The impact of dopants on the activity and selectivity of a Ni-based methanation catalyst

Kramer, Michael D.; Stöwe, Klaus; Duisberg, M.; Müller, Frank; Reiser, M.; Sticher, S.; Maier, Wilhelm F.

doi:10.1016/j.apcata.2009.08.027

Cited by 56 publications

(21 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In previous studies, the peaks corresponding to the reduction of NiO to Ni were observed at 300-550 C. 23,24 Two continuous peaks were observed, that is, at 220-380 C and 400-580 C corresponding to the reduction of Co 3 O 4 to CoO and CoO to metallic Co, respectively. The peak intensity of 15NiA0CoACe 0.25 Zr 0.75 O 2 at low temperatures was very low because of the reduction of NiO on catalyst surface.…”

Section: Tpr Analysismentioning

confidence: 93%

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material Ce_xZr_1−xO₂ Supported NiCo Bimetallic Nanocatalysts

Zhu

Razzaq

et al. 2013

AIChE Journal

View full text Add to dashboard Cite

A series of active oxygen material Ce x Zr 12x O 2 -supported NiACo bimetallic nanosized catalysts were prepared by coprecipitation method, which is simple and fit for industrial use with lower cost than other methods. The effect of CeO 2 / ZrO 2 mole ratio, Co metal addition, and PEG-6000 addition were investigated. The catalysts were characterized through X-ray diffraction, H 2 thermal-programmed reduction, N 2 adsorption, Raman spectroscopy, CO pulse chemisorption, X-ray photoelectron spectroscopy, oxygen storage capacity, and transmission electron microscopy-energy dispersive X-ray analysis. Modifications of the structural and redox properties of these materials were evaluated in relation to their catalytic performances. Particularly, the relationship between the active oxygen sites of the catalysts and their catalytic performances was investigated. The interaction between active metals (Ni and Co) and Ce x Zr 12x O 2 support was found to be very important for catalytic performance. The active oxygen site of Ce x Zr 12x O 2 can considerably improve catalytic performance. Appropriate Co metal addition also remarkably enhanced the catalytic stability and activity. Moreover, PEG-6000 addition can improve the Brunauer-Emmett-Teller surface area and active metal dispersion of catalysts to improve their performances. The nanosized catalyst 15 wt % Ni-5 wt % Co/Ce 0.25 Zr 0.75 O 2 prepared by adding 5 wt % PEG-6000 achieved almost 85% CO 2 conversion and 98% selectivity to methane at 280 C when the gas hourly space velocity was 10,000 h 21 .

show abstract

Section: Tpr Analysismentioning

confidence: 93%

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material Ce_xZr_1−xO₂ Supported NiCo Bimetallic Nanocatalysts

Zhu

Razzaq

et al. 2013

AIChE Journal

View full text Add to dashboard Cite

show abstract

“…Previous studies have proved that nickel had high activity in methanation. 57,58 As methanation is favored under studied condition, the amount of reduced Ni is expected to influence methane selectivity. Therefore, decreasing amount of reducible Ni on Mg addition could cause a decrease in selectivity of CH 4 .…”

Section: Nickel Catalystsmentioning

confidence: 99%

Enhanced oxygen mobility and reactivity for ethanol steam reforming

Zhang

et al. 2011

AIChE Journal

View full text Add to dashboard Cite

This article describes a strategy for increasing oxygen storage capacity (OSC) of ethanol steam reforming (ESR) catalysts. Sintering and carbon deposition are major defects of nickel-based catalysts for ESR; tuning oxygen mobility (OM) of CeO 2 -based supports can overcome these drawbacks and promote H 2 production. We have successfully increased OSC and OM by adding Mg into the lattice of Ni/CeO 2 to promote H 2 production in ESR. The insertion of Mg into the CeO 2 lattice efficiently promotes the reduction of Ce 4þ according to X-ray powder diffraction (XRD) and temperature-programmed reduction (TPR) analysis. Mg-modified Ni/CeO 2 catalysts have larger OSC and smaller nickel crystallite size compared with bare Ni/CeO 2 . The optimal Mg addition is 7 mol % (Ni/7MgCe) with the best OM. We also present evidence indicating that Mg addition significantly promotes ethanol conversion and H 2 production in ESR, and that Ni/7MgCe yields the best performance due to the high OM of the support. These Mg-modified catalysts also produce less carbon deposition compared with Ni/ CeO 2 , and the amount of deposited carbon decreases with increasing Mg addition. Ni/ 7MgCe has the best resistance to carbon deposition owing to the excellent OM.

