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Study on Supercritical Fluid Preparation of Supported Ni Catalyst

Author: ZhangZuo
Tutor: XuSanKui
School: Henan University of Technology
Course: Materials Science
Keywords: supercritical fluid Ni/Al2O3catalyst glucose hydrogenation catalyticactivity doping
CLC: TQ426
Type: Master's thesis
Year: 2013
Downloads: 29
Quote: 0
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Abstract


In this paper, we prepared a supported Ni/Al2O3catalyst by supercritical CO2impregnation technique, using supercritical CO2as impregnation medium, active aluminumoxide as catalyst carrier and Ni （NO3）2as active precursor, and studied the hydrogenationperformance of the supported Ni-based catalyst based on glucose hydrogenation reactionmodel. We studied the effects of the temperature and pressure of CO2fluid, the reaction time,the mass ratio of the active precursor and carrier, kinds of the cosolvent, the cosolvent amountand the reduction temperature on the Ni loading amount as well as the activity of the catalyst.The results showed that the supercritical CO2impregnation method could effectively improvethe Ni loading amount in comparison with the conventional water impregnation method so asto improve the catalytic activity of the supported Ni/Al2O3catalyst. In the experiment range,the catalyst had the optimum Ni loading amount under the conditions of supercritical CO2temperature60℃, pressure8MPa, reaction time3h, methanol cosolvent0.5ml, and at areduction temperature of600℃, the catalyst had the best activity, which was1.65times of thecatalyst prepared by the water impregnation method. The Ni/Al2O3catalyst samples werecharacterized by XRD、SEM、BET、XPS、TG、DTA. The results showed that the supportedNi/Al2O3catalyst, prepared by supercritical CO2impregnation technique, had a larger Niloading amount, the active component Ni had a well distributed on the carrier aluminumoxide, between Ni and the catalyst carrier had a strong interaction force, so the Ni/Al2O3catalyst had a better hydrogenation performance.Make a preliminary exploration on the doped Ni-B/Al2O3catalyst. The results showedthat, for the glucose hydrogenation reaction, the introduction of B to the Ni/Al2O3catalyst inthe form of boric acid is bad to the catalytic activity. Taking potassium borohydride as thereducing agent to prepared Ni-B/Al2O3catalyst is good to the catalytic activity, which was1.76times of the Ni/Al2O3catalyst. The Ni-B/Al2O3catalyst has a smaller average particlessize of Ni, the active component Ni had a well distributed on the carrier aluminum oxide, theinteraction between the carrier and the active center is enhanced.Make a preliminary exploration on the rare earth element doping Ni/Al2O3catalyst. InLa、Nd、Ce、Sm four kinds of rare earth elements, doped La catalyst samples had the bestcatalytic activity. In the experiment range, at higher loadings of Ni （9.20%）cases, doped3%La, the catalyst had the best activity, which was1.36times of the undoped Ni/Al2O3catalyst. The Ni-La/Al2O3catalyst has a smaller average particles size of Ni, the active component Nihad a well distributed on the carrier aluminum oxide, the interaction between the carrier andthe active center is enhanced. At the same time, the addition of La can prevent Ni graingrowth and sintering, so it can improve the catalytic activity of the Ni/Al2O3catalyst.

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Catalyst ( catalyst )
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