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

来源期刊：中南大学学报(自然科学版)2001年第3期

论文作者：唐谟堂 金胜明

文章页码：247 - 250

关键词：铋精矿;丙烯;氨氧化;含铋催化剂;表征

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

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.

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 CO₃^2-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.