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Mg-Ni na perlitnom nosaču kao hidrogenizacioni katalizator: uticaj sadržaja Mg i Ni

Mg-Ni supported on perlite as hydrogenation catalyst: Influence of Mg and Ni content

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2019
osnovni rad (4.285Mb)
Authors
Radonjić, Vojkan
Krstić, Jugoslav
Lončarević, Davor
Vukelić, Nikola
Jovanović, Dušan M.
Article (Published version)
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Abstract
Use of broken honeycomb-like expanded perlite as support for magnesium modified nickel catalysts in process of partial hydrogenation of sunflower oil was studied. By the use of the precipitation-deposition method, two groups of precursors were synthesized: different Ni/SiO2 mole ratios with constant Mg/Ni mole ratio 0.1, and different Mg/Ni mole ratios with constant Ni/SiO2 mole ratio 0.25. Characterizations of precursors were done (scanning electron microscopy, diffuse reflectance UV–Vis, infrared spectroscopy, N2-physisorption, temperature programmed reduction (TPR) and He-pycnometry) to determine the material differences, considering the change in morphology, structure, texture and reducibility with overall Ni and Mg content. In addition, TPR and hydrogen chemisorption were performed in order to estimate the temperature reduction range of supported precursors and the dispersion degree of nickel in reduced precursors, respectively. The interaction between Ni2+ and perlite support was... established. Different reducibility and dispersion were obtained as a function of Ni/SiO2 and Mg/Ni mole ratios. After the precursor’s reduction and paraffin oil impregnation, the obtained catalysts were tested in a sunflower oil hydrogenation reaction. Catalyst activity was monitored through the decrease of the refractive index and hydrogen consumption that gave the insight that the influence on catalyst activity represents the accessibility of triacylglycerols and not always the hydrogen determined dispersion degree

Proučavana je moguća upotreba ekspantiranog perlita, oblika lomljenog pčelinjeg saća, kao nosača magnezijum modifikovanog niklenog katalizatora u procesu parcijalne hidrogenizacije suncokretovog ulja. Primenom precipitaciono-depozicione metode, sintetisane su dve grupe prekursora: različitog molskog odnosa Ni/SiO2 sa konstantnim Mg/Ni molskim odnosom 0,1 i različitog Mg/Ni molskog odnosa sa konstantnim Ni/SiO2 molskim odnosom 0,25. Izvršena je karakterizacija prekursora (skenirajuća elektronska mikroskopija, difuziona refleksiona ULj-Vid, infracrvena spektroskopija, N2-fizisorpcija, temperaturski programirana redukcija - TPR i He-piknometrija) u cilju utvrđivanja razlika u materijalu, uzimajući u obzir promene u morfologiji, strukturi, teksturi i reducibilnosti ukupnog sadržaja Ni i Mg. Dodatno, TPR i hemisorpcija vodonika urađene su u cilju procene opsega temperature redukcije prekursora i stepena disperzije nikla u redukovanim prekursorima. Utvrđeno je postojanje interakcija i...zmeđu Ni 2+ i perlitnog nosača, a dokazana je za različite reducibilnosti i disperznosti kao funkcija Ni/SiO2 i Mg/Ni molskog odnosa. Nakon redukcije prekursora i impregnacije parafinskim uljem, dobijeni katalizatori su testirani u reakciji hidrogenizacije suncokretovog ulja. Katalitička aktivnost je praćena padom indeksa refrakcije i potrošnjom vodonika. Utvrđeno je da na katalitičku aktivnost dominantan uticaj ima dostupnost aktivnih Ni0 centara molekulima triacilglicerola, a ne njihov stepen disperzije utvrđen vodonikom.

Keywords:
reduction / perlite / nickel catalyst / magnesium / hydrogenation / redukcija / perlit / nikleni katalizator / magnezijum / hidrogenizacija
Source:
Chemical Industry & Chemical Engineering Quarterly, 2019, 25, 2, 193-206
Publisher:
  • Belgrade : Association of the Chemical Engineers of Serbia AChE
Projects:
  • Nanostructured Functional and Composite Materials in Catalytic and Sorption Processes (RS-45001)

DOI: 10.2298/CICEQ181001032R

ISSN: 14519372; 2217-7434

WoS: 000474378700010

Scopus: 2-s2.0-85070675705
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/3222
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