Đồng phân hóa n hexane trên xúc tác PdHZSM 5 và pt HZSM 5 biến tính cu và ni

I H C QU C GIA TP.HCM I H C BÁCH KHOA NGUY N TH H NG TRANG -HEXANE TRÊN XÚC TÁC Pd/HZSM-5 VÀ Pt/HZSM-5 Chuyên ngành: K Thu t Hóa D u Mã s : 605355 LU CS I H C QU C GIA TP.HCM I H C BÁCH KHOA NGUY N TH H NG TRANG -HEXANE TRÊN XÚC TÁC Pd/HZSM-5 VÀ Pt/HZSM-5 Chuyên ngành: K Thu t Hóa D u Mã s : 605355 LU CS : Hóa h - Vi Cán b - Xúc tác - Vi àn lâm KH CN Vi ng d n khoa h c: GS.TSKH mL c Cán b ch m nh n xét 1: PGS TS Hu nh Quy n Cán b ch m nh n xét 2: TS Ngô Thanh An Lu cs cb ov t ih ngày 06 tháng Thành ph n H cs m: GS.TSKH Ph m Quang D PGS.TS Hu nh Quy n TS Ngô Thanh An mL c TS Nguy n H Xác nh n c a Ch t ch H ngành sau lu CH T CH H ã ng Khoa qu n lý chuyên c s a ch a (n u có) NG GS.TSKH Ph m Quang D NG KHOA I H C QU C GIA TP.HCM C NG HÒA XÃ H I CH NGH KHOA TP.HCM T NAM c l p - T - H nh phúc NHI M V LU CS H tên h c viên: NGUY N TH H NG TRANG MSHV: 11404207 ng Chuyên ngành: K thu t Hóa d u Mã s : 605355 TÀI NG PHÂN HÓA n-HEXANE TRÊN XÚC TÁC Pd/HZSM-5 VÀ Pt/HZSM-5 NHI M V VÀ N I DUNG M c tiêu c a lu nickel) làm sáng t , ( - Pt/HZSM-5 c tác Pd/HZSM-5 -hexane : - -hóa 0,8Pd/HZSM-5 - ch -hóa 0,35Pt/HZSM-5 o sánh v ành ph - 0,8Pd/HZSM-5 0,35Pt/HZSM-5 - 0,8Pd/HZSM-5 0,35Pt/HZSM-5 atm atm II NGÀY GIAO NHI M V : 24/06/2013 III NGÀY HOÀN THÀNH NHI M V : 22/11/2013 IV CÁN B CÁN B NG D N: NG D N mL c ML C CH NHI M B PGS.TS Nguy n V NG KHOA O L tài lu thành sâu s ýt c tiên xin g i l i c m GS.TSKH mL c ã truy t cho nh ng ng khoa h c, nh ng ki n th c quý báu g n li n v i lu t n tình h chân u ã ng d n su t th i gian h c t p th c hi n lu Xin chân thành c Nguy n Trí q Th y, Cơ phịng D u khí - Xúc tác phịng Q trình Thi t b , Vi n Cơng ngh Hóa h c t o m i u ki n thu n l tơi hồn thành lu Xin c y, Cô b môn K thu t hóa d u thu c Khoa K thu t Hóa h i h c Bách Khoa - ãt u ki n c h c t p, nghiên c u trau d i ki n th c su t th i gian h c t p th c hi n lu Xin chân thành c dành chút th i gian c a y, Cơ h ng ch m lu ã n xét quý báu giúp hoàn thi Sau l i c nghiên c u, chia s ki n th ình b n bè, nh ng hành công vi c cu c s ng TP H Chí Minh, ngày 06 tháng 01 Nguy n Th H ng Trang TÓM T -Hexane xúc tác Pd/HZSM-5 Pt/HZSM-5 Cu Ni” th c hi n nh ng n - , -hóa 0,8Pd/HZSM-5 - , -hóa tính xúc tác 0,35Pt/HZSM-5 atm ành ph - 0,8Pd/HZSM-5 0,35Pt/HZSM-5 - 0,8Pd/HZSM-5 0,35Pt/HZSM-5 atm atm T n i dung có th rút k t lu n sau: - 1,05% Ni - atm, Pt/HZSM-5 Pd 0,35Pt1,05Ni > 0,8Pd1,05Ni (>30 , ), - : 0,8Pd1,05Ni 0,35Pt1,05Ni (12 /HZSM-5 Pt/HZSM-5 ( bi ) x ) atm giúp làm tác 0,8Pd1,05Ni, ph 0,35Pt1,05Ni so atm Tuy nhiên, tác 0,35Pt1,05Ni/HZSM-5 atm) ) 12 ( atm) lên > 30 ( 0,8Pd1,05Ni/HZSM-5 cao (>30 ABSTRACT The goal of thesis is to study the n-Hexane hydroisomerization over Pd/HZSM-5 and Pt/HZSM-5 catalysts promoted by Ni and Cu The contents of research include the following contents: - The catalyst 0.8Pd/HZSM-5 promoted by Ni and Cu was obtained by impregnated method The amount of Ni and Cu was varied in range of 0.5 1.5 wt.