Abstract The spent fluid catalytic cracking (SFCC) catalysts were activated by an “internal instant vaporization (IIV)” method and used in the removal of Hg0 from a simulated flue gas in a fixed bed reactor; the effect of various operation parameters such as the SFCC activation conditions, adsorption temperature, and flue gas components on the Hg0 removal efficiency was investigated. The results indicate that the SFCC catalyst activated with methanol or ethanol performs adequately in terms of Hg0 removal, whilst the calcination temperature also has a great influence on the activation of the SFCC catalyst. O2 in the flue gas favors the Hg0 removal, whilst NO facilitates the oxidation of mercury and displays a positive effect on the mercury removal in the presence of O2, accompanying with the formation of N-containing active species on the activated SFCC catalyst surface. SO2 in the flue gas, depending on its concentration, may exert the effect of catalytic adsorption or competitive adsorption on the Hg0 removal. Approximately 100% Hg0 can be removed in the stream of 6% O2, 12% CO2 and 0.06% NO at 120°C by using the activated SFCC catalyst with ethanol as an organic solvent and calcined at 120°C, suggesting that the spent FCC catalysts after activation can be a potential adsorbent for the removal of Hg0 from the coal-fired flue gas.

中文翻译：

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用活化的废 FCC 催化剂去除模拟燃煤烟气中的 Hg0

摘要 废流化催化裂化（SFCC）催化剂采用“内部瞬间汽化（IIV）”方法活化，用于固定床反应器模拟烟气中Hg0的脱除；研究了SFCC活化条件、吸附温度、烟气组分等各种操作参数对Hg0脱除效率的影响。结果表明，用甲醇或乙醇活化的 SFCC 催化剂在去除 Hg0 方面表现良好，而煅烧温度对 SFCC 催化剂的活化也有很大影响。烟气中的 O2 有利于 Hg0 的去除，而 NO 有利于汞的氧化，并在 O2 存在的情况下对汞的去除有积极的影响，伴随着在活化的 SFCC 催化剂表面上形成含氮活性物质。烟气中的 SO2 取决于其浓度，可能对 Hg0 的去除发挥催化吸附或竞争吸附的作用。使用活化的 SFCC 催化剂，以乙醇为有机溶剂并在 120°C 下煅烧，在 120°C 的 6% O2、12% CO2 和 0.06% NO 的气流中可以去除大约 100% Hg0，这表明用过的 FCC活化后的催化剂可以成为从燃煤烟气中去除 Hg0 的潜在吸附剂。