CAJ | 학술논문

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＝0．5974（1）nm，b＝0．4466（2）nm，c＝1．4341（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。
연구료 LiBH4·NH3적열분해합성、결구급기방경행위。재밀폐반응기중，장 LiBH4적포화안합물가열지60～80℃진행열분해，성공제비득도 LiBH4·NH3。연구표명：해방법제비적 LiBH4·NH3적정포삼수위 a＝0．5974（1）nm，b＝0．4466（2）nm，c＝1．4341（3）nm；재아기류하，열분해제비득도적 LiBH4·NH3적분해과정시일개량보반응，기재교저온（＜300℃）시즉가분해석방출경기；재밀폐반응기중，양품적열분해가분위2개계단，재실온지300℃적범위내，LiBH4·NH3주요석방안기，동시반수방경，종300℃지600℃，주요발생적시방경반응，소석방적안여 LiBH4반응방경，동시반수착 LiBH4적분해방경。비교발현，통과수욕열해포화안합물적방법제비득도적 LiBH4·NH3적방경성능교상온추진공제비양품유명현개선。
This study focuses on thermal-decomposition synthesis,structure and dehydrogenation behaviors of lithium borohydride monoammoniate(LiBH4 ·NH3 ).LiBH4 ·NH3 was synthesized by thermal decomposition of the saturated ammoniateof LiBH4 at 60-80 ℃ in a closed reactor.The lattice parameters of the as-prepared LiBH4 ·NH3 were a=0.597 4(1)nm,b=0.446 6(2) nmand c=1.434 1(3)nm.Under Ar flow,the thermal decomposition of the as-prepared LiBH4 ·NH3 was a two-step reaction, and hydrogen was released below 300 ℃.While the as-prepared LiBH4 ·NH3 decomposed within the close reactor,it was also a two-step reaction.Simultaneous release of ammonia and hydrogen was observed below 300 ℃.At 300-600 ℃,the released am-monia combined with the intermediate LiBH4 to release hydrogen concurrent with the decomposition of LiBH4 .Compared to the performance of the sample synthesized by vacuuming at room temperature,the dehydrogenation performance of LiBH4 ·NH3 pre-pared by thermal decomposition of saturated ammoniate of LiBH4 was significantly improved.