With zirconium oxychloride, nitrate of lime and ammonia as raw materials, nano powder of CaO ZrO 2 was prepared by chemical coprecipitation method. By use of azeotropic distillation processing, chemical coprecipitatio...With zirconium oxychloride, nitrate of lime and ammonia as raw materials, nano powder of CaO ZrO 2 was prepared by chemical coprecipitation method. By use of azeotropic distillation processing, chemical coprecipitation precursor was obtained. Phase transformation of the precursor was observed at the temperature of 593.81 ℃ and 1 234.56 ℃ respectively with DTA analyses. Phase structure was analyzed through XRD and Raman spectra. The average particle size of tetragonal zirconium oxide powder was 9.8 and 43.7 nm after calcination at 600 and 1 100 ℃ respectively which was tested by TEM and BET analyses. Furthermore, the influences of the doping of nitrate of lime and the average particle size of zirconium oxide on the stability of tetragonal zirconium oxide were also discussed.展开更多
以磷石膏作为钙源,优化了磷石膏制备氧化钙基二氧化碳吸附剂的工艺参数(反应时间、反应温度、二氧化碳通量、搅拌速度和杂质含量),并考察了纳米氧化钙基二氧化碳吸附剂粒径对吸附性能的影响。得到的最佳工艺条件为:反应时间为50 min,温...以磷石膏作为钙源,优化了磷石膏制备氧化钙基二氧化碳吸附剂的工艺参数(反应时间、反应温度、二氧化碳通量、搅拌速度和杂质含量),并考察了纳米氧化钙基二氧化碳吸附剂粒径对吸附性能的影响。得到的最佳工艺条件为:反应时间为50 min,温度为30℃,二氧化碳通量为251 m L/min,搅拌速率越慢越好,杂质含量越少越好。纳米氧化钙基二氧化碳吸附剂的粒径越小,其吸附量就越大,吸附速率也越快,其稳定性也就越高。展开更多
文摘With zirconium oxychloride, nitrate of lime and ammonia as raw materials, nano powder of CaO ZrO 2 was prepared by chemical coprecipitation method. By use of azeotropic distillation processing, chemical coprecipitation precursor was obtained. Phase transformation of the precursor was observed at the temperature of 593.81 ℃ and 1 234.56 ℃ respectively with DTA analyses. Phase structure was analyzed through XRD and Raman spectra. The average particle size of tetragonal zirconium oxide powder was 9.8 and 43.7 nm after calcination at 600 and 1 100 ℃ respectively which was tested by TEM and BET analyses. Furthermore, the influences of the doping of nitrate of lime and the average particle size of zirconium oxide on the stability of tetragonal zirconium oxide were also discussed.
文摘以磷石膏作为钙源,优化了磷石膏制备氧化钙基二氧化碳吸附剂的工艺参数(反应时间、反应温度、二氧化碳通量、搅拌速度和杂质含量),并考察了纳米氧化钙基二氧化碳吸附剂粒径对吸附性能的影响。得到的最佳工艺条件为:反应时间为50 min,温度为30℃,二氧化碳通量为251 m L/min,搅拌速率越慢越好,杂质含量越少越好。纳米氧化钙基二氧化碳吸附剂的粒径越小,其吸附量就越大,吸附速率也越快,其稳定性也就越高。
