RT Journal Article
T1 Modulation of the Acidity of HY, HBETA, and HZSM-5 Zeolites by Lanthanum Incorporation for Selective Gasoline Desulfurization in the FCCRiser
A1 Santos, Ronaldo C.
A1 Silva, Anderson Cerqueira dos Santos
A1 Lam, Yiu Lan
A1 Ferreira, Jose Marcos Moreira
A1 Ballesteros-Plata, Daniel
A1 Rodríguez-Castellón, Enrique
A1 Martínez Arribas, Agustin
A1 Pontes, Luiz A. M.
K1 Catálisis heterogénea
K1 Petróleo - Refino
K1 Industria petroquímica
K1 Materiales porosos
K1 Zeolitas
AB This study evaluates the incorporation of lanthanum into zeolitesY, Beta, and ZSM-5 to promote the desulfurization of a gasolinestream directly in the riser of a fluid catalytic cracking (FCC) process.The catalysts were prepared using wet impregnation andcharacterized by X-ray diffraction (XRD) (crystallinity and phaseintegrity), XRF (La content and Si/Al ratio), X-ray photoelectronspectroscopy (XPS), solid state nuclear magnetic resonance(NMR) of 29Si and 27Al, N2 adsorption, high-resolution transmissionelectron microscopy (HRTEM), temperature-programmeddesorption of ammonia (TPD-NH3), Fourier-transform infraredspectroscopy (FTIR), and pyridine chemisorbed FTIR (FTIR-Py).Catalytic tests were conducted in a tubular reactor, using a mixtureof cyclohexane and thiophene (20000 ppm) at 773 K and1.3 atm. Catalytic activity was assessed in a fixed-bed reactorusing a cyclohexane/thiophene feed, and product selectivitieswere quantified by gas chromatography with flame ionizationand sulfur chemiluminescence detectors. The addition of lanthanumaltered the acidity of the catalysts, reducing the totaldensity of acid sites while increasing the strength of Lewis acidsites. The protonated zeolites, particularly HY, facilitated sulfurremoval, achieving a 91% selectivity for H2S through secondaryhydrogen transfer reactions. In contrast, the lanthanum-modifiedzeolites enhanced thiophene alkylation and condensation reactions,as evidenced by the selectivity observed in La/BEA andLa/ZSM-5, which reached 15%. The results indicated that incorporatinglanthanum changes the desulfurization profile, makingthe catalysts more selective for forming higher molecular weightsulfur compounds, thereby shifting the products toward the FCCdiesel range.
PB Wiley
YR 2025
FD 2025-11
LK https://hdl.handle.net/10630/40033
UL https://hdl.handle.net/10630/40033
LA eng
NO R. C. Santos, D. F. Almeida, A. C. dos S. Silva, et al. “ Modulation of the Acidity of HY, HBETA, and HZSM-5 Zeolites by Lanthanum Incorporation for Selective Gasoline Desulfurization in the FCC Riser.” ChemCatChem 17, no. 21 (2025): e00888. https://doi.org/10.1002/cctc.202500888
NO Funding for open access charge: Universidad de Málaga / CBUA
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 19 ene 2026