Reactive Characteristics and Adsorption Heat of Ni/ZnO–SiO2–Al2O3 Adsorbent by Reactive Adsorption Desulfurization

Ind. Eng. Chem. Res., 2011, 50 (22), pp 12449–12459

Reactive Characteristics and Adsorption Heat of Ni/ZnO–SiO2–Al2O3 Adsorbent by Reactive Adsorption Desulfurization

Gang Wang*, Yaoshun Wen, Jingxin Fan, Chunming Xu, and Jinsen Gao*

wanggang@cup.edu.cn

jsgao@cup.edu.cn

State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China

Abstract

Reactive adsorption desulfurization (RADS) experiments of fluid catalytic cracking (FCC) gasoline and a model gasoline over an Ni/ZnO–SiO2–Al2O3 adsorbent were carried out in a fixed-fluidized bed reactor at low pressures in an H2 atmosphere.

Results demonstrate that hydrogenation, hydrogen transfer, and polymerization reactions accompany RADS. Sulfidation and carbon deposits are critical to the decay of desulfurization and the olefin-hydrogenation capability of the adsorbents. The obvious reduction of C5 and C6 olefins in FCC gasoline mainly contribute to the drop in octane number of the desulfurization product. The desulfurization experiment on model gasoline and the adsorption heats of model compounds show that RADS removes sulfur from sulfur-containing compound through S–M interactions rather than by π-complexation over the Ni/ZnO–SiO2–Al2O3 adsorbent.

[EXCERPT]

The desulfurization experiment on model gasoline and the adsorption heats of model compounds show that RADS removes sulfur from sulfur-containing compound through S–M interactions rather than by π-complexation over the Ni/ZnO–SiO 2 –Al 2 O 3 adsorbent. ...

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