Application of surface-modified metal hydrides for hydrogen separation from gas mixtures containing carbon dioxide and monoxide

作者：Lototskyy M^*; Modibane K D; Williams M; Klochko Ye; Linkov V; Pollet B G

来源：Journal of Alloys and Compounds, 2013, 580: S382-S385.

DOI：10.1016/j.jallcom.2013.02.096

• Metal hydrides
• Coating materials
• Surfaces and interfaces
• Chemical synthesis
• Gas-solid reactions
• Kinetics

Application of surface-modified MH material for H-2 separation using temperature/pressure swing absorption-desorption was studied. The substrate alloy had the following composition LaNi3.55Co0.75Al0.4Mn0.3, and the surface modification was carried out through fluorination followed by aminosilane functionalization and electroless deposition of Pd. The material was found to have good poisoning tolerance towards surface adsorbates, even for the large (similar to 1.5 kg) batches. Feasibility of its application for H-2 separation from gas mixtures (up to 30% CO2 and 100 ppm CO) was demonstrated by testing of a prototype H-2 separation system (similar to 280 g of MH in two reactors), and H-2 separation reactor (0.75 kg of MH). The H-2 separation was characterized by stable performances in the duration of 250 absorption/desorption cycles. However, the total process productivity was found to be limited by the sluggish H-2 absorption (partial H-2 pressure <= 2.5 bar, temperature below 100 degrees C). In the presence of CO2 and CO, additional deceleration of H-2 absorption was observed at space velocities of the feed gas below 5000 h(-1).

• 出版日期2013-12-15