Abstract In this study, nano-sized tungsten carbide (2.8 nm) particles with enhanced properties were successfully synthesized using removable ceramic coating method and then applied as dispersed catalysts to hydrocracking of vacuum residue, which was carried out at 673 K for 4 h with initial hydrogen pressure of 70 bar. The nano-sized particles were then characterized with XRD, TEM, and BET analysis. The temperature programmed desorption analysis results showed that nano-sized tungsten particles are capable of superior hydrogen adsorption (compared to bulk tungsten carbide) as well as high catalytic performance not only in commercial liquid yield (Naphtha, middle distillate, and gas oil; 46.7 wt%) but also in coke formation (5.9 wt%). Finally, the characterization and performance correlation of the nano-sized tungsten carbide catalyst were analyzed.

中文翻译：

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纳米分散碳化钨催化剂减压渣油加氢裂化

摘要 本研究采用可去除陶瓷涂层法成功合成了性能增强的纳米碳化钨 (2.8 nm) 颗粒，然后作为分散催化剂应用于减压渣油的加氢裂化，在 673 K 下进行 4 h，初始氢气压力为 70 巴。然后用 XRD、TEM 和 BET 分析表征纳米尺寸的颗粒。程序升温脱附分析结果表明，纳米钨颗粒不仅在商业液体收率（石脑油、中间馏分油和瓦斯油；46.7 wt %) 但也有焦炭形成 (5.9 wt%)。最后，