分别以正硅酸乙酯、硝酸镍为硅源和镍源 ,采用溶胶 -凝胶法 ,经超临界流体干燥和普通干燥制备了Ni O- A- Si O2 、 Ni O- G- Si O2 催化剂 ;以气凝胶和干凝胶为载体 ,采用浸渍法制备了 Ni O/ A- Si O2 、 Ni O/ G- Si O2 催化剂 .并用 ...分别以正硅酸乙酯、硝酸镍为硅源和镍源 ,采用溶胶 -凝胶法 ,经超临界流体干燥和普通干燥制备了Ni O- A- Si O2 、 Ni O- G- Si O2 催化剂 ;以气凝胶和干凝胶为载体 ,采用浸渍法制备了 Ni O/ A- Si O2 、 Ni O/ G- Si O2 催化剂 .并用 XRD、 TEM、 BET、 TPR等手段 ,研究了制备方法对催化剂织构、结构和 Ni物种存在形态的影响 .发现Ni O- A- Si O2 和 Ni O- G- Si O2 催化剂上高度分散的 Ni O簇团与 Si O2 之间有较强的相互作用 ,其顺酐液相选择加氢转化率低于 10 % ;Ni O/ G- Si O2 催化剂上 ,以单一物种形态存在的 Ni O与 Si O2 相互作用弱 ,顺酐转化率为 42 % ;Ni O/ A- Si O2 催化剂上 ,以多种形态存在的微晶 Ni O与 Si O2 间的相互作用较复杂 ,其顺酐液相选择加氢的转化率和丁二酸酐的选择性分别可达 10 0 %和 98%展开更多
The characteristics of absorption, fluorescence, room temperature phosphorescence(RTP) spectra of meso tetrakis(4 N trimethylaminobenzyl)porphin(TAPP) and Palladium porphyrin(Pd TAPP) probe in the presence and absence...The characteristics of absorption, fluorescence, room temperature phosphorescence(RTP) spectra of meso tetrakis(4 N trimethylaminobenzyl)porphin(TAPP) and Palladium porphyrin(Pd TAPP) probe in the presence and absence of ct DNA has been studied. Pd TAPP shows a very weak RTP emission in aqueous solution and strong RTP emission in the presence of DNA. Maximum RTP was observed at pH=7, with maximum excitation and emission wavelengths at 414 nm and 684 nm, respectively. RTP decay follows a first order exponential equation, RTP lifetime (τ) of probe is (0.72±0.03) ms. The detection limit of ct DNA may reach 8.8×10 -7 mol/L. The relative standard deviation(RSD) is less than ±6.6% in the linear range.展开更多
Five title compounds were synthesized and characterized by UV Vis, IR, elemental analysis, 1H NMR and fluorescence spectra. It is found that the fluorescence intensities of the compounds at optimum pH values were 16 t...Five title compounds were synthesized and characterized by UV Vis, IR, elemental analysis, 1H NMR and fluorescence spectra. It is found that the fluorescence intensities of the compounds at optimum pH values were 16 to 319 times as much as that of 4 aminoantipyrine. The influences of the substituents of the compounds on the fluorescence intensity have been discussed.展开更多
文摘分别以正硅酸乙酯、硝酸镍为硅源和镍源 ,采用溶胶 -凝胶法 ,经超临界流体干燥和普通干燥制备了Ni O- A- Si O2 、 Ni O- G- Si O2 催化剂 ;以气凝胶和干凝胶为载体 ,采用浸渍法制备了 Ni O/ A- Si O2 、 Ni O/ G- Si O2 催化剂 .并用 XRD、 TEM、 BET、 TPR等手段 ,研究了制备方法对催化剂织构、结构和 Ni物种存在形态的影响 .发现Ni O- A- Si O2 和 Ni O- G- Si O2 催化剂上高度分散的 Ni O簇团与 Si O2 之间有较强的相互作用 ,其顺酐液相选择加氢转化率低于 10 % ;Ni O/ G- Si O2 催化剂上 ,以单一物种形态存在的 Ni O与 Si O2 相互作用弱 ,顺酐转化率为 42 % ;Ni O/ A- Si O2 催化剂上 ,以多种形态存在的微晶 Ni O与 Si O2 间的相互作用较复杂 ,其顺酐液相选择加氢的转化率和丁二酸酐的选择性分别可达 10 0 %和 98%
文摘The characteristics of absorption, fluorescence, room temperature phosphorescence(RTP) spectra of meso tetrakis(4 N trimethylaminobenzyl)porphin(TAPP) and Palladium porphyrin(Pd TAPP) probe in the presence and absence of ct DNA has been studied. Pd TAPP shows a very weak RTP emission in aqueous solution and strong RTP emission in the presence of DNA. Maximum RTP was observed at pH=7, with maximum excitation and emission wavelengths at 414 nm and 684 nm, respectively. RTP decay follows a first order exponential equation, RTP lifetime (τ) of probe is (0.72±0.03) ms. The detection limit of ct DNA may reach 8.8×10 -7 mol/L. The relative standard deviation(RSD) is less than ±6.6% in the linear range.
文摘Five title compounds were synthesized and characterized by UV Vis, IR, elemental analysis, 1H NMR and fluorescence spectra. It is found that the fluorescence intensities of the compounds at optimum pH values were 16 to 319 times as much as that of 4 aminoantipyrine. The influences of the substituents of the compounds on the fluorescence intensity have been discussed.
