Search results for: Jerzy Walendziewski

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Właściwości sorpcyjne karbonizatów z pozostałości węglowej z pirolizy opon

Cezary Dębek, Jerzy Walendziewski

Elastomery > 2020 > T. 24, nr 2 > 63--77

Scharakteryzowano właściwości strukturalne dwóch prób węgla popirolitycznego otrzymanego w wyniku niskotemperaturowej pirolizy opon samochodowych. Próby węgli popirolitycznych różniły się warunkami prowadzenia procesu pirolizy. Materiał węglowy z pirolizy opon poddano karbonizacji i zbadano zmiany strukturalne oraz oceniono ich zdolności sorpcyjne w stosunku do związków modelowych: benzenu, p‑chlorofenolu,...

article

The Properties and Activity of TiO₂/beta‐SiC Nanocomposites in Organic Dyes Photodegradation

Katarzyna Pstrowska, Bartłomiej Maciej Szyja, Hanna Czapor‐Irzabek, Adam Kiersnowski, more

Photochemistry and Photobiology > 93 > 2 > 558 - 568

The TiO₂/beta‐SiC nanocomposites containing 0–25 wt. % of beta‐SiC were synthesized by the sol‐gel method and tested in the photodegradation of methylene blue and methyl orange water solutions. With the increase in SiC content, only a slight decrease in energy band gap was observed (3.19–3.12 eV), together with significant increase in the surface area of the catalysts (42.7–80.4 m² g⁻¹). In the synthesized...

article

Hydrorefining of oil from pyrolysis of whole tyres for passenger cars and vans

Cezary Dębek, Jerzy Walendziewski

Fuel > 2015 > 159 > C > 659-665

In the pilot plant for pyrolysis of whole tyres for passenger cars and vans we received a liquid product, hydrocarbon fraction known as pyrolytic oil, two solid products, i.e. pyrolytic carbon, scrap metal cord and gaseous mixture of hydrocarbons. The main goal of the research was to determine susceptibility of the obtained pyrolytic oils to hydrorefining. The analysis showed that hydrorefining process,...

article

Hydrorefining of oil from rapeseed cake pyrolysis over NiMo/Al2O3 catalyst

Katarzyna Pstrowska, Jerzy Walendziewski, Marek Stolarski

Fuel Processing Technology > 2014 > 128 > C > 191-198

Bio-oil from rapeseed cake pyrolysis, bio-oil fraction boiling over 120°C and bio-oil blended with light gas oil fraction were submitted to the hydrorefining studies. The usability of NiMo/Al₂O₃ catalyst for pyrolytic oil hydrorefining was tested at the following parameters: temperature (290–350°C), LHSV (0.5–2.0h⁻¹) and 3MPa hydrogen pressure. The influence of hydrorefining parameters on the physicochemical...

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Hydroprocessing of rapeseed pyrolysis bio-oil over NiMo/Al2O3 catalyst

Katarzyna Pstrowska, Jerzy Walendziewski, Rafał Łużny, Marek Stolarski

Catalysis Today > 2014 > 223 > Complete > 54-65

Raw rapeseed bio-oil, bio-oil fraction boiling at the temperature over 120°C and bio-oil blend with non-desulfurized light gas oil fraction were submitted to hydrorefining studies. In this experiment use of NiMo/Al ₂ O ₃ as the selected catalyst for pyrolysis oil hydrorefining was tested at mild process parameter sets: temperature (260–350°C), LHSV (0.5–2.0h ⁻¹ ) and 3MPa hydrogen...

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Hydroprocesssing of light gas oil — rape oil mixtures

Jerzy Walendziewski, Marek Stolarski, Rafał Łużny, Bartłomiej Klimek

Fuel Processing Technology > 2009 > 90 > 5 > 686-691

Two series of experiments of hydroprocessing of light gas oil - rape oil mixtures were carried out. The reactor feed was composed of raw material: first series — 10 wt.% rape oil and 90 wt.% of diesel oil; second series — 20 wt.% rape oil and 80 wt.% of diesel oil.Hydroprocessing of both mixtures was performed with the same parameter sets, temperature (320, 350 and 380 °C), hydrogen pressure 3 and...

