000079144 001__ 79144 000079144 005__ 20200117211602.0 000079144 0247_ $$2doi$$a10.1016/j.apsusc.2018.05.177 000079144 0248_ $$2sideral$$a106631 000079144 037__ $$aART-2018-106631 000079144 041__ $$aeng 000079144 100__ $$aCharisiou, N.D. 000079144 245__ $$aInvestigating the correlation between deactivation and the carbon deposited on the surface of Ni/Al2O3 and Ni/La2O3-Al2O3 catalysts during the biogas reforming reaction 000079144 260__ $$c2018 000079144 5060_ $$aAccess copy available to the general public$$fUnrestricted 000079144 5203_ $$aNi/Al2O3 and Ni/La2O-Al2O3 catalysts were investigated for the biogas reforming reaction using CH4/CO2 mixtures with minimal dilution. Stability tests at various reaction temperatures were conducted and TGA/DTG, Raman, STEM-HAADF, HR-TEM, XPS techniques were used to characterize the spent samples. Graphitized carbon allotrope structures, carbon nanotubes (CNTs) and amorphous carbon were formed on all samples. Metallic Ni0 was recorded for all (XPS), whereas a strong peak corresponding to Ni2O3/NiAl2O4, was observed for the Ni/Al sample (650–750 °C). Stability tests confirm that the Ni/LaAl catalyst deactivates at a more gradual rate and is more active and selective in comparison to the Ni/Al for all temperatures. The Ni/LaAl exhibits good durability in terms of conversion and selectivity, whereas the Ni/Al gradually loses its activity in CH4 and CO2 conversion, with a concomitant decrease of the H2 and CO yield. It can be concluded that doping Al2O3 with La2O3 stabilizes the catalyst by (a) maintaining the Ni0 phase during the reaction, due to higher dispersion and stronger active phase-support interactions, (b) leading to a less graphitic and more defective type of deposited carbon and (c) facilitating the deposited carbon gasification due to the enhanced CO2 adsorption on its increased surface basic sites. 000079144 536__ $$9info:eu-repo/grantAgreement/ES/ISCIII/CIBER-BBN 000079144 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/ 000079144 590__ $$a5.155$$b2018 000079144 591__ $$aCHEMISTRY, PHYSICAL$$b35 / 148 = 0.236$$c2018$$dQ1$$eT1 000079144 591__ $$aPHYSICS, CONDENSED MATTER$$b16 / 68 = 0.235$$c2018$$dQ1$$eT1 000079144 591__ $$aPHYSICS, APPLIED$$b23 / 148 = 0.155$$c2018$$dQ1$$eT1 000079144 591__ $$aMATERIALS SCIENCE, COATINGS & FILMS$$b1 / 20 = 0.05$$c2018$$dQ1$$eT1 000079144 592__ $$a1.115$$b2018 000079144 593__ $$aSurfaces, Coatings and Films$$c2018$$dQ1 000079144 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion 000079144 700__ $$aTzounis, L. 000079144 700__ $$0(orcid)0000-0002-6873-5244$$aSebastian, V.$$uUniversidad de Zaragoza 000079144 700__ $$aHinder, S.J. 000079144 700__ $$aBaker, M.A. 000079144 700__ $$aPolychronopoulou, K. 000079144 700__ $$aGoula, M.A. 000079144 7102_ $$15005$$2555$$aUniversidad de Zaragoza$$bDpto. Ing.Quím.Tecnol.Med.Amb.$$cÁrea Ingeniería Química 000079144 773__ $$g474 (2018), 42-56$$pAppl. surf. sci.$$tApplied Surface Science$$x0169-4332 000079144 8564_ $$s2023395$$uhttps://zaguan.unizar.es/record/79144/files/texto_completo.pdf$$yPostprint 000079144 8564_ $$s56435$$uhttps://zaguan.unizar.es/record/79144/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint 000079144 909CO $$ooai:zaguan.unizar.es:79144$$particulos$$pdriver 000079144 951__ $$a2020-01-17-21:13:04 000079144 980__ $$aARTICLE