On the dry and mixed reforming of methane over Ni/Al2O3 – Influence of reaction variables on syngas production

Karemore, Ashvin L.; Vaidya, Prakash D.; Sinha, Renu; Chugh, Parivesh

doi:10.1016/j.ijhydene.2016.09.038

Cited by 26 publications

(9 citation statements)

References 36 publications

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“…Koo et al 37 investigated the combination of DRM and SRM and found that an H 2 /CO ratio of 2 could be achieved using a feed ratio of CH 4 /CO 2 /H 2 O = 1:0.4:0.8. In the study by Karemore et al, 38 the influence of reaction variables over dry and mixed reforming of methane for syngas production using the Ni/Al 2 O 3 catalyst in a fixed bed reactor was studied. Their results showed that reactant conversion and product yield increased with the increase in space time.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Dry Reforming of Biogas for Syngas Production over Ni-Based Catalysts

Chein

Yang

2019

ACS Omega

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Syngas production from dry reforming of biogas (DRB) is studied experimentally in this work. Ni/Al2O3, Pt/Al2O3, and Pt-Ni/Al2O3 are used as catalysts to examine the effect of CO2 content in biogas and H2O addition on DRB performance for reaction temperatures in the 600–800 °C range. It is found that the bimetallic Pt–Ni catalyst exhibits the best activity and thermal stability among the three types of catalysts studied due to better carbon deposition resistance. Because CO2 functions as the oxidant in combustion, CH4 conversion is enhanced when the biogas contains more CO2. One hundred percent CO2 conversion can be reached for biogas containing a less amount of CO2 at high temperatures. With H2O addition in DRB, the steam reforming of methane (SRM) reaction is the dominant reaction, resulting in higher H2 and CO yields with biogas containing lesser amounts of CO2. However, lower CH4 conversion and negative CO2 conversion do result. With higher CO2 content in the biogas, higher CH4 and CO2 conversions can be obtained. Lower yields of H2 and CO are obtained due to less SRM dominance. With H2O addition in biogas, the H2/CO ratio with a value greater than 1 can be obtained from DRB. It is also found that the H2/CO ratio with a value of 2.1 can be obtained for reactant composition with a molar ratio of CH4/CO2/H2O = 1:0.25:1 and reaction temperature of 800 °C.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Dry Reforming of Biogas for Syngas Production over Ni-Based Catalysts

Chein

Yang

2019

ACS Omega

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“…Therefore, the N 2 O selectivity does not always follow the NO conversion ratio although it is closely related to the reaction temperatures. From the results so far, it can be concluded that: (1) The NO conversion with varied Co loadings follows the trend: 2.3−31.3 Co/nm 2 (monolayer and over-monolayer) > 1.1 Co/nm 2 (sub-monolayer) ≫ 0.2 Co/ nm 2 (very low Co concentration) ≫ bulk Co 3 O 4 > bulk CeO 2 ;…”

Section: Resultsmentioning

confidence: 96%

“…Anthropogenic greenhouse gas emissions and pollutants in the atmosphere are causing growing global warming concerns . Nitrogen oxides (NO x ) are some of the main contributorsin addition to hydrocarbons (HCs), carbon monoxide (CO), sulfur oxides (SO x ), and particulate mattersto air pollution. − Many investigations have been performed for catalytic NO x (mainly NO) reduction, resulting in the development of techniques, such as NO reduction by hydrocarbon or CO and NH 3 -selective catalytic reduction. − Among the discovered methods, NO reduction by CO (2NO + 2CO → N 2 + CO 2 ) has received much attention because a large amount of carbon monoxide (CO) also exists in automobile exhausts.…”

Section: Introductionmentioning

confidence: 99%

Effects of Molecular and Electronic Structures in CoO_x/CeO₂ Catalysts on NO Reduction by CO

