Fluorine-Modified Mesoporous Ni–Mg–Al Mixed Oxides for Partial Oxidation of Methane

Zhang, Jun; Wei, Wei; Sun, Yuhan

doi:10.1007/s10562-010-0268-5

Cited by 10 publications

(8 citation statements)

References 47 publications

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“…Similar results were obtained by Zhang et al [64]. They stated that 6.5 mol % La was suitable, and 99% of CH 4 conversion, 93% of CO selectivity and 96% of H 2 selectivity could be achieved at 1,053 K. Fluorine element could also be introduced to Ni-Mg-Al hydrotalcite [65] to modify the basic properties of catalyst. Evaluation in POM revealed that, such a catalyst was stable without deactivation after 120 h life-test at 1,053 K. Trace amount of noble metals were also effective in reducing carbon deposition on Ni-Mg-Al hydrotalcite [66].…”

Section: Hydrotalcite Typesupporting

confidence: 82%

Recent Progress on Ni-Based Catalysts in Partial Oxidation of Methane to Syngas

Liu

2012

Catal Surv Asia

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The partial oxidation of methane (POM) to syngas has attracted the attentions of scientists in the recent 20-30 years due to the depletion of methane and its obvious advantages. Ni-based catalysts were most widely employed in the POM because of their comparable catalytic performance with noble metal-based catalysts as well as their cheap prices. However, Ni-based catalysts were suffered from carbon deposition and sintering which were the main reasons for catalyst deactivation. Therefore it's necessary to improve the abilities of Ni-based catalysts to resist carbon deposition and sintering. In this review, types of Ni-based catalysts that could be used in the POM to syngas are reviewed and at last, the future of Ni-based catalysts in the POM is discussed.

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Section: Hydrotalcite Typesupporting

confidence: 82%

Recent Progress on Ni-Based Catalysts in Partial Oxidation of Methane to Syngas

Liu

2012

Catal Surv Asia

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“…The results revealed that fluorine was successfully introduced into Ni-Mg-Al mixed oxide via the high dispersion of MgF 2 . Such catalysts showed a high performance over POM without deactivation even after 120 h run at 1023 K. This could be reasonably attributed to the promotional effect of the F-anions, which improved the homogeneous distribution of nickel and basicity of the catalyst with high resistance to coking and sintering [56]. By repeated "calcination-reconstruction" cycles, transition metals (Cr, Fe, Co, Ni and Cu) were introduced with ruthenium into layered double hydroxide structure.…”

Section: Hydrotalcite Precursorsmentioning

confidence: 97%

“…Increasing the silicate load resulted in a decrease of the specific surface area and the Ni dispersion. Moreover, the samples with large silicate content were deactivated by oxidation of metallic nickel particles [56]. Hydrotalcite structure also allows the introduction of promoters, such as halogens.…”

Section: Hydrotalcite Precursorsmentioning

confidence: 99%

Recent Developments in the Partial Oxidation of Methane to Syngas

Al-Sayari¹

2013

TOCATJ

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Natural gas is catalytically converted into several bulk chemicals such as ammonia, methanol, dimethyl ether, and synthetic liquid fuels by Fischer-Tropsch synthesis and similar processes. The main step in the conversion of natural gas to these products is the production of synthesis gas with the desired composition ranging from H 2 /CO = 3:1 used for the production of ammonia to the 1:1 mixture preferred for production of dimethyl ether. Catalysts and catalytic processes are important in the production of synthesis gas from natural gas. In this work, relevant catalytic systems employed recently in the production of syngas by the catalytic partial oxidation of methane, as well as experimental evidences on the reaction mechanisms are examined. Differences in methane dissociation, binding site preferences, stability of OH surface species, surface residence times of active species and contributions from lattice oxygen atoms and support species are considered. The methane dissociation requires reduced metal sites, but at elevated temperatures oxides of active species may be reduced by direct interaction with methane or from the reaction with H 2 and CO (or C). The comparison of elementary reaction steps on Pt and Rh illustrates the fact that a key factor to produce hydrogen as primary product is a high activation energy barrier to the formation of OH. Another essential property for the formation of H 2 and CO as primary products is a low surface coverage of intermediates, such that the probability of O-H, OH-H and CO-O interactions is reduced.

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“…When layered double hydroxides are modified by SDS, their crystallinity is decreased and morphology is less uniform . In addition, the incorporation of Zn might make the structure of NiAl layered double hydroxides occur as re‐combination . Fig.…”

Section: Resultsmentioning

confidence: 99%

Flame Resistance of Polylactic Acid With Cyclophosphazene Derivative and NiAl Layered Double Hydroxide Doped Zn

et al. 2017

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NiAl layered double hydroxide doped Zn with dodecylbenzenesulfonate anions (NiZnAl) was prepared by one‐step coprecipitation method. Hexaphenoxycyclotriphosphazene (HPCP) is a cyclophosphazene derivative. NiZnAl first combined with HPCP were used to prepare polylactic acid (PLA) composites. Effect of NiZnAl and HPCP on flame retardancy of PLA was investigated. NiZnAl exhibited nano‐dispersion in PLA composites, and its layers were intercalated by PLA chains. Limiting oxygen index value of all the PLA composites with incorporation of HPCP and NiZnAl increased, and UL‐94 tests passed V0 ratings. With the presence of NiZnAl in PLA/HPCP composites, the amount of graphite crystalline carbon after burning was increased. High peak of heat release rate, heat release capacity, and the total heat release had a big reduction. The amount of char residue was increased apparently. The thermal degradation process was delayed. The summary results suggested that NiZnAl and HPCP had a good synergistic flame retardant effect in PLA. POLYM. COMPOS., 39:3994–3999, 2018. © 2017 Society of Plastics Engineers

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Fluorine-Modified Mesoporous Ni–Mg–Al Mixed Oxides for Partial Oxidation of Methane

Cited by 10 publications

References 47 publications

Recent Progress on Ni-Based Catalysts in Partial Oxidation of Methane to Syngas

Recent Progress on Ni-Based Catalysts in Partial Oxidation of Methane to Syngas

Recent Developments in the Partial Oxidation of Methane to Syngas

Flame Resistance of Polylactic Acid With Cyclophosphazene Derivative and NiAl Layered Double Hydroxide Doped Zn

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