加氢脱硫
催化作用
渗氮
噻吩
化学
氢
硫黄
钼
无机化学
氮气
氧气
氮化物
氧化物
程序升温还原
化学工程
有机化学
图层(电子)
工程类
作者
Shuwen Gong,Haokan Chen,Wen Li,Baoqing Li
标识
DOI:10.1016/j.apcata.2004.10.038
摘要
β-Mo2N0.78 catalyst was synthesized via the temperature-programmed reaction between N2–H2 mixture gases and molybdenum oxide. The influences of the synthesis conditions on catalyst structure and catalyst hydrodesulfurization (HDS) behavior were also studied. H2-TPR experiment was used to investigate the structure changes of catalyst before and after HDS reaction. Preparation results showed that β-Mo2N0.78 can be formed at a final nitriding temperature of 923–1023 K and N2/H2 ratios of 1/4–1/1. The formation of MoO2 intermediate results in the low surface area β-Mo2N0.78 product. The thiophene HDS result indicated that β-Mo2N0.78 also has HDS catalytic activity. Its bulk structure is retained after HDS reaction although sulfur replaces the surface oxygen as determined by TPR examination. Pre-reduction does not improve the HDS activity of passivated β-Mo2N0.78 although hydrogen reduction can remove the oxygen from surfaces. The catalytic activity of passivated nitride decreases with the increasing of final nitriding temperature from 923 to 1123 K, and there is a suitable N2–H2 ratio to prepare high activity β-Mo2N0.78 catalyst.
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