Gas-phase dehydration of glycerol over thermally-stable SAPO-40 catalyst

Abstract

SAPO-40 was used as catalyst for the gas-phase dehydration of glycerol towards acrolein. At 350 ºC the catalyst attained full conversion of glycerol with a negligible deactivation in the first 48 h, a glycerol conversion above 50 % after 120 h on stream and a nearly constant selectivity to acrolein above 70%. This catalyst proved to be highly resistant under the experimental conditions used and can be regenerated without loss of activity or significant structural damage. The comparison of SAPO-40 with SAPO-34 and SAPO-11 illustrates the importance of the porous structure and emphasizes the good catalytic performance of this material.

Insight into the gas‐phase glycerol dehydration on transition metal modified aluminium phosphates and zeolites

“…shows, the weight loss (Table ) was accompanied in some solids by two exothermic peaks around 370°C and 510°C, in the differential thermal analysis (DTA) curves. These peaks are due to the combustion of coke on the used catalysts, as has been reported by other authors in the dehydration of glycerol . Furthermore, an endothermic peak also appeared around 115°C, corresponding with the adsorbed water.…”

Porous Silicon-Based Catalysts for the Dehydration of Glycerol to High Value-Added Products

“…Several SAPOs (SAPO-11, SAPO-34, and SAPO-40) were evaluated in glycerol dehydration [ 84 ]. The catalytic results revealed a significant deactivation along the time-of-stream, being more pronounced in the case of SAPO-11 and SAPO-34 ( Table 3 ).…”

“…Regarding the selectivity, SAPOs showed similar acrolein selectivity, about 75%, and the presence of hydroxyacetone and acetaldehyde was also noteworthy (about 10% of selectivity) [ 84 ]. These data are in disagreement with those reported by Suprun et al, where the hydroxyacetone selectivity was higher [ 25 ].…”

“…They reported that SAPO-11 and SAPO-34 catalysts, with small micropores (5–6 Å), were less active but more selective than mesoporous Al 2 O 3 –PO 4 and TiO 2 –PO4. Moreover, a detailed study with SAPO-40 revealed that the use of high reaction temperatures (T > 350 °C) causes a drastic deactivation by the formation of carbonaceous deposits, although the catalyst can be easily regenerated, maintaining its catalytic performance [ 84 , 85 ].…”

Gas-phase conversion of glycerol to allyl alcohol over vanadium-supported zeolite beta

“…Acrolein is mainly used for the production of acrylic acid, acrylic acid esters, superabsorber polymers and detergents [4,5]. A large variety of acid catalysts has been reported for this reaction, including zeolites, heteropolyacids, metal oxides and modified mesoporous silica materials [6][7][8][9][10][11][12][13], with their acid and textural properties playing a crucial role on the catalytic performance [11,[14][15][16]. plasticizers, crosslinking agents and coating additives [17].…”