Sono-synthesis and characterization of bimetallic Ni–Co/Al2O3–MgO nanocatalyst: Effects of metal content on catalytic properties and activity for hydrogen production via CO2 reforming of CH4

Abdollahifar, Mozaffar; Haghighi, Mohammad; Babaluo, Ali Akbar; Talkhoncheh, Saeed Khajeh

doi:10.1016/j.ultsonch.2015.12.010

Cited by 72 publications

(35 citation statements)

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“…A study on dry reforming of methane over a Ni/ -Al2O3 catalyst in a fixed bed continuous flow quartz reactor and direct current corona discharge found an increase selectivity for CO and decreased carbon formation on the catalyst surface [13]. Dry methane reforming is not only affected by temperature, but also the CH4/CO2 ratio, mass to flow ratio, catalyst selection and reaction mixture [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis-catalytic dry (CO 2 ) reforming of waste plastics for syngas production: Influence of process parameters

Saad

Williams

2017

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Abstract:Catalytic dry (CO2) reforming of waste plastics was carried out in a two stage, pyrolysis-catalytic reforming fixed bed reactor to optimise the production of syngas (H2 + CO). The effects of changing the process parameters of, catalyst preparation conditions, catalyst temperature, CO2 input rate and catalyst:plastic ratio were investigated. The plastics used was a mixture of plastics simulating that found in municipal solid waste and the catalyst used was Ni-Co-Al2O3. The results showed that changing each of the process conditions investigated, all significantly influenced syngas production. An increase of 17 % of syngas production was achieved from the experiment with the catalyst prepared by rising-pH technique compared to preparation via the impregnation method. The optimum syngas production of 148.6 mmolsyngas g -1 swp was attained at the catalytic dry reforming temperature of 800 °C and catalyst:plastic ratio of 0.5. The increase of CO2 input rate promoted a higher yield of syngas.

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Section: Introductionmentioning

confidence: 99%

Pyrolysis-catalytic dry (CO 2 ) reforming of waste plastics for syngas production: Influence of process parameters

Saad

Williams

2017

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“…The peaks in the range of 500-900 cm -1 are ascribed to the vibrations of metal oxide bonds [40]. The absorption band appearing in about 1645 cm -1 is assigned to physically absorbed water during maintenance of the catalysts after calcination [41][42][43]. The strong broad peak around 3450 cm -1 is related to hydroxyl bonds [44][45][46].…”

Section: Bet Analysismentioning

confidence: 99%

Sol–gel preparation of NiO/ZrO2(x)–MgO(100−x) nanocatalyst used in CO2/O2 oxidative dehydrogenation of ethane to ethylene: influence of Mg/Zr ratio on catalytic performance

Nezhad

Haghighi

Jodeiri

et al. 2016

J Sol-Gel Sci Technol

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A series of NiO/MgO-ZrO 2 mixed oxide catalysts were prepared using the sol-gel method in which the content of MgO and ZrO 2 was varied and the NiO amount was maintained around 5 wt%. The synthesized samples were characterized by XRD, FESEM, PSD, TEM, EDX dot-mapping, FTIR and the BET techniques and tested for the dehydrogenation of ethane in the presence of CO 2 with limited amount of O 2 . Irrespective of the various Mg/Zr ratios, the uniform dispersion of NiO as a common feature of all synthesized samples was evident from the XRD and EDX results. As indicated by XRD and FESEM analyses, a decrease in the size of nanocrystallites and particles and also an increase in the specific surface area were found when MgO phase is present in the sample. The catalytic evaluations revealed that the existence of basic MgO leads to more efficient performance of zirconia especially at higher temperatures. Hence, using both ZrO 2 and MgO increased the ethane conversion and the ethylene yield. This could be attributed to the effect of high reducibility and low surface acidity. It was observed that among the synthesized catalysts, NiO/ZrO 2(75) -MgO (25) was the most active catalyst with an ethane conversion of 66.35 %. However, NiO/ZrO 2(25) -MgO (75) exhibited the best catalytic performance in the oxidative dehydrogenation of ethane with an ethylene yield of 56.9 % at 650°C. The smaller particle and crystallite size, the narrower particle size distribution, uniform dispersion of the active species and higher surface area with efficient base-acid characteristics seem to be responsible for the superior performance of NiO/ZrO 2(25) -MgO (75) catalyst.Graphical Abstract CO 2 /O 2 oxidative dehydrogenation of ethane was investigated over a series of sol-gel synthesized Ni/ZrO 2 -MgO catalysts differing in Mg/Zr ratio. The presence of MgO alongside zirconia contributed to obtain better textural properties and satisfying ethylene yield. The variation of Mg/Zr ratio indicates that there is optimum MgO content in Ni/ZrO 2(25) -MgO (75) for the best catalytic activity. It is found that Ni/ZrO 2(25) -MgO (75) nanocatalyst, with weight ratio of MgO/ZrO 2 :3/1, effectively dehydrogenated ethane to ethylene in the presence of CO 2 /O 2 at 650°C, giving 56.9 % ethylene yield. This is due to higher surface area, smaller particles and narrow distribution of particle size.

