Thermal decomposition of sodium amide, NaNH2, and sodium amide hydroxide composites, NaNH2-NaOH

doi:10.1039/c6cp01604a

	Thermal decomposition of sodium amide, NaNH2, and sodium amide hydroxide composites, NaNH2-NaOH
	Jepsen, Lars H.1,2,3; Wang, Peikun 4; Wu, Guotao 4; Xiong, Zhitao 4; Besenbacher, Flemming 5,6; Chen, Ping 4; Jensen, Torben R.1,2
刊名	PHYSICAL CHEMISTRY CHEMICAL PHYSICS
	2016-09-28
卷号	18 期号:36 页码:25257-25264
ISSN号	1463-9076
DOI	10.1039/c6cp01604a
文献子类	Article
英文摘要	Sodium amide, NaNH2, has recently been shown to be a useful catalyst to decompose NH3 into H-2 and N-2, however, sodium hydroxide is omnipresent and commercially available NaNH2 usually contains impurities of NaOH (<2%). The thermal decomposition of NaNH2 and NaNH2-NaOH composites is systematically investigated and discussed. NaNH2 is partially dissolved in NaOH at T > 100 degrees C, forming a non-stoichiometric solid solution of Na(OH)(1-x)(NH2)(x) (0 < x < similar to 0.30), which crystallizes in an orthorhombic unit cell with the space group P2(1)2(1)2(1) determined by synchrotron powder X-ray diffraction. The composite xNaNH(2)-(1 - x)NaOH (similar to 0.70 < x < 0.72) shows a lowered melting point, similar to 160 degrees C, compared to 200 and 318 degrees C for neat NaNH2 and NaOH, respectively. We report that 0.36 mol of NH3 per mol of NaNH2 is released below 400 degrees C during heating in an argon atmosphere, initiated at its melting point, T = 200 degrees C, possibly due to the formation of the mixed sodium amide imide solid solution. Furthermore, NaOH reacts with NaNH2 at elevated temperatures and provides the release of additional NH3.
WOS关键词	HYDROGEN STORAGE MATERIALS ; AMMONIA ; BOROHYDRIDES ; DIFFRACTION ; HYDRIDES ; SYSTEM ; NA3N
WOS研究方向	Chemistry ; Physics
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000384249300051
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/170150]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者	Jensen, Torben R.
作者单位	1.Aarhus Univ, Interdisciplinary Nanosci Ctr, Ctr Mat Crystallog, Langelandsgade 140, DK-8000 Aarhus C, Denmark 2.Aarhus Univ, Dept Chem, Langelandsgade 140, DK-8000 Aarhus C, Denmark 3.Danish Technol Inst, Kongsvang Alle 29, DK-8000 Aarhus C, Denmark 4.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China 5.Aarhus Univ, Interdisciplinary Nanosci Ctr iNANO, Ny Munkegade 120, DK-8000 Aarhus C, Denmark 6.Aarhus Univ, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
推荐引用方式 GB/T 7714	Jepsen, Lars H.,Wang, Peikun,Wu, Guotao,et al. Thermal decomposition of sodium amide, NaNH2, and sodium amide hydroxide composites, NaNH2-NaOH[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2016,18(36):25257-25264.
APA	Jepsen, Lars H..,Wang, Peikun.,Wu, Guotao.,Xiong, Zhitao.,Besenbacher, Flemming.,...&Jensen, Torben R..(2016).Thermal decomposition of sodium amide, NaNH2, and sodium amide hydroxide composites, NaNH2-NaOH.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,18(36),25257-25264.
MLA	Jepsen, Lars H.,et al."Thermal decomposition of sodium amide, NaNH2, and sodium amide hydroxide composites, NaNH2-NaOH".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 18.36(2016):25257-25264.