摘要
由于氟氯烃（ＣＦＣｓ）对大气臭氧层的破坏作用，使得开发ＣＦＣｓ无污染替代品的研究成为热门课题［１～４］．氢氟烃（ＨＦＣｓ，如ＨＦＣ－１３４ａ）是ＣＦＣｓ的理想替代物．在氟氯交换合成ＨＦＣ－１３４ａ的反应中，ＡｌＦ３基催化剂的活性、稳定性明显优于ＣｒＦ...
The effects of Cr 3+ content in CrF 3/AlF 3 catalysts on activity for synthesis of HF 134a from reaction of HCFC 133a with HF were investigated. FTIR, EPR and XPS have been employed to characterize the CrF 3/AlF 3 catalysts. The results show that CrF 3 existed in a monolayer dispersion where the interaction between CrF 3 and AlF 3 support became stronger when Cr 3+ content less than 1%. The CrF 3/AlF 3 catalyst with 0.1% Cr 3+ exhibits the highest turnover frequency. The residual oxygen in the catalyst forms surface active species of CrAlO m F n from the interaction of CrF 3 and AlF 3, which is the cause of high selectivity to HFC 134a in F/Cl exchange reaction.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第10期1677-1679,共3页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
氢氟烃
HFC-134A
合成
催化剂
四氟乙烷
Interaction of CrF 3 and AlF 3
Turnover frequency
1
1
1
2 Tetrafluoroethane
Active species(Ed.: Y
X)
