Modifying alumina with CaO or MgO in supported Ni and Ni–Co catalysts and its effect on dry reforming of CH4

Sengupta, Samik; Deo, Goutam

doi:10.1016/j.jcou.2015.04.003

Cited by 90 publications

(48 citation statements)

References 63 publications

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“…Secondly, various types of promoters were employed to modify Ni/Al 2 O 3 catalysts, including alkali, alkaline earth, transition metal, and rare earth metal oxides. The basic oxides of Na, K, Mg, and Ca were explored to decrease the acidity of Ni/Al 2 O 3 . The surface of nickel catalyst incorporating basic metal oxide is favored by CO 2 adsorption, leading to the increase in CO 2 adsorption that can enhance its reaction with carbon and thus inhibits carbon deposition.…”

Section: Dry Reforming Of Methanementioning

confidence: 99%

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Advances in catalytic conversion of methane and carbon dioxide to highly valuable products

Cai

2019

Energy Science & Engineering

117

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Two typical processes have been developed for the conversion of methane and carbon dioxide to higher valuable products: dry reforming of methane (DRM) and CO2‐oxidative coupling of methane (CO2‐OCM). Numerous articles reviewed progresses in either DRM or CO2‐OCM, but no one covers both processes. In this review article, we systematically evaluated progresses in both DRM and CO2‐OCM processes for conversion of methane and CO2 to highly valuable products. Critical issues, which are carbon deposition and high energy cost for DRM and the contradiction between large activity and high selectivity for CO2‐OCM, were emphasized. Strategies to develop effective catalysts were evaluated, including the enhancement of metal‐support interactions, the introduction of promotors, the formation of solid solutions, and the construction of core‐shell structures. Plasma and photocatalysis were discussed as new promising technologies for DRM and CO2‐OCM.

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Section: Dry Reforming Of Methanementioning

confidence: 99%

“…The surface of nickel catalyst incorporating basic metal oxide is favored by CO 2 adsorption, leading to the increase in CO 2 adsorption that can enhance its reaction with carbon and thus inhibits carbon deposition. The addition of a second metal, such as Co, Cu, and Sn, can form less C‐sensitive alloys . Choi et al.…”

Section: Dry Reforming Of Methanementioning

confidence: 99%

Advances in catalytic conversion of methane and carbon dioxide to highly valuable products

Cai

2019

Energy Science & Engineering

117

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“…These analyses were based on CO 2 -pulse titration at 298 K, and their results expressed as µmol/g and µmol/m 2 of CO 2 uptake Compared with other types of solids, such as MgO [37], CaO [38], or Mg-Al mixed oxides [39], which have basicities as high as 180 µmol/g, the basicity of the studied HAps is considerably low, indicating that these solids have a moderate surface basicity, and that they mainly have surface sites where physisorption mechanisms occur through formation of surface carbonates [36]. The present analysis results are correlated with those of B.E.T areas, crystal size and crystallinity, all leading to the conclusion that basicity increases with increasing area and decreasing crystal size.…”

Section: Oxidementioning

confidence: 99%

High temperature CO2 capture of hydroxyapatite extracted from tilapia scales

2017

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Hydroxyapatite (HAp) was obtained from tilapia scales by two extraction methods: direct calcination and acid-base treatment. The physicochemical characteristics of the obtained HAps were evaluated by thermogravimetric analysis, X-ray fluorescence, X-ray diffraction, scanning electron microscopy, surface area, infrared spectroscopy, and basicity measurement at 298 K by CO 2 -pulse titration. Furthermore, the CO 2 capture capacity of the solids at high temperature was also determined. Both methods showed the presence of a HAp phase although significant differences in the properties of the solids were found. The HAp obtained by direct calcination, exhibited a lower crystallinity and a greater surface area and basicity than the HAp obtained by the acid-base treatment. These features were correlated with the solid's CO 2 capture capacity. In this work, CO 2 capture capacity values for HAp yielded by calcination ranged from 2.5 to 3.2 mg CO 2 /g captured at 973 K, and for the acid-base treatment-derived HAp, CO 2 capture capacity values between 1.2 to 2.5 mg CO 2 /g were recorded. These results reveal the potential of HAps extracted from tilapia scales as solids with high CO 2 capture capacity, thermal stability, and capture/release cycles reversibility.Keywords: fish scales; tilapia; hydroxyapatite; calcium; CO 2 capture IntroductionMillions of tons of fish scales are discarded and wasted around the world. In Colombia, fish scales are considered worthless, unusable, and are often eliminated as waste. Consequently, the local fish industry generates large amounts of fish waste per year, of which tilapia scales have a considerable share. Ideas have been proposed on how to create value for fish scales and how to use this resource [1 -4]. The surface of fish scales is constituted by numerous high-value organic and inorganic components, such as hydroxyapatite

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“…* MgO interacted strongly with Ni and Co, which adversely affecting catalytic activity. [44] 2 %Co/Al 2 O 3 * Catalyst prepared by controlled adsorption showed higher CH 4 and CO 2 conversion, which is attributed to the higher dispersion of Co. * Catalyst prepared by controlled adsorption were found to produce higher amounts of non-deactivating carbon deposits while the catalyst prepared by dry impregnation formed small amounts of deactivating carbon deposits that drastically hindered catalyst activity and led to faster deactivation. [24] NiÀ Co/Al 2 O 3 -MgO-ZrO 2 * Among the catalysts loaded with 5 %, 15 %, and 25 % of MgO, catalyst with 25 % of MgO exhibited highest surface area, and higher 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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Modifying alumina with CaO or MgO in supported Ni and Ni–Co catalysts and its effect on dry reforming of CH4

Cited by 90 publications

References 63 publications

Advances in catalytic conversion of methane and carbon dioxide to highly valuable products

Advances in catalytic conversion of methane and carbon dioxide to highly valuable products

High temperature CO2 capture of hydroxyapatite extracted from tilapia scales

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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