Investigation of the promoting effect of Mn on a Pt/C catalyst for the steam and aqueous phase reforming of glycerol

Abstract

The catalytic performances in steam reforming (SR) and aqueous phase reforming (APR) of glycerol of a bimetallic Pt-Mn catalyst supported on activated carbon are investigated and correlated with the surface properties of the catalyst. Under SR conditions, Mn showed a significant promoting effect over Pt/C, both in terms of hydrogen production rate and conversion, with a higher selectivity toward the glycerol dehydration products. Upon addition of Mn the amount of strong Lewis acid sites increased, promoting the dehydration of glycerol and favoring the CO over CC cleavage at expenses of hydrogen selectivity. Conversely, under APR conditions, a slightly higher hydrogen selectivity and only minimal enhancement in hydrogen production were found, whilst the products selectivity was comparable to Pt/C. Most of Mn leached into the aqueous media, but the remaining (< 5% of the fresh parent sample) might be alloyed with Pt and promote the CO desorption from neighbor Pt sites.

Recent Advances in Glycerol Catalytic Valorization: A Review

“…On the other hand, the use of Ce or Ce-Zr oxides provides good results, due to the good thermal and mechanical resistance and redox properties of Ce. Moreover, Mg and Mg-Al oxides are used to provide basic sites for the catalyst, improving H 2 formation and limiting hydrocarbon production and subsequent coke deposition on the catalyst surface, as many studies have pointed out [57,91,93]. On the contrary, the higher the acidity of the catalyst, the higher their affinity for coke deposition [20].…”

“…It usually contains VIII group metals, or they can be bimetallic catalysts. Moreover, the use of Ni-based catalysts and other X group metals is frequent due to their activity and selectivity[20,93];• It should have good support properties (dispersion of the active phase, co-catalytic sites, etc. ); •…”

In-Situ Liquid Hydrogenation of m-Chloronitrobenzene over Fe-Modified Pt/Carbon Nanotubes Catalysts

“…The generation of H 2 and CO 2 by ethanol APR is an ideal situation. Pt-based catalysts are a type of noble metal catalysts that can be used in ethanol reforming-based hydrogen preparation [29][30][31][32]. During the hydrogen generation via ethanol reforming on Pt-based catalysts, the O-H and C-H of ethanol needed similar energy, but Pt-C was more stable than Pt-O and more likely to be formed [33,34].…”

Ethanol Steam Reforming on CexMyO2 (M: Cu, Zn, and Mn) Solid Solution Catalysts

“…Co 2 MnO 4 exhibited a desirable effect in ethanol steam reforming (ESR) and postponed catalyst deactivation 22. It was found that Mn in a Ce‐Mn composite as a catalyst in various reactions played an important role in water dissociation and easier CO oxidation 23–25. A highly favorable influence of Mn on CuZn at low temperature in ESR was also proved 26.…”