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

摘要/Abstract

摘要：

采用浸渍法将不同含量的Cr₂O₃负载在工业V-Mo/Ti脱硝催化剂上,并通过XRD、NH₃-TPD、H₂-TPR、XPS、N₂-吸附脱附、拉曼光谱等手段对催化剂进行表征分析。使用固定床微型反应评价装置对不同催化剂进行了脱硝性能检测。结果表明：工业V-Mo/Ti脱硝催化剂上负载Cr₂O₃,对催化剂的孔结构影响较小;V-Mo-Cr/Ti催化剂与V-Mo/Ti催化剂相比具备更多的表面酸量。但由于受Cr₂O₃的影响,催化剂的还原性能较低,化学吸附氧含量较少。与V-Mo/Ti催化剂相比,V-Mo-Cr/Ti催化剂在250~430 ℃温度区间内的脱硝效率较低,N₂O生成量较多。

关键词: SCR, V-Mo/Ti, Cr₂O₃, 脱硝催化剂

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

中图分类号:

TQ136.11

黄力,王虎,纵宇浩,常峥峰,刘洋,李金珂,韩沛. Cr对工业V-Mo/Ti脱硝催化剂的毒化作用研究[J]. 无机盐工业, 2021, 53(8): 112-116.

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.

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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

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