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研究了LiBH4·NH3的热分解合成、结构及其放氢行为。在密闭反应器中,将LiBH4的饱和氨合物加热至60~80℃进行热分解,成功制备得到LiBH4·NH3。研究表明:该方法制备的LiBH4·NH3的晶胞参数为a=0.597 4(1)nm,b=0.4466(2)nm,c=1.434 1(3)nm;在氩气流下,热分解制备得到的LiBH4·NH3的分解过程是一个两步反应,其在较低温(<300℃)时即可分解释放出氢气;在密闭反应器中,样品的热分解可分为2个阶段,在室温至300℃的范围内,LiBH4·NH3主要释放氨气,同时伴随放氢,从300℃至600℃,主要发生的是放氢反应,所释放的氨与LiBH4反应放氢,同时伴随着LiBH4的分解放氢。比较发现,通过水浴热解饱和氨合物的方法制备得到的LiBH4·NH3的放氢性能较常温抽真空制备样品有明显改善。
The thermal decomposition synthesis, structure and hydrogen evolution behavior of LiBH4 · NH3 were studied. In a closed reactor, LiBH4 saturated ammonia will be heated to 60 ~ 80 ℃ thermal decomposition, the successful preparation of LiBH4 · NH3. The results show that the unit cell parameters of LiBH4 · NH3 prepared by this method are a = 0.597 4 (1) nm, b = 0.4466 (2) nm and c = 1.434 1 Of LiBH4 · NH3 decomposition process is a two-step reaction, which can be decomposed at lower temperatures (<300 ℃) to release hydrogen; in the closed reactor, the thermal decomposition of the sample can be divided into two stages, at room temperature to 300 ℃, LiBH4 · NH3 mainly releases ammonia gas, and at the same time it releases hydrogen from 300 ℃ to 600 ℃. The main reaction is the hydrogen desorption reaction. The released ammonia reacts with LiBH4 to release hydrogen and the content of LiBH4 Liberate hydrogen It was found that the desorption performance of LiBH4 · NH3 prepared by the method of pyrolyzing ammonia complex in the water bath was significantly improved compared with the sample prepared at room temperature.