还原方法对Pd/有机硅杂化膜的结构及性能影响
Effects of reduction methods on the structure and performance of Pd/organosilica hybrid membranes
吴梓豪 1任秀秀 1姚政 1徐荣 1郭猛 1钟璟 1沈敏2
作者信息
- 1. 常州大学 石油化工学院,中国石油-常州大学创新联合体,江苏省绿色催化材料与技术重点实验室,江苏 常州 213164
- 2. 江苏美淼环保科技有限公司,江苏 常州 213164
- 折叠
摘要
为了提高有机硅膜对氢气的渗透选择性,将氯化钯(PdCl2)加入 1,6-双(三乙氧基硅基)己烷(BTESH)形成的有机硅溶胶中,采用溶胶-凝胶法制备成膜,然后对Pd2+进行还原,研究了乙醇、乙二醇和H2/N2 氛围 3 种方法对Pd还原程度的影响,并将形成的Pd/BTESH膜用于氢气分离.结果表明:乙醇没有还原性,H2/N2 氛围比乙二醇表现出更强的Pd还原能力,在氢气分离中展示出最好的分离性能,H2/N2 选择性达到 11.4.在H2/N2 还原下,随着Pd掺杂量的增加,膜的H2 渗透率先降低后升高,选择性则相反.经过Pd掺杂量的优化,在 200℃下Pd/BTESH-0.2 膜比BTESH有机硅膜的H2/N2 选择性提高了 72%,且表现出良好的水热稳定性.
Abstract
To improve hydrogen permeation selectivity of organosilica membranes,palladium chloride(PdCl2)was incorporated into 1,6-bis(triethoxysilicyl)hexane(BTESH)derived sols to prepare membranes via a sol-gel method.Pd2+was then reduced and the effects of ethanol,ethylene glycol and H2/N2 atmosphere on the reduction degree of Pd were studied.The obtained Pd/BTESH hybrid membranes were tested for hydrogen separation.The results show that ethanol has no reducing capacity,and H2/N2 atmosphere displays a stronger reducing ability with a better hydrogen separation selectivity than that of ethylene glycol reduction,and the corresponding membrane shows H2/N2 selectivity of 14.As the Pd contents increase in BTESH under H2/N2 reduction,the H2 permeance decreases first and then increases,while selectivity is inverse.After optimization of Pd contents,the Pd/BTESH-0.2 membrane shows a H2/N2 selectivity 72%higher than that of BTESH organosilica membranes at 200℃.In addition,the Pd/BTESH membrane has a good hydrothermal stability.
关键词
有机硅/还原方法/Pd/膜/氢气分离Key words
organosilica/reduction method/Pd/membrane/hydrogen separation引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据