Mn/ Re/Cu体系催化剂催化甲醇一步合成二甲氧基甲烷的研究

One-step synthesize of dimethoxymethane from methanol over Mn/Re/Cu catalysts

摘要: 以ReO_x/CuO为催化剂，将甲醇选择性氧化一步合成二甲氧基甲烷（DMM）。考察了不同催化剂、反应温度以及Mn作为助剂对反应的影响。并利用XRD、程序升温脱附(NH₃-TPD)和程序升温还原(H₂-TPR)等手段对该催化剂进行了表征。结果表明，在一定的温度范围内，较高的反应温度有利于提高甲醇的转化率和DMM选择性；少量的Mn（2%）作为结构型助剂加入催化剂，通过改善催化剂表面分散度以及酸碱性，可以提高甲醇的转化率以及DMM的选择性；在非临氧条件下，催化剂表面的晶格氧可以参与反应，将甲醇氧化并最终得到DMM。

Abstract: The synthesis of dimethoxymethane (DMM) by selective oxidization of methanol over CuO supported rhenium oxide and manganses oxide as catalyst in a fix-bed reactor was studied. Combining with the characterization of XRD, H₂-TPR and NH₃-TPD, it was found that higher temperature may promote methanol conversion and the selectivity of DMM. With addition of manganese as structural promoter, the methanol conversion and the selectivity of DMM were improved. The catalyst could oxidize methanol to DMM by its lattice oxygen atoms without O₂.