Experimental studies on the poisoning properties of a low-plateau hydrogen storage alloy LaNi_4.3Al_0.7 against CO impurities

Metal hydride (MH) material can be used for effective separation of hydrogen from gas mixture. However, some impurities in the feedstock gas may cause the poisoning of the material and hence failure of the MH-based hydrogen separation system. In this paper, the hydrogen storage alloy LaNi_4.3Al_0.7, which has low-plateau pressure and was supposed to be used for hydrogen separation from the semi-coke oven gas, was tested in the atmosphere with relatively high concentration of CO impurities (∼0.1%v/v) by cycling experiments. Interestingly, the hydrogen storage capacity of the material shows quite mild decline during contact with CO at the temperature of 363 K or higher, and relatively fast kinetics can be kept, highlighting its application potential for hydrogen separation on a variety of occasions.