% Physico-chemical properties of samples were studied by the following methods: BET adsorption, X-ray powder diffraction (XRD), temperatureprogrammed reduction (TPR), adsorption-desorption ammonia (TPD-NH3) - The reaction was performed at atmospheric pressure in order to find optimal content of additive - Investigating the activity of catalyst 0.35Pt/HZSM-5 promoted by additives - Studying the activity of promoted Pd/HZSM-5 and Pt/HZSM-5 with the optimal additives content at atm - Studying the stability of catalysts with the optimal composition at atmospheric and atm pressures - Determining the amount of coke formation and composition of coke The following results have been obtained from this research: - The optimal content of the promoter is 1.05wt.% Ni - At atmospheric pressure, the sample of 0.35Pt1.05Ni/HZSM-5 gave maximum yield i-C6 and the stability of 12 hours Meanwhile, 0.8Pd1.05Ni/HZSM-5 expressed lower acitivity compared to 0.35Pt1.05Ni, but it had the remarkable higher stability (over 30 hours) - Increasing pressure to atm led to the improvement in activity of 0.8Pd1.05Ni catalyst, but made the activity of 0.35Pt1.05Ni catalyst to be lower However, the stability of 0.35Pt1.05Ni is improved from 12 hours (1 atm) to over 30 hours and the life time of 0.8Pd1.05Ni is still over 30 hours M CL C i ii DANH M HÌNH iv vi 1.1 [1, 2] 1.2 M - -5 1.2.1 1.2.2 [3, 4] 1.2.3 tính xúc tác [5] 1.2.4 [6, 7] 1.2.5 [8, 9] 1.3 1.3.1 1.3.2 1.3.3 Xúc PtCu 12 1.4 Hi 1.4.1 Hi 13 ình h 1.4.2 Hi 14 15 TH 2.1 M 19 ÀI VÀ N 20 2.1.1 M ài 20 2.1.2 N 20 2.2 2.2.1 21 -5 21 2.2.2 /HZSM-5 Pt/HZSM-5 21 2.3 NGHIÊN C - HÓA C 2.3.1 Thành ph 24 2.3.2 Hình thái b 24 2.3.3 24 (TPR) 25 2.3.4 Di êng xúc tác (BET) 26 2.3.5 M -NH3) 28 2.4 31 2.5 , N 35 2.5.1 35 2.5.2 35 38 3.1 TÍNH CH LÝ- 39 3.1.1 Thành ph 39 3.1.2 40 3.1.3 K 3.1.4 Di 3.1.5 M 3.2 HO tác 41 êng c 43 id (TPD) 44 TÁC TRONG PH n-HEXANE 45 3.2.1 Pt/HZSM-5 -5 -hexan atm 45 74 u ki n áp su t ph n b n th t tính t s n ph m l ng có ch s T nh nhi hành (nhi u phân tích t tr i v ho , ho ng vùng nhi so v i xúc tác PtNi trên, ta th y xúc tác 0,8Pd1,05Ni/HZSM-5 có b n, kh u ki n v n áp su t th p) bàn lu 75 ki 76 4.1 K Trong lu ã có 11 m u ch K t h p nghiên c u tính ch t lý-hóa c a xúc tác b XRD, TEM, TPR, BET TPD v i kh o sát ho t tính c a xúc tác ph n ng isomer hóa n-hexane u ki n ph n ng (t l H2/n-C6 = 5,92, t t ng lít/gi , mxt = 1,0 g, T = 225 dòng 350 C, P = atm atm) cho phép rút m t s k t lu - - hoá, ho tác Pd/HZSM-5 Pt/HZSM-5 atm: vi tính xúc tác Pd Pt b HZSM-5 qu ên ch kh -5 không làm thay m ;t /HZSM-5 Pt/HZSM-5 250 âm acid gi 275o - - hoá, ho tác Pd/HZSM-5 Pt/HZSM-5 atm: thêm Cu vào Pd/HZSMzeolite gi m lo gi tính v áp su có tác d t ên atm có tác d c ên h ên h -5 -5 Tuy nhiên, áp su làm gi giúp 4.2 KI - Kh n-hexane -5 ph atm nguyên li ki 77 hu v ìm hi 0,8Pd1,05Ni/HZSM-5 - Nghiên c ph ùng nhóm v Pd/HZSM-5 Pt/HZSM-5 cho ph - ìm ph gia t Các cơng b n lu ,L Th Nguy o Pd/HZSM-5 Pt/HZSM-5 bi -Hexane xúc tác Cu," Xúc tác H vol 2, pp 169-175, 2013 Dao Thi Kim Thoa, Luu Cam Loc, Nguyen Thi Hong Trang, Tran Van Phat, Nguyen Tri, "n-Hexane isomerization over Pd/HZSM-5 zeolite promoted by Co, Ni and Cu," presented at