Deactivation of WNiPd/TiO₂Al₂O₃ catalyst during the upgrading of LCO

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• 作者：Roberto Galiasso Tailleur
• 关键词：Hydrotreating ; LCO hydrogenation ; Lewis acid sites ; Coke ; NO_x and PM emissions
• 刊名：Fuel
• 出版年：2008
• 期刊代码：33_00162361
• 类别：ce
• 出版时间：September 2008
• 卷：87
• 期：12
• 页码：2551-2562
• 文件大小：416 K

摘要

The deactivation of a novel catalyst during the production of a high-quality low-emission diesel component has been studied experimentally in a hydrotreating microplant. This process is compared with a commercial operation that used a conventional HDT catalyst. Catalysts were tested by incrementing temperature as a function of cycle length to keep the sulfur constant in the product, maintaining all other operating conditions constant. Spent catalysts were characterized using solid ¹³CNMR and XPS spectroscopy, pyridine adsorption, GC–MS of the coke extracted, and chemical analysis. Effective pore diffusivity was measured with pentane, and the catalyst activity and selectivity were measured with LCO and probe molecules to verify naphthenic ring opening capability. An important decline in hydrogenation and ring opening activity was detected along the cycle length due to acid site deactivation. The deactivation is attributed to LCO poly-aromatics adsorption on a particular type of acid site. A commercially deactivated HDT catalyst that operated with LCO presents a similar type of coke to that of the pilot plant.