CAJ | 학술논문

采用阴离子交换树脂(AIER)为载体,以络合剂EDTA为媒介物,制备了Pd-Cu双金属负载性型催化剂;以H2为还原剂,将催化剂应用于水介质中NO3-还原为N2的脱除反应;考察了双金属催化剂组成、载体阴离子交换树脂的性质及水介质中NaCl存在对还原脱除反应的影响规律.研究结果表明,凭借阴离子交换树脂对EDTA强烈的吸附作用及EDTA对金属离子的强螯合作用,可将大量的金属离子(Cu2+与Pd2+)结合到树脂表面,再通过水合肼的还原作用,可制得金属负载量高且结合程度牢的双金属负载性型催化剂Pd-Cu/AIER.在单纯含有硝酸盐的水溶液中,在催化剂Pd-Cu/AIER的作用下,NO3-只能被还原为NH4+离子,不能还原为N2;水介质中大量氯离子的存在,能大大促进NO3-转变为N2的还原反应;载体阴离子交换树脂的碱性越弱,最终制得的催化剂活性与选择性越差.
채용음리자교환수지(AIER)위재체,이락합제EDTA위매개물,제비료Pd-Cu쌍금속부재성형최화제;이H2위환원제,장최화제응용우수개질중NO3-환원위N2적탈제반응;고찰료쌍금속최화제조성、재체음리자교환수지적성질급수개질중NaCl존재대환원탈제반응적영향규률.연구결과표명,빙차음리자교환수지대EDTA강렬적흡부작용급EDTA대금속리자적강오합작용,가장대량적금속리자(Cu2+여Pd2+)결합도수지표면,재통과수합정적환원작용,가제득금속부재량고차결합정도뢰적쌍금속부재성형최화제Pd-Cu/AIER.재단순함유초산염적수용액중,재최화제Pd-Cu/AIER적작용하,NO3-지능피환원위NH4+리자,불능환원위N2;수개질중대량록리자적존재,능대대촉진NO3-전변위N2적환원반응;재체음리자교환수지적감성월약,최종제득적최화제활성여선택성월차.
The loading-type Pd-Cu bimetal catalyst was prepared using anion exchange resin (AIER) as carrier and complex reagent EDTA as an intermedium. The as-prepared catalyst was used in reduction of nitrate in water to remove nitrate using H2 as reductant. The effects of the composition of bimetal, the property of the carrier and the presence of NaCl on the denitrification were investigated. The results showed that the metal ions (Cu2+and Pd2+) can be combined onto resin surface by the strong adsorption of AIER towards EDTA and the strong chelation of EDTA for metal ions. Via reduction of hydrazine hydrate for the metal ions, the loading-type catalyst Pd-Cu/AIER with high bimetal capacity and firm combination property were obtained. For the aqueous solution mere containing nitrate, NO3- only was reduced into NH4+ by the catalysis of Pd-Cu/ AIER. In the presence of higher concentration NaCl, the reduction of NO3-into N2 could be accelerated greatly. The activity and selectivity of the catalyst prepared is poorer if the weak alkaline anion exchange resins were used.