Methane hydrates: Nucleation in microporous materials

Clathrates are well-known compounds whose low thermal stability makes them extremely rare and appreciated. Although their formation mechanism is still surrounded by many uncertainties, these ice-like structures have the potential to be an alternative for transport and storage of different gases, especially methane. For the formation of...

Maximizing Ag Utilization in High-Rate CO₂ Electrochemical Reduction with a Coordination Polymer-Mediated Gas Diffusion Electrode

We report the preparation and electrocatalytic performance of silver-containing gas diffusion electrodes (GDEs) derived from a silver coordination polymer (Ag-CP). Layer-by-layer growth of the Ag-CP onto porous supports was applied to control Ag loading. Subsequent electro-decomposition of the Ag-CP resulted in highly selective and efficient...

Consequences of secondary zeolite growth on catalytic performance in DMTO studied over DDR and CHA

Zeolites with DDR (Sigma-1 and ZSM-58) and CHA (SSZ-13) topology were synthesized by seed assisted and direct hydrothermal synthesis in order to investigate the effects of fast crystal growth on catalytic performance. Application of small amount of seeds (0.1% wt) significantly reduced synthesis time of all the studied zeolites. XRD and NH...

Temperature-Dependent Supramolecular Isomerism of Lutetium-Aminoterephthalate Metal-Organic Frameworks: Synthesis, Crystallography, and Physical Properties

Three supramolecular isomers of lutetium metal-organic framework, {Lu₂(H₂O)₄(ATA)₃·4H₂O}_n (Lu-ATA@RT), {Lu₂(H₂O)₂(C₃H₇NO)₂(ATA)₃}_n (Lu-ATA@100), and {Lu₂(C₃H<sub>7</sub...

Methanol-to-olefins process over zeolite catalysts with DDR topology: Effect of composition and structural defects on catalytic performance

A systematic study of the effect of physicochemical properties affecting catalyst deactivation, overall olefin selectivity and ethylene/propylene ratio during the methanol-to-olefins (MTO) reaction is presented for two zeolites with the DDR topology, namely Sigma-1 and ZSM-58. Both catalysts show high selectivity towards light olefins and...

Crystal structure of 2,2'-diamino-[1,1'-biphenyl]-4,4'-dicarboxylic acid dihydrate, C₁₄H₁₆N₂O₆

C₁₄H₁₆N₂O₆, triclinic, P1 (no. 2), a = 10.0254(5) Å, b = 11.2726(6) Å, c = 13.4494(7) Å, α = 111.535(2)°, β = 92.068(2)°, γ = 102.644(2)°, V = 1368.16(13) ų, Z = 4, R_gt(F) = 0.047, wR_ref(F²) = 0.133, T = 150 K.

Methanol-to-olefins process over zeolite catalysts with DDR topology: Effect of composition and structural defects on catalytic performance

A systematic study of the effect of physicochemical properties affecting catalyst deactivation, overall olefin selectivity and ethylene/propylene ratio during the methanol-to-olefins (MTO) reaction is presented for two zeolites with the DDR topology, namely Sigma-1 and ZSM-58. Both catalysts show high selectivity towards light olefins and...

Facile formation of ZIF-8 thin films on ZnO nanorods

In this work, thin films of the well-known metal–organic framework ZIF-8 were formed on zinc oxide nanorods through the reaction with 2-methyl-imidazole solution (Hmim). Deposition of a thin film of the linker solution allows the underlying zinc oxide nanorod morphology to be preserved, resulting in the facile and precise formation of...

Metal organic framework synthesis in the presence of surfactants: Towards hierarchical MOFs?

The effect of synthesis pH and H2O/EtOH molar ratio on the textural properties of different aluminium trimesate metal organic frameworks (MOFs) prepared in the presence of the well-known cationic surfactant cetyltrimethylammonium bromide (CTAB) at 120 °C was studied with the purpose of obtaining a MOF with hierarchical pore structure. Depending...

Experimental evidence of negative linear compressibility in the MIL-53 metal–organic framework family

We report a series of powder X-ray diffraction experiments performed on the soft porous crystals MIL-53(Al) and NH2-MIL-53(Al) in a diamond anvil cell under different pressurization media. Systematic refinements of the obtained powder patterns demonstrate that these materials expand along a specific direction while undergoing total volume...