Effect of tin on Ru-B/γ-Al2O3 catalyst for the hydrogenation of ethyl lactate to 1,2-propanediol

Efficient Hydrogenation of Ethyl Lactate to 1,2-Propanediol over Ru–B/TiO2 in Aqueous Solution

“…17 The result indicated that the metal particles are amorphous alloy formed between Ru and B, which is consistent with the reported result. 12 The XRD pattern of Ru-B/TiO 2 exhibited no ruthenium particles were detected and this also indicated that ruthenium particles are amorphous and highly dispersed on TiO 2 .…”

“…12,13 In this case, the catalyst, in which the second metal composition was missing, still showed a high efficiency in water for the hydrogenation of ethyl lactate to 1,2-PDO and TOF was up to 18.4 h À1 . Even if the reaction temperature decreased to 90 C and extended the time to 12 h, the conversion of 1,2-PDO reached 98.0% and the TOF (6.9 h À1 ) was still higher than the reported value 12,13 (Table 2). To our knowledge, this is the best result for the hydrogenation of ethyl lactate to 1,2-PDO and this is the first discovery that water can play a great promotion role for the hydrogenation of ethyl lactate.…”

“…The conclusion was also demonstrated by the existence of C 2 H 6 in the gas chromatogram of vent gas. Fan et al 12,13 found that monometallic catalyst Ru-B/-Al 2 O 3 was not suitable for producing 1,2-PDO via the hydrogenation route of ethyl lactate as it only gave a selectivity of 50.7% to 1,2-PDO at a conversion of 78.7%. However, the activity of Ru-B/-Al 2 O 3 and the selectivity to 1,2-PDO could be improved by introducing the second metal component tin into it.…”

“…10 Over Ru/C, 1,2-propanediol was obtained at the reaction temperature of 150 C and hydrogen pressure of 14.5 MPa. 11 Recently, it was found that the introduction of tin was an effective method to improve the hydrogenation activity of ruthenium-based catalyst, [12][13][14] but the hydrogenation was still carried out under the conditions of 150 C and 5.5 MPa. To our knowledge, an organic solvent is the best choice in order to obtain a good result for the hydrogenation of lactates to 1,2-PDO.…”

Promotive Effect of Sn2+ on Cu0/Cu+ Ratio and Stability Evolution of Cu/SiO2 Catalyst in the Hydrogenation of Dimethyl Oxalate

“…Sn species is a kind of promoter that improves the dispersion of active metals and stability of the catalyst [12][13][14][15]. Wang et al, reported that the selectivity and stability of isobutane dehydrogenation can be significantly enhanced by the addition of tin in Ni/SiO 2 catalyst [16].…”