Effect of silver modification on structure and catalytic performance of Ni-Mg/diatomite catalysts for edible oil hydrogenation
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2009
Authors
Stanković, Miroslav
Gabrovska, Margarita

Krstić, Jugoslav

Tzvetkov, P.
Shopska, M.
Tsacheva, T.
Banković, Predrag

Edreva-Kardjieva, R.
Jovanović, D.
Article (Published version)

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Silver modified Mg-Ni/diatomite materials with ratios of SiO2/Ni = 1.07 and Mg/Ni = 0.1, differing in Ag content (Ag/Ni = 0.025 and 0.1) were prepared by the precipitation-deposition method. The effects of silver presence and content on the structure, morphology, texture and H2-adsorption capacity of the obtained precursors were studied by X-ray diffraction, scanning electron microscopy, Hg-porosimetry and H2-chemisorption techniques. The catalytic performance of the corresponding catalysts in the soybean oil hydrogenation was investigated. The increase of the silver loading resulted in the development of macroporosity and increase in the total sample porosity. The decrease of both H2-adsorption capacity and hydrogenation activity are related to the metallic silver covering and blocking effects on the Ni2+ species, thus hampering the access of hydrogen. The decrease of hydrogenation activity and favorable limiting of cis-trans isomerization on the silver modified catalyst are explained... by Horiuti-Polanyi mechanism based on the assumption that hydrogenation and isomerization proceed at the same active metallic nickel sites via half-hydrogenated intermediates. It was shown that the adjustment of the catalyst composition by changing the content of silver modifier offers the possibility to control the total amount of solid fat content, stearic acid and detrimental trans fatty acids in the hydrogenated derivatives. The catalyst with higher silver content is proposed as a promising candidate for selective edible oil hydrogenation catalyst.
Keywords:
cis-trans isomerization / Mg-Ni/diatomite catalyst / Silver modifier / Soybean oil hydrogenation activity / TextureSource:
Journal of Molecular Catalysis A: Chemical, 2009, 297, 1-2, 54-62Publisher:
- Elsevier
Funding / projects:
- National Science Fund at the Ministry of Education and Science of Bulgaria for the partial financial support (Project X-1411). The authors (M.St., J.K., P.B. and D.J.) greatly acknowledge the support of the Serbian Ministry of Science through the Project
DOI: 10.1016/j.molcata.2008.09.004
ISSN: 1381-1169
WoS: 000262743800007
Scopus: 2-s2.0-57149124628
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IHTMTY - JOUR AU - Stanković, Miroslav AU - Gabrovska, Margarita AU - Krstić, Jugoslav AU - Tzvetkov, P. AU - Shopska, M. AU - Tsacheva, T. AU - Banković, Predrag AU - Edreva-Kardjieva, R. AU - Jovanović, D. PY - 2009 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/593 AB - Silver modified Mg-Ni/diatomite materials with ratios of SiO2/Ni = 1.07 and Mg/Ni = 0.1, differing in Ag content (Ag/Ni = 0.025 and 0.1) were prepared by the precipitation-deposition method. The effects of silver presence and content on the structure, morphology, texture and H2-adsorption capacity of the obtained precursors were studied by X-ray diffraction, scanning electron microscopy, Hg-porosimetry and H2-chemisorption techniques. The catalytic performance of the corresponding catalysts in the soybean oil hydrogenation was investigated. The increase of the silver loading resulted in the development of macroporosity and increase in the total sample porosity. The decrease of both H2-adsorption capacity and hydrogenation activity are related to the metallic silver covering and blocking effects on the Ni2+ species, thus hampering the access of hydrogen. The decrease of hydrogenation activity and favorable limiting of cis-trans isomerization on the silver modified catalyst are explained by Horiuti-Polanyi mechanism based on the assumption that hydrogenation and