Improving Selectivity to 1,3-Propanediol for Glycerol Hydrogenolysis Using W- and Al-Incorporated SBA-15 as Support for Pt Nanoparticles

Abstract

Tungsten and aluminum were directly incorporated into SBA-15 via one-step synthesis method under an acidic medium. The W-and Al-incorporated SBA-15 was applied as support for Pt nanoparticles to catalyze glycerol hydrogenolysis toward 1,3-propanediol. A combination of the characterization techniques showed that the tungsten and aluminum were incorporated into SBA-15 homogeneously, and the platinum nanoparticles could be uniformly dispersed on the modified-SBA-15. The catalytic performance of Pt-loaded SBA-15 could be significantly improved after the incorporation of tungsten and aluminum into SBA-15, reaching a 1,3-PDO selectivity near 50% when the glycerol conversion was 66%. The glycerol hydrogenolysis reaction proceeds through a dehydration−hydrogenation process, and the enhanced 1,3-PDO selectivity greatly benefited from the synergism between Brønsted acid and Lewis acid sites, which is tightly related with the incorporation of tungsten and aluminum species on the modified SBA-15.

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

“…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. In comparison with ReO x , WO x offers the advantage of better leaching‐resistance and lower cost, therefore shows greater potential for practical applications.…”

Guanine‐La complex supported onto SBA‐15: A novel efficient heterogeneous mesoporous nanocatalyst for one‐pot, multi‐component Tandem Knoevenagel condensation–Michael addition–cyclization Reactions

“…The FT‐IR spectra of the parent SBA‐15 (a) nPrCl‐SBA‐15 (b), guanine‐SBA‐15 (c) and La@guanine@SBA‐15 (d) are shown in Figure . Considering SBA‐15, the present bands at about 1082 cm −1 , 807 cm −1 and 462 cm −1 attributed to the vibration modes of asymmetric stretching, symmetric stretching and bending Si‐O–Si . The presence of hydroxyl groups is well seen at 3443 cm −1 (Figure (a)) .…”

“…Also, it was found that the position of the d 100 peak in the catalyst shifted to lower values, which are due to the shrinking pore size, and reduced the order of homogeneity of the pores in comparison to SBA‐15. This may correspond to the re‐condensation reactions of the silica with lanthanum nanoparticles in the pore channel …”

“…Considering SBA-15, the present bands at about 1082 cm −1 , 807 cm −1 and 462 cm −1 attributed to the vibration modes of asymmetric stretching, symmetric stretching and bending Si-O-Si. [14,61,62] The presence of hydroxyl groups is well seen at 3443 cm −1 (Figure 1 (a)). [14,63] In Figure 1 (b), the characteristic band at around 2935 cm −1 is duo to CH 2 vibrations corresponding to the C-H stretching and confirming the successful chloro-functionalization of SBA-15.…”

“…This may correspond to the recondensation reactions of the silica with lanthanum nanoparticles in the pore channel. [46,62,[65][66][67] Moreover, energy dispersive X-ray spectroscopy (EDS) analysis of La@guanine@SBA-15 is carried out to indicate the adsorption of La 3+ on SBA-15 surface. These results are presented in Figure 3.…”