Reforming and cracking of CH 4 over Al 2 O 3 supported Ni, Ni-Fe and Ni-Co catalysts

Ray, K.K.; Sengupta, Samik; Deo, Goutam

doi:10.1016/j.fuproc.2016.11.003

Cited by 77 publications

(50 citation statements)

References 51 publications

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“…In particular, the Fe-doped sample presents a remarkable high value for Ni/Al which indicates a strong enrichment of Ni atoms on the catalyst's surface. Therefore, we can clearly state that Fe addition boosts Ni dispersion as we intended with this promoter and in good agreement with previous results in literature for dry reforming using Ni-Fe catalysts [22]. Similarly, the Ce/Al ratio is higher (almost double) for Cr and Fe doped catalysts in comparison with the non-promoted Ni/CeAl sample evidencing the benefits for ceria dispersion.…”

Section: Xps Characterization Of Reduced Catalystssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

“…Indeed, bimetallic combinations have proved better performance than their individual components alone [22]. For Ni-Fe materials, it was found that the catalytic activity in the dry reforming of methane increased as compared with monometallic Ni, since a larger Ni dispersion could be achieved [22]. Besides, because of the electronic effect created via metal-metal interactions, the formation of nickel carbide (coke precursor) could be largely avoided, thus leading to less deactivation occurring [23].…”

Section: Introductionmentioning

confidence: 99%

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Highly efficient Ni/CeO2-Al2O3 catalysts for CO2 upgrading via reverse water-gas shift: Effect of selected transition metal promoters

Yang

Pastor‐Pérez

et al. 2018

Applied Catalysis B: Environmental

151

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In the context of Carbon Capture and Utilisation (CCU), the catalytic reduction of CO 2 to CO via reverse watergas shift (RWGS) reaction is a desirable route for CO 2 valorisation. Herein, we have developed highly effective Ni-based catalysts for this reaction. Our study reveals that CeO 2 -Al 2 O 3 is an excellent support for this process helping to achieve high degrees of CO 2 conversions. Interestingly, FeO x and CrO x , which are well-known active components for the forward shift reaction, have opposite effects when used as promoters in the RWGS reaction. The use of iron remarkably boosts the activity, selectivity and stability of the Ni-based catalysts, while adding chromium results detrimental to the overall catalytic performance. In fact, the iron-doped material was tested under extreme conditions (in terms of space velocity) displaying fairly good activity/stability results. This indicates that this sort of catalysts could be potentially used to design compact RWGS reactors for flexible CO 2 utilisation units.

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Section: Xps Characterization Of Reduced Catalystssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Highly efficient Ni/CeO2-Al2O3 catalysts for CO2 upgrading via reverse water-gas shift: Effect of selected transition metal promoters

Yang

Pastor‐Pérez

et al. 2018

Applied Catalysis B: Environmental

151

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“…Methane, ethane and carbon dioxide conversations are calculated as follows [Eqs. (1)–]:,,

true α ((), {CH}_{4}) = \frac{V_{{CH}_{4} in} - V_{{CH}_{4} out}}{{normalV}_{{CH}_{4} in}} \times 100 %

true α ((), C_{2} H_{6}) = \frac{V_{C_{2} H_{6} in} - V_{C_{2} H_{6} out}}{{normalV}_{{normalC}_{2} {normalH}_{6} in}} \times 100 %

true α ((), {CO}_{2}) = \frac{V_{{CO}_{2} in} - V_{{CO}_{2} out}}{{normalV}_{{CO}_{2} in}} \times 100 %

…”

Section: Methodsmentioning

confidence: 99%

“…The other necessary parameters, including CO selectivity S(CO) and H 2 selectivity S(H 2 ) are calculated as follows [Eqs. (4) and ]:,,

true normalS ((), CO) = \frac{{normalV}_{COout}}{((), V_{{CH}_{4} in} - V_{{CH}_{4} out}) + 2 \times ((), V_{C_{2} H_{6} in} - V_{C_{2} H_{6} out}) + ((), V_{{CO}_{2} in} - V_{{CO}_{2} out})} \times 100 %

true normalS ((), {normalH}_{2}) = \frac{{normalV}_{{normalH}_{2} out}}{2 \times ((), V_{{CH}_{4} in} - V_{{CH}_{4} out}) + 3 \times ((), V_{C_{2} H_{6} in} - V_{C_{2} H_{6} out})} \times 100 %