isomerization proceed at the same active metallic nickel sites via half-hydrogenated intermediates. It was shown that the adjustment of the catalyst composition by changing the content of silver modifier offers the possibility to control the total amount of solid fat content, stearic acid and detrimental trans fatty acids in the hydrogenated derivatives. The catalyst with higher silver content is proposed as a promising candidate for selective edible oil hydrogenation catalyst. PB - Elsevier T2 - Journal of Molecular Catalysis A: Chemical T1 - Effect of silver modification on structure and catalytic performance of Ni-Mg/diatomite catalysts for edible oil hydrogenation VL - 297 IS - 1-2 SP - 54 EP - 62 DO - 10.1016/j.molcata.2008.09.004 ER -
@article{ author = "Stanković, Miroslav and Gabrovska, Margarita and Krstić, Jugoslav and Tzvetkov, P. and Shopska, M. and Tsacheva, T. and Banković, Predrag and Edreva-Kardjieva, R. and Jovanović, D.", year = "2009", abstract = "Silver modified Mg-Ni/diatomite materials with ratios of SiO2/Ni = 1.07 and Mg/Ni = 0.1, differing in Ag content (Ag/Ni = 0.025 and 0.1) were prepared by the precipitation-deposition method. The effects of silver presence and content on the structure, morphology, texture and H2-adsorption capacity of the obtained precursors were studied by X-ray diffraction, scanning electron microscopy, Hg-porosimetry and H2-chemisorption techniques. The catalytic performance of the corresponding catalysts in the soybean oil hydrogenation was investigated. The increase of the silver loading resulted in the development of macroporosity and increase in the total sample porosity. The decrease of both H2-adsorption capacity and hydrogenation activity are related to the metallic silver covering and blocking effects on the Ni2+ species, thus hampering the access of hydrogen. The decrease of hydrogenation activity and favorable limiting of cis-trans isomerization on the silver modified catalyst are explained by Horiuti-Polanyi mechanism based on the assumption that hydrogenation and isomerization proceed at the same active metallic nickel sites via half-hydrogenated intermediates. It was shown that the adjustment of the catalyst composition by changing the content of silver modifier offers the possibility to control the total amount of solid fat content, stearic acid and detrimental trans fatty acids in the hydrogenated derivatives. The catalyst with higher silver content is proposed as a promising candidate for selective edible oil hydrogenation catalyst.", publisher = "Elsevier", journal = "Journal of Molecular Catalysis A: Chemical", title = "Effect of silver modification on structure and catalytic performance of Ni-Mg/diatomite catalysts for edible oil hydrogenation", volume = "297", number = "1-2", pages = "54-62", doi = "10.1016/j.molcata.2008.09.004" }
Stanković, M., Gabrovska, M., Krstić, J., Tzvetkov, P., Shopska, M., Tsacheva, T., Banković, P., Edreva-Kardjieva, R.,& Jovanović, D.. (2009). Effect of silver modification on structure and catalytic performance of Ni-Mg/diatomite catalysts for edible oil hydrogenation. in Journal of Molecular Catalysis A: Chemical Elsevier., 297(1-2), 54-62. https://doi.org/10.1016/j.molcata.2008.09.004
Stanković M, Gabrovska M, Krstić J, Tzvetkov P, Shopska M, Tsacheva T, Banković P, Edreva-Kardjieva R, Jovanović D. Effect of silver modification on structure and catalytic performance of Ni-Mg/diatomite catalysts for edible oil hydrogenation. in Journal of Molecular Catalysis A: Chemical. 2009;297(1-2):54-62. doi:10.1016/j.molcata.2008.09.004 .
Stanković, Miroslav, Gabrovska, Margarita, Krstić, Jugoslav, Tzvetkov, P., Shopska, M., Tsacheva, T., Banković, Predrag, Edreva-Kardjieva, R., Jovanović, D., "Effect of silver modification on structure and catalytic performance of Ni-Mg/diatomite catalysts for edible oil hydrogenation" in Journal of Molecular Catalysis A: Chemical, 297, no. 1-2 (2009):54-62, https://doi.org/10.1016/j.molcata.2008.09.004 . .