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개질된 NiO-TiO₂촉매상에서의 1-부텐의 이성화반응
손종락,이준희 경북대학교 공과대학 1987 工大硏究誌 Vol.16 No.-
The coprecipitate of Ni(OH)_2-Ti(OH)_4 was prepared by adding aqueous ammonia slowly into a mixed solution of nickel chloride and titanium chloride until the pH of mother liquor reached about 8. The precipitate Ti(OH)_4 was also perpared as above method using only titanium chloride solution. The dried sample was powdered 100mesh below and the 2g of powdered sample was treated with the solution of H_2SO_4, H_3PO_4, H_3BO_3, and H_2SeO_4. They were used as catalyst after decomposing at different evacuation temperature for 1.5hr. The time course of isomerization was in agreement with the first order rate law. NiO-TiO_2 modified with H_2SO_4 exhibited the highest catalytic activity for the 1-butene isomerization. The order of catalytic activity for the above reaction was found to be NiO-TiO_2/SO_4^-2>NiO-TiO_2/PO_4^-3>NiO-TiO_2/BO_3^-3>NiO-TiO_2/SeO_4^-2. TiO_2 modified with anions exhibited the same order catalytic activity as NiO-TiO_2. The order of catalytic activity of modified catalysts was in agreement with that of acid strength of catalysts, where the acid strength was examined by a color change method using Hammett indicators.
孫宗洛,韓堯翰 경북대학교 산업기술연구소 1987 産業技術硏究誌 Vol.14 No.-
The Chromium catalysts supported on silica for ethylene polymerization were prepared by mixing, impregnation, and coprecipitation methods and their catalytic activities were examined. As a consequence, it was found that both of co-precipitated and impregnated catalysts were very active, but mixed catalyst exhibited little catalytic activity. Co-precipitated and impregnated catalysts showed maximum polymerization activity under evacuation at 600℃ for 1 hr. The active site responsible for ethylene polymerization was proved to be Cr^3+ion, as evidenced by the relationship between variation of catalytic activity and CO reduction time, the color change in reduced catalyst, and the infrared spectra of adsorbed nitric oxide. The rates of polymerization were first order in ethylene pressure and the activation energy between - 40 and 0˚ was 0.32KJ/mol. On varing the ethylene pressure a linear relationship was found between catalytic activity and pressure. The catalyst was poisoned with sodium ion and its activity decreased with increase in the amount of sodium ion until 20 ppm.
Preparation and Characterization of NiO/CeO₂-ZrO₂/WO₃ Catalyst for Acid Catalysis
Sohn, Jong Rack,Han, Jong Soo 한국공업화학회 2005 Journal of Industrial and Engineering Chemistry Vol.11 No.3
A series of catalysts, NiO/CeO₂-ZrO₂/WO₃, for acid catalysis was prepared by precipitation and impregnation methods. The characterization of the prepared catalysts was performed by using X-ray diffraction (XRD). X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), and surface area measurements. For the NiO/CeO₂-ZrO₂/WO₃ samples, no diffraction lines of nickel oxide were observed up to 40 wt%, indicating good dispersion of nickel oxide on the catalyst surface. The hexagonal and monoclinic phases of WO₃ were observed when using calcination temperatures up to 500℃. whereas the hexagonal phase of WO₃ was transformed completely into a monoclinic phase of WO₃ at 600℃ and above. The role of CeO, in the catalyst was to form a thermally stable solid solution with zirconia and, consequently, to give high surface area and acidity. The catalytic activities for 2-propanol dehydration and cumene dealkylation correlated with the acidity of the catalysts measured by the ammonia chemisorption method. 20~25- NiO/5-CeO₂-ZrO₂/15-WO₃, containing 20~25 wt% NiO, 15 wt% WO₃, and 5 ㏖% CeO₂and calcined at 400℃, exhibited the maximum catalytic activity because of the effects of WO₃ modifying and CeO₂doping.