Synthesis of spherical-like Pt-MCM-41 meso-materials with high catalytic performance for hydrogenation of nitrobenzene.
Spherical-like Pt-MCM-41 meso-materials, including Pt-MCM-41, Pt-Al-MCM-41, and Pt-La-MCM-41, as well as MCM-41, were synthesized by a "one-step" approach with orthosilicate (TEOS) as silica source and cetyltrimethylammonium bromide (CTAB) as a template in the presence of suitable H(2)SO(4) (or HCl) at 0 degrees C. The samples were characterized by XRD, N(2) sorption, FTIR, SEM, TEM, ICP-AES, and XPS techniques. The results show that the metallic cations (such as Al(3+) and La(3+)) were hard to be incorporated into the synthesized samples under strong acidic conditions. However, H(2)PtCl(6) can be introduced almost 100% in the as-synthesized Pt-containing meso-materials, and H(2)PtCl(6) in the samples can be decomposed mostly into metallic Pt accompanied by part Pt(2)Si and few Pt oxides during the calcination at 550 degrees C to remove the template. In the catalytic hydrogenation of nitrobenzene, the calcined Pt-MCM-41 meso-materials, like the corresponding reduced samples, exhibit high catalytic activities with an excellent selectivity to aniline, which are much better than those of the reduced Pt/MCM-41 prepared by the incipient wetness method.
Liu
Huiping
H
Key Laboratory for Advanced Materials and Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, People's Republic of China.
Lu
Guanzhong
G
Guo
Yun
Y
Wang
Yanqin
Y
Guo
Yanglong
Y