Pt纳米粒子尺寸对Pt/Al2O3催化氧化甲苯及乙酸乙酯性能的影响

施国忠; 韦小丽; 冯向东; 查芳柯; 余一凡; 皮志超; 吴贤豪; 卢晗锋

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中国环境科学 ›› 2026, Vol. 46 ›› Issue (2) : 689-697.

大气污染与控制

Pt纳米粒子尺寸对Pt/Al₂O₃催化氧化甲苯及乙酸乙酯性能的影响

施国忠¹, 韦小丽², 冯向东¹, 查芳柯², 余一凡¹, 皮志超², 吴贤豪¹, 卢晗锋²

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Size effect of Pt nanoparticles over Pt/Al₂O₃ on catalytic oxidation of toluene and ethyl acetate

SHI Guo-zhong¹, WEI Xiao-li², FENG Xiang-dong¹, ZHA Fang-ke², YU Yi-fan¹, PI Zhi-chao², WU Xian-hao¹, LU Han-feng²

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摘要

Pt纳米粒子尺寸对Pt基负载型催化剂用于处理催化挥发性有机化合物降解性能具有重要影响.通过液相还原法成功制备出尺寸均一的Pt纳米粒子(6,10,18nm),并采用原位沉积法将其负载到Al₂O₃载体上.结果表明,制备的系列Pt/Al₂O₃催化剂的织构性质、形貌、Pt纳米粒子分散性等性质均保持近似.甲苯和乙酸乙酯的催化燃烧性能均随着Pt纳米粒子尺寸的降低而增强.随着Pt纳米粒子尺寸的降低(18nm vs 6nm),Pt与Al₂O₃的相互作用增强,部分电子由Pt转移至载体上,增加了Pt²⁺含量(13% vs 36%),同时增加了载体活性吸附氧物种的含量(32% vs 80%),二者的协同作用增强了Pt/Al₂O₃催化剂的氧化还原性能,进而促进了甲苯(216^oC vs 178^oC)和乙酸乙酯(312^oC vs 258^oC)的降解性能.

Abstract

The size of Pt nanoparticles exerts a significant influence on the catalytic degradation performance of Pt-based supported catalysts for the treatment of volatile organic compounds (VOCs, volatile organic chemicals). Herein, uniform Pt nanoparticles were successfully fabricated via liquid phase reduction method and followed deposited on Al₂O₃ through in-situ growth method. It had to noted that the loaded Pt nanoparticles with different sizes had no effect on the textural properties, morphologies and the dispersion of Pt species, etc. The conversion activity of toluene and ethyl acetate were increased with the decline of Pt nanoparticles size. It could be explained by the enhanced interaction between Pt and Al₂O₃ with the decreased Pt size (18nm vs 6nm). Partial electrons could be transformed from Pt to Al₂O₃ to improve the contents of Pt²⁺(13% vs 36%), in the meantime, the amounts of active oxygen species (O_ads) also increased (32% vs 80%). Fortunately, the synergistic effect between Pt²⁺ and O_ads boosted the redox of Pt/Al₂O₃ as well as the catalytic performance of toluene (216^oC vs 178^oC) and ethyl acetate degradation (312^oC vs 258^oC). The results will provide theoretical direction for the design of highly active supported Pt-based catalysts.

导出引用

施国忠, 韦小丽, 冯向东, 查芳柯, 余一凡, 皮志超, 吴贤豪, 卢晗锋. Pt纳米粒子尺寸对Pt/Al₂O₃催化氧化甲苯及乙酸乙酯性能的影响[J]. 中国环境科学. 2026, 46(2): 689-697

SHI Guo-zhong, WEI Xiao-li, FENG Xiang-dong, ZHA Fang-ke, YU Yi-fan, PI Zhi-chao, WU Xian-hao, LU Han-feng. Size effect of Pt nanoparticles over Pt/Al₂O₃ on catalytic oxidation of toluene and ethyl acetate[J]. China Environmental Science. 2026, 46(2): 689-697

中图分类号： X511

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