摘要
用不同结构的ZrO_2合成了一系列在高温下吸收CO2的Li2ZrO3材料,并详细的研究了反应物质的物理和化学性质对生成物吸收CO2性能的影响。采用SEM、XRD以及TG分析法分别进行了材料结构及其吸收CO2性能的表征,并使用XPS法测定了材料表面的元素组成。实验结果表明,使用不同结构的ZrO2合成的Li2ZrO3,其吸收CO2的性能明显的不同。用ZrO2(t)(四方)合成的Li2ZrO3吸收CO2的速度快,在500℃下,20%CO2(80%空气)的气氛中保持3h,其吸收量可达25(±0.6)%(wt),而以ZrO2(m)(单斜)为原料制备的Li2ZrO3在上述吸收条件下重量仅增加9(±0.6)%(wt)。此外,实验结果还表明化学元素的掺杂对用ZrO2(m)合成的Li2ZrO3的CO2吸收速度及吸收容量影响较大。
Lithium zirconate (Li2ZrO3) materials were synthesized from two different structured zirconium oxide (ZrO2), monoclinic ZrO2 (ZrO2(m)) and tetragonal ZrO2 (ZrO2(t)), and their absorption rate Of CO2 were compared. The results showed, in 20% CO2 (80% Air) atmosphere, their absorption abilities were significantly different where the ZrO2(t)-synthesized material evidently absorbed at a faster rate than the ZrO2(m)-synthesized one. The ZrO2(O-synthesized Li2ZrO3 reached absorption equilibrium after being kept for 3 h at 500 degreesC in 20% CO2 (80% Air) atmosphere, and attain to absorption capacity of 25(+/-0.6)%(wt). While at the same conditions, the absorption capacity for ZrO2(m)-synthesized Li2ZrO3 is only 9(+/-0.6)%(wt). In addition, the effects on the structure of Li2ZrO3, and the absorption capability Of CO2 from the amount of Li2CO3 in the reactants were investigated. Doping potassium (K) impacted the CO2 absorption rate of the Li2ZrO3, synthesized front ZrO2(t) slightly, but obviously on the Li2ZrO3 synthesized from ZrO2 (m),and the absorption rate reached peak value at Li2CO3:ZrO2:K2CO3=1:1:0.03.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2004年第7期770-774,共5页
Chinese Journal of Inorganic Chemistry
