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1

Monolithic La1-xPtxMnO3 and LaMn1-xPtxO3 perovskite catalysts for the oxidation of methane and carbon oxide

Kucharczyk B., Zabrzeski J.

Environment Protection Engineering

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2008

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Vol. 34, nr 4

75-80

EN

The substitution of 0.1-0.2 mol of lanthanum in LaMnO3 by platinum enhances the activity of the perovskite in CO oxidation, and the La0.9Pt0.1MnO3-based catalyst was found to be most active in this process. When the CO oxidation involves the temperatures higher than 270 ?C, the catalysts based on LaMn0.9Pt0.1O3, La0.8Pt0.2MnO3 and La0.85Pt0.15MnO3 perovskites do not differ in activity. In CH4 combustion, the La0.9Pt0.1MnO3 and LaMn0.9Pt0.1O3 catalysts display a higher activity than the LaMnO3 catalyst does. When the Pt content in LaMnO3 is higher than 0.1, its activity in CH4 combustion and the resistance to thermal shocks decrease. When some part of La in the LaMnO3 perovskite is substituted by Pt, the specific surface area of the perovskite decreases from 8.6 m2/g (LaMnO3) to 3.1 m2/g (La0.8Pt0.2MnO3).

PL

eśli w perowskicie LaMnO3 zastąpić od 0,1 do 0,2 mola lantanu platyną, to zwiększa się aktywność tego perowskitu w utlenianiu CO. Najwyższą aktywność w utlenianiu wykazuje katalizator z perowskitem La0,9Pt0,1MnO3. Metan jest efektywniej utleniany, gdy 0,1 mola lantanu w katalizatorze LaMnO3 zastępuje się platyną. Większa zawartość platyny w perowskicie LaMnO3 obniża zarówno jego aktywność w utlenianiu CO, jak i odporność katalizatora perowskitowego na naprzemienne zmiany temperatury. Zastąpienie części lantanu w perowskicie LaMnO3 platyną zmniejsza powierzchnię właściwą perowskitu z 8,58 m2/g (LaMnO3) do 3,1 m2/g (La0,8Pt0,2MnO3).

2

Investigation of filter-catalyst for soot emission control of older-type diesel engines.

Zabrzeski J., Tylus W., Musialik-Piotrowska A.

Environment Protection Engineering

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2006

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Vol. 32, nr 2

105-116

EN

European standards for diesel particulate matter (DPM) emission impose a ban on further use of old-type diesel engines in Poland and other new member countries of European Union. This particularly refers to engines installed in city buses. Based on the well-known theory that diesel soot particulates have the ability to coagulate and aggregate, we propose a simple and cost-effective method of DPM-emission control. We show the results of successful full-scale tests on DPM emission control system in city buses equipped with old-type diesel engines. DPM emitted from diesel engines is collected on a ceramic filter instead of using a conventional exhaust silencer. A simple automatic regeneration system provides complete combustion of the collected material within 0.5-1 minute. Such a design complies with relevant standards and eliminates potential health implications.

PL

Zaostrzające się normy emisji sadzy z silników Diesla w Polsce i w innych krajach ostatnio przyjętych do UE mogą stać się przeszkodą dla dalszej eksploatacji autobusów miejskich starego typu. Opierając się na znanej teorii zdolności cząstek sadzy do koagulacji i agregacji, zaproponowano prostą i tanią metodę ich usuwania. Przedstawiono wyniki badań ruchowych filtrokatalizatora zainstalowanego w autobusie miejskim starego typu w miejscu tradycyjnego tłumika. Prosty system automatycznej regeneracji filtra umożliwia wypalenie nagromadzonej sadzy w ciągu 0,5-1 minuty. Zaproponowane rozwiązanie umożliwia dostosowanie wielkości emisji do obowiązujących norm, przyczyniając się tym samym do poprawy jakości środowiska miejskiego

3

Wpływ dodatku tlenku lantanu (III) na aktywność katalizatorów monolitycznych w procesie spalania węglowodorów

Kucharczyk B., Zabrzeski J.

Przemysł Chemiczny

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2001

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T. 80, nr 3

109-112

4

New threats to air pollution control

Tylus W., Zabrzeski J., Musialik A.

Polish Journal of Chemical Technology

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2000

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Vol. 2, nr 1

38-42

EN

In the past few years, power generation sources mainly contributing to air pollution have been replaced by other, previously less important sources - transport, wood and coal open fire, and municipal waste combustion. The continuing town development, as well as the concomitant rise in the number of cars and fossil fuel or heating oil burning households, has become a dominant contributing source of total air pollution, especially over large urban agglomerations. Nowadays, emissions of gaseous pollutants from spark-ignition engines have been reduced markedly, owing to the wide spread use of three-way catalysts. A remedy has also been found for diesel engines. Technologies enabling manufacture of durable high-performance diesel particulate filters with self-regenerating are available and briefly presented. Little has been done so far to reduce emission from fuel burning in households. The reason is that the durability of the available catalysts appears to be insufficient. Nobel metals (Pt, Rh, Pd) which are successfully applied to the afterburning of exhaust gases from vehicles are useless. Some promising techniques such as catalytically aided heater, a heater providing complete combustion and catalytic heat generator with catalyst in the fluidized bed are discussed.

5

Monolityczne katalizatory na nośnikach metalicznych

Tylus W., Zabrzeski J., Głuszek J.

Przemysł Chemiczny

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1998

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T. 77, nr 6

206-209

6

Selectivity of oxidation of ammonia to nitrogen oxide on a wire gauze pack

Kucharczyk B., Zabrzeski J.

Polish Journal of Applied Chemistry

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1998

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Vol. 42, nr 3-4

199-207

EN

Especially designed experiments enabled determination of selectivity of individual gauzes of a catalytic pack in the process of oxidation of ammonia. It has been found that changes in selectivity observed along a pack comprising partially weared gauzes were opposite to those in a pack consisting of new gauzes. In both the cases, changes in selectivity were more dependent upon load of the catalytic bed than on initial temperature of the reagent gas. It seems obvious, that these very distinct differences in selectivity characteristics between new and weared gauzes are due to reconstruction of the near-surface layers of the catalyst, which proceeds during long-lasting operation. Therefore, it may be concluded that new gauze and used gauze are two qualitatively different catalysts.