An in situ reduction method has been developed to fabricate metallic Ag nanoparticles inside the channels of mesoporous carbon CMK-3. This approach combines function of the CMK-3 surface by oxidation using HNO3 with the subsequent absorption of Ag^＋ The resultant nanocomposite materials were characterized by nitrogen adsorption, X-ray diffraction, Auger electron spectroscopy and transmission electron microscopy. Compared with the conventional impregnation method, our approach shows that Ag nanonarticles of 2-4 nm can be uniformlv incorporated into CMK-3.
Ai Bing Chen Wei Ping Zhang Yong Liu Xiu Wen Han Xin He Bao
分别采用氘代吡啶和三甲基膦为探针分子,利用高分辨固体核磁共振技术研究了HZSM-35分子筛与探针分子之间的相互作用以及分子筛的酸性.结果表明,探针分子氘代吡啶能够进入分子筛的十元环孔道和八元环孔道,但需在300℃下长时间吸附才能扩散到八元环开口的孔穴中.吸附氘代吡啶后的1H MAS NMR谱和吸附三甲基膦后的31P MAS NMR谱表明,这两种孔道中均具有两种酸强度不同的B酸位,并且B酸的数量多于L酸的数量.
