Efficient conversion of lactic acid to alanine over noble metal supported on Ni@C catalysts

Abstract

Lactic acid can be converted into alanine with a high selectivity of 91.4% over Ru/Ni@C catalysts.

Dehydrogenation of Glycerol for CO2 Reduction in One‐Pot Production of Lactic Acid and Formic Acid with Ru‐MACHO

“…Then we used 13 C labeled NaH 13 CO 3 as the CO 2 source to conduct an isotopic tracer technique and combined it with 13 C-NMR analysis to further confirm that formate species were generated from CO 2 hydrogenation (Figure S4). After removing the inorganic 13 CO 2 , a large amount of 13 C was detected only at the chemical shift of 165 ppm. [24] The chemical shifts of different types C in the carbon spectrum are different, and 165 ppm corresponded to 13 C in formate species.…”

“…After removing the inorganic 13 CO 2 , a large amount of 13 C was detected only at the chemical shift of 165 ppm. [24] The chemical shifts of different types C in the carbon spectrum are different, and 165 ppm corresponded to 13 C in formate species. The results show that the formate species formed are mainly transformed by NaH 13 CO 3 .…”

“…In order to reduce the signal interference from a large number of solvents, freeze-drying was conducted with the samples for 48 h. And then, 0.5 mL D 2 O/ H 2 O were respectively added to the samples for 1 H-NMR/ 2 H-NMR analysis. In addition, the samples for 13 C-NMR analysis need to be pretreated with sulfuric acid until the pH values of the solution reached 2-3 to remove excess inorganic CO 2 . Put 2 mL of prepared H 2 O/D 2 O mixture with 0.33 M glycerol, 7.92 g KHCO 3 (6.65 g NaH 13 CO 3 ) and 3 mg Ru-MACHO (regR) into the test tube.…”

“…According to the current literature, there are many catalysts used to convert glycerol into LA, such as Pt/ZrO 2 , [8,9] Au−Pt/TiO 2 , [10] Pt/AC [11] and other noble metal supported catalysts [12,13] . However, their further applications are limited due to the scarcity of precious metals.…”

“…[6,7] According to the current literature, there are many catalysts used to convert glycerol into LA, such as Pt/ZrO 2 , [8,9] AuÀ Pt/ TiO 2 , [10] Pt/AC [11] and other noble metal supported catalysts. [12,13] However, their further applications are limited due to the scarcity of precious metals. In addition to inorganic catalysts, metal complexes such as Fe, [14] Ir, [15] and Ru [16,17] are also widely used as catalysts, which not only reduce the cost but also ensure the high selectivity of LA.…”