the The 4th International Workshop on Nanotechnology and Application, Vung Tau, 14th-16th November, 2013 ki 78 DANH M ÌNH KHOA H Danh m ình khoa h 79 [1] G Valavarasu and B Sairam, "Light naphtha isomerization process: a review," Petroleum Science and Technology, vol 31, pp 580-595, 2013 [2] V M Akhmedov and S H A Khowaiter, "Recent advances and future aspects in the selective isomerization of high n-alkanes," Catalysis Reviews: Science and Engineering, vol 49, pp 33-139, 2007 [3] D.H Olson, G.T Kokotailo, S.L Lawton, and W M Meler, "Crystal structure and structure related properties of ZSM-5," J Phys Chem., vol 85, pp 2238-2243, 1981 [4] J Abbot, A Corma, and B W Wojciechowski, "The catalytic isomerization of 1- hexene on H-ZSM-5 zeolite: The effects of a shape selective catalyst," Journal of Catalysis, vol 92, pp 398-408, 1985 [5] S Y Ches and W E G Woon, "Some catalytic properties of ZSM-5, a new shape selective zeolite," Journal of Catalysis, vol 52, pp 453-458, 1978 [6] F R Ali A Rownaghi, Jonas Hedlund, "Selective formation of light olefin by n-hexane cracking over HZSM-5: Influence of crystal size and acid sites of nano and micrometer sized crystals," Chemical Engineering Journal, vol 191, pp 528- 533, 2012 [7] B Wang, "Zeolite deactivation during hydrocarbon reactions: Characterisation of coke precursors and acidity, product distribution," Doctor of Philosophy, Department of Chemical Engineering, University College London, 2007 [8] R Borade, A Sayari, A Adnot, and S Kaliaguine, "Characterization of acidity in ZSM-5 zeolites: An X-ray photoelectron and IR spectroscopy study," J Phys Chem., vol 94, pp 5989-5994, 1990 [9] L R Aramburo and L Karwacki, "The porosity, acidity, and reactivity of dealuminated zeolite ZSM-5 at the single particle level: The influence of the zeolite architecture," Chem Eur J., vol 17, pp 13773-13781, 2011 [10] D Karthikeyan, N Lingappan, B Sivasankar, and N J Jabarathinam, "Activity and selectivity for hydroisomerisation of n-decane over Ni Tài li 80 impregnated Pd/H-Mordenite catalysts," Applied Catalysis A, vol 345, pp 18-27, 2008 [11] D Karthikeyan, N Lingappan, and B Sivasankar, "Effect of Ni in -zeolite on hydroisomerization of n-decane," Korean J Chem Eng, vol 25(5), pp 987-997, 2008 [12] D Karthikeyan, N Lingappan, and B Sivasankar, "Hydroisomerization of n-octane over bifunctional Ni-Pd/HY zeolite catalysts," Ind Eng Chem Res, vol 47, pp 6538-6546, 2008 [13] I Eswaramoorthi and N Lingappan, "Hydroisomerisation of n-hexane over bimetallic bifunctional silicoaluminophosphate based molecular sieves," Applied Catalysis A, vol 245, pp 119-135, 2003 [14] M H Jordao, V Simoes, A Montes, and D Cardoso, "Bifunctional Ni, Pt zeolite catalysts for the isomerization of n-hexane," Studies in Surface Science and Catalysis, vol 130, pp 2387-2392, 2000 [15] C M N Yoshioka, T Garetto, and D Cardoso, "n-Hexane isomerization on Ni-Pt catalysts/supported on HUSY zeolite: The in content," Catalysis Today, vol 107-108, pp 693-698, 2005 [16] F V Barsi and D Cardoso, "Bimetallic Pt-Ni catalysts supported on USY zeolite