Zhang

Huang

et al. 2019

J. Phys. Chem. C

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Ceria-supported transition metal oxide (such as CoO x ) catalysts are promising, more cost-effective candidates to replace platinum group metal catalysts in the NO reduction process. A series of CoO x (0.2−31.3 Co/nm 2 ) catalysts supported on CeO 2 were prepared by the incipient wetness impregnation method and were tested for NO reduction by CO reaction in this work. Various characterization techniques, including Brunauer−Emmett−Teller, Raman spectroscopy, powder X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) were used to investigate the molecular and electronic structures of CoO x /CeO 2 catalysts. It was observed that there are structural changes with varied Co loadings, such as (1) sub-monolayer: <2.3 Co/nm 2 , (2) monolayer: 2.3−2.7 Co/nm 2 , and (3) over-monolayer: >2.7 Co/ nm 2 . The highest molar rate was observed at the 2.7 Co/nm 2 sample. In the case of over-monolayer samples, such as 7.1 Co/ nm 2 , the oxidation state of Co affected the catalytic activity. Using in situ XAS, an oxidation state change from Co 3+ to Co 2+ between 200 and 300 °C was identified. Catalyst deactivation was also affected by the change of Co oxidation states from the fresh sample (Co 3+ ) to the used sample (Co 3+ /Co 2+ ). N 2 O formation and decomposition were affected by the reaction temperature in a two-step procedure, where NO converts into N 2 : (1) NO → N 2 O and (2) N 2 O → N 2 . N 2 selectivity monotonically increased with an increasing reaction temperature between 200 and 400 °C. The results provided several structure−property relationships and a possible reaction mechanism for NO reduction by CO reaction over CoO x /CeO 2 catalysts.

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“…In the literature, the catalytic systems initially studied used as active phase noble metals such as Rh, Ru, Pd and Pt [27][28][29][30] which, for MDR, have a high stability and activity and a good resistance to coke. However, these metals are not industrially convenient because they are very expensive [31]. A more economical alternative to noble metals is the use of transition metals such as Ni and Co.…”

Section: Of 16mentioning

confidence: 99%

Development of La Doped Ni/CeO2 for CH4/CO2 Reforming

Menegazzo

Pizzolitto

Ghedini

et al. 2018

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Methane dry reforming (MDR) allows the transformation of carbon dioxide and methane, the two main greenhouse gases, into syngas. Given the high endothermicity of the process, it is necessary to produce a catalytic system that is very active, selective and resistant to coking deactivation; this work focuses on the development of a heterogeneous catalyst based on nickel supported on cerium oxide. Several strategies of synthesis of the catalysts were studied with particular attention to the lanthanum addition methodology. Both supports and catalysts, fresh and used, were deeply characterized by different techniques (N2 physisorption, TPR, XRD, SEM). The effect of temperature on activity and selectivity of the different catalysts was also studied. A positive effect of lanthanum addition is strongly related to the synthetic methodology. Incipient wetness impregnation of lanthanum precursor on an already calcined ceria has led to the best catalytic activity. This behaviour is due to a more effective interaction between nickel and the support, which results in a higher dispersion of the active phase. The structural modifications have led to an improvement of the redox pump of the ceria, reducing the formation of coke during the reaction and improving the stability on time on stream.

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On the dry and mixed reforming of methane over Ni/Al2O3 – Influence of reaction variables on syngas production

Cited by 26 publications

References 36 publications

Experimental Study on Dry Reforming of Biogas for Syngas Production over Ni-Based Catalysts

Experimental Study on Dry Reforming of Biogas for Syngas Production over Ni-Based Catalysts

Effects of Molecular and Electronic Structures in CoO_x/CeO₂ Catalysts on NO Reduction by CO

Development of La Doped Ni/CeO2 for CH4/CO2 Reforming

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On the dry and mixed reforming of methane over Ni/Al2O3 – Influence of reaction variables on syngas production

Cited by 26 publications

References 36 publications

Experimental Study on Dry Reforming of Biogas for Syngas Production over Ni-Based Catalysts

Experimental Study on Dry Reforming of Biogas for Syngas Production over Ni-Based Catalysts

Effects of Molecular and Electronic Structures in CoOx/CeO2 Catalysts on NO Reduction by CO

Development of La Doped Ni/CeO2 for CH4/CO2 Reforming

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Effects of Molecular and Electronic Structures in CoO_x/CeO₂ Catalysts on NO Reduction by CO