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“…Hydrogen production has been offered by various techniques such as gas reforming or oil and coal gasification. As a result of the lower cost and higher availability of natural gas (mainly methane), gas reforming processes have attracted a lot of attentions . Methane converts to syngas during reaction 1 which is the industrial steam reforming of methane (SRM).…”

Section: Introductionmentioning

confidence: 99%

“…As a result of the lower cost and higher availability of natural gas (mainly methane), gas reforming processes have attracted a lot of attentions. 1 Methane converts to syngas during reaction 1 which is the industrial steam reforming of methane (SRM). Moreover, syngas production by dry reforming of methane (DRM) and partial oxidation of methane (POM) was studied in different research reports.…”

Section: Introductionmentioning

confidence: 99%

Influence of tungsten loading on CO₂ /O₂ reforming of methane over Co-W-promoted NiO-Al₂ O₃ nanocatalyst designed by sol-gel-plasma

Sajjadi

Haghighi

2018

Int J Energy Res

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Summary Co‐W–promoted NiAl2O4 nanocatalyst with various amount of tungsten (0, 1, 3, and 7 wt.%) was fabricated via hybrid sol‐gel‐plasma method. The nanocatalysts were evaluated by XRD, FESEM, EDX, BET, and FTIR analyses. The samples were utilized in CO2/O2 reforming of methane to syngas. EDX results proved the existence of all the applied elements in synthesis. FESEM and BET results illustrated that tungsten addition led to lower surface area, larger particle size, and roughly worse particles scattering. Therefore, Co‐NiAl2O4 (NCW0A) presented higher yield; however, yields were reduced for the other samples due to the covering impact of tungsten. As a result of time on streams performance (2880 minutes and at 750°C), the 7 wt.% tungsten promoted sample exhibited stable but lower yield (YH2 = 64%). Moreover, NCW1A exhibited more stable and higher yield than NCW0A. Optimum operating parameters were obtained as GHSV = 24 l/gcat.h, CH4/CO2 = 1, and CH4/CO2/O2 = 1/1/0.08. TG‐DTG, EDX, and FESEM analyses were applied for the used samples. TG‐DTG graphs demonstrated that by rising of tungsten loading, lighter and lower amount of coke was formed. Some agglomerations were observed in the EDX images of NCW0A and NCW1A while lower agglomeration was found for the tungsten‐rich sample. Carbon fiber formation was detected in the FESEM images of the used NCW0A while for the others, amount of the deposited coke and carbon fibers decreased.

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Sono-synthesis and characterization of bimetallic Ni–Co/Al2O3–MgO nanocatalyst: Effects of metal content on catalytic properties and activity for hydrogen production via CO2 reforming of CH4

Cited by 72 publications

References 37 publications

Pyrolysis-catalytic dry (CO 2 ) reforming of waste plastics for syngas production: Influence of process parameters

Pyrolysis-catalytic dry (CO 2 ) reforming of waste plastics for syngas production: Influence of process parameters

Sol–gel preparation of NiO/ZrO2(x)–MgO(100−x) nanocatalyst used in CO2/O2 oxidative dehydrogenation of ethane to ethylene: influence of Mg/Zr ratio on catalytic performance

Influence of tungsten loading on CO₂ /O₂ reforming of methane over Co-W-promoted NiO-Al₂ O₃ nanocatalyst designed by sol-gel-plasma

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Sono-synthesis and characterization of bimetallic Ni–Co/Al2O3–MgO nanocatalyst: Effects of metal content on catalytic properties and activity for hydrogen production via CO2 reforming of CH4

Cited by 72 publications

References 37 publications

Pyrolysis-catalytic dry (CO 2 ) reforming of waste plastics for syngas production: Influence of process parameters

Pyrolysis-catalytic dry (CO 2 ) reforming of waste plastics for syngas production: Influence of process parameters

Sol–gel preparation of NiO/ZrO2(x)–MgO(100−x) nanocatalyst used in CO2/O2 oxidative dehydrogenation of ethane to ethylene: influence of Mg/Zr ratio on catalytic performance

Influence of tungsten loading on CO2 /O2 reforming of methane over Co-W-promoted NiO-Al2 O3 nanocatalyst designed by sol-gel-plasma

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Influence of tungsten loading on CO₂ /O₂ reforming of methane over Co-W-promoted NiO-Al₂ O₃ nanocatalyst designed by sol-gel-plasma