Platinum Supported on WO₃-Doped Aluminosilicate: A Highly Efficient Catalyst for Selective Hydrogenolysis of Glycerol to 1,3-Propanediol

Abstract

Platinum-loaded WO 3 −Al 2 O 3 −SiO 2 catalysts, denoted as Pt/ WAlSi, in glycerol hydrogenolysis to 1,3-propanediol (1,3-PDO) with a batch reactor were investigated, wherein the WO 3 -doped silica−alumina material with a homogeneous dispersion was prepared by sol−gel method and Pt was loaded onto it by incipient wetness impregnation. The catalysts were characterized by powder XRD, N 2 adsorption−desorption, TEM, CO chemisorption, NH 3 -TPD, Py-IR, and XPS. The WO 3 /Al 2 O 3 ratio and Pt loading amount are shown to be of importance in determining the activity and directing the selectivity to 1,3-PDO. It was found that 2% Pt/WAlSi with the ratio of WO 3 to Al 2 O 3 at 2 has a suitable Brønsted acidity and contributes to a high selectivity to 1,3-PDO close to 56% at 48% glycerol conversion, and the space time yield for 1,3-PDO in an optimized reaction condition could reach 18.34 g/(g Pt h), much higher than the best result reported in the literature. A plausible mechanism of glycerol hydrogenolysis was proposed from the reaction results.

Effective Hydrogenolysis of Glycerol to 1,3‐Propanediol over Metal‐Acid Concerted Pt/WOx/Al2O3 Catalysts

“…Therefore, the selective hydrogenolysis of glycerol to 1,3‐PDO is highly desirable yet more challenging. Driven by the great potential for practical applications, this reaction has been intensively studied . So far, it has been established that a noble metal in combination with an oxophilic metal oxide, typically like Ir−ReO x, Rh−ReO x and Pt−WO x , is effective for the formation of 1,3‐PDO.…”

Effect of Tungsten Species on Selective Hydrogenolysis of Glycerol to 1,3‐Propanediol

“…Besides, Feng et al. reported a study to use Pt‐loaded WO 3 ‐Al 2 O 3 ‐SiO 2 catalysts (Pt/WAlSi) for glycerol hydrogenolysis [45] . The corresponding glycerol conversion and 1,3‐PDO selectivity reached 48 and 56 % under 6 MPa H 2 , at 433 K, for 12 h, respectively.…”

“…Generally, two reaction mechanisms in glycerol hydrogenolysis to 1,3‐PDO over tungsten‐containing catalysts have been proposed [45,68,74,83] . The first reaction mechanism basically follows the dehydration hydrogenation mode, as shown in Scheme 5.…”

Glycerol Transformation to Value-Added 1,3-Propanediol Production: A Paradigm for a Sustainable Biorefinery Process

“…In comparison to a simple protic acid, the addition of H 2 WO 4 to the catalyst enhanced the catalytic performance to propanediols. Later extensive research work was carried out based on noble metaland tungsten-based catalysts (Pt-WOx) [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. While Pt/WOx catalysts stand out to be the most outstanding high-performance catalysts for selective hydrogenolysis of glycerol to 1,3-PDO compared to other noble metals, Cu-based WOx supported on titania catalyst has also been investigated and was found to efficient in the production of 1,3-PDO [42].…”