Preparation of A/X-type and X-type molecular sieves from fly ash and their CO<sub>2</sub> adsorption properties

XU Lei; WANG Hongzhi; SUN Hanlei; YAO Shuo; LIU Licheng

doi:10.12434/j.issn.2097-2547.20250153

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Preparation of A/X-type and X-type molecular sieves from fly ash and their CO₂ adsorption properties

更新时间：2026-02-13

- Preparation of A/X-type and X-type molecular sieves from fly ash and their CO₂ adsorption properties
- Vol. 51, Issue 2, Pages: 117-126(2026)
- 作者机构：
  
  中国海洋大学化学化工学院，山东青岛 266100
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20250153
  CLC： TQ424
- Received：03 April 2025，
  
  Revised：2025-05-13，
  
  Published：25 February 2026
- 稿件说明：
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徐磊,王虹智,孙菡蕾等.粉煤灰制备A/X型和X型分子筛及其CO₂吸附性能[J].低碳化学与化工,2026,51(2):117-126.

XU Lei,WANG Hongzhi,SUN Hanlei,et al.Preparation of A/X-type and X-type molecular sieves from fly ash and their CO₂ adsorption properties[J].Low-Carbon Chemistry and Chemical Engineering,2026,51(2):117-126.
徐磊,王虹智,孙菡蕾等.粉煤灰制备A/X型和X型分子筛及其CO₂吸附性能[J].低碳化学与化工,2026,51(2):117-126. DOI： 10.12434/j.issn.2097-2547.20250153.

XU Lei,WANG Hongzhi,SUN Hanlei,et al.Preparation of A/X-type and X-type molecular sieves from fly ash and their CO₂ adsorption properties[J].Low-Carbon Chemistry and Chemical Engineering,2026,51(2):117-126. DOI： 10.12434/j.issn.2097-2547.20250153.

摘要

工业废料资源化利用是可持续发展领域的重要课题，其中粉煤灰的高值化利用尤为重要。以青岛（Q）和淄博（Z）某热电厂两种不同硅铝比（

(Si)/

(Al)分别为2.29和1.42）的粉煤灰为原料，采用碱熔融-水热法合成分子筛用于CO

吸附。采用XRD、XRF和SEM等手段表征了粉煤灰、分子筛的组成及结构特性，并结合单因素实验确定了最优处理及合成条件，研究了碱灰比（质量比）、液固比（质量比）和晶化时间等对合成A/X型和X型分子筛的影响。结果表明，由于粉煤灰硅铝比不同，最优处理及合成条件不同。在碱灰比1.6:1、液固比8:1和晶化6 h的最优条件下，粉煤灰Q合成的X型分子筛比表面积为532.7 m

/g，其动态和静态CO

吸附量分别达到2.77 mmol/g和4.42 mmol/g，显著优于最优条件下粉煤灰Z合成的A/X型分子筛（281.2 m

/g、1.57 mmol/g和3.95 mmol/g）。吸附动力学研究表明，两种分子筛的CO

吸附过程均以物理吸附为主，其中X型分子筛经过10次循环后仍保持了首次吸附时85%以上的CO

吸附量。粉煤灰硅铝比是决定分子筛性能的关键因素，相关结论可为粉煤灰制备高性能分子筛吸附剂提供参考。

Abstract

Resource utilization of industrial wastes is an important topic in the field of sustainable development

among which the high value-added utilization of fly ash is particularly important. Fly ash with different Si/Al ratios (

(Si)/

(Al) of 2

.29 and 1.42

respectively) from two thermal power plants in Qingdao (Q) and Zibo (Z) was used as raw material. Molecular sieves for CO

adsorption were synthesized by the alkali fusion-hydrothermal method. XRD

XRF and SEM were employed to characterize the composition and structural properties of fly ash and molecular sieves. In combination with one-factor experiments

the optimal treatment and synthesis conditions were determined

and the effects of alkali-to-ash ratio (mass ratio)

liquid-to-solid ratio (mass ratio) and crystallization time on the synthesis of A/X-type and X-type molecular sieves were investigated. The results show that

due to the different Si/Al ratios of the fly ashes

the optimal treatment and synthesis conditions also differ. Under the optimal conditions of an alkali-to-ash ratio of 1.6:1

a liquid-to-solid ratio of 8:1 and a crystallization time of 6 h

the X-type molecular sieve synthesized from fly ash Q exhibits a specific surface area of 532.7 m

with dynamic and static CO

adsorption capacities of 2.77 mmol/g and 4.42 mmol/g

respectively. These values are significantly higher than those of the A/X-type molecular sieve synthesized from fly ash Z under its optimal conditions (281.2 m

1.57 mmol/g and 3.95 mmol/g

respectively). Adsorption kinetics studies indicate that the CO

adsorption process of both molecular sieves is dominated by physical adsorption. The X-type molecular sieve maintains over 85% of its initial CO

adsorption capacity after 10 adsorption/desorption cycles. The Si/Al ratio of fly ash is identified as the key factor determining the performance of the molecular sieves. These findings provide a reference for the preparation of high-performance molecular sieve adsorbents from fly ash.

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Preparation of A/X-type and X-type molecular sieves from fly ash and their CO2 adsorption properties

DOI：10.12434/j.issn.2097-2547.20250153

摘要

Abstract

关键词

Keywords

references

Preparation of A/X-type and X-type molecular sieves from fly ash and their CO₂ adsorption properties