for n-hexane isomerization," Brazilian Journal of Chemical Engineering, vol 26, pp 353-360, 2009 [17] C M N Yoshioka, M H Jordão, D Zanchet, T F Garetto, and D Cardoso, "A new activation process of bimetallic catalysts and application to the n-hexane isomerization," Applied Catalysis A, vol 355, pp 20-26, 2009 [18] I Eswaramoorthi and N Lingappan, "Ni–Pt/H-Y zeolite catalysts for hydroisomerization of n-hexane and n-Heptane," Catalysis Letters, vol 87, pp 133-142, 2003 [19] M A A Aziz, N H N Kamarudin, H D Setiabudi, H Hamdan, A A Jalil, and S Triwahyono, "Negative effect of Ni on PtHY in n-pentane isomerization evidenced by IR and ESR studies," Journal of Natural Gas Chemistry, vol 21, pp 29-36, 2012 Tài li 81 [20] I Eswaramoorthi, A G Bhavani, and N Lingappan, "Activity, selectivity and stability of Ni–Pt loaded zeolite-Beta and mordenite catalysts for hydroisomerisation of n-heptane," Applied Catalysis A, vol 253, pp 469486, 2003 [21] A Fúnez, A D Lucas, P Sánchez, M J Ramos, and J Valverde, "Hydroisomerization in liquid phase of a refinery naphtha stream over PtNi/H-beta zeolite catalysts," Chemical Engineering Journal, vol 136, pp 267-275, 2008 [22] A Martin, J M Silva, F R Ribeiro, and M F Ribeiro, "Hydroisomerization of n-hexane over Pt-Ni/HBEA using catalysts prepared by different methods," Catalysis Letters, vol 109, pp 83-87, 2006 [23] P M Lima, T Garettob, C L C Jr., and D Cardosod, "Isomerization of nhexane on Pt–Ni catalysts supported on nanocrystalline H-BEA zeolite," Catalysis Today, vol 172, pp 195-202, 2011 [24] H C D Jongste and V Ponec, "Role of Cu the hydrogenolysis of Pentane on Cu Alloy catalysts," Journal of Catalysis, vol 63, pp 389-394, 1980 [25] H C D Jongste, V Ponec, and F G Gault, "Influence of alloying Pt with Cu on the reaction mechanisms of hydrocarbon reforming reactions," Journal of Catalysis, vol 63, pp 395-403, 1980 [26] M J P Botman, H C D Jongsté, and V Ponec, "Chemisorption complexes in the reactions of neohexane on Platinum - Copper alloy catalysts," Journal of Catalysis, vol 68, pp 9-16, 1981 [27] A Auroux, Y B Taarit, M Lokolo, P Meriaudeau, and C Naccache, "PtCu bimetallics in HY zeolite: microcalofimetric study of the effect of Copper on the catalyst acidity," Studies in Surface Science and Catalysis, vol 105, pp 1405-1412, 1997 [28] L Tebassi, A Sayari, and A Ghorbel, "Les clusters bimetalliques Pt-Cu, IrCu et Ru-Cu supportes par une zeolite NaY: proprietes physicochimiques et catalytiques," Journal of Molecular Catalysis, vol 25, pp 397-408 1984 Tài li 82 [29] Z Karpinski, W Juszczyk, and J Stachurs, "Isomerization of alkanes on epitaxially oriented (111) Pd-Cu and Pd-Ag alloy films," J Chem.SOC., Faraday Trans, vol 81, pp 1447-1454, 1985 [30] L Guczi, Z Schay, G Stefler, L F Liotta, G Deganello, and A M Veneziay, "Pumice supported Cu–Pd catalysts: Influence of Copper on the activity and selectivity of Palladium in the hydrogenation of phenylacetylene and but-1-ene," Journal of Catalysis, vol 182, pp 456-462, 1999 [31] W M H Sachtler, "Selectivity and rate of activity decline of bimetallic