CAJ | 학술논문

通过水浴浸泡制备了磷钨酸( PWA)修饰的活性炭( PWA/C)，再通过液相还原法将Pd沉积于PWA/C复合载体上制备了Pd-PWA/C催化剂。采用X射线能量色散( EDS)谱、X射线衍射( XRD)谱、透射电子显微镜( TEM)和X射线光电子能谱( XPS)对产物进行表征。结果表明，磷钨酸修饰活性炭不仅能有效降低Pd纳米粒子的粒径，而且与Pd纳米粒子间发生了强烈作用。电化学测试结果显示， Pd-PWA/C催化剂对甲酸氧化的电催化活性和稳定性均远优于Pd/C催化剂，这是由于Pd与PWA/C间的强烈作用既能有效降低CO在催化剂上的吸附强度和吸附量，又能降低甲酸分解的速率，从而减弱CO的毒化作用。
통과수욕침포제비료린오산( PWA)수식적활성탄( PWA/C)，재통과액상환원법장Pd침적우PWA/C복합재체상제비료Pd-PWA/C최화제。채용X사선능량색산( EDS)보、X사선연사( XRD)보、투사전자현미경( TEM)화X사선광전자능보( XPS)대산물진행표정。결과표명，린오산수식활성탄불부능유효강저Pd납미입자적립경，이차여Pd납미입자간발생료강렬작용。전화학측시결과현시， Pd-PWA/C최화제대갑산양화적전최화활성화은정성균원우우Pd/C최화제，저시유우Pd여PWA/C간적강렬작용기능유효강저CO재최화제상적흡부강도화흡부량，우능강저갑산분해적속솔，종이감약CO적독화작용。
Activated carbon was modified with phosphotungstic acid( PWA) at 80 ℃ in a water bath, Pd was then loaded on the PWA/C hybrid support to prepare Pd-PWA/C catalyst by a simple impregnation-reduction method. The measurements of energy dispersive X-ray spectroscopy( EDS) , X-ray diffraction( XRD) pattern, transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS) indicate that phospho-tungstic acid-modified carbon not only decreases the average size of Pd nanoparticles effectively but also interacts with Pd nanoparticles strongly. The electrochemical measurements demonstrate that the electrocataly-tic activity and stability of the Pd-PWA/C catalyst for formic acid oxidation are much better than that of the Pd/C catalyst. It is due to that the strong interaction between Pd and PWA/C not only decreases the adsorp-tion strength and amount of CO at the catalyst electrode but also decreases the decomposition rate of formic acid to decrease the CO poisoning.