High-performance ammonia-selective MFI nanosheet membranes
High-performance ammonia-selective MFI nanosheet membranes
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DOI：
10.1039/d0cc07217f
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发表时间：
2021-01-16
影响因子：
4.9
通讯作者：
Tsapatsis, Michael
中科院分区：
文献类型：
--
作者：
Duan, Xuekui;Kim, Donghun;Tsapatsis, Michael
已知对烃异构体分离具有高度选择性的基于纳米片的MFI膜表现出2236的NH3/N-2混合物分离因子，其中NH3渗透率为1.1 × 10（-6）mol m（-2）s（-1）Pa-1，NH_3/H_2分离因子为307，NH_3渗透率为2.3 × 10 ~（-6）mol·m ~（-2）s ~（-1）Pa ~（-1）。与竞争性的基于吸附的分离一致，较低的操作温度和较高的压力导致分离因子增加。在323 K下，以等摩尔的NH3/N2混合进料，3和7 bar下的通量和分离因子分别为0.13 mol m（-2）s（-1）和191，以及0.26 mol m（-2）s（-1）和220。该性能与其它膜的性能相比是有利的，并且表明MFI膜可用于涉及氨合成和利用中遇到的NH3/N-2/H-2混合物的分离和纯化过程。该膜还表现出从H2中分离乙烷、正丙烷和正丁烷的高性能。
Nanosheet-based MFI membranes, known to be highly selective for hydrocarbon isomer separations, exhibit an NH3/N-2 mixture separation factor of 2236 with NH3 permeance of 1.1 x 10(-6) mol m(-2) s(-1) Pa-1, and NH3/H-2 separation factor of 307 with NH3 permeance of 2.3 x 10(-6) mol m(-2) s(-1) Pa-1 at room temperature. Consistent with a competitive sorption-based separation, lower operating temperatures and higher pressures result in increased separation factor. At 323 K, with an equimolar mixed feed of NH3/N-2, the fluxes and separation factors at 3 and 7 bar are 0.13 mol m(-2) s(-1) and 191, and 0.26 mol m(-2) s(-1) and 220, respectively. This performance compares favorably with that of other membranes and suggests that MFI membranes can be used in separation and purification processes involving mixtures of NH3/N-2/H-2 encountered in ammonia synthesis and utilization. The membranes also exhibit high performance for the separation of ethane, n-propane and n-butane from H-2.