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Arsine adsorption in copper-exchanged zeolite under low temperature and micro-oxygen conditions

机译：低温和微氧气条件下铜交换沸石中的胂吸附

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摘要

Arsenic pollution is a worldwide issue. Nearly all arsenic is converted to arsine (AsH3) under the reducing atmosphere required for the gasification process. Growing industrialization has increased AsH3 emissions, for example, the ore smelting process leads to AsH3 emissions. The conditions used in the ore smelting process are low temperature and micro-oxygen. A series of H beta zeolites loaded on different metal oxides has been prepared using an impregnation method and tested for adsorption of arsine (AsH3) under low temperature and micro-oxygen conditions. Based on the results obtained from the adsorbent optimization experiments, H beta zeolite modified with Cu(NO3)(2) (denoted as Cu/H beta) was found to possess a significantly enhanced adsorption removal ability towards arsine. The effects of the impregnation concentration, calcination temperature, reaction temperature, and oxygen content on the AsH3 removal process were investigated. The results indicate that adsorbents with 0.2 mol L-1 Cu(NO3)(2) after calcination at 400 degrees C have superior activity for AsH3 removal. In addition, a breakthrough capacity of 43.7 mg AsH3/g adsorbent at 60 degrees C as well as 1.0% oxygen was observed with Cu/Hb for the AsH3 adsorption process. The structure and surface properties of the H beta zeolite samples were characterized by N-2-BET (N-2 adsorption/desorption), XRD (X-ray powder diffraction), XPS (X-ray photoelectron spectroscopy), and FTIR (Fourier transform infrared) spectroscopy. It is feasible that the exhausted Cu/H beta can be regenerated by thermal desorption, and the adsorbents can be recycled at least two times with little capacity loss.
机译：砷污染是一个全世界的问题。几乎所有砷都在气化过程所需的还原气氛下转化为胂（ASH3）。越来越多的工业化增加了ASH3排放，例如，矿石冶炼过程导致ASH3排放。矿石冶炼过程中使用的条件是低温和微氧。使用浸渍方法制备装载在不同金属氧化物上的一系列Hβ沸石，并在低温和微氧条件下测试胂（Ash3）的吸附。基于从吸附剂优化实验获得的结果，发现用Cu（NO 3）（2）改性的Hβ沸石（表示为Cu / Hβ）具有显着提高胂的吸附去除能力。研究了浸渍浓度，煅烧温度，反应温度和氧含量对ASH3去除过程的影响。结果表明，在400℃煅烧后，具有0.2 mol L-1 Cu（2）的吸附剂具有优异的ASH3去除活性。另外，用Cu / Hb为ASH3吸附过程，观察到60℃下的43.7mg Ash3 / g吸附剂的突破容量和1.0％氧。 Hβ沸石样品的结构和表面性质的特征在于N-2-BET（N-2吸附/解吸），XRD（X射线粉末衍射），XPS（X射线光电子谱）和FTIR（傅立叶变换红外线）光谱。可以通过热解吸再生排气的Cu / hβ可行，并且吸附剂可以至少回收两次，几乎没有容量损失。

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  • 来源
    《RSC Advances》 |2017年第89期|共10页
  • 作者

    Wang Xueqian; Zhang Yingjie; Ning Ping; Yan Shudi; Wang Langlang; Ma Qiang;

  • 作者单位

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Yunnan Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Yunnan Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Yunnan Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Yunnan Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Yunnan Peoples R China;

    Kunming Univ Sci &

    Technol Fac Environm Sci &

    Engn Kunming 650500 Yunnan Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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