posted on 2020-03-23, 22:05authored byYiwei Sun, Zhanfan Ke, Yuning Tang, Sa Wang, Ying Wu, Qibin Xia, Zhong Li
It
is critical to enhance further the stability and adsorption
selectivity of MOFs for promoting applications of MOFs. Herein, we
proposed an effective bifunctional SBU-tuning strategy to synthesize
novel Pyr1/3@Cu–BTC for the separation of propylene/propane.
Pyr@ Cu–BTC was synthesized by grafting of pyrrole onto Cu–BTC.
Its water vapor stability and separation property were then examined.
The resulting Pyr1/3@Cu–BTC showed not only enhanced
water vapor stability but also superhigh C3H6 adsorption capacity as well as C3H6/C3H8 selectivity at 1 bar and 298 K, reaching 7.60
mmol/g and 8.3 separately, much higher than most MOFs. Experiments
of water vapor stability indicated that after being placed under humid
air (RH of 55%) for 20 days, Pyr1/3@Cu–BTC still
retained its crystalline structure. The application of the fixed bed
of Pyr1/3@Cu–BTC could completely separate C3H6 and C3H8 from their mixture
at ambient conditions. Pyr1/3@Cu–BTC is promising
for the separation of propylene/propane or propylene recovery from
dry gas.