应用吸附-热催化工艺从污染气流中去除 BTX。
Application of an adsorptive-thermocatalytic process for BTX removal from polluted air flow.
机构信息
Department of Environmental Health Engineering, Semnan University of Medical Sciences, School of Health, Semnan, Iran.
Department of Environmental Health Engineering, Iran University of Medical Sciences, School of Health, Tehran, Iran.
出版信息
J Environ Health Sci Eng. 2014 May 28;12:89. doi: 10.1186/2052-336X-12-89. eCollection 2014.
BACKGROUND
Zero valent iron and copper oxide nanoparticles (30-60 nm) were coated on a bed of natural zeolite (Clinoptilolite) with 1-2 mm grains and arranged as a dual filter in a stainless steel cylindrical reactor (I.D 4.5 cm and L = 30 cm) to investigating the coated bed removal efficiency for BTX. The experiments were conducted in three steps. First, with an air flow of 1.5 L/min and temperature range of 38 (ambient temperature) to 600°C the BTX removal and mineralization was surveyed. Then, in an optimized temperature the effect of flow rate and pollution loading rate were surveyed on BTX removal.
RESULTS
The BTX removal at 300 and 400°C were respectively up to 87.47% and 94.03%. Also in these temperatures respectively 37.21% and 90.42% of BTX mineralization were achieved. In the retention times of 14.1 s and 7.05 s, respectively 96.18% and 78.42% of BTX was removed.
CONCLUSIONS
According to the results, this adsorptive-thermocatalytic process with using Clinoptilolite as an adsorbent bed and combined Fe(0) and Cu2O nanoparticles as catalysts can be an efficient and competitive process in the condition of high flow rate and high pollution loading rate with an adequate process temperature of 350°C.
背景
零价铁和氧化铜纳米颗粒（30-60nm）涂覆在天然沸石（斜发沸石）床上，沸石颗粒大小为 1-2mm，并在不锈钢圆柱形反应器（内径 4.5cm，长 30cm）中排列成双滤床，以研究涂覆床对 BTX 的去除效率。实验分三步进行。首先，在空气流速为 1.5L/min，温度范围为 38°C（环境温度）至 600°C 的条件下，考察了 BTX 的去除和矿化情况。然后，在优化的温度下，考察了流速和污染负荷率对 BTX 去除的影响。
结果
在 300°C 和 400°C 时，BTX 的去除率分别高达 87.47%和 94.03%。此外，在这两个温度下，BTX 的矿化率分别达到了 37.21%和 90.42%。在保留时间分别为 14.1s 和 7.05s 时，BTX 的去除率分别达到了 96.18%和 78.42%。
结论
根据结果，该吸附-热催化工艺使用斜发沸石作为吸附床，结合 Fe(0)和 Cu2O 纳米颗粒作为催化剂，可以在高流速和高污染负荷率的条件下，在 350°C 的适宜工艺温度下，成为一种高效、有竞争力的工艺。
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