catalysts," Journal of Molecular Catalysis, vol 25, pp 1-12, 1984 [32] V Pone, "Surface chemistry and catalysis on some Platinum bimetallic catalysts," American Chemical Society, pp 267-279, 1985 [33] Giulianomoretti and W M H Sachtler, "Characterization and catalysis of Pt-Cu clusters in NaY," Journal of Catalysis, vol 15, pp 205-216, 1989 [34] B Coq and F Figueras, "Structure activity relationships in catalysis by metals: some aspects of particle size, bimetallic and supports effects," Coordination Chemistry Reviews, vol 178-180, pp 1753-1783, 1998 [35] J A Rodriguez and D W Goodman, "Surface sclence studies of the electronic and chemlcai properties of bimetallic systems," J Phys Chem B, vol 95, pp 4196-4206, 1991 [36] K W Park, J H Choi, and Y E Sung, "Structural, chemical, and electronic properties of Pt/Ni thin film electrodes for methanol electrooxidation," J Phys Chem B, vol 107, pp 5851-5856, 2003 [37] L Guczi and D Bazin, "Structure and selectivity of metal catalysts: revisiting bimetallic zeolite systems," Applied Catalysis A, vol 188, pp 163-174, 1999 [38] J Batista, A Pintar, J P Gomilšek, A Kodre, and F Bornette, "On the structural characteristics of alumina-supported Pd–Cu bimetallic catalysts," Applied Catalysis A, vol 217, pp 55-68, 2001 Tài li 83 [39] W Tang, L Zhang, and G Henkelman, "Catalytic activity of Pd/Cu random alloy nanoparticles for oxygen reduction," J Phys Chem Lett., vol 2, pp 1328-1331, 2011 [40] B Yang, R Burch, C Hardacrea, G Headdock, and P Hu, "Influence of surface structures, subsurface carbon and hydrogen and surface alloying on the activity and selectivity of acetylene hydrogenation on Pd surfaces: A density functional theory study," Journal of Catalysis, vol 305, pp 264-276, 2013 [41] P N Thu n, "Nghiên c i u ch xúc tác Pd Pt mang ch t mang HZSM5 -Al2O3 cho ph n lý thuy t hóa lý, C [42] ng phân hóa n-Hexane," Th c S , 2012 A M Molenbroek, S Haukka, and B S Clausen, "Alloying in Cu/Pd nanoparticle catalysts," J Phys Chem B, vol 102, pp 10680-10689, 1998 [43] P P Singh, "Relativity and magnetism in Ni–Pd and Ni–Pt alloys," Journal of Magnetism and Magnetic Materials, vol 261, pp 347-352, 2003 [44] A L L Levy, C O Veloso, M Castier, and M A P D Silva, "Hydrogenation of aromatics over Ni-Pd zeolites," presented at the 2nd Mercosur Congress on Chemical Engineering - 4th Mercosur Congress on Process Systems Engineering, Brazil [45] Ya-Hue, Chin, and D E Resasco, "Catalytic oxidation of methane on supported Palladium under lean conditions: Kinetics, structure and properties," Catalysis, vol 14, pp 1-39, 1999 [46] J Hagen, Industrial Catalysis vol 129 Wiley-VCH Verlag GmbH & Co KGaA, Weinheim, 2006 [47] Jozsef, L Margitfalvi, and S Gobolos, "Role of metal ion metal nanocluster ensemble sites in activity and selectivity control," Catalysis, vol 17, pp 1352, 2004 [48] A Sayari, Y Yang, and X Song, "Hydrogen effect on n-butane isomerization over Sulfated Zirconia based catalysts," Journal of Catalysis, vol 167, pp 346-353, 1997 Tài li 84 [49] T Jiang, T Wang, L Ma, Y Li, Q Zhang, and X Zhang, "Investigation