Ultrafine Powder CuO was prepared by direct-heating Cu2(OH)2CO3 in differe nt calcination temperatures. XRD, FT-IR, SEM and surface area measurement tech niques were used to investigate the properties of the CuO powde...Ultrafine Powder CuO was prepared by direct-heating Cu2(OH)2CO3 in differe nt calcination temperatures. XRD, FT-IR, SEM and surface area measurement tech niques were used to investigate the properties of the CuO powder. The results sh ow that the decomposition temperature has remarkably effect on crystallite size, morphology, surface structure, IR behavior and activity of the powder for H2O2 decomposition. The major morphology of the particle is fluffy-sphered in the l ower temperature, which is consists of small sheets of crystallite. With the inc reasing of calcination temperature, crystal of CuO grows up, the fluffy-sphere d particle reduces and catalytic activity decreases. FT-IR patterns revealed t hat the absorption of Cu-O and -OH bond in CuO ultrafine powder were red-s hifted.展开更多
Nano-CuO was prepared by heating nano-Cu2(OH)2CO3 precursors in different calcination temperatures. The precursor was synthesized from water-alcohol mixed solution of Cu(Ac)2 using mixed solution of NaOH and Na2CO3 as...Nano-CuO was prepared by heating nano-Cu2(OH)2CO3 precursors in different calcination temperatures. The precursor was synthesized from water-alcohol mixed solution of Cu(Ac)2 using mixed solution of NaOH and Na2CO3 as precipitants. XRD, FT-IR, TEM, TG-DTA and surface area measurement techniques were used to investigate the properties of the CuO powder. The results show that the spherical, well dispersed nano-CuO powder with the average size of 15 nm and higher catalytic activity for H2O2 decomposition was obtained at 300 ℃. With the increasing of calcination temperature, crystal of CuO grows up, agglomeration of the powder becomes heavier and catalytic activity decreases. FT-IR patterns revealed that the vibration fine structure of Cu-O bond in nano-CuO powder disappears and main absorption is red-shifted with the average size of nano-CuO reducing.展开更多
In order to resolve the problem whether more excellent combinational demulsifiers for north shaanxi oil fields of Changqing could be made from the commercial demulsifiers used for the oil fields at present,four excell...In order to resolve the problem whether more excellent combinational demulsifiers for north shaanxi oil fields of Changqing could be made from the commercial demulsifiers used for the oil fields at present,four excellent demulsifiers for the representative crude oils from Baota district,Ansai and Zichang in the oil fields,YT-100,GT-940,HQ96-1,SP-169,were screened out.One combinational demulsifier was formed by the combination of one of the four demulsifiers with another of the four in different proportions,and the capability of combinational demulsifiers in demulsification/dehydration was compared at total demulsifier use level of 100mg/L at 55℃ in 2h by bottle tests.The dehydrating efficiency of combinational demulsifier of GT-940 and HQ96-1 was higher than GT-940 or HQ96-1 for all the crude oils,and the proportion of GT-940 to HQ96-1 in combinational demulsifier which dehydrating efficiency was highest was respectively 4∶1,4∶1 and 3∶2 for Baota district,Ansai and Zichang crude oils.The dehydrating velocity of combinational demulsifier of YT-100 and GT-940 was higher than YT-100 or GT-940 for Ansai crude oil and the proportion of YT-100 to GT-940 in the combinational demulsifier is 4∶1.The dehydrating efficiency of combinational demulsifier of YT-100 and HQ96-1 was higher than YT-100 or HQ96-1 for Zichang crude oil and the proportion of YT-100 to HQ96-1 in combinational demulsifier which dehydrating efficiency was highest is 2∶3.The dehydrating efficiency of combinational demulsifier of SP-169 and HQ96-1 is higher than SP-169 or HQ96-1 for Baota district crude oil and the proportion of SP-169 to HQ96-1 in combinational demulsifier which dehydrating effciency was highest is 2∶3.展开更多
文摘Ultrafine Powder CuO was prepared by direct-heating Cu2(OH)2CO3 in differe nt calcination temperatures. XRD, FT-IR, SEM and surface area measurement tech niques were used to investigate the properties of the CuO powder. The results sh ow that the decomposition temperature has remarkably effect on crystallite size, morphology, surface structure, IR behavior and activity of the powder for H2O2 decomposition. The major morphology of the particle is fluffy-sphered in the l ower temperature, which is consists of small sheets of crystallite. With the inc reasing of calcination temperature, crystal of CuO grows up, the fluffy-sphere d particle reduces and catalytic activity decreases. FT-IR patterns revealed t hat the absorption of Cu-O and -OH bond in CuO ultrafine powder were red-s hifted.
文摘Nano-CuO was prepared by heating nano-Cu2(OH)2CO3 precursors in different calcination temperatures. The precursor was synthesized from water-alcohol mixed solution of Cu(Ac)2 using mixed solution of NaOH and Na2CO3 as precipitants. XRD, FT-IR, TEM, TG-DTA and surface area measurement techniques were used to investigate the properties of the CuO powder. The results show that the spherical, well dispersed nano-CuO powder with the average size of 15 nm and higher catalytic activity for H2O2 decomposition was obtained at 300 ℃. With the increasing of calcination temperature, crystal of CuO grows up, agglomeration of the powder becomes heavier and catalytic activity decreases. FT-IR patterns revealed that the vibration fine structure of Cu-O bond in nano-CuO powder disappears and main absorption is red-shifted with the average size of nano-CuO reducing.
文摘In order to resolve the problem whether more excellent combinational demulsifiers for north shaanxi oil fields of Changqing could be made from the commercial demulsifiers used for the oil fields at present,four excellent demulsifiers for the representative crude oils from Baota district,Ansai and Zichang in the oil fields,YT-100,GT-940,HQ96-1,SP-169,were screened out.One combinational demulsifier was formed by the combination of one of the four demulsifiers with another of the four in different proportions,and the capability of combinational demulsifiers in demulsification/dehydration was compared at total demulsifier use level of 100mg/L at 55℃ in 2h by bottle tests.The dehydrating efficiency of combinational demulsifier of GT-940 and HQ96-1 was higher than GT-940 or HQ96-1 for all the crude oils,and the proportion of GT-940 to HQ96-1 in combinational demulsifier which dehydrating efficiency was highest was respectively 4∶1,4∶1 and 3∶2 for Baota district,Ansai and Zichang crude oils.The dehydrating velocity of combinational demulsifier of YT-100 and GT-940 was higher than YT-100 or GT-940 for Ansai crude oil and the proportion of YT-100 to GT-940 in the combinational demulsifier is 4∶1.The dehydrating efficiency of combinational demulsifier of YT-100 and HQ96-1 was higher than YT-100 or HQ96-1 for Zichang crude oil and the proportion of YT-100 to HQ96-1 in combinational demulsifier which dehydrating efficiency was highest is 2∶3.The dehydrating efficiency of combinational demulsifier of SP-169 and HQ96-1 is higher than SP-169 or HQ96-1 for Baota district crude oil and the proportion of SP-169 to HQ96-1 in combinational demulsifier which dehydrating effciency was highest is 2∶3.
