Platinum Supported on H-Mordenite: A Highly Efficient Catalyst for Selective Hydrogenolysis of Glycerol to 1,3-Propanediol

Abstract

The selective production of 1,3-propanediol from glycerol under mild reaction conditions is of high interest. The current work describes the use of a highly selective catalyst consisting of platinum supported on mordenite zeolite employed for the first time for vapor phase hydrogenolysis of glycerol to 1,3-propanediol under atmospheric pressure. The catalysts with varying Pt content (0.5−3 wt %) were prepared and thoroughly characterized by X-ray diffraction, temperature-programmed desorption of ammonia, FT-IR of adsorbed pyridine, CO chemisorptions, transmission electron microscopy, X-ray photoelectron spectroscopy, and BET surface area. The influence of reaction parameters has been studied to unveil the optimized reaction conditions. A high 1,3-propanediol selectivity (48.6%) was obtained over a 2 wt % Pt/H−mordenite catalyst at 94.9% glycerol conversion. According to the results obtained, the selectivity to 1,3-propanediol is better influenced by Pt dispersion and Brønsted acidity of the support. A plausible reaction mechanism has been presented. The spent catalyst exhibited consistent activity and selectivity toward the desired product during the glycerol hydrogenolysis reaction.

Toward the Sustainable Synthesis of Propanols from Renewable Glycerol over MoO3-Al2O3 Supported Palladium Catalysts

“…The conversion of glycerol progressively increased from 82% and reached a maximum of 88.4% at 3 h and remained constant up until 6 h. Also, the selectivity to total PrOH also maximized at 3 h, remained the same until 5 h, and presented a slight decline during 6-8 h. This decline in activity might be probably due to the fact that the catalyst suffers slow deactivation during the reaction due to carbon deposition. A similar finding was reported in our previous studies [8,35].…”

“…Glycerol hydrogenolysis is a complex reaction (Scheme 2) and is generally believed to proceed via dehydration-hydrogenation route in two distinct pathways, which involve the formation of intermediates (acetol and 3-hydroxypropanaldehyde (3-HPA)) by acid-catalyzed dehydration and subsequent formation of propanediols (1,2-PDO and 1,3-PDO) over metal sites [35][36][37][38][39]. Thereafter, C-O hydrogenolysis of 1,2-PDO results in the formation of 1-propanol (1-PrOH), while C-O hydrogenolysis of 1,3-PDO gives rise to 2-propanol (2-PrOH).…”

Nanostructured Metal Catalysts for Selective Hydrogenation and Oxidation of Cellulosic Biomass to Chemicals

“…Controlling WO 3 density on catalyst surface by obtaining highly dispersed polytungstate species is also important in producing more Bronsted acid sites . The addition of Cu restrains C−C cleavage but promotes C−O cleavage reactions on Pt catalyst surface, therefore 1,3‐PDO selectivity (X: 90 %, S: 58.5 %) can be improved on bimetallic PtCu catalysts …”

Catalytic glycerol hydrogenolysis to 1,3-propanediol in a gas–solid fluidized bed

“…The maximum 1,3-PDO selectivity was 58.5%. 20,21 Selectivity of 1,3-PDO reached 32% with Pt/WO 3 /ZrO 2 at 130 C and 40 bar 16 but the highest selectivity to date was 66% (Table 1) with a Pt/WO 3 / AlOOH catalyst. 22 Recent studies show that acrolein in an aqueous solution reacts to form 3-hydroxypropanal in a yield of 20%.…”