![]() This conversion of CO 2 in the overall process of DME synthesis is favored by the reverse water gas shift equation, since CO is more active than CO 2 in the methanol synthesis reaction.ĭimethyl ether (DME) is receiving increasing attention as alternative fuel and raw material. Ratios below 1/3 are suitable for enhancing DME production, whereas CO 2/CO ratios above 1 improve the conversion of CO 2. CO 2/CO molar ratio in the feed is of great importance. ![]() The optimums of these two objectives are achieved in opposite conditions, and for striking a good balance between both objectives, the following conditions are suitable: 275–300 ☌ 20–30 bar 2.5–5 g cat h (mol C) −1 and a H 2/CO x molar ratio in the feed of 3. ![]() The effect of the reaction conditions (temperature, pressure, space time) and feed composition (ternary mixtures of H 2 + CO + CO 2 with different CO 2/CO and H 2/CO x molar ratios) on the reaction indices (CO x conversion, product yield and selectivity, CO 2 conversion) has been studied by means of experiments carried out in a fixed-bed reactor, with a CuO-ZnO-MnO/SAPO-18 catalyst, in order to establish suitable ranges of operating conditions for enhancing the individual objectives of CO 2 conversion and DME yield. The direct synthesis of dimethyl ether (DME) is an ideal process to achieve the environmental objective of CO 2 conversion together with the economic objective of DME production.
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