…”

Section: Methodsmentioning

confidence: 99%

Dry Reforming of Shale Gas and Carbon Dioxide with Ni‐Ce‐Al₂O₃ Catalyst: Syngas Production Enhanced over Ni‐CeO_x Formation

Liu

Akhtamberdinova

et al. 2018

ChemCatChem

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The dry reforming of shale gas (methane and ethane with an average ratio of 4 : 1) with carbon dioxide (DRS) is considered to be a promising way to produce syngas, which widens the utilization of shale gas and mitigates carbon dioxide emission. In this paper, Ce modified Ni‐based catalysts were developed and the corresponding catalytic performances for DRS were investigated with a fixed bed reactor. Results showed that the catalyst containing 5 wt% of Ni and 5 wt% of Ce performed a best catalytic effect, including the selectivity of syngas and the carbon resistance performance, which is due to the good metal dispersion, strong interaction between Ni and Ce, and the formation of Ni‐CeOx solid solution. The electron transfer between Ni and Ce, substitution of Ni for Ce, and the sequential oxygen vacancies or defects, play significant roles in activating CH4, C2H6 and CO2. The conversion of reactant gas increased with temperature, while the selectivity of syngas is little affected with temperature. In addition, the desired catalyst containing 5 wt% of Ni and 5 wt% of Ce showed good stability in the long‐time operation, which indicates that the Ce modified Ni‐based catalyst is a promising one for the dry reforming of shale gas.

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Development of Co Supported on Co−Al Spinel Catalysts from Exsolution of Amorphous Co−Al Oxides for Carbon Dioxide Reforming of Methane

et al. 2019

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In this study, redox exsolution method was used to synthesize Co/Co−Al spinel for dry reforming. The aim is to improve metal‐support interaction, which enhances the catalyst's stability and minimizes carbon deposition. The synthesized catalysts were observed as Co embedded on Co deficient CoAl2O4‐like spinel (denoted as Co−Al spinel). The reduction temperature was optimized at 750 °C. Investigations on the effect of Co loading revealed that optimum Co loading is needed to control the Co particle size, providing balance between limiting carbon deposition rate and preventing dissolution of Co into the support. The best performing catalyst, Co‐15, in which the molar ratio of Co and Al is 15 : 85 produced a stable 81.5 % and 87.4 % conversions for CH4 and CO2 continuously over 24 h of reaction time with 13.51 wt% of carbon deposition. The strong metal‐support interaction of Co and Co−Al spinel in Co‐15 stabilizes and prevents the sintering of Co particles, enhancing the efficiency for dry reforming reaction.

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Reforming and cracking of CH 4 over Al 2 O 3 supported Ni, Ni-Fe and Ni-Co catalysts

Cited by 77 publications

References 51 publications

Highly efficient Ni/CeO2-Al2O3 catalysts for CO2 upgrading via reverse water-gas shift: Effect of selected transition metal promoters

Highly efficient Ni/CeO2-Al2O3 catalysts for CO2 upgrading via reverse water-gas shift: Effect of selected transition metal promoters

Dry Reforming of Shale Gas and Carbon Dioxide with Ni‐Ce‐Al₂O₃ Catalyst: Syngas Production Enhanced over Ni‐CeO_x Formation

Development of Co Supported on Co−Al Spinel Catalysts from Exsolution of Amorphous Co−Al Oxides for Carbon Dioxide Reforming of Methane

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Reforming and cracking of CH 4 over Al 2 O 3 supported Ni, Ni-Fe and Ni-Co catalysts

Cited by 77 publications

References 51 publications

Highly efficient Ni/CeO2-Al2O3 catalysts for CO2 upgrading via reverse water-gas shift: Effect of selected transition metal promoters

Highly efficient Ni/CeO2-Al2O3 catalysts for CO2 upgrading via reverse water-gas shift: Effect of selected transition metal promoters

Dry Reforming of Shale Gas and Carbon Dioxide with Ni‐Ce‐Al2O3 Catalyst: Syngas Production Enhanced over Ni‐CeOx Formation

Development of Co Supported on Co−Al Spinel Catalysts from Exsolution of Amorphous Co−Al Oxides for Carbon Dioxide Reforming of Methane

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Dry Reforming of Shale Gas and Carbon Dioxide with Ni‐Ce‐Al₂O₃ Catalyst: Syngas Production Enhanced over Ni‐CeO_x Formation