Hydrophilic porous materials are recognized as very promising materials for water-sorption-based energy storage and transformation. In this study, a porous, zeolite-like aluminophosphate with LTA (Linde Type A) topology is inspected as an energy-storage material. The study is motivated by the material's high predicted pore volume. According to sorption and calorimetric tests, the aluminophosphate outperforms all other zeolite-like and metal-organic porous materials tested so far. It adsorbs water in an extremely narrow relative-pressure interval (0.10 ( p/p0 ( 0.15) and exhibits superior water uptake (0.42 g g−1) and energy-storage capacity (527 kW h m−3). It also shows remarkable cycling stability; after 40 cycles of adsorption/desorption its capacity drops by less than 2%. Desorption temperature for this material, which is one of crucial parameters in applications, is lower from desorption temperatures of other tested materials by 10–15 °C. Furthermore, its heat-pump performance is very high, allowing efficient cooling in demanding conditions (with cooling power up to 350 kW h m−3 even at 30 °C temperature difference between evaporator and environment). On the microscopic scale, sorption mechanism in AlPO4-LTA is elucidated by X-ray diffraction, nuclear magnetic resonance measurements, and first-principles calculations. In this aluminophosphate, energy is stored predominately in hydrogen-bonded network of water molecules within the pores.
COBISS.SI-ID: 6070810
The method is based on nuclear magnetic resonance measurement of spin-diffusion rates and modeling of distributions of organic linkers within metal-organic frameworks. The transfer rate of polarization of the various organic molecules, or functional groups on the framework on the one hand, is measured by a series of two-dimensional NMR experiments, and on the other hand, it is calculated for each model of the distribution of these molecules and functional groups in the particle. Comparison between calculation and measurement tells you what is the actual spatial distribution of the material. It can distinguish between the cases, in which different linkers form domains, and cases, in which different linkers are uniformly distributed throughout the materials. This unique tool can be employed also for studying other heterogeneous or spatially disordered materials, not only metal-organic framework materials with a variety of organic molecules or functional groups.
COBISS.SI-ID: 5735962
HKUST-1(Cu) and MOF-5(Zn)@polyHIPE hybrid materials were prepared using a metal salt-free technique, wherein metal–organic frameworks were in situ generated from the CuO- and ZnO-nanoparticles through secondary recrystallization. The solid-to-MOF transformation has proven to be a feasible and effective technique for preparing MOF@polyHIPE hybrid materials with a high MOF content of more than 75 wt%. The MOF phase within the hybrid polyHIPEs as disclosed herein exhibits superior micropore accessibility, structure hydrostability and durable CO2 adsorption capacity under humid conditions, not achievable with any of the previously reported methods.
COBISS.SI-ID: 6072090
We developed an innovative procedure for synthesizing highly efficient composite TiO2-SiO2 photocatalyst using colloidal TiO2 product from Cinkarna Celje and porous SiO2. The composite photocatalyst is prepared in the form of a highly mechanically stable film suitable for built-in photocatalytic filters for air-cleaning devices. It was shown that by using the composite TiO2-SiO2 product, the efficiency of degrading these pollutants increases significantly compared with the various forms of commercially available pure TiO2 products.
COBISS.SI-ID: 5823258
We have developed MOF precursor MIL-77(Ni) for in situ generation of Ni nanoparticles with high hydrodeoxygenation activity and efficiency for conversion of wood-derived oil into the polar and non-polar phase with a significantly lower viscosity and oxygen content. The research achievement represents a key step in the design of catalysts for the sustainable conversion of biomass to fuels and chemicals in biorefineries.
COBISS.SI-ID: 5667866