Preparation of supported Co catalysts from Co–Mg–Al layered double hydroxides for carbon dioxide reforming of methane

Li, Dalin; Lu, Miaomiao; Xu, Shuping; Chen, Chongqi; Zhan, Yingying; Jiang, Lilong

doi:10.1016/j.ijhydene.2016.10.114

Cited by 24 publications

(14 citation statements)

References 39 publications

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“…[21] Moreover,t he re-oxidationo fm etallic Co in Co/TiO 2 (rutile) during DRM was found to be the main cause for low activity and deactivation. [23] Besides the Co/Al 2 O 3 and Co/TiO 2 catalysts, other Co-based catalysts, including bimetallic ones, [11a, 14, 24] Co(Mg-Al-O) derived from the layered double hydroxides, [25] Co/SBA-15, [26] Co/CeO 2 , [27] Co/Nd 2 O 3 , [28] andC o/C, [29] have been developed for DRM. [23] Besides the Co/Al 2 O 3 and Co/TiO 2 catalysts, other Co-based catalysts, including bimetallic ones, [11a, 14, 24] Co(Mg-Al-O) derived from the layered double hydroxides, [25] Co/SBA-15, [26] Co/CeO 2 , [27] Co/Nd 2 O 3 , [28] andC o/C, [29] have been developed for DRM.…”

Section: Introductionmentioning

confidence: 99%

“…[22] On the otherh and, the preparation approaches to generating smaller metallic Co particles and inducing strong Co-support interaction would display high activity and stabilityo fc atalyst in DRM. [23] Besides the Co/Al 2 O 3 and Co/TiO 2 catalysts, other Co-based catalysts, including bimetallic ones, [11a, 14, 24] Co(Mg-Al-O) derived from the layered double hydroxides, [25] Co/SBA-15, [26] Co/CeO 2 , [27] Co/Nd 2 O 3 , [28] andC o/C, [29] have been developed for DRM. Generally,t he nature of support, the pre-treatment history (calcination and reduction), and the Co loading all showed profound effects on the catalytic performance of DRM.…”

Section: Introductionmentioning

confidence: 99%

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How do Core–Shell Structure Features Impact on the Activity/Stability of the Co‐based Catalyst in Dry Reforming of Methane?

Pang

Zhong

et al. 2018

ChemCatChem

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Dry reforming of methane has been systematically investigated over a series of x‐Co@SiO2‐y catalysts where x is the Co particle size ranging from 11.1 to 121.3 nm while y denotes the silica shell thickness ranging from 6.0 to 21.9 nm. Various techniques including TEM, XRD, H2‐TPR/‐TPD, XPS, BET, O2‐TPO, TG, and H2‐TPSR‐MS were employed to characterize physicochemical properties of catalysts. H2‐TPR and XPS results indicate that the core–shell interaction is dependent on the core size: the smaller the Co particle size is; the stronger the core–shell interaction. The investigations employing H2‐TRSR‐MS and XPS on the spent catalysts demonstrated that a fraction of metallic Co was re‐oxidized on a large‐core catalyst such as 121.3‐Co@SiO2‐72.2 during the reaction, and such oxidation leads to lower catalytic activity and stability. O2‐TPO results indicated that the catalyst with smaller core size caused significant coking. TG analysis together with TEM investigation on the used samples suggested that carbon deposition is notably core‐size‐dependent and responsible for deactivation of the small‐core catalyst. Among various core–shell structured catalysts, 27.8‐Co@SiO2‐14.3 showed superior activity and durability, owing to the well‐balanced property between coking and anti‐oxidation of Co cores.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

How do Core–Shell Structure Features Impact on the Activity/Stability of the Co‐based Catalyst in Dry Reforming of Methane?

Pang

Zhong

et al. 2018

ChemCatChem

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“…The activity per gram obtained shows quite improvement in comparison. (1,3,5, and 7 bar). It is evident from the profiles that the conversions grew with the rise of the reaction temperature.…”

Section: Catalytic Activitymentioning

confidence: 99%

“…The carbon dioxide, methane reforming universally known as dry reforming (DRM) is a convenient method for producing synthesis gases from two powerful greenhouse gases (CH 4 and CO 2 ) [1][2][3][4][5]. Nevertheless, synthesis gas, the product of CH 4 dry reforming, is a vital raw material for the production of liquid hydrocarbons [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pressure on Na0.5La0.5Ni0.3Al0.7O2.5 Perovskite Catalyst for Dry Reforming of CH4

et al. 2020

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In this paper, a comprehensive study was carried out on the application of perovskite catalyst in dry reforming of CH4. The perovskite catalyst was prepared using a sol–gel method. The prepared samples were characterized by N2 adsorption/desorption, TPR, XRD, CO2-TPD, TGA, TPO, Raman, and SEM techniques. In addition, the effect of operating pressure, namely, 1 bar, 3 bar, 5 bar, and 7 bar, temperature (500–800 °C) was evaluated. The characterization results indicated that catalysts operated at 1 bar, gas hourly space velocity of 84000 (mL/g/h) gave the best catalytic performance. CH4 and CO2 conversions of 77 and 80% were obtained at 1 bar and at 700 °C reaction temperature. The increase of reaction temperatures from 500 °C to 800 °C increased the reaction rate and hence the methane and carbon dioxide conversions were increased. A unity ratio of H2/CO was obtained at 1 bar for temperatures 600 °C and above. Similarly, the time on stream tests, obtained at a 700 °C reaction temperature, showed that the best ratio in terms of the closeness of unity and the stable profile could be attained when the pressure was set to 1 bar. The TGA analysis showed the drop of mass due to oxidation of carbon deposits, which started at 500 °C. The catalyst operated at 1 bar produced the least amount of carbon, equivalent to 35% weight loss, while the 3 and 5 bar operated catalysts generated carbon formation, equivalent to 65% weight loss. However, the 7 bar operated catalyst resulted the highest accumulation of carbon formation, equivalent to 83% weight reduction. Hence, the TGA profile indicated the relative carbon deposition on the catalyst, which was dependent of the operated pressure and hence confirmed the suitability operation pressure of 1 bar. The characterizations of the Raman, EDX, TGA, and TPO all presented the formation of carbon.

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“…Figures 1 (a2), (b2), and (c2) illustrate the typical TEM images of reduced Co-10, Co-15, and Co-20. The catalysts were depicted as uneven spherical particles with dark contrast, [42,43] Ni and NiÀ Co supported on alumina modified with CaO or MgO * Additional active sites were detected when support was modified with CaO, which is responsible for better catalytic activity and lower carbon deposition. * MgO interacted strongly with Ni and Co, which adversely affecting catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

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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Preparation of supported Co catalysts from Co–Mg–Al layered double hydroxides for carbon dioxide reforming of methane

Cited by 24 publications

References 39 publications

How do Core–Shell Structure Features Impact on the Activity/Stability of the Co‐based Catalyst in Dry Reforming of Methane?

How do Core–Shell Structure Features Impact on the Activity/Stability of the Co‐based Catalyst in Dry Reforming of Methane?

Effect of Pressure on Na0.5La0.5Ni0.3Al0.7O2.5 Perovskite Catalyst for Dry Reforming of CH4

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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