000126500 001__ 126500
000126500 005__ 20241125101131.0
000126500 0247_ $$2doi$$a10.1016/j.cej.2022.140723
000126500 0248_ $$2sideral$$a132455
000126500 037__ $$aART-2023-132455
000126500 041__ $$aeng
000126500 100__ $$aMercadal, Juan J.
000126500 245__ $$aImproved O2-assisted styrene synthesis by double-function purification of SWCNT catalyst
000126500 260__ $$c2023
000126500 5060_ $$aAccess copy available to the general public$$fUnrestricted
000126500 5203_ $$aThe catalytic performance of SWCNT was notably improved in the oxidative dehydrogenation of ethylbenzene (EB) to styrene (ST) upon a double-function purification in one step of the raw SWCNT. This consists of lowering the MeOx concentration and generating surface C=O groups after processing it in nitric acid at controlled conditions, while preserving the structure. The textural improvement was ascribed to the cutting of the tubes/bundles by oxidation and to MeOx removal itself (dilution effect). Both EB conversion and ST selectivity increased with a parallel lowering of the undesired COx selectivity. The conversion was interpreted by the enhancement of the intrinsic properties (i.e., more surface ketonic groups) but also to the higher load of SWCNT in the bed upon purification; both factors contribute to a higher number of active sites (C=O) in the bed for styrene formation. The most purified catalyst underperformed in conversion once the purification altered the SWCNT structure notably. Thus, preserving the structure is an important condition to achieve high conversion and yield. The better selectivity was explained in two ways; more styrene-forming sites (C=O) or less COx-forming sites (uncoated MeOx) in the bed, or both. The styrene yield per catalyst volume was improved by an average of ca. 240 % in comparison to the non-purified SWCNT. Deactivation is critical in maximizing the purification effect on the intrinsic and volumetric yields. In practical terms, the purification method proved to enhance the reaction; the selectivity towards the unwanted COx was significantly lowered with a gain towards styrene, achieving comparable selectivity values as in the conventional process, but operated at much lower temperature.
000126500 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E13-20R$$9info:eu-repo/grantAgreement/ES/DGA/T03-20R$$9info:eu-repo/grantAgreement/EC/H2020/823717/EU/Enabling Science and Technology through European Electron Microscopy/ESTEEM3$$9This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 823717-ESTEEM3$$9info:eu-repo/grantAgreement/ES/MICINN/RYC-2018-024561-I
000126500 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000126500 590__ $$a13.4$$b2023
000126500 592__ $$a2.852$$b2023
000126500 591__ $$aENGINEERING, ENVIRONMENTAL$$b3 / 81 = 0.037$$c2023$$dQ1$$eT1
000126500 591__ $$aENGINEERING, CHEMICAL$$b7 / 170 = 0.041$$c2023$$dQ1$$eT1
000126500 593__ $$aEnvironmental Chemistry$$c2023$$dQ1
000126500 593__ $$aIndustrial and Manufacturing Engineering$$c2023$$dQ1
000126500 593__ $$aChemistry (miscellaneous)$$c2023$$dQ1
000126500 593__ $$aChemical Engineering (miscellaneous)$$c2023$$dQ1
000126500 594__ $$a21.7$$b2023
000126500 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000126500 700__ $$0(orcid)0000-0002-5229-2717$$aMayoral, Alvaro$$uUniversidad de Zaragoza
000126500 700__ $$aFierro, José Luis G.
000126500 700__ $$0(orcid)0000-0001-8158-1270$$aGarcía-Bordejé, Enrique
000126500 700__ $$aMelián-Cabrera, Ignacio
000126500 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada
000126500 773__ $$g455 (2023), 140723 [13 pp.]$$pChem. eng. j.$$tChemical Engineering Journal$$x1385-8947
000126500 8564_ $$s1526998$$uhttps://zaguan.unizar.es/record/126500/files/texto_completo.pdf$$yPostprint
000126500 8564_ $$s2877777$$uhttps://zaguan.unizar.es/record/126500/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000126500 909CO $$ooai:zaguan.unizar.es:126500$$particulos$$pdriver
000126500 951__ $$a2024-11-22-11:58:57
000126500 980__ $$aARTICLE