Dual rare earth-doped Pt–Sn/Al2O3 catalysts with synergistic Ce and Sm effects on high-efficiency aromatization and coke suppression in naphtha reforming
Year: 2025
Type: article
Abstract: In the present study, the effect of rare earth (RE) metals of Ce and Sm on the naphtha reforming process catalyst, i.e., Pt-Sn/γ-Al 2 O 3, is investigated. Two-, three-, and four-metal catalysts were synthesized through the successive wet impregnation of the support, employing various concentrations of cerium at 0.17 and 0.47 wt% and samarium at 0.33, 0.51, and 0.87 wt%. The corresponding catalytic activity on the naphtha reforming reactions was conducted in a reactor at 5 bar, 500 ℃, and WHSV = 2 h − 1 . FESEM, BET, NH 3 -TPD, and H 2 -TPR were employed to scrutinize the physicochemical and active site properties of the developed catalysts. Besides, TGA was used to determine the deactivation rate of the developed catalysts. It is shown that adding a suitable amount of RE metals can reduce the Pt particle agglomeration and promote the distribution of the metal particles. Catalytic testing demonstrated that Ce and Sm-containing catalysts, especially SPC(0.47)S(0.33), exhibited superior aromatization activity, producing high levels of C 8 and C 9 aromatics, which are valuable for gasoline blending. Such catalysts also showed reduced cracking and paraffin production, which was attributed to the optimal balance of metallic and acidic properties resulting from the REMs. In addition, such RE dopants could diminish the degree of graphitization, resulting in decreased coke content and a lower combustion temperature, facilitating the catalyst regeneration process. Moreover, incorporating RE metals could inhibit the reduction of tin oxides, enhancing platinum’s role as the promoter. Besides, the catalysts containing 0.47 wt% cerium, 0.33 wt% samarium and a combination of both RE metals exhibited superior activity in producing reformate with a high-octane number.
Source: Scientific Reports
Authors: Farhad Keivanimehr, Roshanak Kabiri, Sajjad Habibzadeh, Maryam Mokhtarian
Institution: Amirkabir University of Technology
Language: English
Subfield: Inorganic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,690
OpenAlex ID: W4411094698