Reliable, environmentally friendly method for the recycling of spent Ag/α-Al2O3 catalysts using (NH4)2Ce(NO3)6

Xulong Dong; Jian Li; Qinggui Xiao; Hui Zhang; Tao Qi

doi:10.1016/j.cjche.2018.04.018

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Reliable, environmentally friendly method for the recycling of spent Ag/α-Al₂O₃ catalysts using (NH₄)₂Ce(NO₃)₆

Energy, Resources and Environmental Technology | Updated：2026-01-06

- Reliable, environmentally friendly method for the recycling of spent Ag/α-Al₂O₃ catalysts using (NH₄)₂Ce(NO₃)₆
- Chinese Journal of Chemical Engineering Vol. 26, Issue 10, Pages: 2169-2175(2018)
- Affiliations：
  
  1. 2 National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process, Chinese Academy of Sciences,Beijing,China,100190
  2. 3 Key Laboratory of Green Process and Engineering, Institute of Process, Chinese Academy of Sciences,Beijing,China,100190
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2018.04.018
  CLC：
- Published：2018
- Accepted：
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DOI：

O DOI： 10.1016/j.cjche.2018.04.018.

摘要

Abstract

Traditionally

Ag-containing solid wastes are leached by nitric acid in order to recycle the noble metal. However

the huge amounts of emission of toxic nitrogen oxides demand the development of a new method for silver recycling. Recently

considering the Ce(IV) solution could be regenerated with electrolyzation method

our group invented a novel environmentally friendly process by using Ce(IV) as the oxidant to dissolve silver from the spent Ag/α-Al

catalysts without NO

emission. To find out the optimal parameters

in this work

the leaching reaction was thoroughly investigated with respect to the temperature

oxidant and HNO

concentrations

stirring speed

and time. The optimized leaching reaction gave the leaching silver rate 99.8% in 1 h. The kinetic plots suggested a shrinking core model with the internal diffusion-controlled process and the activation energy of 38.83 kJ·mol

-1

. The order in which the experimental conditions influence the reaction was determined through orthogonal analysis:temperature oxidant concentration HNO

concentration stirring speed.

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