Investigating the effect of metal oxide promoters on the properties of CuZnO/γ-Al2O3 catalysts in direct dimethyl ether synthesis from syngas
Abstract
In this paper, the authors present the results collected when adding Mn, Cr, Zr, Ce (1 - 6wt%) to improve catalyst performance for direct dimethyl ether synthesis on a 20%w CuZnO/γ-Al2O3, nCu/nZn = 70/30 catalyst sample. The modifi ed catalyst’s activities were measured to perform the direct synthesis of dimethyl ether (DME) from syngas (H2/CO = 2:1) under low pressure conditions. The results indicated that modifi cation of 20%w CuZnO/γ-Al2O3 catalyst with a suitable adding amount of Zr signifi cantly enhanced the CO conversion (from 47% to 60%) and slightly improved the selectivity for DME from 66% to more than 67%. However, when adding the Mn, Cr, Ce contents from 1% to 5%wt on the studied catalyst, both the conversion of CO and the selectivity for DME were not improved.
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