Effects of metal content on activity and stability of Ni-Co bimetallic catalysts for CO2 reforming of CH4

Zhang, Jianguo; Wang, Hui; Dalai, Ajay K.

doi:10.1016/j.apcata.2008.01.027

Cited by 299 publications

(141 citation statements)

References 41 publications

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“…This was explained by synergetic interactions between Ni and Co, which resulted in the formation of highly dispersed small Ni crystallites. On the contrary, Zhang et al [98] reported the best performance of Ni-Co hydrotalcite-derived catalysts for Ni/Co molar ratios close to unity. The authors, however, noted that the amount of metals had also an effect on the catalyst performance, and catalysts with low content of Ni (1.83-3.61 wt %) and Co (2.76-4.43 wt %) showed better performance.…”

Section: Other Promotersmentioning

confidence: 98%

A Short Review on the Catalytic Activity of Hydrotalcite-Derived Materials for Dry Reforming of Methane

et al. 2017

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Nickel-containing hydrotalcite-derived materials have been recently proposed as promising materials for methane dry reforming (DRM). Based on a literature review and on the experience of the authors, this review focuses on presenting past and recent achievements on increasing activity and stability of hydrotalcite-based materials for DRM. The use of different NiMgAl and NiAl hydrotalcite (HT) precursors, various methods for nickel introduction into HT structure, calcination conditions and promoters are discussed. HT-derived materials containing nickel generally exhibit high activity in DRM; however, the problem of preventing catalyst deactivation by coking, especially below 700 • C, is still an open question. The proposed solutions in the literature include: catalyst regeneration either in oxygen atmosphere or via hydrogasification; or application of various promoters, such as Zr, Ce or La, which was proven to enhance catalytic stability.

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Section: Other Promotersmentioning

confidence: 98%

A Short Review on the Catalytic Activity of Hydrotalcite-Derived Materials for Dry Reforming of Methane

et al. 2017

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“…They reported that increased metal content enhanced the CO 2 conversion and very low carbon deposits were formed, albeit that they used low metal concentrations (<4 wt.%). Zhang et al [32] also reported that lower Ni-Co content catalysts had lower carbon deposition, but higher Ni-Co content produced significant carbon deposition when the catalysts were used over extended periods (~250 h). For the work reported here, there was no carbon deposition at the higher Co content NiCo-Al catalyst.…”

Section: Experimental Systemmentioning

confidence: 99%

Influence of nickel-based catalysts on syngas production from carbon dioxide reforming of waste high density polyethylene

Saad

Nahil

et al. 2015

Fuel Processing Technology

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Abstract:Syngas production (H 2 and CO) from carbon dioxide reforming of high density polyethylene (HDPE) over Ni-Al catalyst was evaluated in a two-stage fixed bed reactor. Syngas production was favoured by CO 2 addition, with the highest production of 138.81 mmol syngas g -1 HDPE , which was about six times higher than non-catalytic, non-CO 2 addition. The catalytic performances of nickel-based catalysts with different promoter metals (Cu, Mg and Co) in the CO 2 reforming of HDPE were also studied. It was found that Ni-Co-Al had an excellent anti-coking performance, with no detectable formation of coke on the catalyst surface. Moreover, the syngas production was significantly improved by the addition of Co compared to the Cu and Mg metal promoters. The CO 2 conversion for Ni-Co-Al catalyst was also the highest at 57.62 %.Further investigation of the effect of Co concentration on CO 2 reforming of HDPE showed that the higher Co content, the higher syngas production and CO 2 conversion.

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“…XRD pattern of spent Ni/Mg.Al.550 ( Figure 2a) displays a similar profile as the fresh sample, proving the stability of the material during the reaction. This result is probably due to the incorporation of Ni into the solid solution or/and the MgAl2O4 spinel framework since such stable phases prevent the structural transformation at the high reaction temperature [17,18,21]. The N2 adsorption-desorption isotherms together with the BJH (Barrett-Joyner-Halenda) pore size distributions (PSD) of the Mg.Al.550.800 support and corresponding Ni catalysts are shown in Figures 3 and 4, respectively.…”

Section: Characterization Of the Catalystsmentioning

confidence: 99%

Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane

Armbruster

Atia

et al. 2017

Catalysts

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Methane dry reforming (DRM) was investigated over highly active Ni catalysts with low metal content (2.5 wt %) supported on Mg-Al mixed oxide. The aim was to minimize carbon deposition and metal sites agglomeration on the working catalyst which are known to cause catalyst deactivation. The solids were characterized using N 2 adsorption, X-ray diffraction, temperature-programmed reduction, X-ray photoelectron spectroscopy, and UV-Vis diffuse reflectance spectroscopy. The results showed that MgO-Al 2 O 3 solid solution phases are obtained when calcining Mg-Al hydrotalcite precursor in the temperature range of 550-800 • C. Such phases contribute to the high activity of catalysts with low Ni content even at low temperature (500 • C). Modifying the catalyst preparation with citric acid significantly slows the coking rate and reduces the size of large octahedrally coordinated NiO-like domains, which may easily agglomerate on the surface during DRM. The most effective Ni catalyst shows a stable DRM course over 60 h at high weight hourly space velocity with very low coke deposition. This is a promising result for considering such catalyst systems for further development of an industrial DRM technology.

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Effects of metal content on activity and stability of Ni-Co bimetallic catalysts for CO2 reforming of CH4

Cited by 299 publications

References 41 publications

A Short Review on the Catalytic Activity of Hydrotalcite-Derived Materials for Dry Reforming of Methane

A Short Review on the Catalytic Activity of Hydrotalcite-Derived Materials for Dry Reforming of Methane

Influence of nickel-based catalysts on syngas production from carbon dioxide reforming of waste high density polyethylene

Development of Active and Stable Low Nickel Content Catalysts for Dry Reforming of Methane

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