THE EFFECTS OF CALCINATION AND HYDROTHERMAL CALCINATION ON SOLID-STATE ION EXCHANGE WITH ZEOLITE LaHY

Abstract

Abstract: Batches of LaHY zeolite, prepared with liquid lanthanum ion exchange.The effects of calcination in air and hydrothermal calcination on solid-state ion exchange and catalytic properties of zeolite LaHY were comparatively studied.The samples were characterized by XRD, XRF, 27Al MAS NMR and Py-FTIR.It was found that, compared with calcination in air, La3+ ions migrated into sodalite cages much more easily due to the steaming calcination.The ratio of the peak intensity I₁ of the diffraction plane (311) to the peak intensity I₂ of the diffraction plane (222) (I₁/I₂) increased by 23.8%, and the loss of lanthanum ion decreased from 13% to 6%. At the same time, the crystallization retention of zeolite LaY increased by 6.6 percentage points, the conversion rate of light diesel oil increased by 7.0 percentage points, and the coke yield decreased by 1.2 percentage points after the hydrothermal aging treatment at 800 ℃ and 100% steam for 17 h.

Key words: lanthanum, Y zeolite, calcination, hydrothermal calcination, solid-state ion exchange

References

[1]Nery J G, Giotto M V, Mascarenhas Y P, Cardoso D, Zotin F M Z, Sousa-Aguiar E F. Rietveld refinement and solid state NMR study of Nd-, Sm-, Gd-, and Dy-containing Y zeolites[J]. Microporous Mesoporous Materials, 2000, 41(1-3): 281-289.
[2]Lee, K. X.; ValRE, J. A. Investigation of metal-exchanged mesoporous Y zeolites for the adsorptive desulfurization of liquid fuels[J]. Applied Catalysts, B 2017, 201(2):359-369.
[3]M.Thommes, K.Kaneko, A. V.Neimark,J. P.Olivier,Rodriguez-Reinoso, F.; Rouquerol, J.; Sing, K. S. Physisorption of gases with special reference to the evaluation of surface area and pore size distribution (IUPAC Technical Report)[J].Pure Applied Chemistry 2015,87(5):1051-1069.
[4]J. W. Roelofsen, H. Mathies, R. L. de Groot, P. C. M. van Woerkom and H. Angad Gaur.Fluid catalytic cracking: recent developments on the Grand old lady of zeolite catalysis[J].Stud. Surface ScienceCatalysts, 1988,28(3):337-344.
[5]E.F.Sousa-Aguiar, V.L.D. Camorim, F.M.Z.Zotin, R.L.C.dos Santos.A Fourier transform infrared spectroscopy study of La-, Nd-, Sm-, Gd-and Dy-containing Y zeolites[J].Microporous and Mesoporous Materials,1998,25(1):25-34.
[6]Du J, Zheng L, Wang Y R, Da Z J, Long J, He M Y. Development of structure stabilized SSY zeolite[J]. Study Surfaces Science Catalysts, 2004, 154: 2309-2318.
[7]Lemos F, Ramo?a Ribeiro F, Kern M, Giannetto G, M. Guisnet. Influence of lanthanum content of LaHY catalysts on their Physico-chemical and Catalytic Properties[J].Applied Catalysis A-General, 1988, 39(1): 227-238.
[8]Baillie C, Schiller R. Zero and low rare earth FCC catalysts[M].Petroleum technology quarterly. 2011,16(4):103-108.
[9]Cerqueira H S, Caeiro G, Costa L, Ram?a Ribeiro F. Deactivation of FCC catalysts[J]. J. Mol. Applied Catalysis A-General, 2008, 292(5): 11-18.
[10]Aaron Akah. Effects of Rare Earth Oxides in FCC Catalysts, in Catalyst Reports: Section 4- The Effects of FCC Catalyst Characteristics on FCC Yields and Product Properties[J].Journal of Rare Earths. 2017,35(9):941-956.
[11]Shu Y, Travert A, Schiller R, Ziebarth M, Wormsbecher R, Cheng W C. Effect of ionic radius of rare earth on USY zeolite in fluid catalytic cracking: Fundamentals and commercial application. Top[J]. Catalysts, 2015, 58(4):334-346.
[12]Maugé F, Gallezot P, Courcelle J C, Engelhard P, Grosmangin J. Hydrothermal aging of cracking catalysts. II. Effect of steam and sodium on the structure of LaHY zeolites[J]. Zeolites, 1986, 6(4): 261-267.
[13]Lemos F, Ribeiro F R, Kern M, Giannetto G, Guisnet M. Influence of the cerium content of CeHY catalysts on their physicochemical and catalytic properties[J]. Applied Catalysis A-General, 1987, 29(1): 43-52.
[14]Du X, Zhang H, Li X, Tan Z, Liu H and Gao X.Modulating the local coordination environment of single-atom catalysts for Enhanced catalytic performance[J]. Chinese Journal of Catalysis 2013,34(1):1599-1609.
[15]Edward F.T. Lee, Lovat V.C. Rees.Dehydroxylation of lanthanum exchanged zeolite Y[J]. Zeolites. 1987,34(1):545-548.
[16]万焱波,舒兴田.水蒸气焙烧对REY分子筛性能的影响[J].石油炼制与化工，1997,28(9):20-23．
[17]Lee E F T and Rees L V C .Dehydroxylation of lanthanum exchanged zeolite Y[J].Zeolites, 1987 , 7(4):545-560.
[18]舒兴田，何鸣元等.一种稀土Y分子筛的制备方法；中国，CN1026225C[P] .
[19]Wang N N, Wang Y, Cheng H F, Fu M E, Tao Z and Wu W Z.Relationship between two characteristic diffractions and the status of cationic lanthanum species in zeolite LaNaY[J].J. Porous. Materials 2013 ,20(1):1371-1376.
[20]Du X, Zhang H, Li X, Tan Z, Liu H and Gao X.Further findings on the stabilization mechanism among modified Y zeolite with different rare earth ions[J].Chinese Journal of Catalysis 2014 ,31(3):435-452.
[21]H.S. Cerqueira, G. Caeiro, L. Costa, F. Ram?a Ribeiro. Deactivation of FCC catalysts[J]. Journal of Molecular Catalysis A: Chemical,2008, 292(2):11-24.
[22]G. Giannetto, Zeolitas: Caracteristicas, propiedades aplicaciones industriales,Síntesis de catalizadores bifuncionales bimetálicos Pd/H-ZSM5, Cu/H-ZSM5 Y Pd-Cu/H-ZSM5 por reducción química asistida por microondas[J].Editorial Innovatión Tecnológica, Caracas, 1990, 13(3):52-64.
[23]J.W. Ward. The nature of active sites on zeolites: XV. The influence of nickel cations on the catalytic activity of hydrogen Y zeolite[J].Journal of Catalysis ,1969,13(3): 321-336.
[24]张剑秋．降低汽油烯烃含量的催化裂化新材料探索［D］.北京: 石油化工科学研究院，2001．
[25]Liu C H, Gao X H, Zhang Z D, et al．Surface modification of zeolite Y and mechanism for reducing naphtha olefin formation in catalytic cracking reaction[J].Applied Catalysis A,2004,264(2):225-228.