关于用于高效氧化挥发性有机化合物的耐硫Pd基催化剂的研究
Xiaojing Sun1, Jiaqi Li2, Jiayu Fan1
1School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.
Journal of hazardous materials
|March 22, 2025
概括
这项研究开发了一种耐硫-合金催化剂 (Pd-Mo/Al2O3),用于高效的挥发性有机化合物 (VOC) 氧化. 催化剂在硫化 (H2S) 存在时表现出极好的稳定性和活性,这对工业应用至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 环境化学环境化学
背景情况:
- 耐硫催化剂对于挥发性有机化合物 (VOC) 的有效氧化至关重要.
- 基于的催化剂经常遭受硫中毒,限制了它们的长期应用.
- 双金属合金系统提供了一种提高催化剂稳定性和性能的策略.
研究的目的:
- 设计和研究- (Pd-Mo) 双金属合金催化剂的耐硫稳定性,用于乙氧化.
- 阐明Pd-Mo催化剂中硫中毒和抗性的机制.
- 为了最大限度地优化催化剂成分,以获得最大的硫阻力和催化活性.
主要方法:
- 合成和Pd-Mo/Al2O3催化剂的表征.
- 在H2S在500°C的存在下对乙氧化的催化性能的评估.
- 使用X射线光电谱 (XPS),SO2-温度编程吸附 (SO2-TPD) 和密度函数理论 (DFT) 计算,对硫中毒和耐药性机制的研究.
主要成果:
- 在500°C下,Pd-Mo/Al2O3催化剂在160小时内保持了接近100%的乙转化,显示出出色的抗硫性.
- 与Pd相比,Pd-Mo合金表现出较低的SO2脱吸能量,抑制了硫酸盐的形成.
- 当Pd0/(Pd0+Pd2+) 的比率约为50%时,可以达到最佳的硫耐性和乙氧化活性.
结论:
- 在催化剂中引入Mo显著提高了对VOC氧化的抗硫性和催化稳定性.
- Pd-Mo合金可以更容易地去除SO2,防止催化剂失活.
- 这项研究为开发用于环境应用的实用,耐硫催化剂提供了关键的见解.
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