Investigation on cobalt aluminate as an oxygen carrier catalyst for dry reforming of methane

Wong, Yee Jie; Koh, Mei Kee; Khavarian, Mehrnoush; Mohamed, Abdul Rahman

doi:10.1016/j.ijhydene.2017.09.151

Cited by 29 publications

(16 citation statements)

References 37 publications

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“…[50,80] In our previous study we found that CO 2 can react with the catalysts (CO 2 + Co/Al 2 O 3 !CO + CoAl 2 O 4 ). [80] In case of Co-10, the amount of Co loaded is the lowest among all the other catalysts and resulted in the formation of smaller Co particles. These Co particles (� 10 nm) can easily dissolve into the lattice of the support as explained by Hansen et al, [65] forming CoÀ Al spinel, reducing the amount of active Co available for dry reforming.…”

Section: Resultsmentioning

confidence: 98%

“…The reduction in catalytic activity was deduced to be resulted from the oxidation of small Co particles by CO 2 . In our previous study we found that CO 2 can react with the catalysts (CO 2 +Co/Al 2 O 3 →CO+CoAl 2 O 4 ) . In case of Co‐10, the amount of Co loaded is the lowest among all the other catalysts and resulted in the formation of smaller Co particles.…”

Section: Resultsmentioning

confidence: 99%

“…Reduced Co‐10 and Co‐15 showed negligible mass loss, which can be translated into negligible carbon deposits. Meanwhile, reduced Co‐20, Co‐30, and Co‐15(24 h) experienced major weight loss between 400 and 575 °C, which is attributed to the oxidation of structured carbon (mainly carbon nanotubes and nanofilaments) . As measured, average rate of carbon deposition of the catalysts (6 h reaction time) increased from 0.96 to 72.21 mg g cat −1 h −1 with increasing Co loading.…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, reduced Co-20, Co-30, and Co-15(24 h) experienced major weight loss between 400 and 575°C, which is attributed to the oxidation of structured carbon (mainly carbon nanotubes and nanofilaments). [80,90] As measured, average rate of carbon deposition of the catalysts (6 h reaction time) increased from 0.96 to 72.21 mg g cat À 1 h À 1 with increasing Co loading. The results are correlated with the size of Co particles as larger Co particles produce higher carbon deposits.…”

Section: Catalysts Average Conversion [%]mentioning

confidence: 87%

“…Catalyst preparation: All the catalysts were prepared using Co (NO 3 ) 2 ·6H 2 O (Merck, Germany) and Al(NO 3 ) 3 · 9H 2 O (Merck, Germany) as the metal precursors and citric acid (Fisher, USA) as the chelating agent. [80] The Co-to-Al mol ratio was fixed at 30 : 70, 20 : 80, 15 : 85, and 10 : 90. The molar ratio of total metal ions (Co and Al ions) to citric acid was 1 : 2.…”

Section: Methodsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Catalysts Average Conversion [%]mentioning

confidence: 87%

Section: Methodsmentioning

confidence: 99%

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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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Chemical‐Looping Conversion of Methane: A Review

et al. 2019

Energy Tech

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Chemical‐looping technology provides a versatile platform to convert methane in a clean and efficient manner, achieving CO2 capture and generation of syngas/pure H2 without additional separation processes (e.g., separation of CO2 from N2‐diluted exhaust gases, separation of O2 from air, and separation of H2 from syngas) using a two‐step redox concept through recyclable oxygen storage materials (named oxygen carriers) as intermediates. The design and elaboration of appropriate oxygen carriers is a key issue to effectively optimize the products and energy distribution. Various oxygen storage materials (e.g., Fe‐based, Ni‐based, Cu‐based, Ce‐based, perovskite‐type oxides and their mixed oxides) have been widely investigated with the corresponding chemical‐looping process. This work aims to comprehensively describe the advances of chemical‐looping conversion of methane, including chemical‐looping combustion, partial oxidation, steam reforming, and dry reforming technologies. Specifically, this Review focuses on the development of oxygen carriers, including the effects of composition, micro and macro structures, morphology, and supports on the performance for selective conversion of methane. The advances in understanding the reaction mechanisms between methane and different oxygen carriers in chemical‐looping processes are also discussed. Finally, future research directions for developing high‐performance oxygen carriers are proposed.

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Effective direct chemical looping coal combustion using bimetallic Ti‐supported Fe₂O₃‐MnO₂ oxygen carriers

Ksepko

Lysowski

2023

Greenhouse Gases

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In this paper five bimetallic Fe2O3‐MnO2 oxygen carriers supported on TiO2 were evaluated for direct hard coal combustion via chemical looping path. The oxygen carriers were obtained via mechanical mixing and high‐temperature calcination. The samples contained varying amounts of Fe2O3 (20–50 wt.%) and MnO2 (65–30 wt.%) but an identical amount of inert material (15 wt.%). Both the impact of the oxygen carrier's composition and the process temperature on their reactivity with the selected hard coal were evaluated. The amount of manganese in the oxygen carriers correlated positively with their reactivity toward the fuel. It was concluded that after eight reaction cycles the oxygen carriers remained resilient for side reactions with the ash residue. Thus, the physicochemical stability of the presented oxygen carriers was proved. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Investigation on cobalt aluminate as an oxygen carrier catalyst for dry reforming of methane

Cited by 29 publications

References 37 publications

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

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

Chemical‐Looping Conversion of Methane: A Review

Effective direct chemical looping coal combustion using bimetallic Ti‐supported Fe₂O₃‐MnO₂ oxygen carriers

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Investigation on cobalt aluminate as an oxygen carrier catalyst for dry reforming of methane

Cited by 29 publications

References 37 publications

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

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

Chemical‐Looping Conversion of Methane: A Review

Effective direct chemical looping coal combustion using bimetallic Ti‐supported Fe2O3‐MnO2 oxygen carriers

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Product

Resources

About

Effective direct chemical looping coal combustion using bimetallic Ti‐supported Fe₂O₃‐MnO₂ oxygen carriers