1/2/2023 0 Comments Sn xps peak ratio![]() One concern with these catalysts is the use, handling, and disposal of environmentally hazardous Cr compounds prompting the use of Cr-free catalysts. The main source of fatty alcohols is the catalytic hydrogenation of fatty acid methyl esters over Cu-Cr catalysts under severe reaction conditions (250–350☌ and 20–35 MPa). Fatty alcohols also find widespread use in the cosmetics industry, being used in the formulation of oily liquid soaps, shampoos and hair conditioners, skin emollients, emulsifiers, and densifying creams and lotions. Introductionįatty alcohols derived from renewable raw materials are widely used in the production of nonionic amphiphilic tensioactive compounds such as fatty alcohol sulfates, ether sulfates, and alkyl ethoxylate surfactants. However it has enough activity for hydrogenating the C=C double bonds to produce the saturated methyl ester. At a high Sn content (4%) the catalyst has lower selectivity to oleyl alcohol due to its low capacity for hydrogenating the carbonyl group. As a consequence stearyl alcohol is produced with high yield. At a low Sn loading (0.5%) the catalyst has high activity for hydrogenation of the carbonyl group and the carbon-carbon double bond. ![]() The catalyst with the highest activity and selectivity towards oleyl alcohol is Ru(1%)-Sn(2%)-B/Al 2O 3. Sn addition acts positively over the oleyl selectivity by reducing the rates of C=O and C=C saturation but also decreases the global activity. This study focuses on the influence of the Ru/Sn ratio on the catalytic hydrogenation of methyl oleate to oleyl alcohol using Ru-Sn-B catalysts, notably on the catalytic activity and selectivity. ![]()
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