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Attrition studies of an iron fischer–tropsch catalyst used in a pilot-scale stirred tank slurry reactor / Tie-jun Lin in Industrial & engineering chemistry research, Vol. 51 N° 40 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - pp. 13123–13131 Titre : Attrition studies of an iron fischer–tropsch catalyst used in a pilot-scale stirred tank slurry reactor Type de document : texte imprimé Auteurs : Tie-jun Lin, Auteur ; Xuan Meng, Auteur ; Shi Li, Auteur Année de publication : 2012 Article en page(s) : pp. 13123–13131 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalysts Résumé : Attrition resistance is a key design parameter for catalysts used in slurry phase Fischer–Tropsch (F–T) reactors, especially for industrial-scale reaction. It is well-known that iron F–T catalyst particles undergo physical attrition and chemical stresses caused by phase transformations. Here we report on attrition properties of a Fe–Cu–K–SiO2 catalyst used in a pilot-scale stirred tank slurry reactor (STSR) under low temperature F–T reaction conditions. The wax-free catalysts were characterized by SEM, EDS, BET surface area measurements, and a Mastersizer 2000 for particle size analysis. The results show that, after 408 h of reaction in an STSR, the particle size reduction due to erosion/abrasion and fracture was apparent. Large reductions in the Sauter mean diameter (93.45%) and the volume moment diameter (71.67%) were observed. The increase in the fractions of particles smaller than 5 and 10 μm was 18.25 and 30.11%, respectively. We concluded therefore that the catalyst underwent more severe attrition in industrial application and the attrition was mainly caused by the fracture of larger or smaller particles. Further study is needed to improve the catalyst attrition resistance. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3014428 [article] Attrition studies of an iron fischer–tropsch catalyst used in a pilot-scale stirred tank slurry reactor [texte imprimé] / Tie-jun Lin, Auteur ; Xuan Meng, Auteur ; Shi Li, Auteur . - 2012 . - pp. 13123–13131. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - pp. 13123–13131 Mots-clés : Catalysts Résumé : Attrition resistance is a key design parameter for catalysts used in slurry phase Fischer–Tropsch (F–T) reactors, especially for industrial-scale reaction. It is well-known that iron F–T catalyst particles undergo physical attrition and chemical stresses caused by phase transformations. Here we report on attrition properties of a Fe–Cu–K–SiO2 catalyst used in a pilot-scale stirred tank slurry reactor (STSR) under low temperature F–T reaction conditions. The wax-free catalysts were characterized by SEM, EDS, BET surface area measurements, and a Mastersizer 2000 for particle size analysis. The results show that, after 408 h of reaction in an STSR, the particle size reduction due to erosion/abrasion and fracture was apparent. Large reductions in the Sauter mean diameter (93.45%) and the volume moment diameter (71.67%) were observed. The increase in the fractions of particles smaller than 5 and 10 μm was 18.25 and 30.11%, respectively. We concluded therefore that the catalyst underwent more severe attrition in industrial application and the attrition was mainly caused by the fracture of larger or smaller particles. Further study is needed to improve the catalyst attrition resistance. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3014428

Desulfurization of model gasoline on modified bentonite / Xiao-lin Tang in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) Titre : Desulfurization of model gasoline on modified bentonite Type de document : texte imprimé Auteurs : Xiao-lin Tang, Auteur ; Xuan Meng, Auteur ; Li Shi, Auteur Année de publication : 2011 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Modeling  Desulfurization Résumé : This work mainly involved the investigation of the adsorption of propylmercaptan (PM) on modified bentonite adsorbents. The adsorbents were prepared by loading it separately with Cu2+, Cu+, Fe3+, and MnO4―. In general, these bentonite adsorbents tested for sulfur adsorption capacity at breakthrough followed the order: KMnO4―bentonite > Cu(I)―bentonite > Cu(II)―bentonite > Fe(III)―bentonite. Several factors that influence the desulfurization capability, including loading and baking temperature, were investigated. The results of X-ray diffraction (XRD), nitrogen sorption (BET), thermal analysis (TGA), and Fourier transform infrared (FT-IR) spectroscopy showed that the ability of modified bentonite to adsorb PM depends strongly on its surface chemistry, particularly on the presence of basic oxygen-containing groups and acid content. The high sulfur capacities of KMnO4―bentonite and Fe(III)―bentonite were because of the powerful oxidization of MnO4― and Fe3+. The high sulfur capacities of Cu(I)―bentonite and Cu(II)―bentonite were due to π-complexation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239069 [article] Desulfurization of model gasoline on modified bentonite [texte imprimé] / Xiao-lin Tang, Auteur ; Xuan Meng, Auteur ; Li Shi, Auteur . - 2011. