对常见的黑臭河道水进行水质分析,使用微波辅助类芬顿技术进行预处理,发现可生化性显著提高,特别有利于后续生物处理.在此基础上,开发新型铜铁双组分负载催化剂,以COD为指标对水质进行改善研究,当铜铁物质的量之比为1∶1、铜铁物质的量...对常见的黑臭河道水进行水质分析,使用微波辅助类芬顿技术进行预处理,发现可生化性显著提高,特别有利于后续生物处理.在此基础上,开发新型铜铁双组分负载催化剂,以COD为指标对水质进行改善研究,当铜铁物质的量之比为1∶1、铜铁物质的量总量为15 mmol、焙烧温度为400℃、过氧化氢投加量为6 m L/250 m L废水、微波辐照功率为中高火(539 W)、辐照时间为6 min时,污水COD去除率最高,为71.19%.同时对催化剂进行了机理分析和表征,结果表明铜氧化物的催化湿式氧化反应与铁氧化物的类芬顿反应表现出相互耦合机制.展开更多
Iron-based perovskite-type compounds modified by Ru were prepared through sol-gel process to study its catalytic activity of NOx direct decomposition at low temperature and evaluate the conversion of NO under the expe...Iron-based perovskite-type compounds modified by Ru were prepared through sol-gel process to study its catalytic activity of NOx direct decomposition at low temperature and evaluate the conversion of NO under the experimental conditions. The catalytic activity of La 0.9Ce 0.1Fe 0.8-nCo 0.2RunO3 （n=0.01,0.03,0.05,0.07,0.09）series for the NO, NO-CO two components, CO-HC-NO three components were also analyzed. The catalytic investigation evidenced that the presence of Ru is necessary for making highly activity in decomposition of nitric oxide even at low temperature（400 ℃）and La 0.9Ce 0.9Fe 0.75Co 0.2Ru 0.05O3 （n=0.05） has better activity in all the samples, the conversion of it is 58.5%. With the reducing gas（CO,C3H6）added into the gas, the catalyst displayed very high activity in decomposition of NO and the conversion of it is 80% and 92.5% separately.展开更多
Iron-based composite nanostructures with ceria or titania as shell coating on naked iron spheres were successfully synthesized and used to catalyze ammonia decomposition. The structure and texture of fresh and used ca...Iron-based composite nanostructures with ceria or titania as shell coating on naked iron spheres were successfully synthesized and used to catalyze ammonia decomposition. The structure and texture of fresh and used catalysts were characterized by transmission electron microscopy, X-ray diffraction, in situ X-ray diffraction, temperature-programmed reduction by hydrogen, and N2 adsorption-desorption. For ammonia decomposition, the iron-based composite catalyst coated with cerium and titanium showed excellent catalytic activity compared with naked iron sphere catalyst, with the former yielding nearly 100 % ammonia conversions at 650 ℃ and showing high stability in the catalysis test （for 60 h） at 600 ℃ with a space velocity of 24,000 cm3 gcat h-1. These results showed that adding cerium and titanium played a key role in improving catalytic activity for ammonia decomposition and enabling high thermal stability.展开更多
文摘对常见的黑臭河道水进行水质分析,使用微波辅助类芬顿技术进行预处理,发现可生化性显著提高,特别有利于后续生物处理.在此基础上,开发新型铜铁双组分负载催化剂,以COD为指标对水质进行改善研究,当铜铁物质的量之比为1∶1、铜铁物质的量总量为15 mmol、焙烧温度为400℃、过氧化氢投加量为6 m L/250 m L废水、微波辐照功率为中高火(539 W)、辐照时间为6 min时,污水COD去除率最高,为71.19%.同时对催化剂进行了机理分析和表征,结果表明铜氧化物的催化湿式氧化反应与铁氧化物的类芬顿反应表现出相互耦合机制.
基金Sponsored by the National Natural Science Foundation of China(Grant No.20271019 and 20576027), Natural Science Foundation of Heilongjiang Prov-ince(Grant No.B200504), Postdoctoral Foundationof Heilongjiang Province(Grant No.LBH-Z05066) and Education Department Foundation of Hei-longjiang Province(Grant No.11511270).
文摘Iron-based perovskite-type compounds modified by Ru were prepared through sol-gel process to study its catalytic activity of NOx direct decomposition at low temperature and evaluate the conversion of NO under the experimental conditions. The catalytic activity of La 0.9Ce 0.1Fe 0.8-nCo 0.2RunO3 （n=0.01,0.03,0.05,0.07,0.09）series for the NO, NO-CO two components, CO-HC-NO three components were also analyzed. The catalytic investigation evidenced that the presence of Ru is necessary for making highly activity in decomposition of nitric oxide even at low temperature（400 ℃）and La 0.9Ce 0.9Fe 0.75Co 0.2Ru 0.05O3 （n=0.05） has better activity in all the samples, the conversion of it is 58.5%. With the reducing gas（CO,C3H6）added into the gas, the catalyst displayed very high activity in decomposition of NO and the conversion of it is 80% and 92.5% separately.
文摘Iron-based composite nanostructures with ceria or titania as shell coating on naked iron spheres were successfully synthesized and used to catalyze ammonia decomposition. The structure and texture of fresh and used catalysts were characterized by transmission electron microscopy, X-ray diffraction, in situ X-ray diffraction, temperature-programmed reduction by hydrogen, and N2 adsorption-desorption. For ammonia decomposition, the iron-based composite catalyst coated with cerium and titanium showed excellent catalytic activity compared with naked iron sphere catalyst, with the former yielding nearly 100 % ammonia conversions at 650 ℃ and showing high stability in the catalysis test （for 60 h） at 600 ℃ with a space velocity of 24,000 cm3 gcat h-1. These results showed that adding cerium and titanium played a key role in improving catalytic activity for ammonia decomposition and enabling high thermal stability.
