CAJ | 학술논문

针对 Pd / Al2 O3催化剂载体的改性进行研究，将1000℃焙烧后的氧化铝粉末与未焙烧的活性氧化铝粉末按不同比例混合和焙烧制备载体，采用等体积浸渍法制得负载 Pd 的 Pd / Al2 O3催化剂。采用 XRD、BET、NH3- TPD 和 HOT 对载体以及催化剂进行表征，并考察催化剂的蒽醌加氢性能。结果表明，提高载体中焙烧后氧化铝粉末的比例，导致载体中γ- Al2 O3减少和δ- Al2 O3增多，载体酸性降低，Pd 分散度变大，从而提高了催化剂氢化效率。当焙烧后氧化铝质量分数为40％时，分散度和活性表面积达到最大，晶粒度最小，氢化效率最高，催化活性最佳。
침대 Pd / Al2 O3최화제재체적개성진행연구，장1000℃배소후적양화려분말여미배소적활성양화려분말안불동비례혼합화배소제비재체，채용등체적침지법제득부재 Pd 적 Pd / Al2 O3최화제。채용 XRD、BET、NH3- TPD 화 HOT 대재체이급최화제진행표정，병고찰최화제적은곤가경성능。결과표명，제고재체중배소후양화려분말적비례，도치재체중γ- Al2 O3감소화δ- Al2 O3증다，재체산성강저，Pd 분산도변대，종이제고료최화제경화효솔。당배소후양화려질량분수위40％시，분산도화활성표면적체도최대，정립도최소，경화효솔최고，최화활성최가。
The support modification of Pd / Al2 O3 catalysts was focused on. The support was prepared by mixing activated alumina powder calcined at 1 000 ℃ and activated alumina powder without calcination in different proportion and calcining. Pd / Al2 O3 catalysts were prepared by impregnation method and their performance for anthraquinone hydrogenation was evaluated. The supports and Pd / Al2 O3 catalysts were characterized by XRD,BET,NH3-TPD and H2-O2 titration. The results showed that when the proportion of calcined alumina powder in the support was increased,γ-Al2 O3 decreased and δ-Al2 O3 increased in the support,which resulted in reduction of the support acidity,improvement of Pd dispersion on the catalyst and enhancement of the hydrogenation efficiency of the catalyst. When the mass fraction of calcined alumina was 40% ,Pd dispersion and active surface of Pd / Al2 O3 catalyst reached maximum,its crystal size was minimum,and the hydrogenation efficiency and catalytic activity of Pd / Al2 O3 catalyst were the best.