on the xylitol aqueous-phase reforming performance for pentane production over Pt/HZSM-5 and Ni/HZSM-5 catalysts," Applied Energy, vol 90, pp 51-57, 2012 [50] N D Trung, " Pd, Pt ph n ng c a ch n tính ch t ho t tính xúc tác ng phân hóa h n h p n-Pentan n-Hexan su t cao," Th c S , Hóa Lý Thuy t Hóa Lý, Khoa H c T áp Nhiên Tp.HCM, 2013 [51] Y Rezgui and M Guemini, "Hydroisomerization of n-decane over Ni–Pt–W supported on amorphous silica–alumina catalysts," Applied Catalysis A, vol 374, pp 31-40, 2010 [52] C A Querini, "Coke characterization," Catalysis, vol 17, pp 166-209, 2004 [53] M R H Siddiquia, S Holmes, H He, W Smith, E N Coker, M P Atkins, et al., "Coking and regeneration of Palladium doped H3PW12O40/SiO2 catalysts," Catalysis Letters, vol 66, pp 53-57, 2000 [54] Z Hou, B Han, J Zhang, Z Liu, J He, X Zhang, et al., "n-pentane isomerization in different phase regions near the critical temperature," Journal of Supercritical Fluids, vol 25, pp 81-90, 2003 [55] K Ebitani, J Konishi, and H Hattori, "Skeletal isomerization of hydrocarbons over Zirconium oxide promoted by Platinum and Sulfate ion," Journal of Catalysis, vol 130, pp 257-267, 1991 [56] R A Comelli, Z R Finelli, S R Vaudagna, and N S Fígoli, "Hydroisomerization of n-hexane on Pt/SO42- ZrO2: effect of total and hydrogen partial pressure," Catalysis Letters, vol 45, pp 227-231, 1997 [57] J M Manoli, C Potvin, M Muhler, U Wild, G Resofszki, T Buchholz, et al., "Evolution of the catalytic activity in Pt/Sulfated Zirconia Catalysts: Structure, composition, and catalytic properties of the catalyst precursor and the calcined catalyst," Journal of Catalysis, vol 178, pp 338-351, 1998 Tài li 85 [58] H D Setiabudi, A A Jalil, S Triwahyono, N H N Kamarudin, and R Jusoh, "Ir/Pt-HZSM5 for n-pentane isomerization: Effect of Si/Al ratio and reaction optimization by response surface methodology," Chemical Engineering Journal, vol 217, pp 300-309, 2013 [59] C L Li, O Novaro, E Muñoz, J L Boldú, X Bokhimi, J A Wang, et al., "Coke deactivation of Pd/H-mordenite catalysts used for hydroisomerization," Applied Catalysis A, vol 199, pp 211-220, 2000 Tài li C5/C6 86 PH PH L C 1: THÀNH PH N PHA C A XÚC TÁC (XRD) Ph l c 1.1 Ph XRD c a xúc tác 0,8Pd0,5Ni/HZSM-5 Ph l c 1.2 Ph XRD c a xúc tác 0,8Pd1,05Ni/HZSM-5 Ph 87 Ph l c 1.3 Ph XRD c a xúc tác 0,8Pd1,5Ni/HZSM-5 Ph l c 1.4 Ph XRD c a xúc tác 0,35Pt1,05Ni/HZSM-5 Ph 88 Ph l c 1.5 Ph XRD c a xúc tác 0,8Pd1,05Cu/HZSM-5 Ph ... xúc tác Pd /HZSM -5 Pt/ HZSM -5 Cu B M u xúc tác PdNi /HZSM -5 PtNi /HZSM -5 PdCu /HZSM -5 2.2 Ký hi thành ph ng kim lo i (%) Ký hi u Ni = 0 ,5; Pd = 0,8 0,8Pd0, 5Ni /HZSM -5 Ni = 0, 75; Pd = 0,8 0,8Pd0,7 5Ni/ ... 0,8Pd0,7 5Ni/ HZSM -5 Ni = 1, 05; Pd = 0,8 0,8Pd1,0 5Ni/ HZSM -5 Ni = 1,09; Pd = 0,8 0,8Pd1,0 9Ni /HZSM -5 Ni = 1 ,5; Pd = 0,8 0,8Pd1, 5Ni /HZSM -5 Ni = 1, 05; Pt = 1, 05 0,3 5Pt1 ,0 5Ni /HZSM -5 Cu = 0 ,5; Pd = 0,8... , -hóa tính xúc tác 0,3 5Pt/ HZSM -5 atm ành ph - 0,8Pd /HZSM -5 0,3 5Pt/ HZSM -5 - 0,8Pd /HZSM -5 0,3 5Pt/ HZSM -5 atm atm T n i dung có th rút k t lu n sau: - 1, 05% Ni - atm, Pt/ HZSM -5 Pd 0,3 5Pt1 ,05Ni