聚乙二醇液相还原法制备高性能低温脱硝催化剂
Preparation of high-performance low-temperature denitration catalysts by polyethylene glycol liquid-phase reduction method
以硼氢化钠、甲醛、水合肼和聚乙二醇为还原剂,采用液相还原法制备了不同Pd/Al2O3催化剂,考察了催化剂的氢气选择性催化还原脱硝性能。结果显示聚乙二醇还原剂制备的催化剂展现出最佳的低温脱硝性能,其在首次脱硝和二次循环脱硝中均表现出90%以上的NOx转化率和N2选择性。催化剂表征结果表明,聚乙二醇还原剂使催化剂表面上的活性Pd0和吸附氧物种最多,比表面积最大,显著促进了NO的吸附活化和H2的稳定解离,因而使催化剂的低温活性、N2选择性和热稳定性最佳。
Pd/Al2O3 catalysts were prepared by a liquid-phase reduction method using sodium borohydride,formaldehyde,hydrazine hydrate,and polyethylene glycol,respectively.The selective catalytic reduction performance results showed that the Pd/Al2O3 catalyst reduced by polyethylene glycol had the best low-temperature performance,showing over 90% NOx conversion and N2 selectivity in both the first and the second denitrification tests.Catalysts characterization results demonstrated that on the Pd/Al2O3 catalyst reduced by polyethylene glycol,the amount of active Pd0 and adsorbed oxygen species were the highest,and the specific surface area was the largest.Thus,the NO adsorption and activation and the stable H2 dissociation were significantly enhanced,leading to the excellent low-temperature activity,N2 selectivity and stability.
H2-SCR / Pd/Al2O3 / Pd0物种 / 吸附氧物种 / 聚乙二醇还原
H2-SCR / Pd/Al2O3 / Pd0 species / adsorbed oxygen species / PEG reduction
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国家自然科学基金项目(22266036)
云南省基础研究计划面上项目(202501AT070443)
云南民族大学硕士研究生科研创新基金项目(2025SKY040)
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