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High surface area Mn,Mg,Al-spinels as catalyst additives for SOx abatement in fluid catalytic cracking units / Carla M. S. Polato in Industrial & engineering chemistry research, Vol. 49 N° 3 (Fevrier 2010)

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1252–1258 Titre : High surface area Mn,Mg,Al-spinels as catalyst additives for SOx abatement in fluid catalytic cracking units Type de document : texte imprimé Auteurs : Carla M. S. Polato, Auteur ; Alexandre C. C. Rodrigues, Auteur ; José L. F. Monteiro, Auteur Année de publication : 2010 Article en page(s) : pp. 1252–1258 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : High  Surface--Mn,Mg,Al-Spinels--Catalyst  Additives--SOx  Abatement  --Fluid  Catalytic Résumé : Mn,Mg,Al-spinels derived from hydrotalcite-like compounds with different Al/(M2+ + Al) molar ratios (0.25 and 0.50) and Mn/Mg of 0.30 were evaluated as catalysts for SOx removal under conditions similar to those found in fluid catalytic cracking (FCC) units. For both samples, the maximum rate of SOx pickup took place in the first 5 min of reaction, which is an interesting feature since the contact time inside the FCC regenerator is about 5−10 min. As to the regeneration step, propane seems to be a less effective reducing agent than hydrogen since it favored the release of SO2 as reduction product and shifted the reduction profile to higher temperatures. The results from XRD indicate that SO2 was mainly fixed as MgSO4, although the formation of MnSO4 has been indirectly evidenced. The performance of both samples for SOx uptake and sulfur release was also evaluated in the presence of CO and NO and no adverse effect was observed. The obtained results suggest that Mn-containing spinels are promising additives for SOx removal. ISSN : 0888-5885 [article] High surface area Mn,Mg,Al-spinels as catalyst additives for SOx abatement in fluid catalytic cracking units [texte imprimé] / Carla M. S. Polato, Auteur ; Alexandre C. C. Rodrigues, Auteur ; José L. F. Monteiro, Auteur . - 2010 . - pp. 1252–1258. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1252–1258 Mots-clés : High  Surface--Mn,Mg,Al-Spinels--Catalyst  Additives--SOx  Abatement  --Fluid  Catalytic Résumé : Mn,Mg,Al-spinels derived from hydrotalcite-like compounds with different Al/(M2+ + Al) molar ratios (0.25 and 0.50) and Mn/Mg of 0.30 were evaluated as catalysts for SOx removal under conditions similar to those found in fluid catalytic cracking (FCC) units. For both samples, the maximum rate of SOx pickup took place in the first 5 min of reaction, which is an interesting feature since the contact time inside the FCC regenerator is about 5−10 min. As to the regeneration step, propane seems to be a less effective reducing agent than hydrogen since it favored the release of SO2 as reduction product and shifted the reduction profile to higher temperatures. The results from XRD indicate that SO2 was mainly fixed as MgSO4, although the formation of MnSO4 has been indirectly evidenced. The performance of both samples for SOx uptake and sulfur release was also evaluated in the presence of CO and NO and no adverse effect was observed. The obtained results suggest that Mn-containing spinels are promising additives for SOx removal. ISSN : 0888-5885