Novel Nickel- and Magnesium-Modified Cenospheres as Catalysts for Dry Reforming of Methane at Moderate Temperatures

Samojeden, Bogdan; Kamienowska, Marta; Colorado, Armando Izquierdo; Gálvez, María Elena; Kolebuk, Ilona; Motak, Monika; Costa, Patrick Da

doi:10.3390/catal9121066

Cited by 9 publications

(3 citation statements)

References 40 publications

(57 reference statements)

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“…As shown in Figure 4A, all the Ni-based catalysts showed higher initial CDR activity, which is close to the equilibrium CH 4 conversion (83%), and the CH 4 conversion at 0.5 h was above 81%. This result is in agreement with the reference reports [47]. However, there were large differences in their stability.…”

Section: Catalytic Performancesupporting

confidence: 93%

Carbon Dioxide Reforming of Methane over Ni Supported SiO2: Influence of the Preparation Method on the Resulting Structural Properties and Catalytic Activity

et al. 2020

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Ni-C/SiO2 and Ni-G/SiO2 catalysts were prepared by a complexed-impregnation method using citric acid and glycine as complexing agents, respectively. Ni/SiO2 was also prepared by the conventional incipient impregnation method. All the catalysts were comparatively tested for carbon dioxide reforming of methane (CDR) at P = 1.0 atm, T = 750 °C, CO2/CH4 = 1.0, and GHSV = 60,000 mL·g−1·h−1. The results showed that Ni-C/SiO2 and Ni-G/SiO2 exhibited better CDR performance, especially regarding stability, than Ni/SiO2. The conversions of CH4 and CO2 were kept constant above 82% and 87% after 20 h of reaction over Ni-C/SiO2 and Ni-G/SiO2 while they were decreased from 81% and 88% to 56% and 59%, respectively, over the Ni/SiO2. The characterization results of the catalysts before and after the reaction showed that the particle size and the distribution of Ni, as well as the interactions between Ni and the support were significantly influenced by the preparation method. As a result, an excellent resistance to the coking deposition and the anti-sintering of Ni was obtained over the Ni-C/SiO2 and Ni-G/SiO2, leading to a highly active and stable CDR performance.

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Section: Catalytic Performancesupporting

confidence: 93%

Carbon Dioxide Reforming of Methane over Ni Supported SiO2: Influence of the Preparation Method on the Resulting Structural Properties and Catalytic Activity

et al. 2020

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“…Silica and alumina occurring in the ashes can be considered as very useful materials for the catalytic supports, exhibiting strong thermal resistance as a result of their high-temperature origin. Nickel- and magnesium-modified cenospheres were satisfactorily tested in, e.g., the dry reforming methane reaction . The fly ashes with an increased level of transition metals, like iron or titanium, could also be efficiently used as redox heterogeneous catalysts. , …”

Section: Discussionmentioning

confidence: 99%

“…Nickeland magnesium-modified cenospheres were satisfactorily tested in, e.g., the dry reforming methane reaction. 39 The fly ashes with an increased level of transition metals, like iron or titanium, could also be efficiently used as redox heterogeneous catalysts. 30,40 The proposed algorithm can be helpful in determining the optimal fly ash utilization pathways.…”

Section: Discussionmentioning

confidence: 99%

Key Parameters of Fly Ashes Generated from the Industrial Energy Sector Decisive for Their Pro-ecological Applications

et al. 2020

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Fly ashes belong to important byproducts, accompanying industrial energy production based on combustion technologies. Dependent upon the nature and characteristics of the used fuels as well as combustion technologies and their conditions, fly ashes may exhibit different physicochemical properties, limiting their potential applications as raw materials. A burned hard coal, lignite, biomass, or heavy fuel oil may generate fly ashes of various chemical, mineral, and phase characteristics. Both process conditions and humidity can, in turn, strongly influence final textural properties of such materials. Exhaust gas cleaning technologies also cannot be neglected as important factors potentially affecting textural and functional properties of the fly ashes. For example, denitrification processes, where NH3 is used as a reducer, can result in the so-called ammonia slip, when excessive, unreacted ammonia undergoes sorption on ash grains, forming the corresponding ammonia salts. Such undesired effects can be problematic for the consecutive use of fly ashes as raw materials or components. The current work was focused on an in-depth analysis of chemical, mineral, and phase compositions of fly ashes of various origin. Their structural, textural, and functional characterizations have been performed by means of X-ray fluorescence, X-ray diffraction, scanning electron microscopy–energy-dispersive X-ray spectroscopy, Brunauer–Emmett–Teller method, Raman and diffuse reflectance infrared Fourier transform spectroscopies. The concentration of NH3(aq) in aqueous effluents was determined by ultraviolet–visible spectrophotometry. On the basis of the obtained results, a hierarchical algorithm for selecting the most important parameters for industrial-scale pro-ecological applications was proposed. The ratio of Si/Al, the main constitutive elements of fly ashes, both content and speciation of iron and/or other transition metals, occurrence of alkali components and carbonaceous residuals, content of ammonia, mineral and phase compositions, grain diameters and morphology, and sorptive affinity of water to surfaces of ashes were selected as crucial parameters, remaining decisive for the successful exploitation of ashes as raw materials.

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Fly‐Ash Cenosphere as Non‐Porous Ag‐Nanoparticle Support for Epoxidation of Styrene

Tarasova,

Khanov,

Vorobiev

et al. 2024

ChemistrySelect

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The global strategy to reduce waste production implies development of recycling technologies and conversion of various waste into value‐added products. Fly ash is an industrial waste produced in a large amount. It comprised an aluminosilicate cenosphere, which seems perspective as a support for heterogeneous catalysts. Here we report the preparation and application of heterogeneous silver nanocatalysts deposited on cenosphere in the epoxidation reaction, a relevant process for preparation of valuable organic precursors and target chemicals. Reductive wet deposition method yields Ag nano‐dispersed coating of improved quality represented by Ag particles of about 2.7 nm on the surface of the microspheres size of 50–250 microns for catalytic synthesis of styrene‐oxide. The 0.1 mmol/g Ag/cenosphere provided best catalytic results with threefold excess of tret‐butyl hydroperoxide in acetonitrile at 80 °C. Comparison of fly ash cenosphere with other supports suggests that low porosity of microspherical support allows for an easier access of reagents to active sites of the catalyst and significantly increases the yield of epoxide and selectivity of the reaction.

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Novel Nickel- and Magnesium-Modified Cenospheres as Catalysts for Dry Reforming of Methane at Moderate Temperatures

Cited by 9 publications

References 40 publications

Carbon Dioxide Reforming of Methane over Ni Supported SiO2: Influence of the Preparation Method on the Resulting Structural Properties and Catalytic Activity

Carbon Dioxide Reforming of Methane over Ni Supported SiO2: Influence of the Preparation Method on the Resulting Structural Properties and Catalytic Activity

Key Parameters of Fly Ashes Generated from the Industrial Energy Sector Decisive for Their Pro-ecological Applications

Fly‐Ash Cenosphere as Non‐Porous Ag‐Nanoparticle Support for Epoxidation of Styrene

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