Inami Hisao, Abe Chie, Hasegawa Yasuhisa
Hitachi Ltd., Research & Development Group, 832-2 Horiguchi, Hitachinaka 312-0034, Japan.
National Institute of Advanced Industrial Science and Technology (AIST), Research Institute for Chemical Process Technology, 4-2-1 Nigatake, Sendai 983-8551, Japan.
Membranes (Basel). 2021 May 10;11(5):348. doi: 10.3390/membranes11050348.
Ammonia (NH) and hydrogen sulfide (HS) are hazardous and odorous gases. A special device that is not affected by other gases is necessary so that it can detect such gases. Zeolite membranes can separate the desired component selectively by molecular sieving and selective adsorption. LTA-, MFI-, and FAU-type zeolite membranes were prepared in this study, and the permeation and separation performances were determined for the ternary mixture of NH, HS, and N to develop an NH selectively permeable membrane. Although the separation factors of NH were high enough for the LTA-type zeolite membrane, the NH permeance was the lowest among the three membranes. In contrast, the FAU-type zeolite membrane with Si/Al = 1.35 showed a high enough NH permeance and a NH/N separation factor. The membrane modification and varying the membrane composition were carried out to reduce the HS permeance. As a result, the HS permeance could be decreased by modification with silane coupling agents, and a separation factor of NH toward HS of over 3000 was achieved.
氨（NH₃）和硫化氢（H₂S）是有害且有气味的气体。需要一种不受其他气体影响的特殊装置来检测此类气体。沸石膜可通过分子筛和选择性吸附选择性地分离所需成分。本研究制备了LTA型、MFI型和FAU型沸石膜，并测定了NH₃、H₂S和N₂三元混合物的渗透和分离性能，以开发一种NH₃选择性渗透膜。尽管LTA型沸石膜对NH₃的分离因子足够高，但在三种膜中NH₃渗透率最低。相比之下，Si/Al = 1.35的FAU型沸石膜表现出足够高的NH₃渗透率和NH₃/N₂分离因子。进行了膜改性和改变膜组成以降低H₂S渗透率。结果，通过硅烷偶联剂改性可降低H₂S渗透率，实现了NH₃对H₂S的分离因子超过3000。
