摘要
采用变化pH值法和恒定pH值法 ,以硝酸镍、硝酸铝为原料 ,NaOH为沉淀剂水热合成了层状化合物镍铝水滑石。分别测定了Ni/Al摩尔比为0 5、1 0、2 0、6 0和10 0混合金属盐溶液的NaOH滴定曲线 ,并利用XRD对滴定过程中不同pH值阶段的合成物进行物相鉴定。实验结果表明 ,在Ni/Al=1 0～6 0范围内 ,不论起始混合盐溶液中Ni/Al摩尔比如何 ,在pH=5.0～6 .0范围内 ,均能合成结构单一的镍铝水滑石 ,随Ni/Al比的增加 ,合成的HTLc(水滑石)中镍含量随之增加 ;合成体系在较低pH(3 3～4 .8)范围为Al(OH) 3 生成阶段 ,较高pH(6.0～7 .5)范围为Ni(OH) 2 和HTLc 的共生阶段。该研究同时考察了其它因素在合成过程中的影响 ,筛选出镍铝水滑石合成的最佳条件。
The preparation of NiAl hydrotalcite like compound[NiAl HTLc]was studied.NiAl HTLcwas synthesized by the methods of variable and constant pH respectively with the materials of Ni(NO3)2、Al(NO3)3、Na(OH).It was studied that evolution of pH versus NaOH(mmol)during the basic titration of solutions containing Ni/Al=0.5、1.0、2.0、6.0、10.0.Phases of synthesized compound at different pH were detected by XRD.It was shown that pure NiAl HTLc can be prepared at pH=5.0～6.0 domin whenerer Ni/Al ratio was in mixed salt solutions.Nickel content increased with increasing of Ni/Al ratio.At lower pH values,Al(OH)3 was formed(3.3< pH< 4.8).At higher pH values,the excess of divalent metal precipitated as Ni(OH)2 and HTLS was formed (6.0< pH< 7.5).The effect of other factors on prepared HTLc were disscused also.The best conditions of preparation of HTLc were obtained.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2000年第1期43-46,共4页
Chinese Journal of Inorganic Chemistry
关键词
镍铝复合物
催化剂
水滑石
阴离子粘土
制备
Ni Al compound layered compound hydrotalcite anioni clay preparation
