凹凸棒石复合氧化钙脱硫剂脱除SO_2的试验研究

采用甘肃临泽产凹凸棒石(ATTP)与CaO复合,制成了具有吸附催化作用的脱硫剂。实验主要研究了CaO含量、脱硫剂含水率、床层温度对脱硫效率的影响。试验结果表明,CaO含量为20%～30%,脱硫剂含水率在20%～30%、床层温度为常温时,凹凸棒石基新型脱硫剂脱硫效果最好,硫容最大可达17.12%。

Preparation and Characterization of a New Desulfurizer and Its Performance on Removal of SO₂

Sulfur dioxide is one of the major pollutants resulting from fuel combustion. In this study, CaO and attapulgite were utilized as raw material for synthesizing CaO/attapulgite (CaO/ATP) desulfurizer. The physicochemical characteristics of CaO/ATP desulfurizer were evaluated by various techniques such as XRD, SEM, FT-IR. The performance of samples was studied in dynamic conditions. Major factors affecting on desulfurization such as weight ratio of CaO to total, types of modifiers, roasting time and temperature were investigated. The desulfurization agent synthesized under optimal synthesis conditions with CaO content of 30 wt% and NaOH modifier, and the desulfurization roasting time of 2 hours and roasting temperature of 600°C, exhibit sulfur tolerance of 10.15 wt%. This desulfurizer with excellent absorbency and catalysis of desulfurization, economical and?environment-friendly, could be especially useful in industrial applications.

负载MgO-CeO_(2)改性活性炭的脱硫机理

通过XRD、H2-TPR、XPS等方法对MgO-CeO_(2)改性的煤基柱状成型商品活性炭的脱硫机理进行了研究。实验结果表明:高温煅烧改性,使MgO与CeO_(2)反应形成Ce-Mg-O固溶体,当MgO质量分数低于5%时,因固溶体的形成,XRD谱图上没有明显的MgO晶体衍射峰。MgO的加入改变了CeO_(2)的还原环境,加速了Ce^(4+)→Ce^(3+)的还原和氧空位的形成,其中4Ce6Mg/AC样品还原性最强。推测其脱硫机理为:SO_(2)因活性炭优良的吸附性能直接吸附;SO_(2)被CeO_(2)活性位点催化氧化,以硫酸盐的形式除去;SO_(2)被MgO活性位点化学吸附,以亚硫酸盐的形式除去;镁铈双金属氧化物之间存在协同效应,促进了晶格氧的迁移转化,显著增强了改性样品的脱硫性能。