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本文研究了铈助剂在低碳混合醇合成中的作用。发现,在Cu-Zn-Al-K催化剂中,以铈取代部分铝,可抑制钾的副作用,延长催化剂的使用寿命,提高高级醇的选择性。同时还发现含铈催化剂表面有纤维网络存在;反应后催化剂中CeO_2特征衍射峰消失,有新的未辨明的物相生成。认为:由大量细小的纤维组成的纤维网络可以对催化剂的结构起稳定作用,有利于热的传递;在反应过程中由于CeO_2部分还原,促进了铈与铜之间的重新分散,加强了二者间的相互作用,抑制铜晶烧结,从而提高了催化剂的热稳定性。另外,铈的存在,可以使钾稳定分散在催化剂表面,有利于高级醇的生成。
This paper studies the role of cerium additives in the synthesis of low-carbon mixed alcohols. It was found that substituting some aluminum with cerium in Cu-Zn-Al-K catalyst can inhibit the side effects of potassium, extend the service life of the catalyst and improve the selectivity of higher alcohols. At the same time, it is also found that the surface of the cerium-containing catalyst has a fiber network. After the reaction, the characteristic diffraction peak of the CeO 2 disappears and a new unidentified phase is formed. It is concluded that the fiber network composed of a large number of fine fibers can stabilize the structure of the catalyst and facilitate the heat transfer. Due to the partial reduction of CeO 2 during the reaction, the redispersion of cerium and copper is promoted, and the two are strengthened Between the interaction, inhibition of copper crystallization, thereby enhancing the thermal stability of the catalyst. In addition, the presence of cerium, potassium can be stably dispersed on the catalyst surface, is conducive to the formation of higher alcohols.