Iron poisoning is a well-known problem for fluid catalytic cracking catalysts. Previously, we have used several characterization techniques, including SEM, TEM and EDX, to examine an iron-poisoned catalyst sample from a commercial unit. The results clearly showed that Fe, as well as some other contaminant metals (such as Ni, Mg and Ca), and Si were enriched on the catalyst particle surface (J. Catal. 2018, 361, 126–134). In this contribution, surface Si enrichment was further studied with many iron-poisoned Ecat samples from different refineries. The data was obtained with SEM-EDX measurements of Ecat particles under different accelerating voltages, coupled with Monte Carlo simulations. Surface Si enrichment was found to correlate well with Fe content in the Ecat samples, confirming that both Fe contaminants and Si accumulation on the catalyst surface need to be considered to better understand iron poisoning mechanism and to design more stable catalysts.

对于流化催化裂化催化剂，铁中毒是众所周知的问题。以前，我们已经使用了几种表征技术，包括SEM，TEM和EDX，来检查来自商业单位的铁中毒催化剂样品。结果清楚地表明，铁，以及一些其他的杂质金属（如Ni，Mg和Ca），和Si富集的催化剂颗粒表面（J. CATAL。 2018，361，126–134）。在这一贡献中，使用来自不同精炼厂的许多铁中毒的Ecat样品进一步研究了表面Si富集。数据是通过在不同加速电压下对Ecat颗粒进行SEM-EDX测量获得的，并结合了Monte Carlo模拟。发现表面硅的富集与Ecat样品中的Fe含量有很好的相关性，这表明需要同时考虑Fe污染物和Si在催化剂表面的积累，以更好地了解铁中毒机理并设计更稳定的催化剂。