钾对Co-Mo/γ-Al_2O_3催化剂催化活性的影响

利用微反催化剂活性评价、程序升温还原、磁天平等实验手段 ,研究了钾对 Co- Mo/γ- Al2 O3催化剂的活性、钴和钼在γ- Al2 O3上的分散度及还原气氛下磁化率等性能的影响。实验结果表明引入钾可以降低 Co- Mo /γ- Al2 O3催化剂的还原温度 ,提高钴、钼在 r- Al2 O3上的分散度     

溴酸钾氧化中性红褪色动力学光度法测定痕量锡

基于0 036mol/L的H2SO4介质中,痕量锡对溴酸钾氧化中性红的褪色反应有良好的催化作用,建立了测定痕量锡的催化动力学光度法。方法检出限为0.82μg/L,线性范围为0～20μg/L。结合磷酸三丁酯色谱分离,对水系沉积物国家标准物质进行分析,结果与标准值相符;对w(Ti)为10-6水平的试样检测,其RSD(n=6)≤6 3%。     

钌催化高碘酸钾氧化二甲基黄动力学光度法测定痕量钌

基于在Tween 2 0存在的 0 .1mol/LH2 SO4溶液中 ,在 90± 0.5℃水浴条件下 ,Ru 催化高碘酸钾氧化二甲基黄的褪色反应 ,提出了测定钌的新催化光度法。钌浓度在 0 .0 0 2～ 0 .0 2 0 μg/ 1 0mL范围内呈线性关系 ,检出限为 4 .87× 1 0 -5 μg/mL。对 0.0 1 μg/ 1 0mLRu 测定的相对标准偏差为 1 . 9% (n =9)。催化反应的表观活化能为 1 2 7 1kJ/mol。催化反应为一级反应。此法满意地用于某些冶金产品和矿     

水溶液中硫酸钾晶体生长动力学

The single crystal growth rates of potassium sulfate in pure aqueous solution under different conditions were determined by photomicrography in a flow system for crystal growth. The effects of themain controlling factors, such as supersaturation, crystal size, solution velocity and crystal growth temperature, on crystal growth rates of potassium sulfate were discussed in detail by using non-linear regression from the experimental data, and several empirical relationships were given. The results showed that the growth rates of crystals increased with supersaturation, crystal size, solution velocity and temperature. Moreover supersaturation was the most important controlling factor influencing growth rates of crystals, crystal size and solution velocity were the secondary and temperature was the least.Furthermore, It was found that the growth rate of crystals along the [100] crystallographic axis was higher than that along the [001] in the same condition. The effect of every factor on crystal growth rates along the [100] crystallographic axis was stronger than that along the [001].     

Cu-Ni/ZrSiO催化剂的制备及其对CO_2和CH_3OH合成DMC的反应性能

采用表面反应改性法制备了ZrO2 SiO2 (ZrSiO)复合载体 ,以等体积浸渍法制备了ZrSiO担载的Cu Ni及Cu Ni K2 O催化剂。用IR、TPSR MS和MRS 90 1微反技术考察了CO2 和CH3OH在催化剂上的化学吸附和反应性能。结果表明 ,CO2 在金属位 (M )和Lewis酸位Zrn + 的协同作用下形成卧式吸附态M CO O→Zrn + ,CH3OH在Zrn + 和Zr O 两类中心的协同作用下形成解离吸附态Zr OCH3 和Zr OH ;在适宜的反应条件 (温度 140℃、压力 0 6MPa、空速 144 0h 1、n(CH3OH) /n(CO2 ) =2下 ,反应的总碳转化率可达 8% ,生成DMC的选择性大于 87% ;适量引入助剂K2 O可明显提高DMC的收率     

浅析新型白酒中食用酒精的处理

新型白酒已成为白酒业的重要组成部分,食用酒精是生产新型白酒最重要的基础物质,食用酒精的处理方法有：（1）高锰酸钾法,高锰酸钾的最适添加量：在玉米酒精中为千分之0．5,木薯酒精为千分之0．9,糖蜜酒精中为0．7‰。（2）活性法,玉米酒精中加0．8‰的203型活性炭,适中,木薯酒精加1．2‰的203型活性炭,蜜酒精中加1．0‰的205型活性炭最好。（3）综合法,即在不同原料生产的食用酒精中添加最佳高锰酸钾和活性炭用量,混合处理,效果更好。     

硫酸铵-碘化钾-溴化十六烷基三甲基铵体系浮选分离铋的研究

研究了硫酸铵-碘化钾-溴化十六烷基三甲基铵体系浮选分离铋的行为及其与常见离子分离的条件。试验表明,控制pH1.0,能使Bi(Ⅲ）与常见离子Zn(Ⅱ)、Fe(Ⅲ)、Al(Ⅲ）、Co(Ⅱ)、Ni(Ⅱ)、Mn(Ⅱ）分离。     

有机溶剂析盐法生产试剂氯化钾

进行了用丙酮结晶析出工业氯化钾饱和水溶液中的氯化钾的研究。丙酮能有效地从饱和溶液中分离出氯化钾 ,据此开发出一种生产试剂氯化钾的新工艺 ,该工艺与传统工艺相比 ,具有流程简单 ,操作条件宽松 ,能耗低等优点     

The effects of a potassium overlayer on the reaction pathway of CH2 and C2H5 on Rh(111)

The effect of potassium on the reaction pathways of adsorbed CH₂ and C₂H₅ species on Rh(111) was investigated by means of reflection absorption infrared spectroscopy (RAIRS) and temperature programmed desorption (TDS). Hydrocarbon fragments were produced by thermal and photo-induced dissociation of the corresponding iodo compounds. Potassium adatoms markedly stabilized the adsorbed CH₂ and converted it into C₂H₄, the formation of which was not observed for K-free Rh(111). New routes of the surface reactions of C₂H₅ have been also opened in the presence of potassium, namely its transformation into butane and butene.     

HPLC/ESI/MS分析座果宝原料中的杂质成分

用高效液相色谱 /电喷雾离子化质谱联用技术 (HPLC/ESI/MS法 ) ,建立了座果宝原料药的HPLC杂质分析方法 ,确定了植物生长调节剂座果宝原料药中的杂质为 2 ,4 二氯苯氧基乙酸钾