首页|含钛渣制备多孔沸石分子筛吸附剂及其CO2吸附性能

含钛渣制备多孔沸石分子筛吸附剂及其CO2吸附性能

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以钒钛磁铁矿高炉冶炼产生的水淬渣为主要原料,经"酸处理-碱熔-水热晶化"制备了多孔沸石分子筛吸附剂(简称吸附剂,下同),采用XRD、SEM、FTIR对吸附剂进行了表征,考察了NaAlO2添加量对吸附剂结构的影响,采用动态吸附法评价了吸附剂的CO2吸附性能,考察了预处理温度、吸附温度和CO2 流量对吸附剂的 CO2 吸附性能的影响,并利用动力学模型进行了数据拟合,分析了其吸附行为.结果表明,随着 NaAlO2 添加量的增加,水热晶化产物依次完成了"无定形→初步结晶→FAU型→LTA型"沸石分子筛的结构转变;制备的吸附剂(Z-4)经350℃预处理,在吸附温度 25℃、CO2流量分别为1.4 mL/min(固定床反应装置)和50 mL/min(同步热分析仪)的条件下,CO2吸附效果最佳,其CO2穿透与饱和吸附量为2.16、3.39 mmol/g;其CO2吸附行为符合拟二级动力学模型,吸附过程由物理和化学吸附共同主导,拟二级动力学模型吸附速率常数为 0.0785 mmol/(g·s);经5次循环吸附/再生后,其CO2饱和吸附量保持率为96.8%.
Preparation and CO2 adsorption performance of porous zeolite molecular sieve adsorbents using titanium-bearing slag
Porous zeolite molecular sieve adsorbents were prepared by acid treatment-alkali melting-hydrothermal crystallization using titanium-containing blast furnace slag produced during smelting process of vanadium titanium magnetite concentrate as raw material,and characterized by XRD,SEM and FTIR,with the influence of NaAlO2 addition on its structure analyzed.The CO2 adsorption performance of the adsorbents obtained were evaluated via dynamic adsorption method,while the effects of pretreatment temperature,adsorption temperature and CO2 flow rate on its CO2 adsorption performance were further investigated and the adsorption behavior was analyzed by kinetic models.The results showed that,with the increase of NaAlO2 addition,the hydrothermally crystallized product exhibited zeolite structure transforming from"amorphous→preliminary crystallization→FAU type→LTA type".The prepared adsorbent(Z-4)activated at 350℃exhibited the best adsorption performance at adsorption temperature of 25℃and CO2 flow rate of 1.4 mL/min(fixed bed reactor)or 50 mL/min(simultaneous thermal analyzer),with the CO2 breakthrough and saturation adsorption capacities reaching 2.16 and 3.39 mmol/g,respectively.The CO2 adsorption behavior conformed to the pseudo-second-order kinetic model,mainly dominated by physical and chemical adsorption,while the adsorption rate constant could reach 0.0785 mmol/(g·s).After 5 cycles of adsorption/regeneration,the retention rate of CO2 saturation adsorption was 96.8%.

titanium-bearing slaghydrothermal synthesisporous zeolite molecular sieveCO2 adsorptionadsorption kineticsfunctional materials

皇甫林、尚波、罗中秋、祖运、周新涛

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钒钛资源综合利用国家重点实验室,四川 攀枝花 617000

昆明理工大学 化学工程学院,云南 昆明 650500

含钛渣 水热合成 多孔沸石分子筛 CO2吸附 吸附动力学 功能材料

钒钛资源综合利用国家重点实验室开放课题云南省科技厅昆明理工大学"双一流"联合专项昆明理工大学分析测试基金项目

2022P4FZG03A202101BE070001-0312022T20160009

2024

10.13550/j.jxhg.20230795

精细化工
大连化工研究院设计院 中国化工学会精细化工专业委员会 辽宁省化工研究院

精细化工

CSTPCD北大核心
影响因子：0.557
ISSN：1003-5214
年,卷(期)：2024.41(8)
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