Characterization of Supported Ni-B Amorphous Alloy Catalysts

Chinese Journal of Physico-Chemical Chemistry Zheng Zhengyi, Ma Aigneng, Mu Xuhong, Yan Enze, Huang Xiaoxi 1 Wang Rong 1 Research Institute of Petrochemical Science, Beijing 100083, China; 1 Beijing University of Science and Technology, Beijing 100083, China Subject code B0302n is a new type of catalytic hydrogenation. Materials, amorphous alloys have high activity and selectivity, which has caused people's lives in recent years and has increased the prospect of industrial applications of amorphous alloy catalysts. The literature has reported studies on the preparation chemistry of supported amorphous alloy catalysts and the deactivation and sulfur resistance of catalysts with structural modification catalytic properties. 23. It should be said that compared to the ultrafine particles prepared by quenching and chemical reduction methods. Amorphous alloys, loaded to effectively improve the thermal stability of amorphous alloys.

However, when the supported amorphous alloy catalyst is used in the catalytic reaction, there is still a gradual change in the structure. 4. In this paper, 2 is a model compound, and the heat treatment of the supported amorphous alloy structure in a different atmosphere is studied. Impact.

1 Experimental section 1.1 Preparation of the catalyst 3,2 area 464 holes 1.824.8 grain size 2 mesh for my body, using the impregnation method to contain 1 old 4 reduction preparation of 3,2; product of the gold catalyst.

1.2 Various Atmosphere Treatments for Catalyst Preparation of Supported Amorphous Alloy Catalysts Prepared by Atmosphere Treatment 1 Roasted in a Muffle Oven at Different Temperatures 4.012 Pure High Purity Nitrogen Purity 99.99 Treated Catalysts at Different Temperatures 4.03 High Purity Hydrogen Purity 99.99 at Different Temperatures Under the treatment of catalyst 4.014300, 1 into the hydrogen and sulfur-containing gas enthalpy of the enthalpy, steam sulfur content of 46 plants to take different time analysis of defects in the structure of 纟1.

1.3 The composition and loading of the catalyst of the catalyst were determined by a 4:00 type inductively coupled plasma direct reading spectrometer. The bulk structure of the catalyst was determined by the 050050 German company, which was confirmed by a ray diffractometer, and was used for the transmission of electrons. Scatter mirror 1 and. , 022010 type high-resolution electron microscopy order 01 observation while using the election area electronic stone Xie 6 India to determine the crystal + structure.

2 Results and Discussion Old 1 妃 1 ray diffraction pattern. As a result of ribbing, except for the presence of 40 carrier sonic peaks at 29=22, a broad diffuse peak appears at 29=45, confirming that Yang 8 is an amorphous alloy, and the peak intensity increases with increasing load. . Analyze the catalyst's enthalpy 1. With the negative one, the composition of the catalyst tends to be 15 and this is similar to the literature. Palm, barrier, phoenix, dew, but, er, V602. Cong, 200, There was no obvious diffraction peak in the pretreated samples. With the increase of the processing temperature, the crystallization peaks of 0 and crystallization began to appear in the 300-treated samples. With the increase of the heating temperature, the peak intensity and the peaks of the crystals gradually decreased. However, literature reports 6 that ultra-fine amorphous alloys were heat-treated at 200°C, and the crystal phase peaks of 28 and 38 were observed on the amorphous backplate, indicating that the loading is indeed beneficial to the stability of amorphous alloys. 3 is the 0 sample after high temperature nitrogen treatment at different temperatures after crystallization or nano grain growth. At 400, the relative height of the 0 peak is significantly reduced. Increased peak; 4 after hydrogen treatment. The spectrum of the sample shows that at 400 or less, it increases to 29 as the reduction temperature increases. In the reduction of 450, there is a clear crystallization peak; 300, the Sinus spectrum of the sample after sulfur treatment is similar to the spectrum of the sample treated with hydrogen in the sample. In fact, in hydrodesulfurization, the amorphous alloy is in a hydrogen atmosphere.

The changes in the phase of the catalyst under air and nitrogen gas are very significant for the study of non-typed gold-catalyzed catalysts. The spectra obviously cannot be regenerated by conventional redox methods. The change from amorphous to crystalline is irreversible.

In general, the amorphous alloy prepared by the chemical reduction method of mountain surface is covered by the oxide of silver, and the spectrum is very different from that of the spectrum. The use of 1 P1 can effectively resolve this structural change.

The electron diffraction spectrum of the fresh sample is mainly amorphous diffuse ring of 5, and the bright-loaded Cu 3 is present in amorphous form. However, the diffraction ring of 5 oxides still appears in the matrix, which is also known as 5,0. The resolution of the electron microscope confirmed. The 6-image observation shows that the grain size is nanometer-scale, the crystal lattice structure is calibrated to be 0 crystal, and the crystal material of 483 is calibrated at the same time.

After analysis of the hydrogen spectrum, the three samples of hydrogen in the hydrogen atmosphere were sampled. After hydrogen, there were two kinds of crystalline forms in the sample, which were amorphous nickel and polycrystalline nickel. Research on the catalytic performance of amorphous hydrogenation of acetylene on the selective hydrogenation of acetylene in ethylene has been found. It is now advantageous to the activity of the catalyst 7. To out 1 to distinguish this 1 crystal on the nanoscale.

Type morphology, particle size is a few nanometers, bright amorphous alloy dispersed in the form of nanoparticles on the carrier, its corresponding electron diffraction spectrum is an amorphous diffraction ring; and after the sulfur is a sample of small particles attached to the large particles above The morphology of the corresponding electron diffraction spectrum, in addition to the amorphous diffraction ring, also shows a polycrystalline ring. The particle size of the treated 5 catalyst particle grows to 10, 16 and 10, and the particle reaches hundreds of nanometers. stronger. The diffraction results of 50 samples after the calibration were plate and plate crystal compounds, respectively. The appearance of this sulphide is beneficial to hydrodesulfurization. 5 Conclusions The research shows that the load rejection 5 produced by the chemical reduction method is mainly amorphous. There is also a small amount of 141; the body, and the presence of 0 crystals. In the air nitrogen atmosphere, the phase of the 3,0-OHC catalyst significantly changed, while under the hydrogen condition, the amorphous structure changed significantly at 45°C, indicating that the catalyst 1 is more likely to remain amorphous under the hydrogen atmosphere. status.

709p Li Hui Li Hexing, Deng Jingfa. Proceedings of the 9th National Conference on Catalysis, Beijing 1997094 1996 Ma Azeng, Postdoctoral Research Paper, Beijing Institute of Petroleum and Chemical Sciences, 19舛