本文采用MD模拟研究了分别含有Al3+,Cu2+和La3+等金属离子的中孔分子筛MCM41在较大温度范围内对水的吸附情况,通过考察水分子在孔内的局部平均密度分布,发现含有Al3+和La3+的MCM41对水有较好的吸附性能,表现在吸附量提高和脱附温度降低.我们认为其吸附性能提高的主要原因在于引入金属离子导致了壁面极性增加,增加了吸附表面的活性点,改变了壁面分子结构等几个方面.
参考文献
| [1] | Xia Q H;Hidajat K;Kawi S .Improvement of the Hydrothermal Stability of Fluorinated MCM-41 Material[J].Materials Letters,2000,42:102-107. |
| [2] | S. Kawi;S.-C. Shen .Effects of structural and non-structural Al species on the stability of MCM-41 materials in boiling water[J].Materials Letters,2000(1/2):108-112. |
| [3] | S.Velu;L.Wang;M.Okazaki;K.Suzuki;S.Tomura .Characterization of MCM-41 mesoporous molecular sieves containing copper and zinc and their catalytic performance in the selective oxidation of alcohols to aldehydes[J].Microporous and Mesoporous Materials,2002(1/2):113-126. |
| [4] | Kuang YP.;Wang J.;Xiao PF.;Yuan CW.;Lu ZH.;He NY. .Investigating the state of Fe and La in MCM-41 mesoporous molecular sieve materials[J].Colloids and Surfaces, A. Physicochemical and Engineering Aspects,2001(2/3):177-184. |
| [5] | Zheng S;Gao L .Synthesis and Characterization of Pt, Au or Pd Clusters Deposited Titania-Modified Mesoporous Silicate MCM-41 Mater[J].Chemical Physics,2002,78:512-517. |
| [6] | Allinger N L .Conformational Analysis 130, MM2 - A Hydrocarbon Force Field Ultilizing V1 and V2 Torsional Terms[J].Journal of the American Chemical Society,1977,99:8127-8134. |
| [7] | Bambrough CM.;Williams RT.;Burkett SL.;Sims SD.;Mann S.;Slade RCT. .Sorption of nitrogen, water vapor, and benzene by a phenyl-modified MCM-41 sorbent[J].Journal of Colloid and Interface Science,1998(2):220-222. |
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