Study of catalyst bed composition for the direct synthesis of dimethyl ether from CO2-rich syngas

Kinetics of the direct DME synthesis from CO2 rich syngas under variation of the CZA-to-γ-Al2O3 ratio of a mixed catalyst bed

“…[50][51][52] Furthermore, the setup of reaction conditions have also shown to be a key factor. 24 While the study of the catalysts properties was out of the scope of this work, a wide range of conditions was covered during the experimental program. The improvement observed by increasing the CZA-to-g-Al 2 O 3 ratio reveals that the number of required acid sites has already been signicantly exceeded when equivalent catalysts masses are used.…”

“…With regard to the composition of the catalyst bed, previous investigations 14, [20][21][22][23] have shown on the basis of simulated and experimental data that optimization can lead to signicant enhancement of the process performance. For instance, in the studies of Peláez et al 15 and Peinado et al 24 the authors showed that for CO 2 rich synthesis gas a signicant increase in the performance is achieved by increasing the CZA-to-g-Al 2 O 3 ratio. In a previous study, 21 applying a dynamic optimization scheme and experimental validation we showed that these effects hold true also for high pressure (50 bar) and different compositions of CO 2 rich syngas, including a hydrogen-lean feed.…”

Direct catalytic production of dimethyl ether from CO and CO2: A review

“…Nevertheless, the results show the positive effect of in-situ water removal for direct synthesis of DME from syngas and pave the way for the development of strategies to maintain H2O removal operations during DME synthesis. [151]. WO3 supported on γ-Al2O3 were investigated for the dehydration of methanol to DME at 230 °C in a fixed bed flow type reactor at atmospheric pressure using nitrogen or air as a carrier gas by Said et al [152].…”

Use of a Reforming Catalyst for Hydrogen Production in the Carbonization Process of Torrefied Biomass

“…Some other compounds were also found at trace levels, mainly methyl-phenol isomers and pyridine in the experiments without catalyst and 3-methyl-phenol and 2,6-dimethoxy-phenol in the catalytic experiments. On the other hand, a great quantity of gases is obtained with a significant percentage of H 2 and, in general, with an attractive composition to be used as fuel or for certain chemical syntheses, mainly dimethyl-ether (DME) [35]. The results obtained for the liquid and gas phases are better than the usual ones in carbonization processes.…”

“…Additionally, taking into account that the support of the employed catalyst contains both acid and base properties (see Table 3, a dual behavior related to this nature is somehow expected. On the one hand, the efficient catalytic activity related to acid catalysts (cracking, aromatization, deoxygenation [34]) and, on the other hand, that related to CaO (the elimination of sugar-like compounds [35]). It must be said that although acidity may be a negative property for classical reforming reactions, it is a desired property in the particular chemical environment of this application.…”