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首页> 外文期刊>Environmental Science & Technology >Photocatalytic Degradation of Methanol Using Silica-Titania Composite Pellets: Effect of Pore Size on Mass Transfer and Reaction Kinetics
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Photocatalytic Degradation of Methanol Using Silica-Titania Composite Pellets: Effect of Pore Size on Mass Transfer and Reaction Kinetics

机译：二氧化硅-二氧化钛复合颗粒光催化降解甲醇：孔径对传质和反应动力学的影响

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摘要

Nanostructured silica-titania composites (STC) synthesized with varying pore sizes (45,134, and 299 A) were tested for the removal of methanol from a humid air stream. The STC pellets were characterized for surface area and pore size distribution and tested in a packed-bed photocatalytic reactor for methanol removal and oxidation. While the pore size distributions for all STC were unimodal, STC with larger average pore sizes exhibited a broader pore size distribution. The efficiency of methanol oxidation was dependent on the surface area of the STC and the space time of the gas in the reactor. For all STC tested, the rate of methanol oxidation was not limited by resistances to external or internal mass transfer. For 134 and 299 A STC, a lag time of 1.0 and 1.2 s, respectively, was observed before mineralization began. After this lag time, which was zero for the 45 A STC, the data followed pseudo first-order reaction kinetics and the rate constant, k, was 0.40 s~(-1) for all pore sizes.
机译：测试了具有不同孔径（45,134和299 A）的纳米结构的二氧化硅-二氧化钛复合材料（STC）从潮湿气流中去除甲醇的能力。对STC粒料进行表面积和孔径分布表征，并在填充床光催化反应器中进行甲醇去除和氧化测试。尽管所有STC的孔径分布均为单峰，但平均孔径较大的STC的孔径分布较宽。甲醇氧化的效率取决于STC的表面积和反应器中气体的时空。对于所有测试的STC，甲醇的氧化速率不受外部或内部传质阻力的限制。对于134和299 A STC，在开始矿化之前观察到分别为1.0和1.2 s的滞后时间。在这个滞后时间（对于45 A STC为零）之后，数据遵循伪一级反应动力学，速率常数k在所有孔径下均为0.40 s〜（-1）。

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  • 来源
    《Environmental Science & Technology》 |2008年第10期|p.3808-3813|共6页
  • 作者

    JENNIFER M. STOKKE; DAVID W. MAZYCK;

  • 作者单位

    Department of Environmental Engineering Sciences, University of Florida, PO Box 116450, Gainesville, FL 32611;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
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