000164094 001__ 164094 000164094 005__ 20251121161351.0 000164094 0247_ $$2doi$$a10.1016/j.proci.2025.105900 000164094 0248_ $$2sideral$$a146190 000164094 037__ $$aART-2025-146190 000164094 041__ $$aeng 000164094 100__ $$0(orcid)0000-0002-1458-8920$$aViteri, Fausto$$uUniversidad de Zaragoza 000164094 245__ $$aPyrolysis of ethylene – ammonia mixture: Formation of soot, gases and PAH 000164094 260__ $$c2025 000164094 5060_ $$aAccess copy available to the general public$$fUnrestricted 000164094 5203_ $$aThe effect of inlet concentration of NH3 (0, 30000, 60000, and 100000 ppm) and temperature (1275, 1375, and 1475 K) on the formation of soot, gases and polycyclic aromatic hydrocarbons (PAH) from the pyrolysis of C2H4/NH3 mixtures with constant concentration of C2H4 (30000 ppm) was analyzed. Light gases were quantified through gas chromatography, while soot was collected in a fiber filter, at the reactor outlet, and the particle diameter was analyzed. The PAH were analyzed through gas chromatograph coupled to mass spectrometer by considering the 16 PAH reported by Environmental Protection Agency (EPA) as priority pollutants. The main results show that the higher the presence of NH3 in the NH3/C2H4 mixture, the lower the soot formation. This decrease of soot is accompanied by an increase of HCN and a decrease in C2H2, indicating that the carbon has been removed from the typical soot reaction pathways. In all conditions tested, PAH formed follow the typical trend observed in earlier works with respect to temperature, i.e. as the temperature increases, the formation of PAH decreases. At 1275 K, the presence of high NH₃ levels increases PAH concentrations, likely due to suppression of soot formation routes, which prevents PAH consumption and allows aromatic intermediates to accumulate rather than proceed to particle growth. The increase in NH3 concentrations at the inlet reduces the toxicity expressed as benzo[a]pyrene equivalent concentration (B[a]P-eq), under all conditions studied. Analysis of the particle distribution diameter reveals that the NH3 presence reduces diameter variations and predominantly results in smaller soot particles. 000164094 536__ $$9info:eu-repo/grantAgreement/ES/DGA/T22-23R$$9info:eu-repo/grantAgreement/ES/MICINN/PID2021-124032OB-I00$$9info:eu-repo/grantAgreement/EUR/MICINN/TED2021-129557B-I00 000164094 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc$$uhttps://creativecommons.org/licenses/by-nc/4.0/deed.es 000164094 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000164094 700__ $$aSoler, María 000164094 700__ $$aStarace, Paola 000164094 700__ $$0(orcid)0000-0001-7559-9669$$aAbián, María$$uUniversidad de Zaragoza 000164094 700__ $$0(orcid)0000-0003-4679-5761$$aAlzueta, María U.$$uUniversidad de Zaragoza 000164094 7102_ $$15005$$2555$$aUniversidad de Zaragoza$$bDpto. Ing.Quím.Tecnol.Med.Amb.$$cÁrea Ingeniería Química 000164094 7102_ $$15005$$2790$$aUniversidad de Zaragoza$$bDpto. Ing.Quím.Tecnol.Med.Amb.$$cÁrea Tecnologi. Medio Ambiente 000164094 7102_ $$15001$$2065$$aUniversidad de Zaragoza$$bDpto. Ciencia Tecnol.Mater.Fl.$$cÁrea Cienc.Mater. Ingen.Metal. 000164094 773__ $$g41 (2025), 105900 [7 pp.]$$pProc. Combust. Inst.$$tPROCEEDINGS OF THE COMBUSTION INSTITUTE$$x1540-7489 000164094 8564_ $$s3202208$$uhttps://zaguan.unizar.es/record/164094/files/texto_completo.pdf$$yVersión publicada 000164094 8564_ $$s2504037$$uhttps://zaguan.unizar.es/record/164094/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000164094 909CO $$ooai:zaguan.unizar.es:164094$$particulos$$pdriver 000164094 951__ $$a2025-11-21-14:26:22 000164094 980__ $$aARTICLE