Cr对工业V-Mo/Ti脱硝催化剂的毒化作用研究

doi:10.19964/j.issn.1006-4990.2020-0543

Abstract

Abstract:

Industrial V-Mo-Cr/Ti catalysts loaded with different amounts of Cr₂O₃ were prepared by impregnation method.XRD,N₂-adsorption,NH₃-TPD,Raman,H₂-TPR and XPS were used to characterize the catalysts.Afterwards,the denitri-fication performance of the different catalysts was tested through a fixed-bed microreactor.It was found that Cr₂O₃ loaded on industrial V-Mo/Ti denitration catalysts had little impact on the pore properties of catalyst.By comparison with V-Mo/Ti cat-alyst,V-Mo-Cr/Ti catalyst presented more amount of acid sites.However,due to the influence of Cr₂O₃,the reduction perfor-mance of the catalyst was lower and the content of chemical adsorbed oxygen was less.V-Mo-Cr/Ti catalysts exhibited relative lower NO_x conversion and higher N₂O generation in the temperature range of 250 ℃ to 430 ℃ than that of the V-Mo/Ti cata-lyst.

Key words: selective catalytic reduction, V-Mo/Ti, chromium oxide, denitration catalyst

CLC Number:

TQ136.11

Huang Li,Wang Hu,Zong Yuhao,Chang Zhengfeng,Liu Yang,Li Jinke,Han Pei. Study on deactivation effect of chromium on industrial V-Mo/Ti De-NO_x catalyst[J]. Inorganic Chemicals Industry, 2021, 53(8): 112-116.

Figures/Tables 8

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References 24

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催化剂	比表面积/ （m²·g^-1）	孔容/ （cm³·g^-1）	平均孔径/ nm
V-Mo/Ti	73.2	0.301	15.4
V-Mo-Cr（0.2）/Ti	70.8	0.285	16.1
V-Mo-Cr（0.5）/Ti	67.1	0.272	16.9

催化剂	n（V⁴⁺+V³⁺）/ n（V⁵⁺）	n（Mo⁶⁺）/ n（Mo⁵⁺+Mo⁶⁺）	n（O_α）/ n（O_α+O_β）	n（Cr³⁺）/ n（Cr⁶⁺）
V-Mo/Ti	1.64	0.97	0.11	—
V-Mo-Cr（0.2）/Ti	1.60	0.96	0.09	0.92
V-Mo-Cr（0.5）/Ti	1.58	0.97	0.06	0.93

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on deactivation effect of chromium on industrial V-Mo/Ti De-NO_x catalyst

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Study on deactivation effect of chromium on industrial V-Mo/Ti De-NOx catalyst