Microwave sodium roasting (MWSR) spent HDS catalysts for recovery Mo and in situ sulfur fixation
Microwave sodium roasting (MWSR) spent HDS catalysts for recovery Mo and in situ sulfur fixation
复制标题
微波钠焙烧 (MWSR) 废 HDS 催化剂用于回收钼和原位固硫
DOI：
10.1016/j.jtice.2019.01.009
复制
发表时间：
2019-04-01
影响因子：
5.7
通讯作者：
Wang, Chen
中科院分区：
文献类型：
--
作者：
Ye, Xiaolei;Guo, Shenghui;Wang, Chen
The heat pretreatment of the spent hydrodesulfurization (HDS) catalysts plays an important role in its comprehensive recycling. In this work, the microwave sodium roasting (MWSR) strategy was used for the heat treatment of the spent catalyst, with the aim of achieving effective separation of Mo and Al while achieving in-situ sulfur fixation. Specifically, the de-oiled, spent HDS catalyst was roasted with Na2CO3 by microwave heating in air, followed by hot water leaching. Based on the thermodynamic analysis, the effects of microwave heating temperature, holding time and Na2CO3 addition on the recovery of molybdenum have been thoroughly investigated. Owing to the special heating method of microwave, the spent catalyst after roasting has a microstructure suitable for leaching, and S is more in situ converted to Na2CO3. After following the strategy, the leaching degree of Mo can reach 99%, while the leaching degree of Al is less than 8%, which indicates that Mo and Al are effectively separated. More importantly, a sulfur fixation degree of 79.1% was obtained. This strategy provides a novel reference for the harmless treatment of spent HDS catalysts. (C) 2019 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
