通过TG-DSC和SEM对仲钼酸铵在空气中热分解过程进行分析,结果表明:仲钼酸铵在空气中的热分解过程经历了3个阶段:室温至222.6℃之间仲钼酸铵失去结晶水;从222.6～240.7℃之间仲钼酸铵热分解了部分氨根离子;从240.7～248.7℃之间氨根离子完全分解,同时有亚稳态的氧化钼生成.从248.7～322.5℃之间亚稳态的氧化钼发生相变生成了稳态的三氧化钼.与此同时,仲钼酸铵在热分解温度300℃以下时,其热分解产物的形貌几乎没有太大的变化;在300℃以上时,其热分解产物的形貌由原来不规则的块体向不规则的片状转变,最后转变为了较规则的片状三氧化钼.这主要是由于随着热分解温度的进一步升高,热分解产物之间的相互作用、迁移和重组加剧,以及在高温下三氧化钼的挥发与沉积所致.
参考文献
| [1] | 罗振中.我国钼工业现状及发展对策浅议[J].中国钼业,2000(04):3-6. |
| [2] | 彭志辉.稀有金属材料加工工艺学[M].长沙:中南大学出版社,2003 |
| [3] | 吴贤,张健,康新婷,荆鹏.钼粉的制备技术及研发现状[J].稀有金属材料与工程,2007(z3):562-566. |
| [4] | 邓集斌 .钼粉还原过程及工艺优化研究[D].中南大学,2005. |
| [5] | 朱爱辉,王快社,张兵.钼在冶金工业中的应用[J].中国钼业,2006(05):8-12. |
| [6] | Kim Du Soung;Kurusu Yaanhiko;Sogawa Kohichi;Wachs I E,Hardeastle F D .Physicochemical properties of MoO3-TiO2 prepared by an equilibrium adsorption method[J].Journal of Catalysis,1989,120:325. |
| [7] | Abhay K.Datta;Jin-Wook Ha;John R Regalbuto .The controlled dispersion of silica supported MoO3:The role of ammonia[J].Journal of Catalysis,1992,133(01):55. |
| [8] | Can Li;Hui Zhang;Kaili Wang;Yanfen Mian,Qin Xin .FTIR emission spectroscopic studies of the thermal decomposition of ammonium molybdate,vanadate,and tungstate[J].Appl Spectroac,1993,47(01):56. |
| [9] | Sxaczynski .Kinetics and mechanism of molybdenum(Ⅵ)oxide reduction[J].Journal of Solid State Chemistry,1995,118:84. |
| [10] | 尹周澜,周桂芝,赵秦生,陈绍衣,王思清,刘国荣.铜酸铵在氢气气氛中的还原行为[J].中国有色金属学报,1995(01):42-44. |
| [11] | 李军;刘心宇;成锐 .钼还原过程研究[J].中南大学学报（自然科学版）,1997,28(04):370. |
| [12] | Yin ZL.;Chen QY.;Li XH. .Study on the kinetics of the thermal decompositions of ammonium molybdates[J].Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems,2000(0):107-110. |
| [13] | Ressler T.;Jentoft RE.;Wienold J. .Formation of bronzes during temperature-programmed reduction of MoO3 with hydrogen - an in situ XRD and XAFS study[J].Solid state ionics,2001(Special Issue SI):243-251. |
| [14] | Werner V. Schulmeyer;Hugo M. Ortner .Mechanisms of the hydrogen reduction of molybdenum oxides[J].International Journal of Refractory Metals & Hard Materials,2002(4):261-269. |
| [15] | Shaheen W M .Thermal behaviour of pure and binary Fe(NO3)3@9H2O and(NH4)6Mo7O24@4H2O systems[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2007,445-446:113. |
| [16] | 程时定 .钼酸铵热分解的相变行为及动力学研究[D].中南大学,2008. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%