Dearsenization of nickel-based catalysts: Thermal behaviour of nickel arsenide in oxygen and in air

被引：0
|
作者：
Pommier, Stephane [1 ]
Valette, Stephane [1 ]
Lefort, Pierre [1 ]
机构：
[1] Univ Limoges, European Ceram Ctr, SPCTS, UMR CNRS 7315, F-87068 Limoges, France
来源：
CORROSION SCIENCE | 2014年 / 89卷
关键词：
Ceramic; Weight loss; X-ray diffraction; SEM; Hot corrosion; Kinetic parameters; Oxidation; HIGH-TEMPERATURE OXIDATION; CRYSTAL-STRUCTURE;
D O I：
10.1016/j.corsci.2014.08.019
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The arsenic present in the spent Ni-catalysts of petroleum industries is supposed to form arsenides. It must be removed for the catalysts regeneration or for recycling nickel. In air or Ar/O-2, a partial dearsenization of Ni11As8 occurs, giving Ni5As2, between 580 and 650 degrees C. Ni5As2 forms AsO(g) and a NiO layer that blocks the arsenic elimination (passivation layer). The reaction mechanism is complex, dearsenization being governed by the surface oxidation of arsenic, and oxidation being rate-limited by the Ni outward diffusion. This work shows that the industrial process of regeneration does not eliminate arsenides, but only the physisorbed arsenic. (C) 2014 Elsevier Ltd. All rights reserved.
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收藏
页码：171 / 178
页数：8
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