Ni-CaO Combined Sorbent Catalyst Materials usage for Sorption Enhanced Steam Methane Reforming
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1 Ni-CaO Combined Sorbent Catalyst Materials usage for Sorption Enhanced Steam Methane Reforming A. DI GIULIANO 1,2, J. GIRR 1, C. COURSON 1, A. KIENNEMANN 1,R. MASSACESI 2, K.GALLUCCI 2 1 U n i ve rs i t y o f S t ra s b o u r g, I C P E ES ( EC P M ), F ra n c e 2 U n i ve rs i t y o f L A q u i l a, D I I I E, I ta l y WHEC Zaragoza, 14/06/2016
2 Contents 1. Sorption Enhanced Steam Methane Reforming (SE-SMR) 2. Combined Sorbent-Catalyst Materials (CSCM) 3. CSCM synthesis method 4. CSCM characterization 5. SMR and SE-SMR tests 6. Conclusions 2
3 1. SE-SMR SORPTION ENHANCED STEAM METHANE REFORMING (SE-SMR) (T = 650 C ; P = 1 atm) Steam Metahne Reforming (SMR) CH 4 + H 2 O CO + 3H 2 ΔH K = kj/mol Water Gas Shift (WGS) CO + H 2 O CO 2 + H 2 ΔH K = kj/mol Carbonation CaO (s) + CO 2 CaCO 3(s) ΔH K = kj/mol Regenerated solid CALCIUM LOOPING Solid saturated by CO 2 Calcination CaCO 3(s) CaO (s) + CO 2 ΔH K = J/mol REGENERATION (T = C ; P = 1 atm) [1] Cesario M. et al, Adv. Chem. Lett. 2014, 1, 1-8 [3] Di Giuliano A. et al [2] Martavaltzi C. S. et al, Ind. Eng. Chem. Res. 2011, 50,
4 2. CSCM CO 2 SORBENT + SMR CATALYST = COMBINED SORBENT-CATALYST MATERIAL (CSCM) CaO Ni 0 Mayenite (Ca 12 Al 14 O 33 ) Support CaO - binder Picture from: [3] Phys. Chem. Chem. Phys., 2015, 17,
5 3. CSCM synthesis methods 1) WET MIXING [4,5] MAYENITE OR CAO-MAYENITE Calcination of Ca(CH 3 COO) 2 to CaO (4h ; 750 C) CaO + Al(NO 3 ) 3 9H 2 O Stirring in distilled water (70 C; 1h) 2) WET IMPREGNATION [6,7] NI-MAYENITE OR NI-CAO-MAYENITE Mayenite or CaO-Mayenite + Ni(CH 3 COO) 2 4H 2 O or Ni(NO 3 ) 2 6H 2 O Stirring in distilled water (70 C ; 1h) Drying (12h ; 120 C) Drying (12h ; 120 C) Calcination 1 (4h ; 750 C) Hydratation + Drying (12h ; 120 C) Calcination 2 (1.5h ; 900 C) Calcination (4h ; 900 C) [4] Z. Li et al, Energy & Fuels 19, 2005, [5] I. Zamboni et al. PREPA11, 33 (2014) [6] A. D Orazio et al, Int. J. Hydr. En. 2013, 38, [7] I. Zamboni, Ph.D. thesis, ICPEES
6 4. CSCM Characterization XRD (X-Ray Diffraction): Crystalline phases detection TPR (Temperature Programmed Reduction): Reducibility by H 2 BET method: Specific surface TGA (Thermo-Gravimetric Analysis): Multiple CO 2 -Sorption/Desorption cycles SEM (Scanning Electron Microscope): Morphology 6
7 XRD: Effect of Wet Impregnation Wet Impregnation with both Ni-Acetate and Ni-Nitrate succeed in adding Nickel 7
8 C/min 50 Scm 3 /min (10 % v H 2 in Ar) TPR: Effect of CaO fraction (1) CaO0Ni(Ac)3 and CaO15Ni(Ac)3 have main reduction peaks beyond 800 C (2); CaO30Ni(Ac)3 and CaO45Ni(Ac)3 have their main peak at around 550 C (1) 8
9 C/min 50 Scm 3 /min (10 % v H 2 in Ar) TPR: Effect of CaO fraction (2) CaO0Ni(N)3 and CaO15Ni(N)3 have main reduction peaks beyond 800 C (2); CaO30Ni(N)3 and CaO45Ni(N)3 have their main peak at around 550 C (1) 9
10 2 15 C/min 50 Scm 3 /min (10 % v H 2 in Ar) TPR: Effect of CaO fraction (3) CaO0Ni(N)10 has a large main reduction peak at 880 C (2); CaO30Ni(N)10 and CaO54Ni(N)10 have their peaks between C (1) 10
11 XRD: Effect of TPR (1) For Impregnated mayenite the only modification after TPR in crystalline phases isnio reduction to Ni 11
12 XRD: Effect of TPR (2) For Impregnated supported sorbents the only modification after TPR in crystalline phases is NiO reduction to Ni 12
13 BET method: Effect of Wet Impregnation Wet impregnation improves specific surface of CSCM for CaO fraction in the originating sorbent < 15 % w, and makes the opposite for CaO fraction > 30 % w 13
14 Sorption/Desorption cycle 100 % v N C ; 30 min 15 % v CO % v N C ; 30 min TGA: CO 2 sorption/desorption cycles (1) Both supported sorbents and dolomite have a decrease in CO 2 sorption capacity, but after the 15 th cycle they have a stabilization. 14
15 Sorption/Desorption cycle 100 % N C ; 30 min 15 % CO % N C ; 30 min TGA: CO 2 sorption/desorption cycles (2) CSCM deriving from CaO30 have a decrease in sorption capacity in comparison to their parent sorbent. Wet impregnation with Ni-acetate gives the biggest decrease. 15
