cелективність | Academic Journals and Conferences

n-Hexane Hydroisomerization on Ni-HMFI Zeolites of Different Preparation Methods

A range of bifunctional catalysts based on MFI zeolite with 1.5 wt. % of nickel was synthesized. The aim of this research was to compare the performance of Ni-HZSM-5 zeolites of different methods of nickel loading (ion exchange and impregnation) in n-hexane hydroisomerization. Samples were characterized by XRD, TEM, and low-temperature nitrogen adsorption/desorption. It is stated that using ion exchange, it is more difficult to control nickel content in the samples.

Investigation of n-Butane Conversion on Pd, Rh, Ru Catalysts Supported by Al2O3 and SiO2

This study explored the dehydrogenation of n-butane using Pd, Rh, and Ru catalysts on aluminum and silicon oxide supports. Aluminum oxide (Al₂O₃) showed superior conversion of n-butane, especially with 1% Pd/γAl₂O₃, yielding 31% target alkenes. This catalyst offers potential for scaling up n-butane dehydrogenation technology.

DFT Study of Some Copper Complexes and Their Detection Limit

A theoretical investigation was probed to shed light on the correlation between low detection limit (LOD) in AdSV technique and metal trace complexes stability energy. The study was conducted by means of DFT calculations of copper traces complexation by using three different organic molecules as chelating agents, such as: morin, red pyrogallol and thymolphtalexone. The quantum chemistry calculations were carried out at the B3LYP/6-31G(d) level implemented in Gaussian 09 program package.

n-Hexane Isomerization Over Nickel-Containing Mordenite Zeolite

Nickel-containing mordenite samples were synthesized by impregnation from aqua's solution of nickel nitrate. Porous and catalytic characteristics of the catalysts were studied by means of low temperature nitrogen adsorption/desorption and micropulse n-hexane isomerisation. The maximum isomer yields are 10-12 wt % for 1-5 wt % Ni content at 523–573 K.

DFT Theoretical Study of Some Thiosemicarbazide Derivatives with Copper

A theoretical study of the detection limit concept of copper traces in aqueous solution by using two thiosemicarbazides derivatives as ligands: 4-ethyl-3-thiosemicarbazide and thiosemicarbazide has been thoroughly investigated. The study was carried out experimentally by adsorptive stripping voltammetry.

The Influence of on-load Tap-changing Device on the Identification of Winding Short Circuits in Power Transformer

The investigation of the influence of on-load tap-changing device on the algorithm of identification of winding short circuits in multi-winding power transformers was conducted.

The Reaction of Oleic Acid with a Mixture of Ethanolamines

Regularities of the reaction of oleic acid with a mixture of ethanolamines have been investigated under non-stationary conditions in the presence of H-form of cation-exchange resin KU-2-8 as a catalyst. The effect of a ratio between reagents and the catalyst on the acid conversion, selectivity and products yield has been determined. N-acylation of mono- and diethanolamines by an oleic acid was found to be more intensive compared with esterification of hydroxy groups of ethanolamine.