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) Mots-clés : Modeling  Desulfurization Résumé : This work mainly involved the investigation of the adsorption of propylmercaptan (PM) on modified bentonite adsorbents. The adsorbents were prepared by loading it separately with Cu2+, Cu+, Fe3+, and MnO4―. In general, these bentonite adsorbents tested for sulfur adsorption capacity at breakthrough followed the order: KMnO4―bentonite > Cu(I)―bentonite > Cu(II)―bentonite > Fe(III)―bentonite. Several factors that influence the desulfurization capability, including loading and baking temperature, were investigated. The results of X-ray diffraction (XRD), nitrogen sorption (BET), thermal analysis (TGA), and Fourier transform infrared (FT-IR) spectroscopy showed that the ability of modified bentonite to adsorb PM depends strongly on its surface chemistry, particularly on the presence of basic oxygen-containing groups and acid content. The high sulfur capacities of KMnO4―bentonite and Fe(III)―bentonite were because of the powerful oxidization of MnO4― and Fe3+. The high sulfur capacities of Cu(I)―bentonite and Cu(II)―bentonite were due to π-complexation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239069

A Novel application of methanesulfonic acid as catalyst for the alkylation of olefins with aromatics / Ying Tian in Industrial & engineering chemistry research, Vol. 51 N° 42 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13627-13631 Titre : A Novel application of methanesulfonic acid as catalyst for the alkylation of olefins with aromatics Type de document : texte imprimé Auteurs : Ying Tian, Auteur ; Xuan Meng, Auteur ; Ji-yun Duan, Auteur Année de publication : 2012 Article en page(s) : pp. 13627-13631 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Alkylation  Catalyst Résumé : Methanesulfonic acid (MSA) was used as the catalyst to remove trace olefins from aromatics (referred to as oil). The reactions were conducted in a round-bottom flask equipped with a reflux condenser and oil-bath under atmospheric pressure. The influences of the reaction temperature, the mass ratio of MSA to oil, and the reaction time were investigated. The experimental results showed that after a 40 min reaction time at 413 K, the olefins conversion of 89.45% was obtained with a mass ratio of MSA to oil of 6%. The catalyst was reused five times without a reactivation treatment, and the olefins conversion reached 66.02% the fifth time. More importantly, the catalytic mechanism was also proposed in this work. In addition, as MSA is biodegradable, this method represents an environmentally benign route to remove trace olefins from aromatics. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508186 [article] A Novel application of methanesulfonic acid as catalyst for the alkylation of olefins with aromatics [texte imprimé] / Ying Tian, Auteur ; Xuan Meng, Auteur ; Ji-yun Duan, Auteur . - 2012 . - pp. 13627-13631. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13627-13631 Mots-clés : Alkylation  Catalyst Résumé : Methanesulfonic acid (MSA) was used as the catalyst to remove trace olefins from aromatics (referred to as oil). The reactions were conducted in a round-bottom flask equipped with a reflux condenser and oil-bath under atmospheric pressure. The influences of the reaction temperature, the mass ratio of MSA to oil, and the reaction time were investigated. The experimental results showed that after a 40 min reaction time at 413 K, the olefins conversion of 89.45% was obtained with a mass ratio of MSA to oil of 6%. The catalyst was reused five times without a reactivation treatment, and the olefins conversion reached 66.02% the fifth time. More importantly, the catalytic mechanism was also proposed in this work. In addition, as MSA is biodegradable, this method represents an environmentally benign route to remove trace olefins from aromatics. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508186