Effect of Ca/P ratio on catalytic oxidation of dichloromethane over Ru/hydroxyapatite catalysts

WAN Jiguo; XU Li; WANG Yu

doi:10.13205/j.hjgc.202501019

Volume 43 Issue 1

Mar. 2025

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WAN Jiguo, XU Li, WANG Yu. Effect of Ca/P ratio on catalytic oxidation of dichloromethane over Ru/hydroxyapatite catalysts[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(1): 175-184. doi: 10.13205/j.hjgc.202501019

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WAN Jiguo, XU Li, WANG Yu. Effect of Ca/P ratio on catalytic oxidation of dichloromethane over Ru/hydroxyapatite catalysts[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(1): 175-184. doi: 10.13205/j.hjgc.202501019

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Effect of Ca/P ratio on catalytic oxidation of dichloromethane over Ru/hydroxyapatite catalysts

doi: 10.13205/j.hjgc.202501019

WAN Jiguo¹,
XU Li^{1,2
,},
WANG Yu^1
,

1. College of Resources and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;
2. Shanwei Innovation Industrial Design & Research Institute, Shanwei 516600, China

Received Date: 2023-10-09
Accepted Date: 2024-03-27
Rev Recd Date: 2024-01-02

Available Online: 2025-03-21

Publish Date: 2025-03-21

Abstract

Abstract

Catalytic oxidation is the most effective way to treat CVOCs. At present, the core difficulties in making efficient CVOCs catalysts are achieving high activity, resistance to chlorine poisoning and resistance to high temperature sintering. In this experiment, a series of hydroxyapatite (HAP(X), X refers to the Ca/P molar ratio) with different Ca/P molar ratios were prepared by liquid phase deposition method, and then ruthenium (Ru) was loaded on the surface of HAP(X) by urea homogeneous deposition precipitation method to prepare the Ru/HAP(X) catalyst. As shown by the results of XRD, FT-IR, SEM, TEM, H₂-TPR, NH₃-TPD, etc., Ru nanoparticles were highly dispersed on the surface of HAP, and Ru/HAP(1.67) exhibited the best low-temperature reducibility, as well as the richest medium and strong acid sites. The catalytic oxidation activity, selectivity, and stability of Ru/HAP(X) for dichloromethane (DCM) were investigated by taking DCM as typical chlorine-containing VOCs. The investigation result indicated that Ru/HAP(1.67) had the best catalytic oxidation performance and good stability for DCM. The Ca/P molar ratio had a significant effect on the distribution of by-products in the DCM reaction. Monochloromethane, an incomplete decomposition product, was detected in Ru/HAP (1.50) because of its strong acidity. With the increase in Ca/P molar ratio, trichloromethane and tetrachloromethane were the main by-products of Ru/HAP(1.60) and Ru/HAP(1.67). The research results provide references for industrial application of CVOCs catalytic oxidation and high value-added utilization of phosphorus resources.
- dichloromethane,
- hydroxyapatite,
- catalytic oxidation,
- ruthenium,
- acid site

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References

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