An anionic surfactant-assisted equilibrium adsorption method to prepare highly dispersed Fe-promoted Ni/Al2O3 catalysts for highly selective mercaptan removal

• Published in: Applied catalysis. B, Environmental Vol. 230; pp. 154 - 164
• Main Authors: Huang, Tingting, Peng, Qingyi, Shi, Wenjin, Xu, Jundong, Fan, Yu
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.08.2018
• Subjects: Fe promoter; High dispersion; Mercaptan removal; Ni/Al2O3; Thioetherification catalyst; Fe promoter; Ni/Al2O3; High dispersion; Thioetherification catalyst; Mercaptan removal
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2018.02.053

[Display omitted] •Nickel cations were anchored on Al2O3 support by negatively charged DBS− bilayers.•The as-prepared Ni and NiFe catalysts had highly dispersed metal nanoparticles.•These catalysts had more metal sulfides with superior thioetherification activity.•These catalysts showed excellent performance for highly selective mercaptan removal. This article proposes a novel sodium dodecylbenzenesulfonate (SDBS)-assisted equilibrium adsorption method for preparing highly dispersed Ni/Al2O3 and Fe-promoted NiFe/Al2O3 thioetherification catalysts. The proposed strategy anchors nickel cations onto the electronegative surface of an Al2O3 support modified by negatively charged DBS− bilayers. As a result, this method achieves highly dispersed Ni nanoparticles without strengthening the metal-support interaction, promoting the reducibility and sulfurization of the supported Ni species. The as-prepared Ni-based catalysts have a smaller size, a higher dispersion of metal nanoparticles, and a greater amount of active metal sulfides than their counterparts prepared by the conventional impregnation method, endowing them with excellent catalytic performance for the highly selective removal of mercaptans. This method provides a new opportunity to prepare highly dispersed metal nanoparticles without a strong metal-support interaction.