摘要
采用模板剂-SiO_(2)联用改性并通过油柱成型法制备系列低密度、大孔容、高强度的球形SiO_(2)-Al_(2)O_(3)载体。600和1050℃焙烧后的载体经表征分析可知,模板剂的加入大幅度提高球形Al_(2)O_(3)的抗压碎强度,其中5%模板剂添加量时抗压碎强度增加了93.11%,且SiO_(2)的加入可有效降低球形Al_(2)O_(3)的堆密度并增大孔容。在最佳优化条件下,联用改性所制备的载体具有0.38 g·cm^(-3)的低堆密度及41.67 N·particle-1的高抗压碎强度,其平均孔径达到23.49 nm,孔容为1.00 cm^(3)·g^(-1),同时具备低密度和高强度两个难以兼容的基本特征。以改性Al_(2)O_(3)为载体,采用分批等体积浸渍法制备了系列高Pd负载量的氢同位素分离材料Pd/SiO_(2)-Al_(2)O_(3),并对其进行表征分析和吸/放氢循环性能测试。结果显示,该载钯材料表面光滑无裂纹,活性组分钯纳米颗粒主要负载在孔道内部,经300次吸/放氢循环测试后,30%Pd/SiO_(2)-Al_(2)O_(3)材料在102 s内达到吸附平衡,H/Pd(原子比)稳定保持在0.66~0.69,吸/放氢循环吸附性能稳定且抗粉化性能优异。
With the continuous reduction of fossil fuels and the continuous deterioration of the environment,the development of environment friendly energy was of great significance and urgency.Among many new clean energy sources,nuclear fusion energy was considered to be one of the most reliable alternatives to traditional fossil energy in the future due to its abundant raw materials,near zero carbon emissions and less environmental interference.At present,both of deuterium and tritium,the key raw material for nuclear fusion,were mainly obtained by thermal cycle adsorption process(TCAP).The corresponding separation efficiency and capacity were subject to the key factors such as the composition and pore structure of the carrier,the active species and the loading amount of the active component(e.g.,Pd)in the separation material.Therefore,it is of great scientific significance and practical application value to explore the novel preparation method and structure-performance relationship of new hydrogen isotope separation materials.A series of modified alumina matrix composites were prepared by oil column molding using the self-made organic template(T)-SiO_(2) combined modification method.The modified alumina carrier had three advantage merits:low bulk density,large pore volume and high crushing strength,which effectively solved the problem that traditional spherical alumina was difficult to have both low bulk density and high crushing strength.Various techniques,such as X-ray powder diffraction(XRD),low-temperature nitrogen adsorption and desorption(Brunauer-Emmett-Teller,BET),scanning electron microscopy(SEM),and X-ray photoelectron spectroscopy(XPS),were used to characterize the alumina-based materials in details.The effects of template T and SiO_(2) addition on the physical properties and microstructure of spherical alumina were systematically investigated.Furthermore,the palladium-loaded alumina hydrogen isotope separation material was prepared under control.The modified alumina was used as the carrier to support 30%(mass
作者
张港
李殿卿
冯拥军
纪富豪
叶小球
Zhang Gang;Li Dianqing;Feng Yongjun;Ji Fuhao;Ye Xiaoqiu(State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Science and Technology on Surface Physics and Chemistry Laboratory,China Academy of Engineering Physics,Mianyang 621908,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2023年第8期1088-1103,共16页
Chinese Journal of Rare Metals
基金
总装国防科技重点实验室基金项目(6142A02190206)
总装科技稳定支持项目(WDZC202103)资助。
