为探索一种具有工业应用价值的碳酸乙烯酯生产工艺(EC),采用环氧乙烷(EO)与二氧化碳为原料,以高催化活性、易于获取且价格低廉的溴化四乙铵(TEAB)为催化剂,采用单变量考察以及正交实验的方法,探索了反应温度、反应压力、催化剂质量分数...为探索一种具有工业应用价值的碳酸乙烯酯生产工艺(EC),采用环氧乙烷(EO)与二氧化碳为原料,以高催化活性、易于获取且价格低廉的溴化四乙铵(TEAB)为催化剂,采用单变量考察以及正交实验的方法,探索了反应温度、反应压力、催化剂质量分数、反应时间以及初始进料EC与EO的比例对EC收率的影响,以求高收率地得到EC产品.研究表明,在5.5 MPa,180℃,催化剂TEAB与EO的质量百分比为0.3%,反应时间为120 m in,初始进料配比EC/EO为1.0的反应条件下,EC收率可以达到98%.实验验证了该催化剂的活性在11次循环后仍保持稳定.展开更多
The effect of tetra ethyl ammonium bromide （TEAB） as an additive on the structural, morphological characteristics of the cobalt metal produced from aqueous sulphate solutions was investigated. The concentration of T...The effect of tetra ethyl ammonium bromide （TEAB） as an additive on the structural, morphological characteristics of the cobalt metal produced from aqueous sulphate solutions was investigated. The concentration of TEAB was varied in a range of 1-50 mg/L to evaluate its effect on current efficiency, energy consumption and quality of electrodeposited cobalt metal. Smooth and bright deposits of cobalt were obtained at low concentration of TEAB （10 mg/L） maintaining a current efficiency of 99.6%, with a low energy consumption of 2.38 kW＇h/kg. X-ray diffraction studies reveal that （100） plane is the most preferred plane of crystal growth during cobalt electrodeposition. Scanning electron micrographs indicate that smooth and uniform deposit of cobalt is obtained at 10 mg/L beyond which the deposit quality deteriorates. Cyclic voltammetric studies indicate that the presence of TEAB in the electrolytic bath polarizes the cathode and decreases the cathodic current considerably. XPS results confirm the electrodeposition of high pure cobalt with no sign of chemical bonding with TEAB as evident from the FTIR spectra.展开更多
文摘为探索一种具有工业应用价值的碳酸乙烯酯生产工艺(EC),采用环氧乙烷(EO)与二氧化碳为原料,以高催化活性、易于获取且价格低廉的溴化四乙铵(TEAB)为催化剂,采用单变量考察以及正交实验的方法,探索了反应温度、反应压力、催化剂质量分数、反应时间以及初始进料EC与EO的比例对EC收率的影响,以求高收率地得到EC产品.研究表明,在5.5 MPa,180℃,催化剂TEAB与EO的质量百分比为0.3%,反应时间为120 m in,初始进料配比EC/EO为1.0的反应条件下,EC收率可以达到98%.实验验证了该催化剂的活性在11次循环后仍保持稳定.
文摘The effect of tetra ethyl ammonium bromide （TEAB） as an additive on the structural, morphological characteristics of the cobalt metal produced from aqueous sulphate solutions was investigated. The concentration of TEAB was varied in a range of 1-50 mg/L to evaluate its effect on current efficiency, energy consumption and quality of electrodeposited cobalt metal. Smooth and bright deposits of cobalt were obtained at low concentration of TEAB （10 mg/L） maintaining a current efficiency of 99.6%, with a low energy consumption of 2.38 kW＇h/kg. X-ray diffraction studies reveal that （100） plane is the most preferred plane of crystal growth during cobalt electrodeposition. Scanning electron micrographs indicate that smooth and uniform deposit of cobalt is obtained at 10 mg/L beyond which the deposit quality deteriorates. Cyclic voltammetric studies indicate that the presence of TEAB in the electrolytic bath polarizes the cathode and decreases the cathodic current considerably. XPS results confirm the electrodeposition of high pure cobalt with no sign of chemical bonding with TEAB as evident from the FTIR spectra.
