Preparation of WO3/TiO2-ZrO2 catalyst for selective catalytic reduction and mechanism of NH3 activation

WANG Longfei; ZHANG Yaping; GUO Wanqiu; SHEN Kai; ZHENG Pengfei; YANG Linjun

doi:10.11949/j.issn.0438-1157.20150277

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Preparation of WO₃/TiO₂-ZrO₂ catalyst for selective catalytic reduction and mechanism of NH₃ activation

更新时间：2025-12-10

- Preparation of WO₃/TiO₂-ZrO₂ catalyst for selective catalytic reduction and mechanism of NH₃ activation
- CIESC Journal Issue 10, Pages: 3903-3910(2015)
- 作者机构：
  
  1. 东南大学能源与环境学院, 能源热转换及其过程测控教育部重点实验室,江苏,南京,210096
  2. 郑州大学化工与能源学院,河南,郑州,450000
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20150277
  CLC： 643.36
- Online First：05 October 2015，
  
  Published：05 October 2015
- 稿件说明：
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WANG Longfei, ZHANG Yaping, GUO Wanqiu, et al. Preparation of WO₃/TiO₂-ZrO₂ catalyst for selective catalytic reduction and mechanism of NH₃ activation[J]. CIESC Journal, 2015, (10): 3903-3910. DOI: 10.11949/j.issn.0438-1157.20150277.
DOI：

WANG Longfei, ZHANG Yaping, GUO Wanqiu, et al. Preparation of WO₃/TiO₂-ZrO₂ catalyst for selective catalytic reduction and mechanism of NH₃ activation[J]. CIESC Journal, 2015, (10): 3903-3910. DOI: 10.11949/j.issn.0438-1157.20150277. DOI：

摘要

采用共沉淀法制备了WO3/TiO2-ZrO2脱硝催化剂

并用固定床反应器进行活性评价

采用BET、XRD、TPD、氨气吸附漫反射FT-IR进行表征。结果显示

ZrO2掺杂增强了TiO2的Lewis酸性;负载WO3之后

位于3.1~1.7 nm之间孔隙的稳定性显著增强;NH3的吸附与活化分别由TiO2-ZrO2载体和WO3完成;WO3中W元素强大的电负性

促进了NH3的N—H键由共价键向离子键过渡

进而导致了NH3的活化。脱硝活性结果显示:当WO3含量为9%(质量)时

催化剂脱硝活性最高

并在320~420℃的温度窗口保持94%以上。(9%)WO3/TiO2-ZrO2具有更加稳定的孔隙结构(4.4~1.7 nm)

表面Brønsted酸中心数量增加

Lewis酸中心的强度和酸量增加的幅度最大

NH3-SCR过程中的活性中间产物NH2的吸收峰更加明显

这些特征可能是其脱硝活性最好的原因。

Abstract

(x)WO3/TiO2-ZrO2 catalysts with different WO3 content were prepared by the impregnation method and the catalytic performance for the selective catalytic reduction of NOx with NH3 (NH3-SCR) was investigated in a fixed-bed stainless steel reactor. The catalysts were characterized by BET

XRD

NH3-TPD and in situ DRIFTS analysis of NH3 adsorption

and revealed the change of the structural property and acidic capacity. The characterization results showed that WO3 was in a well-dispersed state and WO3 addition enhanced the thermal stability of catalysts obviously. The adsorption and activation of NH3 were caused by TiO2-ZrO2 and WO3

respectively. It was found that W displayed a huge electronegativity and prompted the transfer of the N—H bond of NH3 from covalent bond to ionic bond

which could incur the NH3 activation. The results of catalytic activity indicated that the catalyst with 9%(mass) WO3 content exhibited 94% NO conversion within the wide temperature range of 320℃ to 420℃. (9%)WO3/TiO2-ZrO2 possessed comparatively higher intensity of Lewis acidity and larger amount of Brønsted acidity as well as more stable pore structure (4.4—1.7 nm). Besides

the absorption peak of the active intermediate species NH2 was more obvious. All these characters probably accounted for its better catalytic performance.

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