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Effect of impregnation sequence of Pd/Ce/γ-Al2O3 sorbents on Hg0 removal from coal derived fuel gas.
Chemosphere ( IF 8.1 ) Pub Date : 2020-02-10 , DOI: 10.1016/j.chemosphere.2020.126164 Qihuang Huo 1 , Caixia Yue 2 , Yahui Wang 1 , Lina Han 3 , Jiancheng Wang 1 , Shuai Chen 4 , Weiren Bao 1 , Liping Chang 1 , Kechang Xie 1
Chemosphere ( IF 8.1 ) Pub Date : 2020-02-10 , DOI: 10.1016/j.chemosphere.2020.126164 Qihuang Huo 1 , Caixia Yue 2 , Yahui Wang 1 , Lina Han 3 , Jiancheng Wang 1 , Shuai Chen 4 , Weiren Bao 1 , Liping Chang 1 , Kechang Xie 1
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This study attempted to investigate the effect of impregnation sequence of the Pd/Ce/γ-Al2O3 sorbents on Hg0 removal. To this end, five kinds of sorbents were prepared and tested in simulated coal derived fuel gas (N2-H2-CO-H2S-Hg), including Pd/γ-Al2O3, Ce/γ-Al2O3 and three kinds of Pd-based sorbents with Ce impregnation on γ-Al2O3 substrate. The tests were conducted at 250 and 300 °C respectively. According to the results, bimetallic Ce-Pd/γ-Al2O3 sorbent prepared by simultaneously impregnating Pd and Ce showed much higher and more stable removal efficiency of Hg0 than the other three kinds of sorbents. The Hg0 removal efficiency of Ce-Pd/γ-Al2O3 sorbent reached above 98% within 480 min at 250 °C and 91% within 200 min at 300 °C. Characterization results indicated that the sorbent Ce-Pd/γ-Al2O3 prepared by the co-impregnation method had bigger specific surface area (216.6 m2/g) than the other three kinds of Pd-based sorbents. The content Pd and Ce on the sorbent Ce-Pd/γ-Al2O3 surface is 0.21% and 0.61%, which proved higher than that of the other three kinds of Pd-based sorbents, and observation from STEM-XEDS maps showed it demonstrated the highest dispersion. It is found that Ce is likely to promote the dispersion of Pd on the support surface during the preparation of the sorbent under the co-impregnation method. Meanwhile, Ce enhanced the H2S resistance of the sorbent. Thereby, Ce-Pd/γ-Al2O3 sorbent is found to have the optimal performance of mercury removal. In this study, the Hg0 removal mechanism of the Pd/Ce/γ-Al2O3 sorbents in the simulated coal derived fuel gas was also elaborated.
中文翻译：
Pd / Ce /γ-Al2O3吸附剂的浸渍顺序对煤制燃料气中Hg0去除的影响。
这项研究试图研究Pd / Ce /γ-Al2O3吸附剂的浸渍顺序对Hg0去除的影响。为此，制备了五种吸附剂并在模拟煤衍生燃料气体（N2-H2-CO-H2S-Hg）中进行了测试，包括Pd /γ-Al2O3，Ce /γ-Al2O3和三种基于Pd的吸附剂Ce浸渍在γ-Al2O3衬底上。测试分别在250和300°C下进行。根据结果，同时浸渍Pd和Ce制备的双金属Ce-Pd /γ-Al2O3吸附剂比其他三种吸附剂显示出更高，更稳定的Hg0去除效率。Ce-Pd /γ-Al2O3吸附剂的Hg0去除效率在250°C的480分钟内达到98％以上，在300°C的200分钟内达到91％以上。表征结果表明，共浸渍法制备的Ce-Pd /γ-Al2O3吸附剂比其他三种Pd基吸附剂的比表面积（216.6 m2 / g）更大。Ce-Pd /γ-Al2O3吸附剂表面的Pd和Ce含量分别为0.21％和0.61％，证明高于其他三种基于Pd的吸附剂，并且通过STEM-XEDS图谱观察表明，最高分散。发现在共浸渍法制备吸附剂的过程中，铈可能促进Pd在载体表面上的分散。同时，铈增强了吸附剂的抗H2S性能。因此，发现Ce-Pd /γ-Al2O3吸附剂具有最佳的除汞性能。在这个研究中，
更新日期：2020-02-10
中文翻译：
Pd / Ce /γ-Al2O3吸附剂的浸渍顺序对煤制燃料气中Hg0去除的影响。
这项研究试图研究Pd / Ce /γ-Al2O3吸附剂的浸渍顺序对Hg0去除的影响。为此，制备了五种吸附剂并在模拟煤衍生燃料气体（N2-H2-CO-H2S-Hg）中进行了测试，包括Pd /γ-Al2O3，Ce /γ-Al2O3和三种基于Pd的吸附剂Ce浸渍在γ-Al2O3衬底上。测试分别在250和300°C下进行。根据结果，同时浸渍Pd和Ce制备的双金属Ce-Pd /γ-Al2O3吸附剂比其他三种吸附剂显示出更高，更稳定的Hg0去除效率。Ce-Pd /γ-Al2O3吸附剂的Hg0去除效率在250°C的480分钟内达到98％以上，在300°C的200分钟内达到91％以上。表征结果表明，共浸渍法制备的Ce-Pd /γ-Al2O3吸附剂比其他三种Pd基吸附剂的比表面积（216.6 m2 / g）更大。Ce-Pd /γ-Al2O3吸附剂表面的Pd和Ce含量分别为0.21％和0.61％，证明高于其他三种基于Pd的吸附剂，并且通过STEM-XEDS图谱观察表明，最高分散。发现在共浸渍法制备吸附剂的过程中，铈可能促进Pd在载体表面上的分散。同时，铈增强了吸附剂的抗H2S性能。因此，发现Ce-Pd /γ-Al2O3吸附剂具有最佳的除汞性能。在这个研究中，
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