16 Sorption/Desorption cycle 100 % N C ; 30 min 15 % CO % N C ; 30 min TGA: CO 2 sorption/desorption cycles (3) CSCM deriving from CaO54 have a decrease in sorption capacity in comparison to their parent sorbent. 16
17 XRD: Effect of TGA Materials are extacted after last CO 2 capture: CaCO 3 is detected, together with residual CaO 17
18 CaO54 CaO54Ni(Ac)3 CaO54Ni(Ac)3 CaO54 post-tga CaO54Ni(Ac)3 post-tga CaO54Ni(Ac)3 post-tga SEM: Morphology All materials from CaO54 show a granular sructure, with grains in an order of magnitude within the range 100 nm 1 µm. This morphology doesn t change after impregnation or after TGA cycles. The same happens for CaO30 18
19 5. SMR andr SE-SMR Tests 19
20 SMR 1: reforming starts at 850 C; after one hour temperature is decreased to 750 C; after another hour temperature is decreased to 650 C SMR 2: reforming starts directly at 650 C SMR tests (Ni-mayenite catalysts) (1): Ni-mayenite produced by Wet Impregnation with Ni-nitrate performed SMR tests. For each material, the same sample performed SMR 1 and then SMR 2, just separated by cooling at room temperature under inert stream. 20
21 Material WHSV Ni χ CH4, SMR1 χ CH4, SMR2 850 C 750 C 650 C 650 C Nl CH4 h -1 g cat -1 % w % % % % CaO0Ni(N) CaO0Ni(N) CaO0Ni(N) CaO0Ni(N) CaO0Ni(N) SMR tests (Ni-mayenite catalysts) (2): CH 4 conversions (χ CH4 ) are influenced by the quantity on Ni available for the same rate of CH 4 fed, and by temperature 21
22 SE-SMR Material WHSV Ni χ CH4, SE-SMR Nl CH4 h -1 g -1 cat % w % CaO54Ni(N) From 39.5 to 10.1 CaO54Ni(N) SE-SMR tests (CSCM) (1): CaO-sorbent with 54 % w of free CaO was impregnated with Ni-nitrate. Resulting CSCM with 3 % w of Ni cannot stably catalyze reforming, while 10 % w of Ni made possible to observe SE-SMR and SMR after sorbent saturation. 22
23 SE-SMR Material WHSV Ni χ CH4, SE-SMR Nl CH4 h -1 g -1 cat % w % CaO30Ni(N) From 48.8 to 11.9 CaO30Ni(N) SE-SMR tests (CSCM) (2): CaO-sorbent with 30 %w of free CaO was impregnated with Ni-nitrate. Resulting CSCM with 3 %w of Ni cannot stably catalyze reforming, while 10 %w of Ni made possible to observe SE-SMR and SMR after sorbent saturation. 23
24 SE-SMR SE-SMR Material WHSV Ni χ CH4, SE-SMR Nl CH4 h -1 g -1 cat % w % CaO30Ni(N) CaO15Ni(N) SE-SMR tests (CSCM) (3): CaO-sorbent with 15 % w of free CaO was impregnated with Ni-nitrate. Resulting CSCM with 3 % w of Ni made possible to observe SE-SMR and SMR after sorbent saturation, having a trend similar to CaO30Ni(N)10. 24
25 Material WHSV Ni χ CH4, SE-SMR 650 C Nl CH4 h -1 g cat -1 % w % CaO54Ni(N) From 39.5 to 10.1 CaO54Ni(N) CaO30Ni(N) From 48.8 to 11.9 CaO30Ni(N) CaO15Ni(N) SMR tests (CSCM) (4): In CSCM from sorbents with 30 % w of free CaO or more, χ CH4 and catalysis stability are influenced by available Ni, for the same rate of CH 4 fed. Decreasing free CaO to 15 % w makes possible to catalyze SE-SMR with 3 % w of Ni 25
26 6. Conclusions XRD shows that Wet mixing and Wet impregnation are effective in producing CaO-mayenite sorbents, Ni-mayenite catalysts and Ni-CaO-mayenite CSCM TPR and XRD reveal that the only crystalline phase modification (in reducing atmosphere) is NiO reduction to Ni and that this reaction is influenced by CaO fraction BET method shows that Wet impregnation improves specific surface of CSCM for CaO fraction in the originating sorbent < 15 % w, and makes the opposite for CaO fraction > 30 % w Multicycle Ca-looping performed in TGA show a decrease in CO 2 sorption capacity of CaOmayenite and Ni-CaO-mayenite in first 15 cycles; after that stabilization at acceptable values occurs Reactivity tests on microreactor scale show that: Ni-mayenite with different loads of Ni (from 10 % w to 3 % w ) can catalyze successfully SMR Ni-CaO-mayenite CSCM can perform SE-SMR For Ni-impregnated sorbents with 30 % w of free CaO of more, a 3 % w Ni load is not sufficient to catalyze SE-SMR and SMR, while a 10 %w Ni load is For Ni-impregnated sobent with 15 % w of free CaO, a 3 % w Ni load is sufficient to catalyze SE-SMR and SMR 26
27 Thanks for your attention The research leading to these results has received funding from the European Union s Seventh Framework Program ASCENT grand agreement n [608512] 27
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