功能材料(国外英文资料).docVIP

功能材料(国外英文资料) 1, the conditions of application of hydrogen storage materials (5) are enumerated The easy activation, absorbing amount of hydrogen; the metal hydride heat generated properly, too stable, unfavorable the release; in a very wide range of composition, and should have a stable and appropriate balance decompression (room temperature decomposition pressure 2~3atm) hydrogen absorption, hydrogen absorption and lag in the decomposition process (balance differential pressure); the heat transfer performance is good, not easy powder; the metal hydride in the transportation, reliable performance and safety; the chemical properties of hydrogen storage alloy is stable, durable, repeated hydrogen absorption after the impurity of small attenuation; such as oxygen, nitrogen, CO, CO2, water resistance grading poisoning ability; to cheap, environmentally friendly. 2 hydrogen storage material problems (choice) (1) pulverization of hydrogen storage materials. As the hydrogen storage materials expand in hydrogen absorption, the lattice shrinks when hydrogen is released, such as the absorption of hydrogen repeatedly, then the material can be changed into powder by repeated deformation. The hydrogen storage material in the fine powder state will not only lead to the obstruction of hydrogen gas flow, but also cause the pollution to the outside of the hydrogen stream. (2) the heat transfer problem of hydrogen storage materials. Release of hydrogen from the hydrogen storage material or CO hydrogenation, faster speed, higher temperature due to thermal conductivity of hydrogen storage material is very poor (generally only 1w/m. degrees, and close to the glass, not easy to make the thermal effect) effectively passed out, so it is necessary to solve technically. (3) there is hysteresis in hydrogen retention and discharge, and sometimes the horizontal section of the P-C curve is uneven, which is the reason for the decrease in efficiency. 3 factors affecting the ability of hydrogen sto