show abstract

“…With the addition of Zr, the slight shifts to higher angles of four strong CeO2 diffraction peaks around 2θ = 28.6°, 33.1°, 47.5° and 56.4° and no reflections of ZrO2 phase were observed in Ce0.9Zr0.1O2 sample. The comparison of the XRD patterns for CeO2 and Ce0.9Zr0.1O2 revealed that Ce-Zr solid solution had been formed in the Ce0.9Zr0.1O2 support [27,28]. Compared with CeO2, NiO phase (2θ = 37.2°, 43.3° and 62.9°, corresponding to the (111), (200) and (220)) was observed and the diffraction peaks of CeO2 had no shift of 40Ni-CeO2 sample, implying that nickel was at least partially present as NiO species outside the fluorite structure.…”

Section: Introductionmentioning

confidence: 99%

“…With the addition of Zr, the slight shifts to higher angles of four strong CeO 2 (200) and (220)) was observed and the diffraction peaks of CeO 2 had no shift of 40Ni-CeO 2 sample, implying that nickel was at least partially present as NiO species outside the fluorite structure. With the increasing of Zr, CeO 2 diffraction peaks shifted to higher angles of 40Ni-Ce 1−x Zr x O 2 (x = 0.05, 0.1, 0.2, 0.3, 1) samples, attributing to Zr incorporating into the lattice of ceria to form a homogeneous Ce-Zr solid solution [27,28]. For low content of Zr, it was difficult to unequivocally identify formation of a solid solution, as a consequence of the expected slightly shifts to higher angles of CeO 2 diffraction peaks.…”

Section: Introductionmentioning

confidence: 99%

Methanation of Carbon Dioxide over Ni–Ce–Zr Oxides Prepared by One-Pot Hydrolysis of Metal Nitrates with Ammonium Carbonate

et al. 2017

View full text Add to dashboard Cite

Ni-Ce-Zr mixed oxides were prepared through one-pot hydrolysis of mixed metal nitrates with ammonium carbonate for CO 2 methanation. The effects of Ce/Zr molar ratio and Ni content on catalysts' physical and chemical properties, reduction degree of Ni 2+ , and catalytic properties were systematically investigated. The results showed that Zr could lower metallic Ni particle sizes and alter interaction between Ni and supports, resulting in enhancements in the catalytic activity for CO 2 methanation. The Ni-Ce-Zr catalyst containing 40 wt % Ni and Ce/Zr molar ratio of 9:1 exhibited the optimal catalytic properties, with 96.2% CO 2 conversion and almost 100% CH 4 selectivity at a low temperature of 275 • C. During the tested period of 500 h, CO 2 conversion and CH 4 selectivity over Ni-Ce-Zr catalyst kept constant under 300 • C.

show abstract

The impact of dopants on the activity and selectivity of a Ni-based methanation catalyst

Cited by 56 publications

References 29 publications

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material Ce_xZr_1−xO₂ Supported NiCo Bimetallic Nanocatalysts

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material Ce_xZr_1−xO₂ Supported NiCo Bimetallic Nanocatalysts

Enhanced oxygen mobility and reactivity for ethanol steam reforming

Methanation of Carbon Dioxide over Ni–Ce–Zr Oxides Prepared by One-Pot Hydrolysis of Metal Nitrates with Ammonium Carbonate

Contact Info

Product

Resources

About

The impact of dopants on the activity and selectivity of a Ni-based methanation catalyst

Cited by 56 publications

References 29 publications

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material CexZr1−xO2 Supported NiCo Bimetallic Nanocatalysts

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material CexZr1−xO2 Supported NiCo Bimetallic Nanocatalysts

Enhanced oxygen mobility and reactivity for ethanol steam reforming

Methanation of Carbon Dioxide over Ni–Ce–Zr Oxides Prepared by One-Pot Hydrolysis of Metal Nitrates with Ammonium Carbonate

Contact Info

Product

Resources

About

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material Ce_xZr_1−xO₂ Supported NiCo Bimetallic Nanocatalysts

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material Ce_xZr_1−xO₂ Supported NiCo Bimetallic Nanocatalysts