Wyniki wyszukiwania

Filtruj wyniki

  • Czasopisma
  • Autorzy
  • Słowa kluczowe
  • Data
  • Typ

Wyniki wyszukiwania

Wyników: 3
Wyników na stronie: 25 50 75
Sortuj wg:

Abstrakt

Periodic adsorption in a perfect mixing tank of a limited volume was considered. It was assumed that the adsorption rate is limited by diffusion resistance in a pellet. The approximate model of diffusion kinetics based on a continued fraction approximation was compared with the exact analytical solution. For the approximate model an algorithm was developed to determine a temporal variation of the adsorbate concentration in the pellet. The comparison was made for different values of the adsorbent load factor. In the numerical tests different shapes of pellets were considered. Both the numerical tests as well as our own experimental results showed that the approximate model provides results that are in good agreement with the exact solution. In the experimental part of this work adsorption of p-nitrophenol and acetic acid from aqueous solutions on cylindrical pellets of activated carbon was conducted.

Przejdź do artykułu

Autorzy i Afiliacje

Krzysztof Kupiec
Monika Gwadera
Barbara Larwa
Pobierz PDF Pobierz RIS Pobierz Bibtex

Abstrakt

A series of steps taken to determine a kinetic equation that describes hydrogenation of propene on nickel catalyst is presented in this study. Mixed factorial design approach, belongs to designing of experiments methods was used to plane experiments. The investigations showed that the method applied makes possible determination of the kinetic equation in a relatively fast and cheap manner since only a few measurement points is required. The equation obtained was verified experimentally and statistically. Both tests showed satisfactory precision of anticipated values of the process rate.
Przejdź do artykułu

Bibliografia

Aaserud C., Hilmen A.-M., Bergene E.S.E., Schanke D., Holmena A., 2004. Hydrogenation of propene on cobalt Fischer–Tropsch catalysts. Catal. Lett., 94, 171–176. DOI: 10.1023/B:CATL.0000020541.28174.c7.
Ahmadigoltapeh, S., Mehranbod, N., Halimejani, H.Z., 2015. Propylene hydrogenation through structured and con- ventional catalyst beds: Experiment and modelling. J. Nat. Gas Sci. Eng., 27, 822–830. DOI: 10.1016/j.jngse.2015.09.030.
Brandao L., Fritsch D., Madeira LM., Mendes A.M., 2004. Kinetics of propylene hydrogenation on nanostructured palladium clusters. Chem. Eng. J., 103, 89–97. DOI: 10.1016/j.cej.2004.07.008.
Carturan G., Enzo S., Ganzerla R., Lenarda M., Zanoni R., 1990. Role of solid-state structure in propene hydro- genation with nickel catalysts. J. Chem. Soc. Faraday Trans., 86, 739–746. DOI: 10.1039/ft9908600739.
Esfe M.H.,. Rsotamian H, Shabani-Samghabadi A., Arani A.A.A., 2017. Application of three-level general fac- torial design approach for thermal conductivity of MgO/ water nanofluids. Appl. Therm. Eng., 127, 1194–1199. DOI: 10.1016/j.applthermaleng.2017.07.211.
Montgomery D.C., 2017. Design and analysis of experiments. 9th ed., Wiley.
Özbay N., Yargıç A.Ş., Yarbay-Şahin R.Z., Önal E., 2013. Full factorial experimental design analysis of reactive dye removal by carbon adsorption. J. Chem., 234904. DOI: 10.1155/2013/234904.
Pachulski A., Schödel R., Claus P., 2012. Kinetics and reactor modeling of a Pd-Ag/Al2O3 catalyst during selective hydrogenation of ethyne. Appl. Catal., A, 445–446, 107–120. DOI: 10.1016/j.apcata.2012.08.018.
Schweitzer NM., Hu B., Das U., Hacksung K., Greeley J., Curtiss L.A., Stair P.C., Miller J.T., Hock A.S., 2014. Propylene hydrogenation and propane dehydrogenation by a single-site Zn2+ on silica catalyst. ACS Catal., 4, 1091–1098. DOI: 10.1021/cs401116p.
Sen G.A., 2016. Application of full factorial experimental design and response surface methodology for chromite beneficiation by Knelson concentrator. Minerals, 6, 5. DOI: 10.3390/min6010005.
Szukiewicz M., Chmiel-Szukiewicz E., Kaczmarski K., Szałek A., 2019. Dead zone for hydrogenation of propylene atalyst pellets. Open Chem., 17, 295–301. DOI: 10.1515/chem-2019-0037.
Przejdź do artykułu

Autorzy i Afiliacje

Adrian Szałek
1
Mirosław Szukiewicz
1
Elżbieta Chmiel-Szukiewicz
1

  1. Rzeszów University of Technology, Faculty of Chemistry, al. Powstańców Warszawy 6, 35-959 Rzeszów, Poland

Abstrakt

The large diversity of chemical substances present in air, water, or soil makes it necessary tostudy their mutual impact on the effectiveness of microbiological decomposition ofcontaminants. This publication presents the results of the studies aimed at evaluating the effect of two biogenic heavy metals - zinc and copper - on the phenol biodegradation by the Stenotrophomonas maltophilia KB2 strain. The tests were carried out for concentrations ofmetals significantly exceeding the legally permitted wastewater values: for zinc up to13.3 g·m -3, and copper up to 3.33 g·m -3. In the tested metal concentration range, phenol biodegradation by the S. maltophilia KB2 strain was not significantly influenced by theintroduced dose of zinc. While the presence of copper inhibited both biomass growth andsubstrate degradation. Kinetic data of metal and phenol mixtures were analyzed and very goodcorrelations were obtained for the proposed equations. An equation consistents with the Hanand Levenspiel model was proposed for the system S. maltophilia KB2-phenol-copper, whilean equation consistents with the Kai model for the system St. maltophilia KB2-phenol-zinc. The simultaneous presence of Zn and Cu ions in the culture resulted in a stronger inhibition ofphenol biodegradation.
Przejdź do artykułu

Autorzy i Afiliacje

Agnieszka Gąszczak
1
ORCID: ORCID
Elżbieta Szczyrba
1
ORCID: ORCID
Anna Szczotka
1
ORCID: ORCID

  1. Polish Academy of Sciences, Institute of Chemical Engineering, Baltycka 5, 44-100 Gliwice, Poland

Ta strona wykorzystuje pliki 'cookies'. Więcej informacji