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

Abstract

Article Highlights • Broken honeycomb-like perlite structure as catalyst support • Morphological, textural, and structural characteristics of Ni and Mg influence • Correlation between reducibility and hydrogen chemisorption • Evaluation of lowest reduction temperature for catalyst preparation • Catalyst behavior due to Ni and Mg influence in hydrogenation process 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/SiO 2 mole ratios with constant Mg/Ni mole ratio 0.1, and different Mg/Ni mole ratios with constant Ni/SiO 2 mole ratio 0.25. Characterizations of precursors were done (scanning electron microscopy, diffuse reflectance UV-Vis, infrared spectroscopy, N 2-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 Ni 2+ and perlite support was established. Different reducibility and dispersion were obtained as a function of Ni/SiO 2 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.

Study of catalytic oxidation of toluene using Cu-Mn, Co-Mn and Ni-Mn mixed oxides catalysts

“…When compared to supported noble metal catalysts, mixed oxides have lower cost and higher resistance to impurities. Among the oxides of the present invention, the spinel-like structure has also been highlighted due to its high thermal resistance, selectivity and electronic properties, characteristics that improve oxide reducibility [17][18][19].…”

Perlite Supported Cobalt Oxide Catalyst for a Series of Liquid‐Phase Esterification Reactions

“…Owing to its floatability, rich silica and alumina content, chemically inert nature, perlite has been gaining research interest as a catalyst or catalyst support material these days. Recently, perlite has been reported as a heterogeneous catalyst in numerous applications including, Fenton degradation, [ 10 ] green synthesis of aryl/alkyl methanes, [ 11 ] photocatalysis, [ 12 ] economical preparation of xanthenes, [ 13 ] biodiesel synthesis, [ 14 ] Knoevenagel condensation, [ 15,16 ] azo dye ozonation, [ 17 ] hydrogenation, [ 18 ] etc. It is thus assumed, perlite having richer silica and alumina composition can possess a significant amount of stable surface‐active sites after proper treatment and hence can be converted into a potential heterogeneous acid catalyst for different acid‐catalyzed industrially useful organic transformations.…”

Vapor Phase Alkylation of Isomeric Cresols with Tert-Butyl Alcohol over Perlite Supported Sulfated Zirconia Catalyst

“…The floatable, inert, porous, concentric layered structure of perlite can be conveniently activated and modified by applying different activation techniques. Hence, in recent years, perlite was also utilized as an effective substrate in the synthesis of heterogeneous acid catalysts in different organic transformations, i.e., Fenton reactions of organic compounds [9], the production of aryl/alkyl methane [10], photocatalysis [11], synthesis of xanthenes [12], transesterification reactions [13], condensation reactions [14], the degradation of azo-dyes [15], hydrogenation reactions [16], etc. We recently reported the synthesis of perlite supported catalysts and their catalytic activities in a series of different types of condensation and esterification reactions [17][18][19].…”