噴霧熱分解法によるＮｉ／ＳｉＯ２触媒の調製

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  • Preparation of Ni/SiO2 catalyst by chemical fume thermal deposition.
  • フンム ネツ ブンカイホウ ニ ヨル Ni SiO2 ショクバイ ノ チョウセ

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Ni/SiO2 catalysts were prepared by chemical fume thermal deposition. This preparation proceeded as follows. Nickel-salt/methanol solution was sprayed into a tubular reactor with vaporized SiCl4 and air, and then the mixture was immediately pyrolyzed in a reactor whose temperature was controlled at 1573 K at the hottest point.<BR>The apparent diameter of the catalyst produced was estimated by the BET method, and the diameter of NiO, dNiO, x, was measured by XRD. The relationship between dNiO, x and the relative viscosity of sprayed solution, η, was represented by the following equation under the present experimental conditions.<BR>dNiO, x=k (η0.45) n<BR>where n and k are different for each case; n=1.48, k=19 nm for the [Ni (NO3) 2 /CH3OH+air+SiCl4] system, n=1.48, k=32 nm for the [NiCl2 /CH3 OH + air + SiCl4] system, n=0.64, and k=110 nm both for the [Ni (NO3) 2 CH3OH+air] system and the [NiCl2/ CH3OH+air] system.<BR>The apparent growth rate of the catalyst, γap, is proportional to the molar fraction of Ni salt, χ.<BR>γap=kapχ<BR>The reactivity of the catalyst was examined by the methanation of carbon mono-xide as a model reaction. The results show that the activity (TOF) was one or two magnitudes higher than those of conventionally prepared impregnated catalysts.

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