摘要
考察了水溶性 Ru/ Pt-TPPTS双金属催化剂催化卤代芳香硝基化合物的加氢性能 .实验结果表明 ,在Ru-TPPTS中添加铂或钯后 ,反应活性明显提高 ,尤其是 Ru/ Pt-TPPTS双金属催化剂更表现出显著的双金属协同效应 .在 p H2 =1 .0 MPa,70℃ ,反应 2 h的条件下 ,双金属催化剂 0 .5 0 Ru/ 0 .5 0 Pt-TPPTS催化对 -氯硝基苯加氢生成对 -氯苯胺的反应转化率达到 1 0 0 % .对于取代基和取代位置不同的一些卤代硝基苯加氢 ,该双金属催化剂也表现出很高的催化活性和生成卤代苯胺的选择性 。
Selective hydrogenation of halonitroaromatic compounds catalyzed by water-soluble bimetallic catalyst containing ruthenium and platinum in the aqueous/organic two-phase system was studied. It was found that the reaction rate increased obviously due to the addition of Pt and Pd. Ru/Pt-TPPTS bimetallic catalyst exhibits a strong synergic effect when the molar ratio of Ru to Pt is 1/1. Under the conditions of 70 ℃, p H 2=1.0 MPa, the conversion of p-Cl-C 6H 4NO 2 is 100% in the presence of Ru/Pt-TPPTS catalyst, which is higher than that of Ru-TPPTS or Pt-TPPTS, the selectivity of p-Cl-C 6H 4NH 2 is more than 99%. The catalyst also exhibits a high activity and selectivity for the hydrogenation of other haloaromatic nitro-compounds with different substituents and substituted positions. Meanwhile, the amount of dehalogenation product(aniline) is about 1%.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第5期884-887,共4页
Chemical Journal of Chinese Universities
关键词
卤代芳香硝基化合物
催化加氢
水溶性双金属催化剂
双金属协同效应
Water-soluble bimetallic catalyst
Catalytic hydrogenation
Halonitroaromatic compound
Bimetallic synergic effect