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The influence of preparation method on the physicochemical properties of titania–silica aerogels: Part two

Krzysztof Brodzik, Jerzy Walendziewski, Marek Stolarski, Luc Ginneken, more

Journal of Porous Materials > 2008 > 15 > 5 > 541-549

Titania–silica aerogels with different titania content were prepared. Four preparation methods differing mainly in approach to precursors hydrolysis were applied, while only three of them allowed total hydrolysis of silica precursor before titania precursor was added. The preparation of mixed products of titania and silica hydrolysis precursors containing gels was followed by high temperature supercritical...

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Application of combustible wastes for the alternative fuels production

Marek Kułażyński, Andrzej Surma, Jerzy Walendziewski

Polish Journal of Chemical Technology > 2007 > 9 > 4 > 43-47

The information on the quantity of various types of combustible wastes registered in the Lower Silesia Marshal Office over the 2003 - 2005 years (waste codes - 02, 03, 04, 07, 12, 15, 16, 17, 19 and 20) was collected and then the quantities of individual wastes from different sources were summarized depending on the waste sort i.e. waste paper (cellulose), plastics, timber, textiles and rubber. The...

article

Photodegradation of organic compounds in water

Krzysztof Brodzik, Jerzy Walendziewski, Marek Stolarski

Polish Journal of Chemical Technology > 2007 > 9 > 3 > 130-133

The application of photocatalytic processes for the decontamination treatment of polluted water has inspired very extensive studies. Titanium dioxide with its large band gap energy and appropriate redox potential was found as one of the most promising semiconductors for the photodegradation of pollutants in the water as well as in gas phase. The titania-silica aerogels obtained by a simple co-hydrolysis...

article

Optimization of an active phase composition in the low-temperature nitric oxide reduction catalyst

Marek Kułażyński, Krystyna Bratek, Jerzy Walendziewski

Polish Journal of Chemical Technology > 2007 > 9 > 3 > 33-37

In the first research studies series a selection of the quantitative composition of catalyst active phase composition (iron, copper and manganese) deposited on mineral-carbon support was carried out. It was found on the basis of the selection studies series that the best results were attained when copper and manganese were used as catalyst components. The quantitative composition of the denitrogention...

article

The influence of preparation method on the physicochemical properties of titania–silica aerogels

Krzysztof Brodzik, Jerzy Walendziewski, Marek Stolarski, Luc Ginneken, more

Journal of Porous Materials > 2007 > 14 > 2 > 219-226

A series of titania–silica aerogels with different compositions were prepared using four different preparation methods. The preparation steps were followed by a high temperature supercritical drying (HTSCD). It was found that application of ethanol and 2-propanol as the solvents for the titania precursor (with or without modification with acetyloacetone) resulted in materials with BET surface area...

article

Continuous flow cracking of waste plastics

Jerzy Walendziewski

Fuel Processing Technology > 2005 > 86 > 12-13 > 1265-1278

Experiments of waste polymers cracking in a continuous flow tube reactor were carried out. The main components of the reactor unit were a screw extruder as a waste plastics feeder and a tube cracking reactor equipped with an internal screw mixer. Cracking process was realized at the temperature range 420–480 °C and raw material feeding rate from 0.3 up to 2.4 kg/h.The principal process products, gaseous...

article

Photocatalytic Water Splitting over Pt−TiO ₂ in the Presence of Sacrificial Reagents

Anna Galińska, Jerzy Walendziewski

Energy & Fuels > 2005 > 19 > 3 > 1143 - 1147

article

Selectivity of platinum-zirconia catalysts in n-paraffins hydroisomerisation process

Jerzy Walendziewski, Barbara Pniak, Bożena Malinowska

Chemical Engineering Journal > 2003 > 95 > 1-3 > 113-121

Tungstated and sulphated zirconium hydroxides produced by MEL Chemicals were used as a raw material for preparation of n-paraffins hydroisomerisation catalysts. The preparation involved forming of zirconium hydroxides with peptised aluminium hydroxide, thermal treatment and impregnation of the obtained supports with platinum hexachloric acid solution. The obtained catalysts, 0.5wt.% Pt/(SO ₄ ...

