Reassembled Layered Double Hydroxide 2D Nanosheets with Polyoxometalate 0D Nanoclusters

“…[25][26][27][28] Additionally, this strategy has been successfully applied to the synthesis of highly efficient CO 2 adsorbents of Cr 2 O 3 /CdOlayered titanate nanohybrids. [29] Yet we are aware of no reports detailing the synthesis of efficient LDH-based hybrid CO 2 adsorbents using such an exfoliation-reassembling reaction.…”