Israel Pala Rosas, Jose Luis Contreras Larios , Beatriz Zeifert and José Salmones Blásquez (April 11th 2019). Further work of Lago et al.
Figure 5 presents the influence of temperature on the glycerol conversion and acrolein yield for the gas-phase reaction over catalysts of 20 wt % of phosphomolybdic acid (H3PMo12O40, HPMo), phosphotungstic acid (H3PW12O40, HPW), and silicotungstic acid (H4SiW12O40, HSiW) supported on commercial alumina (Al2O3, A5) in a fixed-bed reactor [28]. Attempts to produce acrolein by dehydration of glycerol in the gas phase could be traced a long time ago. [32] reported the use of the parent (Si/Al = 15) and desilicated H-ZSM-5 zeolite attaining a glycerol conversion of 62.1% and acrolein yield of 30.6% for the former at 548 K and 1 h of TOS, while the modified zeolite reached 89.6% of glycerol conversion and 72.1% of acrolein yield. According to Tsukuda et al. Effect of the water content in the feedstock on the glycerol conversion and the acrolein yield with time-on-stream. and you may need to create a new Wiley Online Library account.
Table 4 summarizes some relevant catalysts used in the gas-phase conversion of glycerine to acrolein, as well as the reaction conditions and their catalytic performance. Additionally, the modified catalyst showed lower deactivation at 7 h of TOS than the H-β zeolite. Above 548 K, the acrolein yield declined because the decomposition reaction toward acetaldehyde and formaldehyde is favored at high temperatures; however, the temperature at which this reaction begins to be prominent also depends on the acidity of the catalyst employed, varying from 548 to 598 K. Effect of the reaction temperature on (a) the glycerol conversion and (b) the acrolein yield. A thermodynamic study of the equilibrium has been made to estimate the conversion to equilibrium as a function of temperature. Care should be taken concerning the choice of the reference conditions, since the three ways of expressing space velocity find extensive use. Viswanadham et al. The glycerol conversion increased from 90–94% with increasing WHSV from 0.17 to 0.35 h−1. Tests of catalyst lifetime indicated that the solid was stable with high acrolein selectivity up to 10 h on TOS. The catalytic activity depended on the amount of heteropolyacid supported, the calcination temperature, and the reaction temperature. The highest conversions were 61.6, 84.1, and 93% in the order HY, LaY, and Pd/LaY at 573 K. For the three catalysts, the acrolein selectivities increased with the increase in temperature and also followed the trend LaY > HY > Pd/LaY, regarding the composition.
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