Kinetic modelling of VOC catalytic steam pyrolysis for tar abatement phenomena in gasification/pyrolysis technologies
Φόρτωση...
Ημερομηνία
Συγγραφείς
Taralas, G.
Kontominas, M. G.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Fuel
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
Tar elimination and hot-gas conditioning in thermochemical conversion processes, i.e. thermal gasification, pyrolysis of heterogeneous materials involved two main classes of catalysts and/or additives: metallic and mineral oxides. This communication focused on the experimental kinetic data on catalytic steam cracking of vaporized toluene (PC7H8 = 0.93-1.15 kPa, H2O/C7H8 = 2.67 mol/mol, space-time tau = 0.067-0.127 kg h (Nm(3))(-1)) as a tar-derived species and/or Volatile Organic Compound (VOC). Toluene (C7H8) has been chosen as a model formula for reactive tar-derived one-ring species determined from tar constituents. Gaseous product distribution data were obtained at atmospheric pressure (101.3 kPa). steam pyrolysis temperature range of 923-1223 K and GHSV 1200-2300 Nm(3) (m(3)h)(-1). The overall catalytic pyrolysis of toluene over a commercial available metal based catalyst NiMo/gamma-Al2O3 was compared to the pyrolysis in presence of basic non-metallic mineral additives. i.e. Norwegian (Norsk Hydro) dolomitic magnesium oxide [MgO], Swedish low surface quicklime [CaO]. and calcined dolomite [CaM2(O)(2)]. The operational conditions were applied without internal or external mass-transfer limitations. Kinetics for the pyrolysis could be described by first-order reactions for all the studied additives. The influence of hydrogen gas (30 vol%, tau = 0.150 kg h (Nm)(-1)) and water vapor (P-H2O = 4.51-21.41 kPa, tau = 0.092-0.270 kg h (Nm(3))(-1)) in vaporized toluene cracking runs over low surface quicklime [CaO] was determined. A mechanistic model of the Langmuir-Hinshelwood type describing toluene decomposition was also developed. (C) 2003 Elsevier Ltd. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
cao, mgo, nimo catalyst, calcined dolomite, gasification, steam pyrolysis, toluene, tar, volatile organic compound, biomass gasification, calcined dolomite, fluidized-bed, raw gas, hot gas, n-heptane, fuel gas, gasifier, cracking, elimination
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000221067700014
http://ac.els-cdn.com/S0016236103004046/1-s2.0-S0016236103004046-main.pdf?_tid=9844351cb70bded83a691644392026f5&acdnat=1333031498_7fbf3d8a0df52d755c935720c087de1b
http://ac.els-cdn.com/S0016236103004046/1-s2.0-S0016236103004046-main.pdf?_tid=9844351cb70bded83a691644392026f5&acdnat=1333031498_7fbf3d8a0df52d755c935720c087de1b
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας