haohan氢同位素分析三氧化二铝填充柱MnCL2/γ-AL2O3

吸附活性太强的γ-Al2O3将导致氢同位素各组分保留时间延长、色谱峰拖尾、选择性差异不明显,从而无法满足快速在线分析需求。

为此,采用锰盐浸渍沉积法改性γ-Al2O3,制备了一种可在液氮温度下分析氢同位素的MnCl2\γ-Al2O3色谱填料,并对其形貌、比表面积、孔径、孔体积、吸附性能及氢氘分离性能进行研究。

与改性前的γ-Al2O3填料相比,本填料吸附活性适中,表面均匀,具有优良的孔结构和选择吸附性能,堆密度增大了44.8%,比表面积减小了11.4%,孔径在0.7～4.0nm分布,改善了单纯γ-Al2O3表面有序度、孔结构和吸附性质,降低了表面活性。MnCl2非均匀磁场的存在加速了正仲氢转化,使正仲氢合二为一,能够有效分离He,H2,HD和D2混合气体,谱图中各组分峰型对称,接近标准高斯分布;H2与HD分离度达到0.94,HD与D2分离度达到1.78,对稳定氢同位素的保留时间在2min内,分离度和柱效均优于未经改性的γ-Al2O3。
 

名称：改性氧化铝填充柱
规格：4m*3mm
型号：MnCL2/γ-AL2O3，60-80目

应用：氢同位素测定

The strong adsorption activity of γ-Al2O3 will cause the retention time of the hydrogen isotopes to be prolonged, the chromatographic peak tailing, and the selectivity difference is not obvious, which cannot meet the needs of fast online analysis.

For this reason, γ-Al2O3 was modified by manganese salt impregnation deposition method, and a MnCl2\γ-Al2O3 chromatographic packing that can analyze hydrogen isotope at liquid nitrogen temperature was prepared, and its morphology, specific surface area, pore size, and pore volume were prepared. , Adsorption performance and hydrogen deuterium separation performance are studied.

Compared with the γ-Al2O3 filler before modification, this filler has moderate adsorption activity, uniform surface, excellent pore structure and selective adsorption performance, bulk density increased by 44.8%, specific surface area decreased by 11.4%, and pore size was 0.7 The ～4.0nm distribution improves the surface order, pore structure and adsorption properties of pure γ-Al2O3, and reduces the surface activity. The existence of the MnCl2 non-uniform magnetic field accelerates the conversion of para-hydrogen and makes the two-para-hydrogen combination into one, which can effectively separate He, H2, HD and D2 mixed gas, and the peak shape of each component in the spectrum is symmetrical, which is close to the standard Gaussian distribution; The resolution of H2 and HD reached 0.94, the resolution of HD and D2 reached 1.78, the retention time of stable hydrogen isotopes was within 2 minutes, and the resolution and column efficiency were better than those of unmodified γ-Al2O3.

Name: Modified alumina packed column
Specification: 4m*3mm
Model: MnCL2/γ-AL2O3, 60-80 mesh

Application: hydrogen isotope determination