开发了钠焙烧-还原浸出联合工艺从废Pd/Al_(2)O_(3)催化剂中回收Pd和Al_(2)O_(3)。钠化焙烧热力学分析表明,在最佳的Na_(2)O/Al_(2)O_(3)摩尔比和温度下,NaOH、Na_(2)CO_(3)和Na_(2)C2O4均可以与Al_(2)O_(3)完全反应生成Na Al O2。NaOH...开发了钠焙烧-还原浸出联合工艺从废Pd/Al_(2)O_(3)催化剂中回收Pd和Al_(2)O_(3)。钠化焙烧热力学分析表明,在最佳的Na_(2)O/Al_(2)O_(3)摩尔比和温度下,NaOH、Na_(2)CO_(3)和Na_(2)C2O4均可以与Al_(2)O_(3)完全反应生成Na Al O2。NaOH、Na_(2)CO_(3)和Na_(2)C_(2)O_(4)的焙烧渣经水浸后,Al_(2)O_(3)浸出率分别为99.6%、61.0%和55.3%。机械活化-NaOH无水焙烧工艺避免了焙烧渣的固结且可获得较高的Al_(2)O_(3)浸出率。N_(2)H_(4)·H_(2)O还原浸出避免了水浸过程中Pd的溶解损失且催化剂中99.7%的Al_(2)O_(3)被浸出。最终得到Na Al O2浸出液和富钯渣,其中有价的铝和钯可被进一步回收。展开更多
采用PAN为显色剂,通过分光光度法测定反应体系中催化剂Pd(PPh3)2Cl2的浓度,以探讨氯苄单羰基化合成苯乙酸反应中Pd(PPh3)2Cl2水解失活的动力学方程.结果表明,Pd2+与PAN显色的较佳条件为:在10 mL 1～20×10-6Pd2+含量的溶液中,加入0....采用PAN为显色剂,通过分光光度法测定反应体系中催化剂Pd(PPh3)2Cl2的浓度,以探讨氯苄单羰基化合成苯乙酸反应中Pd(PPh3)2Cl2水解失活的动力学方程.结果表明,Pd2+与PAN显色的较佳条件为:在10 mL 1～20×10-6Pd2+含量的溶液中,加入0.5 mL0.04%的PAN,在pH=3.0、40℃的水浴中加热30 min;其摩尔吸光系数e=1.384×104 L·mol-1·cm-1;Pd(PPh3)2Cl2水解反应对三苯基膦氯化钯浓度呈0.5级;对三苯基膦浓度呈-0.8级;对苯乙酸浓度呈2级;对碱中和剂NaOH的浓度呈1.2级.Pd(PPh.)2C12水解反应的活化能E=75.59 kJ·mol-1,指前因子为1.68×1012.展开更多
基金the financial support from the Science and Technology Plan of Yunnan Province,China(No.2018ZE001)the National Key Research and Development Program of China(No.2018YFE0110200)+1 种基金the Key Research and Development Program of Hunan Province,China(No.2020SK2125)the Science and Technology Plan of Department of Natural Resources of Hunan Province,China(No.2020-21)。
文摘开发了钠焙烧-还原浸出联合工艺从废Pd/Al_(2)O_(3)催化剂中回收Pd和Al_(2)O_(3)。钠化焙烧热力学分析表明,在最佳的Na_(2)O/Al_(2)O_(3)摩尔比和温度下,NaOH、Na_(2)CO_(3)和Na_(2)C2O4均可以与Al_(2)O_(3)完全反应生成Na Al O2。NaOH、Na_(2)CO_(3)和Na_(2)C_(2)O_(4)的焙烧渣经水浸后,Al_(2)O_(3)浸出率分别为99.6%、61.0%和55.3%。机械活化-NaOH无水焙烧工艺避免了焙烧渣的固结且可获得较高的Al_(2)O_(3)浸出率。N_(2)H_(4)·H_(2)O还原浸出避免了水浸过程中Pd的溶解损失且催化剂中99.7%的Al_(2)O_(3)被浸出。最终得到Na Al O2浸出液和富钯渣,其中有价的铝和钯可被进一步回收。
基金supported by Climate Change Response Project (NRF-2019M1A2A2065612)Brainlink Project (NRF-2022H1D3A3A01081140) funded by the Ministry of Science and ICT of Korea via National Research Foundation+1 种基金by research funds from Hanhwa Solutions Chemicals (2.220990.01) and UNIST (1.190013.01)supported by the Institute for Basic Science (IBS-R019-D1)。
