Reactive Adsorption Desulfurization of Hydrotreated Diesel over a Ni/ZnO鈥揂l2O3鈥揝iO2 Adsorbent

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• 作者：Feng Ju ; Changjun Liu ; Chun Meng ; Shuai Gao ; Hao Ling
• 刊名：Energy & Fuels
• 出版年：2015
• 出版时间：September 17, 2015
• 年：2015
• 卷：29
• 期：9
• 页码：6057-6067
• 全文大小：754K
• ISSN：1520-5029

文摘

A high-performance Ni/ZnO鈥揂l₂O₃鈥揝iO₂ adsorbent was developed for reactive adsorption desulfurization (RADS) of diesel. The desulfurization performance of the prepared adsorbents was evaluated in a fixed-bed reactor for treating a hydrotreated diesel with a sulfur content of 1187 ppm. The preparation conditions were investigated, such as aging time, aging temperature, metallic ion concentration, and precipitation temperature. Results showed that the adsorbents performed at a high desulfurization efficiency under the mild preparation conditions. This indicated that smaller crystalline grains were favorable for desulfurization over the Ni/ZnO鈥揂l₂O₃鈥揝iO₂ adsorbent. The adsorbent attained a high adsorption ability of 38.4 mg/g at a breakthrough sulfur level of 20 ppm. The mechanism of deactivation of the adsorbent was also studied and discussed by various characterizations, such as N₂ physisorption, powder X-ray diffraction (XRD), ammonia temperature-programmed desorption (NH₃鈥揟PD), transmission electron microscopy (TEM), and scanning electron microscopy/energy-dispersive spectrometry (SEM/EDS). The main reasons of the deactivation of the RADS adsorbent include the carbon deposition, the formation of ZnS, and the sintering of the active and support.