乙烯气体深度脱氧催化剂性能研究
Study on performance of deep deoxidation catalysts for ethylene gas
李洁 1王磊 1陈耀壮 1赵英 1雷菊梅 1郑珩 1蒲江涛1
作者信息
- 1. 西南化工研究设计院有限公司 工业排放气综合利用国家重点实验室,国家碳一化学工程技术研究中心,四川 成都 610225
- 折叠
摘要
贵金属脱氧催化剂和化学吸附型脱氧催化剂用于乙烯气体脱氧,存在价格昂贵、脱氧容量小和再生频繁等缺点.以稀土氧化物改性的γ-Al2O3为载体,采用浸渍法负载Pd-Ag双金属活性组分,制备了乙烯气体深度脱氧催化剂.考察了催化剂在富含乙烯气体中对氧的深度脱除性能,并通过X射线衍射(XRD)、N2吸/脱附和热重分析等手段对载体及催化剂结构进行了表征.结果表明,稀土改性后载体孔径增大(平均孔径由改性前的1.90 nm增大至改性后的2.50 nm),活性组分具有高分散度和良好的低温脱氧活性,在反应温度为110～180 ℃的条件下,催化剂可将乙烯气体中氧脱至小于1×10-6(O2的体积分数).在空速为5000 h-1,反应温度为145 ℃的条件下,催化剂在1650 h的寿命测试中保持了较高的脱氧活性,且使用前及使用过程中均无需还原再生.
Abstract
Precious metal deoxidation catalysts and chemisorbed deoxidation catalysts used for deoxidation from ethylene gas have drawbacks such as high cost,limited deoxidation capacity,and frequent regeneration requirements.Deep deoxidation catalysts for ethylene gas were prepared by loading Pd-Ag bimetallic active components onto the γ-Al2O3 support modified with rare earth oxides.The performance of the deep deoxidation catalysts for ethylene gas was investigated,and the structures of both the support and the catalyst were characterized using X-ray diffraction(XRD),N2 adsorption/desorption and thermogravimetric analysis.The results show that the rare earth-modified support has larger pore volume and pore size(average pore size increases from 1.90 nm before modification to 2.50 nm after modification),while the active component exhibits high dispersion and excellent low-temperature deoxidation activity.Oxygen in the ethylene gas can be reduced to less than 1×10-6(volume fraction of O2)at temperature between 110 ℃ and 180 ℃.The catalyst maintains high deoxidation activity during a 1650 h life test at conditions of space velocity of 5000 h-1 and reaction temperature of 145 ℃,without requiring reduction and regeneration before or during use.
关键词
乙烯/催化剂/深度脱氧/稀土改性Key words
ethylene/catalyst/deep deoxidation/rare earth modification引用本文复制引用
基金项目
四川省科技成果转移转化示范项目(2021ZHCG0020)
出版年
2024
国家科技期刊平台
NSTL
万方数据