A series of tungstate red phosphors K_(1-x)Li_(x)Eu(WO_(4))_(2-y)(SO_(4))_(y)were successfully prepared by sol-gel method,and the effects of the introduction of Li~+and SO_(4)^(2-)on the fluorescence intensity and the...A series of tungstate red phosphors K_(1-x)Li_(x)Eu(WO_(4))_(2-y)(SO_(4))_(y)were successfully prepared by sol-gel method,and the effects of the introduction of Li~+and SO_(4)^(2-)on the fluorescence intensity and thermal quenching properties of the prepared K_(1-x)Li_(x)Eu(WO_(4))_(2-y)(SO_(4))_(y)phosphors were investigated.The X-ray diffraction data show that the prepared(Li^(+)and SO_(4)^(2-))-doped KEu(WO_(4))_(2)phosphors have a monoclinic tetragonal structure.In addition,the emission intensities of all the observed emission peaks change significantly with the increase of Li~+doping concentration,especially the intensity of the emission peaks at 615 nm fluctuated significantly and reached the maximum at x=0.3 and y=0.2.The K_(1-x)Li_(x)Eu(WO_(4))_(2-y)(SO_(4))_(y)phosphors are found to have the highest fluorescence intensity at x=0.3 and y=0.2.Moreover,the K_(0.7)Li_(0.3)Eu(WO_(4))_(1.8)(SO_(4))_(0.2)phosphor has better thermal quenching properties and luminescence efficiency,and the experimental results indicates that the fluorescence intensity and thermal burst performance of KEu(WO_(4))_(2)red phosphor could be effectively improved by using low-cost bionic doping of Li^(+)and SO_(4)^(2-).展开更多
The syntheis of diphenyletylane with xylol and styrene as reactants and solid superacid SO42-/TiO2 doped rare-earth metal ion La3+ as a catalyst was reported.The results showed that the optimal conditions were using 1...The syntheis of diphenyletylane with xylol and styrene as reactants and solid superacid SO42-/TiO2 doped rare-earth metal ion La3+ as a catalyst was reported.The results showed that the optimal conditions were using 1% of catalyst with the molar ration of xylol to styrene being 7.5:1,at temperature of 140℃ for 3 h;The yield of diphenylethylane under such conditions was about 97.5%.展开更多
制备了 SO_4^(2-)/La_2O_3～TiO_2-HZSM-5超强酸催化剂,用于催化癸二酸和正丁醇的酯化反应,研究了制备条件对催化剂性能的影响。结果表明:La^(3+)浸渍浓度为0.07 mol/L,经110℃烘干后于500℃焙烧3 h 所得催化剂的活性较好。用正交实验...制备了 SO_4^(2-)/La_2O_3～TiO_2-HZSM-5超强酸催化剂,用于催化癸二酸和正丁醇的酯化反应,研究了制备条件对催化剂性能的影响。结果表明:La^(3+)浸渍浓度为0.07 mol/L,经110℃烘干后于500℃焙烧3 h 所得催化剂的活性较好。用正交实验法考察了酯化反应的影响因素,最佳实验条件为:正丁醇/癸二酸(物质的量比)=4:1,反应时间3 h,催化剂用量1.5%(质量分数),酯化率可达98.7%。该催化剂具有良好的重复使用和再生能力。展开更多
A new solid acid catalyst SO42-MoO3TiO2 was prepared.FT-IR data had indicted that the surface of the catalyst had strong acidic centers.FTIR spectra of pyridine absorbed on the surface showed that th...A new solid acid catalyst SO42-MoO3TiO2 was prepared.FT-IR data had indicted that the surface of the catalyst had strong acidic centers.FTIR spectra of pyridine absorbed on the surface showed that the catalyst had Bronsted acid site.The catalyst had high catalytic activity and excellent selectivity in esterification,acetalation and ketal formation as well as no corrosion to the facilities.The catalyst was an enviormentally friendly catalyst.展开更多
基金Funded by the Science and Technology Bureau of Chengdu City(No.2022-YF05-02119-SN)。
文摘A series of tungstate red phosphors K_(1-x)Li_(x)Eu(WO_(4))_(2-y)(SO_(4))_(y)were successfully prepared by sol-gel method,and the effects of the introduction of Li~+and SO_(4)^(2-)on the fluorescence intensity and thermal quenching properties of the prepared K_(1-x)Li_(x)Eu(WO_(4))_(2-y)(SO_(4))_(y)phosphors were investigated.The X-ray diffraction data show that the prepared(Li^(+)and SO_(4)^(2-))-doped KEu(WO_(4))_(2)phosphors have a monoclinic tetragonal structure.In addition,the emission intensities of all the observed emission peaks change significantly with the increase of Li~+doping concentration,especially the intensity of the emission peaks at 615 nm fluctuated significantly and reached the maximum at x=0.3 and y=0.2.The K_(1-x)Li_(x)Eu(WO_(4))_(2-y)(SO_(4))_(y)phosphors are found to have the highest fluorescence intensity at x=0.3 and y=0.2.Moreover,the K_(0.7)Li_(0.3)Eu(WO_(4))_(1.8)(SO_(4))_(0.2)phosphor has better thermal quenching properties and luminescence efficiency,and the experimental results indicates that the fluorescence intensity and thermal burst performance of KEu(WO_(4))_(2)red phosphor could be effectively improved by using low-cost bionic doping of Li^(+)and SO_(4)^(2-).
文摘The syntheis of diphenyletylane with xylol and styrene as reactants and solid superacid SO42-/TiO2 doped rare-earth metal ion La3+ as a catalyst was reported.The results showed that the optimal conditions were using 1% of catalyst with the molar ration of xylol to styrene being 7.5:1,at temperature of 140℃ for 3 h;The yield of diphenylethylane under such conditions was about 97.5%.
文摘A new solid acid catalyst SO42-MoO3TiO2 was prepared.FT-IR data had indicted that the surface of the catalyst had strong acidic centers.FTIR spectra of pyridine absorbed on the surface showed that the catalyst had Bronsted acid site.The catalyst had high catalytic activity and excellent selectivity in esterification,acetalation and ketal formation as well as no corrosion to the facilities.The catalyst was an enviormentally friendly catalyst.
