摘要
在共沉淀过程中引入硝酸铝,制备了碱式碳酸锌和锌铝水滑石前驱体,通过焙烧得到铝掺杂氧化锌吸附剂。考察了硝酸铝加入量、pH值、加料速率、溶液浓度及前驱体中残余钠含量对所制备吸附剂性能的影响,通过X射线衍射、扫描电镜和低温N_(2)吸附对吸附剂物化性能进行了表征,并考察了吸附剂的脱硫反应性能。结果表明:硝酸铝的引入,改变了前驱体的结晶状态,前驱体由碱式碳酸锌部分变为类水滑石结构,焙烧后铝掺杂的氧化锌晶粒变小,吸附剂的比表面积和孔容增大,吸附剂硫容增加,活性组分利用率明显提高。前驱体中残余钠含量对吸附剂的性能有显著影响。
Adsorbent precursors were prepared by homogeneous precipitation method,aluminum nitrate was introduced into the process,Al-doped zinc oxide adsorbent was obtained by calcination.The effects of aluminum nitrate addition,pH value,feeding speed,solution concentration and residual sodium in the precursor on properties of the prepared adsorbent were investigated.The physicochemical properties of adsorbent were characterized by X-ray diffraction,scanning electron microscope and low-temperature N_(2) adsorption,and the desulfurization reaction performance of adsorbent was investigated.The results showed that the addition of aluminum additives changed the crystalline state of the precursor,the precursor changed from basic zinc carbonate to hydrotalcite like structure,the grain size of zinc oxide after calcination was smaller,the specific surface area and pore volume of the adsorbent increased,the sulfur capacity of the adsorbent increased,and the utilization rate of active components was significantly improved.The residual sodium content in the precursor has a significant effect on the performance of the adsorbent.
作者
贾银娟
王灿
刘志成
高焕新
JIA Yinjuan;WANG Can;LIU Zhicheng;GAO Huanxin(State Key Laboratory of Green Chemical Engineering and Industrial Catalysis,Shanghai Research Institute of Petrochemical Technology,SINOPEC,Shanghai 201208,China)
出处
《化学反应工程与工艺》
CAS
2022年第4期355-361,384,共8页
Chemical Reaction Engineering and Technology
关键词
氧化锌
铝掺杂
共沉淀
吸附剂
脱硫
zinc oxide
aluminum-doping
coprecipitation
adsorbent
desulfurization
