The role of crystallite size of iron oxide catalyst for soot combustion

Stelmachowski, Paweł; Kopacz, A.; Legutko, Piotr; Indyka, Paulina; Wojtasik, M.; Ziemiański, L.; Żak, G.; Sojka, Zbigniew; Kotarba, Andrzej

doi:10.1016/j.cattod.2015.02.018

Cited by 26 publications

(17 citation statements)

References 26 publications

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“…The catalyst samples were examined by Raman spectroscopy to provide complementary information about the structure of iron‐containing mixed oxides, as shown in Figure . The Fe 2 O 3 is assigned to hematite structure, and exhibits three intense vibrating bands . The bands at 213, 270, and 388 cm −1 shift to higher wave numbers for FeCe, FeZr, and FeBa, which is due to the decrease of grain size or the formation of surface defects such as oxygen vacancies.…”

Section: Resultsmentioning

confidence: 99%

Steam catalytic cracking of coal tar over iron‐containing mixed metal oxides

Wang

Jin

et al. 2018

Can J Chem Eng

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Steam catalytic cracking is deemed as a promising method for the catalytic cracking of coal tar. In this study, a serial of iron-containing mixed metal oxides including ceria, zirconia, alumina, cobalt, nickel, and barium oxides were prepared for steam catalytic cracking of coal tar and characterized by N 2 adsorption-desorption, X-ray diffraction, H 2 temperature programmed reduction, and Raman spectroscopy, respectively. It was found that the specific surface area and pore volume increase while the crystal size decreases when Fe 2 O 3 was doped with the investigated metal oxides. Among these, iron-alumina mixed oxide (FeAl) shows the highest specific surface area and pore volume. The H 2 -TPR analysis indicated that most of the mixed metal oxides have lower reduction temperature, especially for iron-ceria mixed oxide (FeCe). The reduction temperature of FeCe is around 500 8C, and its reduction peak shifts to a lower temperature and becomes narrower as compared to other iron-containing mixed metal oxides. The steam catalytic cracking of coal tar at 550 8C showed that the light tar content (below 360 8C) over FeCe, FeCo, and FeAl are 68.5, 67.0, and 66.5 %, respectively. The increase of CO 2 and H 2 over iron-containing mixed metal oxides suggested that oxygen species from iron-containing mixed metal oxides and steam could participate in the steam catalytic cracking of coal tar.

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Section: Resultsmentioning

confidence: 99%

Steam catalytic cracking of coal tar over iron‐containing mixed metal oxides

Wang

Jin

et al. 2018

Can J Chem Eng

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“…Shorter organic ligands, C11, due to their lower thermal stability shift the ignition temperature and the soot burning to lower values improving the whole combustion efficiency. Moreover, the average size of the FBC particles produced from the Fe-C11 precursor is lower than for Fe-C18, which is also beneficial for the soot combustion as shown by us recently [16].…”

Section: Resultsmentioning

confidence: 99%

“…The reaction mixtures (catalyst-soot) were prepared by impregnating the soot with the FBC precursor, ensuring the same amount of iron oxide phase. The soot to catalyst weight ratio was set to 5:1, which is a typical experimental proportion used in both tight contact and loose contact modes, and which varies usually from 1:4 to 1:8 [16,18]. The wet contact applied in this study is closer to the tight contact mode, yet it provides better reproducibility of the soot oxidation tests results.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, hematite nanoparticles formed in situ in the laboratory and real process conditions of light fuel oil combustion with addition of fuel borne catalyst (FBC) precursors, exhibit a beneficial size range of 5-15 nm [16]. In the general context of in situ formation of catalytically active phase (FBC) in the form of nanoparticles the chemical structure of the employed organic dispersant and its effect on the combustion process of soot (carbon particles mingled with long-chain hydrocarbons), as well as formation of the active c-Fe 2 O 3 polymorph of the catalyst is necessary to elucidate.…”

Section: Introductionmentioning

confidence: 99%

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Insights into Structure, Morphology and Reactivity of the Iron Oxide Based Fuel Borne Catalysts

et al. 2016

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Iron-based FBC additives with a different length of the organic stabilizing ligands: undecylenic acid (C11) and oleic acid (C18) were synthesized. A physicochemical characterization of the materials structure and morphology was performed by means of Raman spectroscopy, electron diffraction and TEM imaging. It was found that the reactivity of iron-based fuel borne catalysts depends on the length of the organic disperser and the size of the formed hematite nanoparticles. Reactivity tests performed in soot oxidation reaction both at a laboratory scale and in a commercial light oil burner revealed that the C11 stabilizer is more efficient than the C18 one in decreasing the emission of CO and soot particles.

