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Determination of the Content of Promoters in Magnetite and Wustite Phases in the Fused Iron Catalyst

100%

Lendzion-Bieluń Z., Jędrzejewski R.

Polish Journal of Chemical Technology

2013

vol. 15

issue 1

27-29

Taking advantage of differences in etching rates of crystallographic phases, forming an oxidized form of the fused iron catalyst, a content of promoters in main phases, magnetite and wustite, was determined. A calcium oxide content in magnetite and wustite was 0.54 wt% and 3.59 wt%, respectively. Aluminum oxide was found in the magnetite phase, and its content was 4.5 wt%. The third promoter, potassium oxide, was almost completely located outside these phases. XRD and ICP-OES instrumental methods were used in the investigations.

The effect of aluminium oxide on the reduction of cobalt oxide and thermostabillity of cobalt and cobalt oxide

81%

Lendzion-Bieluń Z., Jędrzejewski R., Arabczyk W.

Open Chemistry

2011

vol. 9

issue 5

834-839

During precipitation and calcination at 200°C nanocrystalline Co3O4 was obtained with average size crystallites of 13 nm and a well developed specific surface area of 44 m2 g−1. A small addition of a structural promoter, e.g. Al2O3, increases the specific surface area of the cobalt oxide (54 m2 g−1) and decreases the average size of crystallites (7 nm). Al2O3 inhibits the reduction process of Co3O4 by hydrogen. Reduction of cobalt oxide with aluminium oxide addition runs by equilibrium state at all the respective temperatures. The apparent activation energy of the recrystallization process of the nanocrystalline cobalt promoted by the aluminium oxide is 85 kJ mol−1. Aluminium oxide improves the thermostability of both cobalt oxide and the cobalt obtained as a result of oxide phase reduction. [...]

Utilization of spent iron catalyst for ammonia synthesis

42%

Arabczyk W., Narkiewicz U., Lendzion-Bieluń Z., Moszyński D., Pełech I., Ekiert E., Podsiadły M., Pelka R., Jędrzejewski R., Moszyńska I., Sibera D.

Polish Journal of Chemical Technology

2007

vol. 9

issue 3

108-113

Several methods of the utilization of spent iron catalyst for ammonia synthesis have been presented. The formation of iron nitrides of different stoichiometry by direct nitriding in ammonia in the range of temperatures between 350°C and 450°C has been shown. The preparation methods of carbon nanotubes and nanofibers where iron catalyst catalyse the decomposition of hydrocarbons have been described. The formation of magnetite embedded in a carbon material by direct oxidation of carburized iron catalyst has been also presented.

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2 Polish Journal of Chemical Technology

1 Open Chemistry

1 2013

1 2011

1 2007

3 Jędrzejewski R.

3 Lendzion-Bieluń Z.

2 Arabczyk W.

1 Ekiert E.

1 Moszyńska I.

1 Moszyński D.

1 Narkiewicz U.

1 Pelka R.

1 Pełech I.

1 Podsiadły M.

1 Sibera D.

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Determination of the Content of Promoters in Magnetite and Wustite Phases in the Fused Iron Catalyst

The effect of aluminium oxide on the reduction of cobalt oxide and thermostabillity of cobalt and cobalt oxide

Utilization of spent iron catalyst for ammonia synthesis