Effluence of modification on the deep desulfurization behavior of NaY and Na13X zeolite for thiophene
首发时间:2016-08-12
Abstract:NaY and Na13X zeolites were modified by different modification manners, which are H+ modification, metal ion (copper, nickel or cerium ions) modification and H+ modification followed by metal ion modification, to prepare series of sorbents. The properties of these sorbents were measured by XRD, N2 adsorption and SEM/EDS. The desulfurization activity of these sorbents was evaluated in a model gasoline made of thiophene and cyclohexane, and the results were compared to investigate the effect of preparation methods on adsorption desulfurization behavior. The results show that H+ modification or metal ion modification could all improve the desulfurization efficiency of both NaY and Na13X zeolites, however, for Na13X, after modified by copper or nickel ions, its crystal structure was destroyed, and thus the desulfurization efficiency is much lower than before. The desulfurization activity of the sorbents prepared via H+ modification followed by metal ion modification is higher than that of sorbents prepared by single H+ modification or metal ion modification because pre-modification by H+ can increase the metal content, specific surface and pore volume of sorbent in the following metal ion modification process. Compared with Na13X, NaY is more suitable for H+ modification followed by metal ion modification. Among those prepared sorbents, the CuHY sorbent prepared via NaY modified via H+ and followed by copper ion, has the highest desulfurization efficiency at room temperature.
keywords: thiophene desulfurization sorbent modification Y zeolite
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酸改性和金属离子改性对NaY和Na13X分子筛吸附脱除噻吩性能的影响
摘要:选取了NaY和Na13X分子筛作为研究对象,分别对其进行了酸改性(氢离子)、过渡金属离子(铜离子和镍离子)和稀土金属离子(铈离子)改性以及酸和金属离子的先后改性,制得了一系列吸附剂。在由噻吩和环己烷所配制的模拟汽油中,用静态吸附实验考察了上述改性对NaY和13X分子筛脱硫性能的影响。结果表明除Cu2+、Ni2+改性13X外,酸改性和金属离子改性能提高吸附剂的脱硫效率,XRD结果表明Cu2+、Ni2+改性会破坏13X的晶体结构从而导致吸附剂的脱硫效率显著降低。酸和金属离子的先后改性较单纯的酸改性或金属离子改性所制得吸附剂的金属离子含量高,从而使得吸附剂具有较高的脱硫效率。其中NaY分子筛先经过酸改性,再经过Cu2+改性所制得的CuHY吸附剂的脱硫效率最高。
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No.4701979111638614****
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酸改性和金属离子改性对NaY和Na13X分子筛吸附脱除噻吩性能的影响
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