10-Jul-19
在高温下，一种新的沸石催化剂在丙烯生产中可能具有工业应用，这是由化学技术研究所的研究人员（西班牙国家研究委员会（CSIC）和瓦伦西亚理工大学联合中心）开发的。该研究的结果已获得公司的许可。
Zeolites are crystalline materials with a structure of regular small pores that allow molecules to enter them. Depending on the chemical composition and topology of these structural pores, different chemical reactions can be developed. Avelino Corma, CSIC researcher at the Institute of Chemical Technology, explains that "one of the greatest challenges when synthesizing zeolites consists of locating the active sites within the structure of pores and cavities of different dimensions of its structure. When metals with catalytic properties such as platinum are introduced into a zeolite, they tend to be randomly distributed. Therefore, the selective placement of active sites in a specific type of pore or cavity is a fundamental challenge with important implications for their catalytic application.
The researchers at the Institute of Chemical Technology set themselves a triple challenge: to generate subnanometric metal clusters, which are small groups of a few atoms, within a zeolite; to stabilize them by controlling their reactive properties; and to do everything in a purely siliceous MFI zeolite to avoid the presence of acids in the final material.
“亚纳奈特金属簇在高温以上的高温下烧结的问题。这意味着它们倾向于在块中汇合，这限制了它们的催化施用。这就是为什么我们认为沸石可以作为稳定亚纳米催化剂的理想支持，这就是为什么科尔马解释说。
化学技术研究所的科学家成功地在MFI沸石的正弦通道中找到了高度稳定的亚纳米铂簇。他们已经通过分辨率电子显微镜技术和综合差异相对比成像技术证明了这一点。“我们创建的催化剂表现出非常高的稳定性，选择性和活性，用于丙烷形成丙烯，这是一个具有多种工业应用的过程。不仅如此，我们认为这种稳定策略也可以应用于其他金属和其他金属和其他多孔晶体材料，” Corma总结道。
Researchers from the University of Cadiz and the Synchrotron ALBA have also participated in this work.
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