摘要
铝基催化剂是石油精炼行业中需求量最大、用途最广的催化剂。将报废无法继续使用的铝基废催化剂载体回收再生,可大幅度地提高工业催化过程的综合经济效益。本研究工作通过“钠化焙烧-弱碱性浸出”将用于轻质油催化重整工艺的废Pt-Sn/Al_(2)O_(3)催化剂中的铝元素回收得到NaAlO_(2)溶液,并采用反沉淀法将NaAlO_(2)制备成具有高比表面积、大孔体积的介孔γ-Al_(2)O_(3)。通过改变焙烧温度、原料质量比、浸出pH等参数,研究铝浸出率的影响规律,在焙烧温度为450℃、质量比为1.2、浸出pH为8.5的条件下,铝的浸出率高达99.9%,效果最佳。将回收的NaAlO_(2)溶液制备为介孔γ-Al_(2)O_(3),利用X射线粉末衍射仪(XRD)、Brunner−Emmet−Teller(BET)、粒度分析仪等对制备的样品进行表征。结果表明,在焙烧温度为500℃、老化时间为12h、反应pH为10的条件下,合成的介孔氧化铝比表面积为284.19m^(2)/g,孔体积为0.47cm^(3)/g,平均孔径为6.65nm,且其孔径分布均一、颗粒均匀程度良好,所得再生γ-Al_(2)O_(3)的比表面积、粒径等均满足《氧化铝》(GB/T24487—2022),样品纯度可达99.9%。
Aluminum-based catalyst is the most demanding and widely used catalyst in petroleum refining industry.The comprehensive economic benefits of industrial catalytic process can be greatly improved by recycling the discarded aluminum-based spent catalyst support that can not be used any more.In this study,the aluminum support from spent Pt-Sn/Al_(2)O_(3)catalyst was recovered by“sodium roasting-weak alkaline leaching”to obtain NaAlO_(2)solution,and NaAlO_(2)was prepared into mesoporous alumina with high specific surface area and large pore volume by reverse precipitation.By changing the parameters such as roasting temperature,mass ratio of raw materials and leaching pH,the leaching rate of aluminum was optimized.Under the conditions of roasting temperature of 450℃,mass ratio of 1.2 and leaching pH of 8.5,the leaching rate of aluminum could reach 99.9%.Mesoporous alumina was prepared from recovered NaAlO_(2)solution,and prepared samples were characterized by X-ray diffraction(XRD),Brunner-Emmet-Teller(BET)and particle size analyzer.The results show that under the conditions of calcination temperature of 500℃,aging time of 12h and reaction pH of 10,the specific surface area of mesoporous alumina synthesized is 284.19m2/g,the pore volume is 0.47cm3/g,and the average pore diameter is 6.65nm.The pore size distribution is uniform and the particle uniformity is good.The specific surface area and particle size of the regenerated alumina meet the national standard of alumina(GB/T24487—2022).
作者
李琳
黄国勇
徐盛明
郁丰善
翁雅青
曹才放
温嘉玮
王春霞
王俊莲
顾斌涛
张袁华
刘斌
王才平
潘剑明
徐泽良
王翀
王珂
LI Lin;HUANG Guoyong;XU Shengming;YU Fengshan;WENG Yaqing;CAO Caifang;WEN Jiawei;WANG Chunxia;WANG Junlian;GU Bintao;ZHANG Yuanhua;LIU Bin;WANG Caiping;PAN Jianming;XU Zeliang;WANG Chong;WANG Ke(College of New Energy and Materials,China University of Petroleum,Beijing 102249,China;Jiangxi Naihua Environmental Protection Technology Co.,Ltd.,Shangrao 334000,Jiangxi,China;Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China;Jiangxi Province Junxin Precious Metal Technology Materials Co.,Ltd.,Shangrao 335500,Jiangxi,China;Jiangxi Academy of Sciences,Nanchang 330096,Jiangxi,China;Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;College of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Zhejiang Micro General New Catalytic materials Co.,Ltd.,Lishui 323300,Zhejiang,China;Hengfeng Kaiyi Industrial Co.,Ltd.,Shangrao 334300,Jiangxi,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2024年第S01期640-649,共10页
Chemical Industry and Engineering Progress
基金
国家重点研发计划(2021YFC2901100)
国家自然科学基金(52274307)
中国石油大学科学基金(2462021QNX2010)
重油加工国家重点实验室(HON-KFKT2022-10)。
关键词
催化剂载体
弱碱性浸出
偏铝酸钠
反沉淀法
再生
氧化铝
理化指标调控
catalyst support
weak alkaline leaching
NaAlO_(2)
inverse precipitation method
regeneration
alumina
physical and chemical index regulation
