Preparation Of Ni-W-B Amorphous Catalysts And Their Hydrodeoxygenation Performance

With the development of industrialization and urbanization, two prominent problemsof energy crisis and environmental pollution have increasingly emerged in the process ofsustainable development. Under the pressure of these two issues, the key point of solutionis to develop new renewable energy. Biomass, as the greatest potential for renewableenergy, has been concerned. Bio-oil, which is generated by the fast pyrolysis of biomass,has highly oxygen content. This affects the quality of the bio-oil, which makes it to formthe characteristics of low calorific value, poor physical and chemical properties, and astrong corrosive, resulting in its obstruction of extensive use. Based on its disadvantages,the hydrodeoxygenation for the biological oil is very significant, while the most importantprocess in the hydrodeoxygenation is to find high hydrodeoxygenation activity catalysts.Amorphous alloy catalyst, as a new environmental and friendly catalyst, is able to bewidely used in social production, especially in the hydrogenation reaction for the uniquenature of the characteristics.This dissertation is to study the production of the Ni-W-B amorphous catalyst bychemical reduction. Used the surface area （BET）, X-ray diffraction （XRD）, X-rayphotoelectron spectroscopy （XPS） to detect the resulting catalysts. Besides, thecharacteristics of adding La, Ce, Cr to the Ni-W-B amorphous catalyst and itshydrodeoxygenation, as well as the effect of the additives La, Ce content to the amorphouscatalyst and its catalytic activity have been studied in this paper.The results of the experiment conclude that the different types of the preparedcatalysts are all amorphous structure. W was not the reduction of NaBH4, and still waspresented as the WO3in the catalyst. When the reaction temperature reached to548K, theamorphous structure of the prepared catalyst has been changed into the crystallinestructure. The amorphous catalysts in catalytic reactions exhibit higherhydrodeoxygenation activity, meanwhile, the addition of modifiers La, Ce, Cr can enhancethe deoxidizing activity of the catalyst, but the addition of modifier Cr cannot significantlyimprove the increase of the catalyst hydrogen activity.In addition, the effect of La and Ce content in production of Ni-W-B amorphouscatalyst and hydrodeoxygenation has also been discussed in this dissertation. The resultsindicate that the addition of a certain amount of La in the Ni-W-B amorphous catalyst canimprove the content of Ni0of the catalyst. The specific surface area of catalyst becomes larger and then smaller with the gradual increase of La content, while the catalysthydrogen deoxidation activity also vary with the increase of La. The catalyst prepared bythe ratio La³⁺: W⁶⁺=50:1000has the best quality of hydrodeoxygenation activity of phenol.The addition modifier Ce in the Ni-W-B amorphous catalyst can make the catalyst surfacearea first smaller and then larger. The catalyst prepared by the ratio Ce3+: W6+=25:1000has the best quality of hydrodeoxygenation activity of p-cresol.