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Synthesis, physicochemical properties and hydroisomerization activity of SAPO-11 based catalysts

Jerzy Walendziewski, Barbara Pniak

Applied Catalysis A, General > 2003 > 250 > 1 > 39-47

A series of silicoaluminophosphate (SAPO)-11 molecular sieve samples by using various raw materials and process parameters was prepared. Two of the selected SAPO structure materials were formed in extrudate supports, impregnated with platinum acid solution, thermally treated and tested in hydroisomerization process of so-called ''cetane fraction'' (mixture of n-C ₁ ₃ -n-C ₂ ₀ ...

article

Engine fuel derived from waste plastics by thermal treatment

Jerzy Walendziewski

Fuel > 2002 > 81 > 4 > 473-481

Two series of experiments of waste polymers cracking were carried out. The first series of polymer cracking experiments was carried out in a glass reactor of 0.5dm ³ volume at atmospheric pressure and in a temperature range 350-420 ^o C, the second one in autoclaves under hydrogen pressure (~3-5MPa) in the temperature range 380-440 ^o C. The influence of cracking parameters,...

article

Thermal and catalytic conversion of waste polyolefines

Jerzy Walendziewski, Mieczysław Steininger

Catalysis Today > 2001 > 65 > 2-4 > 323-330

Waste samples of polyethylene and polystyrene were cracked thermally or in the presence of catalyst and hydrogen in closed autoclaves. The obtained products were submitted to analysis, unsaturated hydrocarbons in gasoline and diesel fuel range boiling were hydrogenated over platinum catalyst. It was stated that the optimum thermal cracking temperature of waste polyolefines is 410–430°C, in the case...

article

Silica - Titania Support for HVOC's Combustion Catalysts

Jerzy Walendziewski, Marek Kulażyński, Janusz Trawczyński

Reaction Kinetics, Mechanisms and Catalysis > 2001 > 73 > 2 > 341-348

Preparation of support series for catalysts of combustion of halogenated volatile organic compounds (H-VOC's) was carried out. It was stated that all they allow preparing active catalysts however their main drawback is the lack of hardness against products of H-VOC's combustion e.g. hydrogen chloride and chlorine. Laboratory tests showed that titania and silica - titania supports were characterized...

article

Synthesis and Properties of Alumina Aerogels (II)

Jerzy Walendziewski, Marek Stolarski

Reaction Kinetics, Mechanisms and Catalysis > 2000 > 71 > 2 > 201-207

Synthesis of alumina aerogels was carried out by hydrolysis of aluminium isopropanolate and butanolate in benzene, methanol and isopropanol solutions as components of support precursors followed by gelation, drying under supercritical conditions and calcination. The influence of the type of precursor and solvent, synthesis temperature as well as drying and calcination temperature on bulk density,...

article

Skeletal isomerization of 1-pentene

Jerzy Walendziewski, Barbara Pniak

Reaction Kinetics and Catalysis Letters > 1996 > 58 > 2 > 359-365

Series of ZSM-5 and Y zeolite catalysts have been prepared. Zeolites were submitted to ion exchange, drying, formation with 50 wt.% of aluminium hydroxide as a binder and then to final thermal treatment. Determination of catalysts activity in 1-pentene isomerization reaction was carried out in the temperature range of 175 - 325°C. The highest activity in isomerization reaction was attained in the...

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INFONA - science communication portal

Search results for: Jerzy Walendziewski

Właściwości sorpcyjne karbonizatów z pozostałości węglowej z pirolizy opon

The Properties and Activity of TiO₂/beta‐SiC Nanocomposites in Organic Dyes Photodegradation

Hydrorefining of oil from pyrolysis of whole tyres for passenger cars and vans

Hydrorefining of oil from rapeseed cake pyrolysis over NiMo/Al2O3 catalyst

Hydroprocessing of rapeseed pyrolysis bio-oil over NiMo/Al2O3 catalyst

Hydroprocesssing of light gas oil — rape oil mixtures

The influence of preparation method on the physicochemical properties of titania–silica aerogels: Part two

Application of combustible wastes for the alternative fuels production

Photodegradation of organic compounds in water

Optimization of an active phase composition in the low-temperature nitric oxide reduction catalyst

The influence of preparation method on the physicochemical properties of titania–silica aerogels

Continuous flow cracking of waste plastics

Photocatalytic Water Splitting over Pt−TiO ₂ in the Presence of Sacrificial Reagents

Selectivity of platinum-zirconia catalysts in n-paraffins hydroisomerisation process

Synthesis, physicochemical properties and hydroisomerization activity of SAPO-11 based catalysts

Engine fuel derived from waste plastics by thermal treatment

Thermal and catalytic conversion of waste polyolefines

Silica - Titania Support for HVOC's Combustion Catalysts

Synthesis and Properties of Alumina Aerogels (II)

Skeletal isomerization of 1-pentene

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