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首页> 外文期刊>Journal of industrial and engineering chemistry >Effect of precipitants during the preparation of Cu-ZnO-Al2O3/Zr-ferrierite catalyst on the DME synthesis from syngas
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Effect of precipitants during the preparation of Cu-ZnO-Al2O3/Zr-ferrierite catalyst on the DME synthesis from syngas

机译：Cu-ZnO-Al2O3 / Zr-镁碱沸石催化剂制备过程中的沉淀剂对合成气合成二甲醚的影响

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摘要

The synthesis of dimethyl ether (DME) from biomass-derived model synthesis gas has been investigated on Cu-ZnO-Al2O3/Zr-ferrierite bifunctional catalysts. The catalysts are prepared by co-precipitation-impregnation method using Na2CO3, K2CO3 and (NH4)2CO3 as the precipitants. The catalytic activity tests reveal that the best yield of DME can be obtained on the catalyst precipitated by using (NH4)2CO3. Detailed characterization studies conducted on the catalysts to measure their properties such as surface area, acidity by temperature-programmed desorption of ammonia (NH3-TPD), reducibility of Cu oxide by temperature-programmed reduction (TPR), transmission electron microscope (TEM), X-ray photoelec-tron spectroscopy (XPS) and copper surface area and particle size measurements by N2O titration method. Increasing the number of moderate acidic sites and facilitation of easily reducible copper species with small particle size are found to be the prime reasons for the superior functionality of the (NH4)2CO3 precipitated catalyst. The usage of (NH4)2CO3 also leaves no residual ions, whereas the presence of residual K+ and Na+ ions in the case of K2CO3 and Na2CO3 precipitated catalysts leads to lower activity and selectivity.
机译：在Cu-ZnO-Al2O3 / Zr-镁碱沸石双功能催化剂上研究了由生物质衍生的模型合成气合成二甲醚（DME）的方法。通过共沉淀浸渍法，使用Na 2 CO 3，K 2 CO 3和（NH 4）2 CO 3作为沉淀剂制备催化剂。催化活性测试表明，使用（NH4）2CO3沉淀的催化剂可获得最佳的DME收率。对催化剂进行了详细的表征研究，以测量其性能，例如表面积，通过程序升温氨解吸的酸度（NH3-TPD），通过程序升温还原（TPR）还原的氧化铜，透射电子显微镜（TEM），用N2O滴定法测量X射线光电子能谱（XPS）和铜的表面积和粒径。发现增加中度酸性位点的数量并促进具有小粒径的易于还原的铜物质是（NH4）2CO3沉淀催化剂具有优异功能的主要原因。 （NH 4）2 CO 3的使用也没有残留离子，而在K 2 CO 3和Na 2 CO 3沉淀的催化剂的情况下，残留K +和Na +离子的存在导致活性和选择性降低。

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