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中南大学学报(自然科学版)

Journal of Central South University

第32卷    第3期    总第139期    2001年6月

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文章编号:1005-9792(2001)03-0247-04
从氯盐体系制备丙烯氨氧化用催化剂(Ⅰ)
———铋系催化剂的制备与表征
唐谟堂,金胜明

(中南大学冶金科学与工程系,湖南长沙 410083)

摘 要: 以铋精矿为原料,通过氯化浸出—干馏制取高纯BiCl3,再用浸渍法、浸渍—沉淀法、淤浆混合法由BiCl3和浓度为2.0 mol·L-1的HCl处理海泡石制备丙烯氨氧化催化剂,用(NH4)2CO3溶液洗涤Cl-,并通过XRD和BET对这种催化剂进行表征.研究结果表明:含0.25 mol·L-1的(NH4)2CO3的二次蒸馏水溶液脱氯效果显著,固体表面残余Cl-含量为20 g/t;海泡石负载活性组分后,晶体结构发生改变,海泡石特征峰消失,比表面积从98·0 m2·g-1降到
31.5 m2·g-1,孔径从10~40 nm增加至40~100 nm;采用这种方法能制备海泡石负载的多元氧化物催化剂,该催化剂的活性组分分布均匀,比表面积适宜,孔径分布符合要求.

 

关键字: 铋精矿;丙烯;氨氧化;含铋催化剂;表征

Preparation of catalyst for ammoxidation of propylene
in the chlorination salts system(Ⅰ)
Preparation and characterization of the supported bismuth-containing catalyst
TANGMo-tang,JIN Sheng-ming

Department of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:The catalyst for propylene ammoxidation from sepiolite and pure BiCl3produced from bismuth concentrate and sepiolite with chlorination-leaching-dry distillation process was prepared by impregnation-precipitation, slurry mixing method by use of removing Cl-with (NH4)2CO3 solution and characterized by XRD and BET-apparatus. Concentration of CO32-in solution determined the rate of Cl-removing. 20 g/t of remainder of Cl-was found on the catalyst surface washed by 0.25 mol·L-1(NH4)2CO3 secondary distilled water solution. The crystal structure of sepiolite was changed and the specific peak of sepiolite lost on XRD diagram after activity components were supported. Experimental results showed that the supported metal elements oxides catalyst could be prepared from natural resource through this process.Active components are uniformly distributed, specific surface area and porous size distribution are suitable in the catalyst.

 

Key words: bismuth concentrate; propylene; ammoxidation; Bi-containing catalyst; characterization

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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