Journal of The Japan Petroleum Institute
Print ISSN : 0582-4664
Ultra-deep Hydrodesulfurization of Kerosene for Fuel Cell System (Part 2)
Regeneration of Sulfur-poisoned Nickel Catalyst in Hydrogen and Finding of Auto-regenerative Nickel Catalyst
Kinya TAWARATakeshi NISHIMURAHikoichi IWANAMI
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JOURNAL FREE ACCESS

2000 Volume 43 Issue 2 Pages 114-120

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Abstract

An idea to regenerate sulfur-poisoned Ni catalyst in flowing H2 was tried. That is, sulfur-poisoned Ni catalyst particles are mixed with ZnO fine particles in a H2 atmosphere at 600K, then the each poisoned catalyst particle would releases a few ppb of H2S through the H2 atmosphere and the released H2S would be accepted on neighboring ZnO particles. Then, a million-fold effective improvement in the regeneration of sulfur-poisoned Ni catalyst in a flow of H2 would be realized. After only a 90h of trial operation, sulfur-poisoned 60% Ni/Al2O3 catalyst was regenerated. Applying this idea, 12.3% Ni/ZnO was prepared and tested as a model catalyst for adsorptive ultra-deep hydrodesulfurization (UD-HDS) of kerosene in a stream of H2 containing 25% CO2 at 600K. Residual sulfur in the treated kerosene was not detectable (<0.06 wt ppm) by the ready-made sensitive sulfur analyzer even after 800h of operation. Comparing with the conventional Ni/Al2O3 catalyst, the Ni/ZnO catalyst did not produce any CH4. The ZnO support is regarded to serve as a kind of SMSI and to regenerate Ni catalyst automatically in the HDS. To the best of our knowledge, this is the first time that the regeneration of the sulfur-poisoned Ni catalyst in a H2 stream was realized and the automatic regenerative Ni catalyst for adsorptive HDS was demonstrated. Other materials for the catalyst of adsorptive UD-HDS were investigated. Al2O3 and Fe2O3 were useful as sub-materials, however, Cu, Co, Mo, Pd, and Pt were not comparable to Ni and ZnO.

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