Preparation, reduction and CO chemisorption properties of cyanide-derived Ni Fe/Al2O3 catalysts

Boellaard, E.; Kraan, A.M. van der; Geus, J.W.

doi:10.1016/s0926-860x(01)00670-6

Cited by 12 publications

(4 citation statements)

References 9 publications

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“…Although multiple CO adsorption is not commonly reported for metallic Fe in NiFe alloys [62], in the case of Fe 2 P, the Fe-Fe distance is larger than in metallic Fe which may allow for multiple CO molecules to adsorb on a single site. The best documented case for multiple CO adsorption is for Rh [63], where a gem-dicarbonyl species is formed.…”

Section: Infrared Spectroscopy Of Adsorbed Comentioning

confidence: 92%

Nature of active sites in Ni2P hydrotreating catalysts as probed by iron substitution

Zhao

Oyama

Freund

et al. 2015

Applied Catalysis B: Environmental

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A series of NiFeP/SiO 2 catalysts with different Ni:Fe molar ratios (1:0, 3:1, 1:1, 1:3, 0:1) was investigated for the hydrodesulfurization (HDS) of 4,6-dimethyldibenzothiophene.The Fe component is a good probe for active sites because Ni 2 P and Fe 2 P adopt the same hexagonal crystal structure, yet Fe 2 P is completely inactive for HDS. X-ray diffraction analysis and FTIR spectroscopy of adsorbed CO indicated the formation homologous alloys. At 3.1 MPa and 613 K (340 o C) the activity of the alloys was similar to that of Ni 2 P, which was very high. There was also unprecedented selectivity towards direct desulfurization (DDS). A reconstruction of the NiFe phase occurred to expose more Ni sites, likely driven by the formation of surface Ni-S bonds as observed by EXAFS. The analysis showed that Ni(2) pyramidal sites responsible for hydrogenation were largely replaced by Fe. This left behind Ni(1) tetrahedral sites which favor DDS and explains the reactivity results.

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Section: Infrared Spectroscopy Of Adsorbed Comentioning

confidence: 92%

Nature of active sites in Ni2P hydrotreating catalysts as probed by iron substitution

Zhao

Oyama

Freund

et al. 2015

Applied Catalysis B: Environmental

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“…Limited success has been achieved in the synthesis of supported bimetallic catalysts using DCS precursors. Boellaard et al (28) described a synthesis of supported Ni-Fe catalysts from DCSs by mixing two precursors in solution in the presence of a support. Owing to the lack of interaction between bulk DCSs and the catalyst support, the deposition of DCSs on the surface of the support is less controllable.…”

Section: −mentioning

confidence: 99%

A general synthesis approach for supported bimetallic nanoparticles via surface inorganometallic chemistry

Ding

Cullen

Zhang

et al. 2018

Science

203

159

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The synthesis of ultrasmall supported bimetallic nanoparticles (between 1 and 3 nanometers in diameter) with well-defined stoichiometry and intimacy between constituent metals remains a substantial challenge. We synthesized 10 different supported bimetallic nanoparticles via surface inorganometallic chemistry by decomposing and reducing surface-adsorbed heterometallic double complex salts, which are readily obtained upon sequential adsorption of target cations and anions on a silica substrate. For example, adsorption of tetraamminepalladium(II) [Pd(NH3)42+] followed by adsorption of tetrachloroplatinate [PtCl42−] was used to form palladium-platinum (Pd-Pt) nanoparticles. These supported bimetallic nanoparticles show enhanced catalytic performance in acetylene selective hydrogenation, which clearly demonstrates a synergistic effect between constituent metals.

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“…Moreover, in connection with these studies it was found that the bimetallic systems often have completely different CO and hydrogen adsorption properties. It has also been reported that the reduction of the bimetallic Ni-Fe and Co-Fe catalysts, takes place at significantly lower temperatures than for the pure metals 48,52 .…”

Section: Other Catalytic Applications For the Alloy Systemsmentioning

confidence: 93%

Design of Heterogeneous Catalysts

Ozkan¹

2009

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cooperation related to the methanation project. Søren Dahl and Nan Topsøe from Haldor Topsøe are thanked for nice collaboration in relation to the SCR project. Within my private life in Denmark thanks is given to my family and friends-especially my parents, and my brother, Thomas, and my sister, Maria, should be mentioned here. A special thank is also given to Ulla, for always being a good friend, supportive and for listening to a lot of work/chemistry talk from time to time. My stay in the Netherlands has been one of the most inspiring and fruitful periods of my PhD. I am grateful to a lot of people for contributing to this. First of all to Professor Krijn de Jong who let me visit him and his research group at Universiteit Utrecht. From the first day I enjoyed the friendly, well-structured and intellectually inspiring atmosphere. I would also like to thank Associated Professor Harry Bitter for his interest in my work and for fruitful discussions. Special thanks should be given to Johan for showing me how everything works in the lab, being nice working together with and for helping with practical problems that arise when being in another country-including help with correcting and improving my Dutch. I would also like to thank Cor for helping with and explaining the TEM experiments. A few PhD students, Mariska, Adjan, Niels, Paul and Emiel, who have been extremely helpful with respect to experimental problems when needed, should be mentioned here too. Finally, I would like to thank all members of the Inorganic Chemistry and Catalysis group at Utrecht Universiteit for making my stay at the university a great time in coffee-breaks, at borrels etc. My social life outside work would not have been so cheerful if I had not met so many nice and kind Dutch people. I really appreciate both the company and the friendly help to correct and help me when speaking Dutch (and for talking English with me, when needed). Thus, I would like to thank all those who have contributed to making my time in Utrecht joyful. Furthermore, I would like to thank Kemisk Forenings Rejsefond, Otto Mønsteds Fond and Oticon Fonden for making my stay in the Netherlands economically possible.

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Preparation, reduction and CO chemisorption properties of cyanide-derived Ni Fe/Al2O3 catalysts

Cited by 12 publications

References 9 publications

Nature of active sites in Ni2P hydrotreating catalysts as probed by iron substitution

Nature of active sites in Ni2P hydrotreating catalysts as probed by iron substitution

A general synthesis approach for supported bimetallic nanoparticles via surface inorganometallic chemistry

Design of Heterogeneous Catalysts

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