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The Effects of Secondary Oxides on Copper‐Based Catalysts for Green Methanol Synthesis

机译:仲氧化物对绿色甲醇合成用铜基催化剂的影响

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摘要

Catalysts for methanol synthesis from CO2 and H2 have been produced by two main methods: co‐precipitation and supercritical anti‐solvent (SAS) precipitation. These two methods are compared, along with the behaviour of copper supported on Zn, Mg, Mn, and Ce oxides. Although the SAS method produces initially active material with high Cu specific surface area, they appear to be unstable during reaction losing significant amounts of surface area and hence activity. The CuZn catalysts prepared by co‐precipitation, however, showed much greater thermal and reactive stability than the other materials. There appeared to be the usual near‐linear dependence of activity upon Cu specific area, though the initial performance relationship was different from that post‐reaction, after some loss of surface area. The formation of the malachite precursor, as reported before, is important for good activity and stability, whereas if copper oxides are formed during the synthesis and ageing process, then a detrimental effect on these properties is seen.
机译:由CO2和H2合成甲醇的催化剂主要通过两种方法生产:共沉淀法和超临界反溶剂(SAS)沉淀法。比较了这两种方法,以及负载在Zn,Mg,Mn和Ce氧化物上的铜的行为。尽管SAS方法最初生产的活性材料具有较高的Cu比表面积,但在反应过程中它们似乎不稳定,从而损失了大量的表面积,从而失去了活性。然而,通过共沉淀制备的CuZn催化剂显示出比其他材料更高的热稳定性和反应稳定性。尽管表面性能有所下降,但初始性能关系与反应后的性能关系不同,但似乎似乎存在活性对Cu比表面积的近乎线性关系。如先前报道的,孔雀石前体的形成对于良好的活性和稳定性很重要,而如果在合成和老化过程中形成氧化铜,则可以看到对这些性能的有害影响。

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