共查询到18条相似文献,搜索用时 78 毫秒
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分别从预硫化效果、反硫化、工艺条件、床层偏流、开停车等方面分析了导致Co—Mo系耐硫变换催化剂活性降低的原因,结合生产操作运行的实践,指出通过采用较低的入口温度、保持工艺操作参数平稳、避免反硫化的产生等方法来减少该类型催化剂活性降低。 相似文献
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首先介绍了Co-Mo系催化剂的发展历程、性能指标,其次对催化剂装填、升温硫化的工业应用经验和在应用过程中造成失活的原因以及应对措施进行了详细阐述,最后对Co-Mo系变换催化剂的工业应用进行了总结。 相似文献
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介绍了耐硫变换催化剂的硫化原理和硫化方法;论述了催化剂在硫化升温过程中相应注意事项;阐述了影响催化剂硫化效果的各项因素——温度、压力、H2S浓度、水分等对催化剂活性的影响和指标控制范围。 相似文献
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耐硫变换催化剂失活原因综述 总被引:4,自引:1,他引:4
自Co-Mo系耐硫变换催化剂问世以来,人们对其制备工艺、反应机理、动力学等进行了常任主细致的研究。随充变换催化剂的广泛应用,催化剂失活的原因引起了人们的普遍关注。对国内外Co-Mo纱耐硫变换催化剂失活的原因进行了综述。 相似文献
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在精对苯二甲酸的生产中,有多种原因可能导致Pd-C催化剂失活,影响其使用寿命。根据多年的生产经验及有关分析数据,分类分析了催化剂失活的机理和原因,并提出防治措施。 相似文献
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Tantalum (Ta)-added tungsten carbide (WC) (WC+Ta) was examined in order to obtain surperior characteristics in stability and electrocatalytic activity for the oxygen reduction reaction (ORR) in acid electrolyte. The stability and the electrocatalytic activity of the WC+Ta catalyst were electrochemically investigated and compared to the pure WC. It was proved that the stability of the tungsten carbide was significantly increased by the addition of tantalum compared to the pure WC. The enhanced stability might be due to the formation of the W-Ta alloy in the WC+Ta catalyst. The reduction current of the WC+Ta catalyst for the ORR was observed at a potential of 0.8 V (versus dynamin hydrogen eletrode (DHE)) or less noble potential. This value was about 0.35 V higher than that of the pure WC. The enhanced electrocatalytic activity for the ORR might be caused by the presence of tungsten carbide, which exists on the surface and/or sub-surface. 相似文献
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对硫化态钴钼耐硫变换催化剂和采用特殊钝化技术制备的预硫化耐硫变换催化剂在大气中的变化进行研究。考察了与空气接触时间和温度对其催化性能的影响以及模拟工业装填条件下床层温升。结果表明,硫化态钴钼耐硫变换催化剂必须进行氮气条件下包装、运输和装填,而采用特殊钝化技术制备的预硫化耐硫变换催化剂无需氮气保护。 相似文献
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IR characterization and activity measurements of a sulfided Co-Mo/Al2O3 catalyst (3.6% CoO; 14% MoO3) prepared by thermodecomposition of Co(CO)3NO on a sulfided Mo/Al2O3 sample are compared to those of the conventional Co-Mo/Al2O3 industrial catalyst. The ex-carbonyl preparation leads to a higher degree of promotion for the Co-Mo couple, as evidenced by a two-fold increase in HDS activity and by a more intense signal of adsorbed CO on the promoted sites. On the other hand, the hydrogénation activity is not sensitive to the method of preparation. 相似文献