通过溶液中的过硫酸铵与D301树脂表面的叔胺基形成氧化-还原引发体系,将水溶性阳离子烯类功能单体甲基丙烯酰氧乙基三甲基氯化铵(DMC)接枝到D301树脂表面,制得了新型阴离子型离子交换树脂D301-g-PDMC。考察了主要接枝条件(时间、温度、...通过溶液中的过硫酸铵与D301树脂表面的叔胺基形成氧化-还原引发体系,将水溶性阳离子烯类功能单体甲基丙烯酰氧乙基三甲基氯化铵(DMC)接枝到D301树脂表面,制得了新型阴离子型离子交换树脂D301-g-PDMC。考察了主要接枝条件(时间、温度、引发剂及单体用量)对接枝度的影响,并研究了D301-g-PDMC对AuCl_4^-的吸附性能。结果表明,反应时间为10 h,反应温度为35℃,过硫酸铵用量为1.6%,DMC用量为17 m L时,PDMC的接枝度最高,可达26.67%。D301-g-PDMC对AuCl_4^-有很强的吸附能力,吸附容量可以达到748.03 mg/g。此外,D301-g-PDMC对AuCl_4^-的吸附效率可达97.83%。展开更多
In this work, we investigated the structural and the optical properties of AuCl semiconductor nanocrystals embedded in KCl single crystals. The AuCl nanocrystals were obtained by doping the KCl crystalline matrix with...In this work, we investigated the structural and the optical properties of AuCl semiconductor nanocrystals embedded in KCl single crystals. The AuCl nanocrystals were obtained by doping the KCl crystalline matrix with gold using the Czochralski method. The X-ray diffraction showed the formation of the AuCl nanocrystals in KCl with a tetragonal structure. The average radius of the AuCl nanocrystals is estimated using the Scherrer formula. The photoluminescence spectra presented a band emission situated at 580 nm leading to the formation of the AuCl nanocrystals within KCl.展开更多
Commercialization of acetylene hydrochlorination using AuCl3 catalysts has been impeded by its poor stability. We have been studying that nitrogen-modified Au/NAC catalyst delivered a stable performance which can impr...Commercialization of acetylene hydrochlorination using AuCl3 catalysts has been impeded by its poor stability. We have been studying that nitrogen-modified Au/NAC catalyst delivered a stable performance which can improve acetylene hydrochlorination activity and has resistance to catalytic deactivation. Here we show that nitrogen and sulfur co-doped activated carbon supported AuCl3 catalyst worked as efficient catalysts for the hydrochlorination of acetylene to vinyl chloride. Au/NSAC catalyst demonstrated high activity comparative to Au/AC catalyst. Furthermore, it also delivered stable performance within the selectivity of acetylene, reaching more than 99.5%, and there was only a 3.3% C2H2 conversion loss after running for 12 h under the reaction conditions of a temperature of 180 C and a C2H2 hourly space velocity of 1480 h 1. The presence of the sulfur atoms may serve to immobilize/ anchor the Au and also help prevent reduction and sintering of the Au and hence improve the catalytic activity and stability. The excellent catalytic performance of the Au/NSAC catalyst demonstrated its potential as an alternative to mercury chloride catalysts for acetylene hydrochlorination.展开更多
文摘通过溶液中的过硫酸铵与D301树脂表面的叔胺基形成氧化-还原引发体系,将水溶性阳离子烯类功能单体甲基丙烯酰氧乙基三甲基氯化铵(DMC)接枝到D301树脂表面,制得了新型阴离子型离子交换树脂D301-g-PDMC。考察了主要接枝条件(时间、温度、引发剂及单体用量)对接枝度的影响,并研究了D301-g-PDMC对AuCl_4^-的吸附性能。结果表明,反应时间为10 h,反应温度为35℃,过硫酸铵用量为1.6%,DMC用量为17 m L时,PDMC的接枝度最高,可达26.67%。D301-g-PDMC对AuCl_4^-有很强的吸附能力,吸附容量可以达到748.03 mg/g。此外,D301-g-PDMC对AuCl_4^-的吸附效率可达97.83%。
文摘In this work, we investigated the structural and the optical properties of AuCl semiconductor nanocrystals embedded in KCl single crystals. The AuCl nanocrystals were obtained by doping the KCl crystalline matrix with gold using the Czochralski method. The X-ray diffraction showed the formation of the AuCl nanocrystals in KCl with a tetragonal structure. The average radius of the AuCl nanocrystals is estimated using the Scherrer formula. The photoluminescence spectra presented a band emission situated at 580 nm leading to the formation of the AuCl nanocrystals within KCl.
文摘Commercialization of acetylene hydrochlorination using AuCl3 catalysts has been impeded by its poor stability. We have been studying that nitrogen-modified Au/NAC catalyst delivered a stable performance which can improve acetylene hydrochlorination activity and has resistance to catalytic deactivation. Here we show that nitrogen and sulfur co-doped activated carbon supported AuCl3 catalyst worked as efficient catalysts for the hydrochlorination of acetylene to vinyl chloride. Au/NSAC catalyst demonstrated high activity comparative to Au/AC catalyst. Furthermore, it also delivered stable performance within the selectivity of acetylene, reaching more than 99.5%, and there was only a 3.3% C2H2 conversion loss after running for 12 h under the reaction conditions of a temperature of 180 C and a C2H2 hourly space velocity of 1480 h 1. The presence of the sulfur atoms may serve to immobilize/ anchor the Au and also help prevent reduction and sintering of the Au and hence improve the catalytic activity and stability. The excellent catalytic performance of the Au/NSAC catalyst demonstrated its potential as an alternative to mercury chloride catalysts for acetylene hydrochlorination.
