铜锰氧化物催化低浓度甲醛动力学模型研究

doi:10.19964/j.issn.1006-4990.2022-0515

Abstract

Abstract:

CuO/MnO₂as a typical air purification material was selected and a test experimental system was built with reference to ASHRAE standards to investigate its performance in removing low concentrations of formaldehyde.The physical and chemical properties and structures of the catalysts before and after the reaction were also characterized by FT-IR，SEM，XRD and XPS.The experimental results showed that the efficiency of the CuO/MnO₂ catalyst for the removal of indoor formaldehyde at typical concentration levels［（0.3~1.0）×10^-6］ in a typical indoor environment（25 ℃，50% RH） reached 80%.The efficiency of CuO/MnO₂ in removing indoor formaldehyde was significantly affected by concentration and temperature.Among them，the reaction temperature had the greatest impact on the decomposition rate of formaldehyde，and the higher the temperature，the higher the decomposition rate of formaldehyde.The copper-manganese catalyst was able to achieve 60% removal efficiency for typical indoor formaldehyde concentration levels with good stability over a longer period of time（20 h） at room temperature.The MVK model could better describe the catalytic oxidation of formaldehyde by CuO/MnO₂ catalysts.The above results showed that the stability of CuO/MnO₂ catalyst was good，and coupled with its regenerative nature，the catalyst had a wide application in the catalytic oxidation of formaldehyde at low concentrations and room temperature，such as indoors.

Key words: CuO/MnO₂, indoor air quality, low concentration formaldehyde, mechanistic model

CLC Number:

TQ132.21

WANG Zhiqiang, LIU Xiangcheng, ZHANG Junjie, JIN Wufeng. Study on kinetic model of low concentration formaldehyde catalyzed by copper-manganese oxide[J]. Inorganic Chemicals Industry, 2023, 55(6): 142-150.

Figures/Tables 14

Fig.1

Table 1

Table 2

Fig.2

Table 3

Fitting of univariate（surface concentration Cs） kinetic model"

模型	反应速率公式	温度/℃	k/（10^-42m·s^-1）	K/10⁶	k′/（10^-6m·s^-1）	A/（10⁹m^-1·s）	R²
一阶模型	$r = k' C s$	25	—	—	0.303	—	0.179
一阶模型	$r = k' C s$	60	—	—	0.320	—	0.179
L-H	$r = k K C s / 1 + K C s 2$	25	250.083	0.001	—	—	0.178
L-H	$r = k K C s / 1 + K C s 2$	60	294.005	0.001	—	—	0.178
MVK	$r = k' C s / 1 + k' A C s$	25	—	—	0.017	-25.367	0.941
MVK	$r = k' C s / 1 + k' A C s$	60	—	—	0.018	-24.022	0.941

Table 3

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

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催化剂	填充厚度/mm	进气浓度/10^-6	催化温度/℃	初始去除效率/%	穿透时间/h
CuO/MnO₂-1	13	0.196	25	70.7	19.9
CuO/MnO₂-2	13	0.304	25	77.9	18.4
CuO/MnO₂-3	13	0.406	25	83.7	19.4
CuO/MnO₂-4	13	0.502	25	88.5	19.4
CuO/MnO₂-5	13	0.304	25	77.9	18.3
CuO/MnO₂-6	13	0.304	30	82.8	19.0
CuO/MnO₂-7	13	0.304	40	84.0	18.4
CuO/MnO₂-8	13	0.304	50	86.8	19.4
CuO/MnO₂-9	13	0.304	60	89.7	16.9
CuO/MnO₂-10	3	0.199	40	72.3	19.9
CuO/MnO₂-11	3	0.334	40	72.5	18.4
CuO/MnO₂-12	3	0.607	40	70.9	19.4
CuO/MnO₂-13	3	1.130	40	70.7	16.9
CuO/MnO₂-14	3	1.153	40	71.4	17.6

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Inorganic Acid-Base-Salt Committee of CIESC

Study on kinetic model of low concentration formaldehyde catalyzed by copper-manganese oxide

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