CAJ | 학술논문

采用分步浸渍法和共浸渍法制备系列Pd负载质量分数为1%的Pd-Cu/γ-Al2 O3双金属催化剂，以氢气为还原剂研究其对水中硝酸盐催化脱除的性能。结果表明，催化剂中Cu与Pd物质的量比以及Cu、Pd的浸渍顺序对催化剂性能有重要影响，硝酸根转化率随着Cu与Pd物质的量比的增大而增大；硝酸根转化活性以Cu与Pd物质的量比为5：1、先浸渍Pd再浸渍Cu所得催化剂较优；从氨氮选择性方面看，以先浸渍Cu后浸渍Pd制备的催化剂选择性较低，在Cu与Pd物质的量比为1：1、先浸渍Cu再浸渍Pd所得催化剂较优。
채용분보침지법화공침지법제비계렬Pd부재질량분수위1%적Pd-Cu/γ-Al2 O3쌍금속최화제，이경기위환원제연구기대수중초산염최화탈제적성능。결과표명，최화제중Cu여Pd물질적량비이급Cu、Pd적침지순서대최화제성능유중요영향，초산근전화솔수착Cu여Pd물질적량비적증대이증대；초산근전화활성이Cu여Pd물질적량비위5：1、선침지Pd재침지Cu소득최화제교우；종안담선택성방면간，이선침지Cu후침지Pd제비적최화제선택성교저，재Cu여Pd물질적량비위1：1、선침지Cu재침지Pd소득최화제교우。
A series of Pd-Cu/γ-Al2 O3 bimetallic catalysts with Pd mass fraction of 1% was prepared by stepwise impregnation method and co-impregnation method. The performance of the catalysts for nitrate removal from water was investigated using hydrogen as the reducing agent. The experimental results showed that Cu/Pd molar ratios in the catalysts and the of impregnation sequence Cu and Pd had impor-tant influence on the performance of the catalysts for nitrate removal from water. The conversion of nitrates was enhanced with the increase of Cu/Pd molar ratios over all the catalysts. The nitrate conversion activity of the catalyst prepared by stepwise impregnation of first palladium and then copper was best when Cu/Pd molar ratio equalled 5:1 . The catalysts prepared by stepwise impregnation of first copper and then palla-dium had lower selectivity to ammonium ,and the catalytic properties of the catalyst with Cu/Pd molar ratio of 1:1 was better.