Xiao Fengshou

High-Temperature Synthesis of Zeolite Y

We hydrothermally synthesized sheet-like crystals of zeolite Y at high temperature (140 °C) using methyltriethoxysilane (MTS) as an additivity. Compared with the zeolite Y synthesized at 100 °C, the zeolite Y synthesized at high temperature has a high Si/Al ratio, a large crystalline width/thickness ratio and has good adsorption for organic volatile compounds. Characterization by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), 29Si nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR) spectroscopy, elemental analysis and water contact angle measurements suggests that the zeolite Y synthesized at high temperature contains methyl groups, which can be responsible for the improvement in sample hydrophobicity and adsorption capacity.

FORMYL: AN INTERMEDIATE FOR FORMATION OF OXYGENATES IN CO HYDROGENATION OVER SUPPORTED RUCO CARBONYL CLUSER-DERIVED CATALYSTS

The reaction and adsorption of syngas and paraformaldehyde on Ru-Co/SiO2 ca-talysts prepared from Ru-Co bimetallic carbonyl clusters have been investigated by infrared, mass spectroscopies. The spectra of reaction of CO+H-2 with Ru-Co/SiO2 catalysts showed a band appearing at 1584 cm(-1), which has a good relationship to the activity and selectivity for oxygenates in CO hydrogenation. Thus it was proposed that 1584 cm(-1) is a possible intermediate to produce oxygenated products. Isotopic tracer studies of D-2 and (CO)-C-13 suggest that 1584 cm(-1) can possibly be assigned to the formyl group, which is in good agreement with the adsorption of paraformaldehyde. The chemical trapping of 1584 cm(-1) adspecies provided an evidence to demonstrate that 1584 cm(-1) is attributed to formyl. The reaction of 1584 cm(-1) species with H-2 produced CH4 and CH3OH, and the introduction of D-2 into 1584 cm(-1) species resulted in the formation of CHD3 and CHD2OD.

Co-Mo/Al 2 O 3 和Ru-Co-Mo/Al 2 O 3 催化剂的不同表面钴中心表征

An investigation of the adsorption of no on reduced co-mo/al2o3 and ru-co-mo/al2o3 catalysts has been performed by using ir and ms spectros-copies, and it was found that two ir bands appeared at 1895 and 1880 cm(-1) in the ir spectra and three peaks exhibited at 353, 423 and 473 k in the tpd-ms profiles. these are attributed to the various co-sites on the surface of catalysts. comparing co-mo/al2o3 catalyst with ru-co-mo/al2o3 it was found that the addition of ru in ru-co-mo/al2o3 markedly led to an increase of the rate and amount for no adsorption, which may indicate that the hds activity of ru-co-mo/al2o3 was much higher than that of co-mo/al2o3 catalyst.利用IR、MS方法对还原态的Co-Mo/Al2O3和Ru-Co-Mo/Al2O3催化剂进行了考察。结果表明,还原态的Co-Mo/Al2O3和Ru-Co-Mo/Al2O3表面上存在着不同的Co中心。可以十分明显地观察到,在Co-Mo/Al2O3上,NO吸附的红外光谱显示了1895和1880cm-1谱带;在TPD-MS图上显示了353,423和473K谱峰。通过比较Co-Mo/Al2O3和Ru-Co-Mo/Al2O3,提出了在Ru-Co-Mo/Al2O3中Ru的加入主要是提高了NO在催化剂上的吸附速率和吸附量,增强吸附键的强度。更多还原