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| 基于发动机台架的三效催化剂储氧性能分析 |
| A study on oxygen storage performance of three-way catalysts based on engine bench tests |
| Received:August 11, 2023 |
| DOI： |
| 中文关键词: 三效催化剂 储氧能力 催化剂入口温度 气体流量 空燃比窗口 热老化 |
| 英文关键词: three-way catalyst oxygen storage capacity catalyst inlet temperature gas flow rate air-fuel ratio window thermal aging |
| 基金项目:云南省重大科技专项(202102AB080007) |
| Author Name | Affiliation | | XU Ning | State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinumMetals Catalysts Co.Ltd., Kunming 650106, China
State Key Laboratory of Advanced Technologies for ComprehensiveUtilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China | | XIA Wenzheng | State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinumMetals Catalysts Co.Ltd., Kunming 650106, China
State Key Laboratory of Advanced Technologies for ComprehensiveUtilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China | | QIN Qinggao | State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinumMetals Catalysts Co.Ltd., Kunming 650106, China | | LU Bing | State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinumMetals Catalysts Co.Ltd., Kunming 650106, China | | LIAO Wenhan | State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinumMetals Catalysts Co.Ltd., Kunming 650106, China | | YANG Dongxia | State-Local Joint Engineering Laboratory of Precious Metal Catalytic Technology and Application, Kunming Sino-platinumMetals Catalysts Co.Ltd., Kunming 650106, China
State Key Laboratory of Advanced Technologies for ComprehensiveUtilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China |
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| 中文摘要: |
| 通过汽油机台架试验平台，研究了温度、气体流量、空燃比调变窗口、不同劣化程度对OSC的影响。结果表明，提高温度可以提升催化剂的化学反应速率，进而提升OSC的性能；增加气体流量会增加化学反应空速，缩短废气在催化剂孔道内的反应滞留时间，进而抑制OSC性能；增大空燃比调变窗口会导致气体污染物浓度增大，有利于提升催化剂活性组分与储氧材料的化学反应速率，进而提升OSC性能；变温变流量下，提高温度会提升OSC性能，但增大气体流量又会抑制OSC性能，故变温变流量下新鲜催化剂OSC随温度上升幅度相比恒流变温相对平缓；热老化温度和时长决定了催化剂的活性状态，催化剂活性会随着老化温度提高和时间增长明显降低。 |
| 英文摘要: |
| The effects of temperature, gas flow rate, air-fuel ratio and different degrees of deterioration on the oxygen storage capacity (OSC) of three-way catalysts were investigated on a gasoline engine bench testing platform. The results show that increasing the temperature can accelerate the chemical reaction, thereby improving OSC, while increasing the gas flow rate will elevate the space velocity of the reaction and shorten the residence time of the exhaust gases within the catalyst pores, lowering OSC. Expansion of the air-fuel ratio window leads to an increase in the concentration of gas pollutants, which is beneficial to the chemical reaction between the active components of the catalyst and the oxygen storage material, as a result an improved OSC has been realized. Under the conditions of variable temperatures and flow rates, OSC will be improved by increasing the temperature, but increasing the gas flow rate will suppress OSC, consequently OSC rises more smoothly for a fresh catalyst, compared with the situation at a constant flow rate and temperature. The active states of the catalyst are determined by thermal aging temperature and time, and the catalytic activity will deteriorate significantly with the increase of aging temperature and time. |
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