Desulfurization mechanisms of ions diffusion of synthetic CaO sorbents using co-precipitation method

WANG Lin; GAO Jihui; CHE Hongwei; JING Xinjing; LI Yang; LUO Zhi

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Desulfurization mechanisms of ions diffusion of synthetic CaO sorbents using co-precipitation method

更新时间：2025-09-28

- Desulfurization mechanisms of ions diffusion of synthetic CaO sorbents using co-precipitation method
- Thermal Power Generation Vol. 46, Issue 9, Pages: 124-129(2017)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 哈尔滨工业大学能源科学与工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC： X773
- Published：2017
- 稿件说明：
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WANG Lin, GAO Jihui, CHE Hongwei, et al. Desulfurization mechanisms of ions diffusion of synthetic CaO sorbents using co-precipitation method[J]. Thermal power generation, 2017, 46(9): 124-129.
DOI：

WANG Lin, GAO Jihui, CHE Hongwei, et al. Desulfurization mechanisms of ions diffusion of synthetic CaO sorbents using co-precipitation method[J]. Thermal power generation, 2017, 46(9): 124-129. DOI：

摘要

利用共沉淀法设计制备了晶格内掺有不同半径杂离子的CaO吸收剂

研究了杂离子类型对脱硫反应的影响;基于离子晶体内原子扩散的空位缺陷理论

获得了掺杂不同半径离子对硫化产物层离子扩散影响的整体规律

并利用傅氏转换红外线光谱分析仪(扫描电子显微镜)和X射线衍射仪对掺有不同半径杂离子的CaO吸收剂进行分析。结果表明:掺杂Ba~(2+)后的CaO吸收剂脱硫性能最佳

而掺杂Mg~(2+)的效果最差;设计样品中实现了杂离子与Ca~(2+)原子水平的掺混;杂原子掺入引起了CaO相应的晶格畸变

大半径杂离子能增加晶体中的空位点缺陷数量

提高吸收剂脱硫性能

而小半径杂离子则对产物层固态离子扩散无促进作用。

Abstract

By co-precipitation method

CaO sorbents in which Ca~(2+) and hetero-ion(with different radius) were mixed in the crystalline lattice were prepared.The effect of hetero-ion type on desulfurization reaction was studied.On the basis of the vacancy defect theory in solid-state ions diffusion

the comprehensive rules about ion-doping promoting ion diffusion in sulfated product layer were obtained.The Fourier transform infrared spectroscopy(FTIR) and X-ray diffractometer were used to analyze the desulfurization performance of each sample.The result show that

the samples mixed with Ba~(2+) has the best desulphurization performance

while that with Mg~(2+) has the worst.The dopant ions were successfully mixed with Ca~(2+) at atom level.The dopant ions brought in lattice distortion.It concluded that the dopant ions which have a larger radius can increase the number of space point defects and improve the desulfurization ability of the sample

but the smaller radius dopant ions have no positive effect.

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