CAJ | 학술논문

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,MnO_x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.
이도각회(RHA)위재체,채용등체적침지법제비료MnO_x/RHA최화제,재상압고정상반응기상,고찰료제비조건대MnO_x/RHA최화양화NO활성적영향,채용XRD、SEM、EDX화XRF등방법대최화제특정급제비조건적영향진행료분석.통과대최화제특정적분석발현,MnO_x주요이무정형과립상부재재RHA내표면화단면상;제단소시간외,제비조건대최화제활성유현저영향.통과대최화제급RHA표면미관형모화조분적분석발현,수착단소온도승고,RHA표면MnO_x과립척촌증대,MnO_x정체함량증가,당단소온도유200℃ 상승도650℃시,MnO_x과립립경유0.1 μm증대도1.0 μm.수착회화온도승고,RHA표면결구유평판상향소송봉와상화세사상전변.
Rice husk ash (RHA) was used as support to synthesize MnO_x/RHA catalyst by incipient wetness impregnation.The influence of preparation conditions on the activity of MnO_x/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 MnO_x 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 MnO_x and the fraction of crystalline MnO_x increased.When the calcination temperature was raised from 200℃ to 650℃, the particle size of MnO_x was 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.