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“…Pakiety te, oprócz dodatków stabilizujących, zawierają katalizatory spalania, których stosowanie ma zapewnić ograniczenie emisji substancji szkodliwych powstających podczas spalania, a także zmniejszenie zużycia paliwa [12,13]. Wpływ metaloorganicznych dodatków do olejów napędowych na emisję spalin i zużycie paliwa w silnikach z zapłonem samoczynnym jest szeroko omawiany w literaturze światowej [1,5,6,[7][8][9][10]. Analogicznego działania można się spodziewać w przypadku ich zastosowania do olejów opałowych, w tym również ciężkich paliw pozostałościowych.…”

Section: Metodyka Badańunclassified

Wpływ pakietu dodatków na właściwości paliwa pozostałościowego w trakcie przechowywania

Duda

Berdechowski

Żak

2017

Self Cite

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Wpływ pakietu dodatków na właściwości paliwa pozostałościowego w trakcie przechowywania W artykule przedstawiono wyniki badań wybranych parametrów paliw pozostałościowych uszlachetnionych pakietami dodatków po okresie długotrwałego przechowywania w podwyższonej temperaturze. Badane pakiety dodatków zawierały katalizator spalania, dodatek detergentowy lub detergentowo-dyspergujący oraz rozpuszczalnik węglowodorowy. Badania miały charakter porównawczy, tj. wykonywane były dla paliw bazowych i paliw zawierających formulacje dodatków. Test prowadzono w temperaturze 80°C w ciągu trzech miesięcy dla dwóch paliw bazowych oraz trzech formulacji pakietów dodatków uszlachetniających. Badania ciężkich olejów opałowych odbywały się w zakresie wybranych parametrów fizykochemicznych, ze szczególnym uwzględnieniem tych, które mogą ulec zmianie pod wpływem dodatków uszlachetniających w trakcie długotrwałego przechowywania, tj. gęstości, lepkości kinematycznej, temperatury płynięcia, liczby rozdziału faz oraz zawartości osadów. Stwierdzono, że nowe formulacje pakietów dodatków do paliw pozostałościo-wych nie wpływają negatywnie na badane parametry ciężkiego oleju opałowego w trakcie długotrwałego przechowywania w podwyższonej temperaturze. Uszlachetnione paliwa mogą być eksploatowane w warunkach zakładów energetycznych, co eliminuje konieczność wprowadzania skomplikowanych rozwiązań technicznych w instalacjach podawania cięż-kiego oleju opałowego, niezbędnych w przypadku dozowania pakietu on-line.Słowa kluczowe: katalizatory spalania, dyspergatory, paliwo pozostałościowe. Effect of a package of additives on the properties of residual fuel during storageThe article presents the results of selected parameters of residual fuels improved with a package of additives after long term storage at increased temperature. The test additive packages contained a combustion catalyst, a detergent or a detergentdispersant and a hydrocarbon solvent. The research was comparative, i.e. were conducted for basic fuels and fuels containing additive formulations. The test was conducted at 80°C for three months for the two fuels and the three formulations of additive packages. The study of heavy fuel oils were carried out in selected physical and chemical parameters, with particular emphasis on those that can be changed under the influence of additives during long-term storage i.e. the density, kinematic viscosity, pour point, the separability number and the content of sediments. The novel formulations additive packages for residual fuels do not affect the measured parameters of heavy fuel oil during prolonged storage at increased temperature. Improved fuel can be used in power plants conditions -it eliminates the need to introduce complicated technical solutions in heavy fuel oil supply systems, which is indispensable for dosing package on-line.Key words: combustion catalysts, dispersants, residual fuel.Stosowanie ciężkich paliw pozostałościowych wiąże się z wieloma problemami eksploatacyjnymi, tj. słabą stabilnością, skłonnością do wytrącania osadów i...

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The role of crystallite size of iron oxide catalyst for soot combustion

Cited by 26 publications

References 26 publications

Steam catalytic cracking of coal tar over iron‐containing mixed metal oxides

Steam catalytic cracking of coal tar over iron‐containing mixed metal oxides

Insights into Structure, Morphology and Reactivity of the Iron Oxide Based Fuel Borne Catalysts

Wpływ pakietu dodatków na właściwości paliwa pozostałościowego w trakcie przechowywania

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