Measuring the acid-base properties of supported nickel catalysts using temperature-programmed desorption of ammonia

Verhaak, M.J.F.M.; Dillen, A.J. van; Geus, J.W.

doi:10.1016/0926-860x(93)80251-k

Cited by 49 publications

(23 citation statements)

References 12 publications

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“…XRD data shows that metallic Ni is formed in the nitrided Ni/␥-Al 2 O 3 , and no Ni 3 N phase emerges. It was reported that Ni 3 N would decompose at temperatures higher than 573 K [17]. Therefore, it is probable that nickel is mainly present as metallic Ni in nitrided Ni in this study.…”

Section: The Role Of Ni In Hdn Reactionmentioning

confidence: 90%

Characterization and catalytic properties of supported nickel molybdenum nitrides for hydrodenitrogenation

Wang

Zhang

et al. 2001

Applied Catalysis A: General

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Section: The Role Of Ni In Hdn Reactionmentioning

confidence: 90%

Characterization and catalytic properties of supported nickel molybdenum nitrides for hydrodenitrogenation

Wang

Zhang

et al. 2001

Applied Catalysis A: General

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“…Nitrogen atoms would adsorb on the Ni surface more strongly than hydrogen atoms. It has been proposed by Verhaak et al [25] that the formation of nickel nitride and its subsequent decomposition to metallic nickel and nitrogen proceeded above 300ºC during the NH3-TPSR measurement over Ni/Al2O3 catalyst as follows;…”

Section: Desorption Behavior Of Gas Species Over Catalystsmentioning

confidence: 99%

Promotion effect of rare-earth elements on the catalytic decomposition of ammonia over Ni/Al2O3 catalyst

Okura

Okanishi

Muroyama

et al. 2015

Applied Catalysis A: General

107

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Please cite this article as: Kaname Okura, Takeou Okanishi, Hiroki Muroyama, Toshiaki Matsui, Koichi Eguchi, Promotion effect of rare-earth elements on the catalytic decomposition of ammonia over Ni/Al2O3 catalyst, Applied Catalysis A, General http://dx. Graphical abstract Graphical abstract Graphical abstract Graphical abstractHighlights Highlights Highlights Highlights • The Ni/Al2O3 catalysts modified by rare-earth elements were investigated.• The addition of rare-earth elements promoted ammonia decomposition reaction.• La-modified Ni/Al2O3 was most active in this study.• The hydrogen inhibition phenomenon was alleviated by the modification. AbstractAmmonia decomposition has attracted much attention as an efficient method for the on-site generation of hydrogen. In this study, alumina-supported nickel catalysts (Ni/Al2O3) modified by rare-earth elements were prepared by the impregnation method and their catalytic activity for the ammonia decomposition was investigated. The addition of rare-earth elements promoted the decomposition reaction over catalysts and the La-modified catalyst achieved the highest ammonia conversion in this work. For the modified catalysts, the adsorbed hydrogen, which is known to be an inhibitive species for the ammonia decomposition, desorbed at lower temperature compared to the unmodified one. Therefore, the effective alleviation of hydrogen inhibition would be responsible for the activity enhancement for the modified catalysts. The reaction kinetics study also supported this proposed mechanism. For the La-modified catalyst, the optimal pretreatment condition was investigated to enhance the catalytic activity.The catalyst calcined at 400ºC followed by reduction at 600ºC exhibited the highest ammonia conversion of 94% at 550ºC.

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“…The NH 3 TPD of the samples also decreases slightly with the addition of cerium to the catalyst, which confirms that the addition of cerium reduces the acidity and slightly increases the basicity of the samples. The NH 3 TPD of the sample was considered at the lower temperature range, i.e., up to 200°C, as at higher temperatures ammonia may react with Ni to form nickel nitride and evolve hydrogen, after which by simply heating it evolves nitrogen [22], Hence NH 3 TPD of the samples is considered only in the lower-temperature range. With the introduction of nickel nanoparticles the NH 3 TPD peak intensity decreases, indicating the presence of less acidic sites in the sample.…”

Section: Temperature-programmed Desorptionmentioning

confidence: 99%

Support interaction of Ni nanocluster based catalysts applied in CO2 reforming

Das

Thakur

Bag

et al. 2015

Journal of Catalysis

109

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Measuring the acid-base properties of supported nickel catalysts using temperature-programmed desorption of ammonia

Cited by 49 publications

References 12 publications

Characterization and catalytic properties of supported nickel molybdenum nitrides for hydrodenitrogenation

Characterization and catalytic properties of supported nickel molybdenum nitrides for hydrodenitrogenation

Promotion effect of rare-earth elements on the catalytic decomposition of ammonia over Ni/Al2O3 catalyst

Support interaction of Ni nanocluster based catalysts applied in CO2 reforming

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