Interaction of gaseous hydrogen chloride and water with oxide surfaces
Interaction of gaseous hydrogen chloride and water with oxide surfaces
复制标题
气态氯化氢和水与氧化物表面的相互作用
DOI：
10.1016/0021-9797(79)90014-6
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发表时间：
1979
期刊：
影响因子：
--
通讯作者：
J. Wightman
中科院分区：
文献类型：
--
作者：
R. R. Bailey;J. Wightman
研究了温度、压力和出气条件对α-和γ-氧化铝吸附氯化氢和水蒸气的影响。通过x射线粉末衍射、扫描电镜（SEM）、低温氮吸附-解吸测量、BET氮表面积测量和化学分析电子能谱（ESCA）对吸附剂进行了表征。在80、200和400℃脱气后，测量了30、40和50℃时α-和γ-氧化铝的水蒸气吸附等温线。出气温度和吸附温度都影响水蒸气在氧化铝上的吸附。水蒸气吸附是完全可逆的，α-氧化铝单位面积吸附的水分多于γ-氧化铝。在有限的表面覆盖范围内测定了氧化铝上水蒸气的等容吸附热。在80,200和400°C放气后，测量了两种氧化铝在30,40和50°C时的氯化氢吸附等温线。同样，α-氧化铝比γ-氧化铝单位面积吸附更多的氯化氢。吸附过程是部分可逆的，表明是化学吸附过程。得到了两种氧化铝在氯化氢作用下的ESCA光谱。在不同浓度的水和盐酸溶液中测定浆料的pH值和氧化铝的浸没热，以补充气相测量。
The influence of temperature, pressure, and outgas conditions on the adsorption of hydrogen chloride and water vapor on both α- and γ-alumina has been studied. Characterization of the adsorbents was performed using X-ray powder diffraction, scanning electron microscopy (SEM), low-temperature nitrogen adsorption—desorption measurements, BET nitrogen surface area measurements, and electron spectroscopy for chemical analysis (ESCA). Water vapor adsorption isotherms at 30, 40, and 50°C were measured on α- and γ-alumina after outgassing at 80, 200, and 400°C. Both outgas temperature and adsorption temperature influenced the adsorption of water vapor on the aluminas. The water vapor adsorption was completely reversible, α-Alumina adsorbed more water per unit area than γ-alumina. Isosteric heats of adsorption for water vapor on the aluminas were determined over a limited range of surface coverage. Hydrogen chloride adsorption isotherms at 30, 40, and 50°C were measured on the two aluminas after outgassing at 80, 200, and 400°C. Again, α-alumina adsorbed more hydrogen chloride per unit area than γ-alumina. The adsorption was only partially reversible, indicative of a chemisorption process. ESCA spectra of both aluminas were obtained after exposure to hydrogen chloride. The pH of slurries and the heats of immersion of the aluminas, outgassed from 80 to 400°C, were determined in both water and hydrochloric acid solutions of varying concentrations to complement the vapor phase measurements.