Institute of Chemical Process Fundamentals

Latest additions:
2019-11-25
10:16
Směsné oxidy Co-Mn-Al promotované K pro přímý rozklad NO: příprava a vlastnosti.
Jirátová, Květa ; Pacultová, K. ; Balabánová, Jana ; Karásková, K. ; Klegová, A. ; Bílková, T. ; Jandová, Věra ; Koštejn, Martin ; Martaus, A. ; Kotarba, A. ; Obalová, L.
Katalyzátory zkoumané vtéto práci byly připraveny koprecipitací dusičnanůkovů vodným roztokem K2CO3/KOH, následované promytím sraženin do různého stupně obsahu draslíku a kalcinací prekurzorů při teplotě 500 °C po dobu 4 h. Vlastnosti připravených katalyzátorů byly porovnány svlastnostmi katalyzátoru připraveného dodatečným promotováním dokonale promyté sraženiny hydrotalcitu Co-Mn-Al draselnou solí následované kalcinací při 500 °C. Před katalytickou reakcí byly kalcinovány na 700°C. Katalyzátory a jejich prekurzory byly charakterizovány následujícími měřicím itechnikami: ICP, DTG, XRD, fyzisorpce N2, FTIR, H2-TPR, CO2-TPD, XPS, a termální desorpcí alkalických kovů (SR-TAD).
Plný text: Stáhnout plný textPDF

Detailed record
2019-11-25
10:16
Complexation Properties of Aza[n]phenacene Ligands.
Váňa, Lubomír ; Žádný, Jaroslav ; Storch, Jan ; Církva, Vladimír
This work is aimed at the synthesis of new aza[n]phenacenes 2 (n = 4 or 5, Ar = phenyl or 2-pyridyl), where [njphenacenes 1 with ö-lactam ring are used as starting material. The resulting compounds are subsequenttly investigated in terms of their complexation properties with transition metals (Cu, Ni, Co, Pt, Ir) due to their potential application as photoluminescent complexes.
Plný text: Stáhnout plný textDOC

Detailed record
2019-11-25
10:16
Synthetic Pathways Leading to Novel Types of Phosphahelicenes.
Beránek, Tomáš ; Sýkora, Jan ; Žádný, Jaroslav ; Storch, Jan
The goal of this work is to explore possible synthetic ways leading to these new members of the helicene family.
Plný text: Stáhnout plný textDOC

Detailed record
2019-11-25
10:16
Visible Light Promoted Derivatizations of Helicenes.
Jakubec, Martin ; Storch, Jan ; Ghosh, I. ; König, B.
We developed new reductive and oxidative approaches to late-stage derivatization exploiting intrinsic photochemistry of helicenes with emphasis on the use of very simple and readily available bromo- and aminohelicenes.
Plný text: Stáhnout plný textDOC

Detailed record
2019-11-25
10:16

Detailed record
2019-11-25
10:15
Application of Cross-Section Filtration to Detect and Correct Errors Caused by Technical Problems in SMPS.
Wagner, Zdeněk ; Kovanic, P. ; Zíková, Naděžda ; Ondráček, Jakub ; Schwarz, Jaroslav ; Ždímal, Vladimír
The aim of the work is thus development of a robust algorithm for detection of such errors and their fully automatic correction. The algorithm should be fast so that it could be applied in real time.

Detailed record
2019-11-25
10:15
Nanoparticles Personal Exposure Measurement Using a Novel Active Personal Nanoparticle Sampler During Machining and Weldind of Nanomaterials.
Ondráčková, Lucie ; Vlčková, Lucia ; Ondráček, Jakub ; Schwarz, Jaroslav ; Ždímal, Vladimír
Development of nanotechnology has grown very rapidly in past decades. Therefore, it has become increasingly important to monitor the exposure of workers in nanoparticle-based manufacturing operations. In order to determine real personal exposure, it is advisable to take a sample within the worker’s breathing zone. To perform this task, there is not much of a choice yet, since experimental methods are still under development. Recently, a novel active personal nanoparticle sampler (PENS) has been developed, collecting both respirable mass fraction (RPM) and nanoparticles (NPs) simultaneously.
Plný text: Stáhnout plný textPDF

Detailed record
2019-11-25
10:15
Modelling of Binary Nucleation in Laminar Co - Flow Tube.
Trávníčková, Tereza ; Havlica, Jaromír ; Hrubý, Jan ; Ždímal, Vladimír
Particle nucleation is one of the important phenomena encountered in both chemical engineering and environmental studies. The Laminar Co-Flow Tube (LCFT) was designed for experimental measurement of binary and ternary nucleation of mixtures of atmospheric aerosols at laboratory conditions, most often H2SO4 + H2O + amines (MEA, TEA)/terpenes (alfa-pinene, limonene). Two models were used for mathematical modeling of momentum and mass transfer in the LFDC. 2D axisymmetric CFD model and simplified 1D analytical model. A parametric study was carried out using both models and the influence of the individual simplifications of analytical model on overall behavior of the system was discussed.

Detailed record
2019-11-25
10:15
Indoor Particles of Outdoor Origin in Depositories.
Mašková, Ludmila ; Smolík, Jiří ; Trávníčková, Tereza ; Havlica, Jaromír ; Ondráček, Jakub ; Ondráčková, Lucie
Pollution in indoor environment can cause irreversible degradation of materials stored there. The air quality in depositories housed in historical buildings depends mainly on outdoor pollution infiltrated through the building envelope. There are several strategies to control the indoor air pollution. However, most of them including reconstruction, which is problematic in historical monuments. Thus detailed information about indoor air quality and factors influencing it is needed.
Plný text: Stáhnout plný textPDF

Detailed record
2019-11-25
10:15
Thermodynamic Study of Water Activity in Atmospheric Aerosol Particles.
Asadzadeh, Behnaz ; Bendová, Magdalena ; Ždímal, Vladimír
Atmospheric aerosols are complex mixtures of various inorganic−organic compounds and play significant roles in atmospheric chemistry, earth’s climate, and global radiation budget as well as in human health. Hygroscopicity is the ability of the particle to uptake water from surrounding environment. Hygroscopicity can directly control the size distribution, chemical reactivity, and phase state of aerosol particles and thus contribute to radiative forcing on the climate system, including both the direct forcing by absorbing or scattering light and indirect forcing through activation of cloud condensation nuclei (CCN). Interactions between inorganic−organic may have a crucial impact on the hygroscopic behaviour of aerosol droplets and lead to discrepancies from ideal thermodynamic behavior. The non-ideality of mixtures in aerosol particles influences the gas-particle partitioning and affects the physical state of the condensed phase, potentially leading to liquid-liquid phase separation. Thermodynamic models are key tools to gain insight into the non-ideal behavior of organic-inorganic mixtures. By means of activity coefficients, non-ideal behaviour can be taken into account. In this study we developed a thermodynamic segment-based local composition model named NRTL (Non Random Two Liquid) to describe the aktivity coefficients of organic and inorganic aerosol particles.\n
Plný text: Stáhnout plný textPDF

Detailed record