MnOx/RHA催化氧化NO制备工艺优化

化工学报 ›› 2010, Vol. 61 ›› Issue (2): 323-329.

• 催化、动力学与反应器 • 上一篇下一篇

MnO_x/RHA催化氧化NO制备工艺优化

高继慧，陈国庆，杜谦，徐莉莉，付晓林，秦裕琨

哈尔滨工业大学能源科学与工程学院

出版日期:2010-02-05 发布日期:2010-02-05

Optimizing preparation of MnOx/RHA for catalytic oxidation of NO

GAO Jihui, CHEN Guoqing, DU Qian, XU Lili, FU Xiaolin, QIN Yukun

Online:2010-02-05 Published:2010-02-05

摘要/Abstract

摘要：

以稻壳灰（RHA）为载体，采用等体积浸渍法制备了MnO_x/RHA催化剂，在常压固定床反应器上，考察了制备条件对MnO_x/RHA催化氧化NO活性的影响，采用XRD、SEM、EDX和XRF等方法对催化剂特征及制备条件的影响进行了分析。通过对催化剂特征的分析发现，MnO_x主要以无定形颗粒状负载在RHA内表面和断面上;除煅烧时间外，制备条件对催化剂活性有显著影响。通过对催化剂及RHA表面微观形貌和组分的分析发现，随着煅烧温度升高，RHA表面MnO_x颗粒尺寸增大，MnO_x晶体含量增加，当煅烧温度由200℃ 上升到650℃时，MnOx颗粒粒径由0.1 μm增大到1.0 μm。随着灰化温度升高，RHA表面结构由平板状向疏松蜂窝状和细丝状转变。

关键词:

催化氧化, 稻壳灰, 脱硫脱硝

Abstract:

Rice husk ash (RHA) was used as support to synthesize MnOx/RHA catalyst by incipient wetness impregnation.The influence of preparation conditions on the activity of MnOx/RHA for catalytic oxidation of NO was investigated in a fixed bed reactor.The nature, surface species and morphology of the catalyst were analyzed by XRD, SEM, EDX and XRF.It was found that most of MnOx supported on RHA was micron-size particle in the form of amorphous phase.The preparation conditions except for calcination time had a significant effect on the activity of catalyst.With increasing calcination temperature, both the particles size of MnOx and the fraction of crystalline MnOx increased.When the calcination temperature was raised from 200℃ to 650℃, the particle size of MnO_xwas increased from 0.1 μm to 1.0 μm.The surface structure of RHA was determined by ashing temperature.With increasing ashing temperature, the surface structure changed from plate to honeycomb and filamentous.

Key words:

催化氧化, 稻壳灰, 脱硫脱硝

高继慧, 陈国庆, 杜谦, 徐莉莉, 付晓林, 秦裕琨. MnO_x/RHA催化氧化NO制备工艺优化 [J]. 化工学报, 2010, 61(2): 323-329.

GAO Jihui, CHEN Guoqing, DU Qian, XU Lili, FU Xiaolin, QIN Yukun. Optimizing preparation of MnOx/RHA for catalytic oxidation of NO[J]. CIESC Journal, 2010, 61(2): 323-329.

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[2]	王瑞璞, 郭新闻, 王祥生. 直接催化氧化法合成环氧丙烷研究进展 [J]. 化工学报, 2003, 54(1): 2-8.

MnO_x/RHA催化氧化NO制备工艺优化

Optimizing preparation of MnOx/RHA for catalytic oxidation of NO

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