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- W2361149396 abstract "The supported dinuclear bridged Ni 2(OEt) 2/SiO 2 catalyst for direct synthesis of methacrylic acid from CO 2 and C 3H 6 was prepared by surface modification and ion-exchange method. The surface structure, thermal stability, chemisorption and catalytic performance of the catalyst were investigated by titration method, infrared spectroscopy, differential scanning calorimetry and micro-reactor evaluation techniques. The Ni 2+ bonded with surface O 2- of SiO 2 support in bidentate fashion and the bis-μ-OC 2H 5 bridged structure Ni 2(OEt) 2 formed between the two metal ions. The bridged bis-μ-OC 2H 5 was decomposed at 534 K and 566 K. CO 2 can be chemisorbed on the catalyst in two kinds of states, bridged adsorption state and monoethyl carbonate species. The bridged adsorption state can be transformed into monoethyl carbonate species at higher temperature. C 3H 6 can be chemisorbed on the catalyst only in one kind of state, molecular adsorption state. The influence of reaction temperature, reaction pressure and gas space velocity on the synthesis of methacrylic acid from CO 2 and C 3H 6 was investigated. The Ni 2(OEt) 2/SiO 2 catalyst has higher C 3H 6 conversion and 100% of selectivity for methacrylic acid under appropriate reaction conditions: n(CO 2)/ n(C 3H 6)=2, SV= 1*!500 h -1, p=0.5 MPa, T=443 K. The reaction mechanism for synthesis of methacrylic acid from CO 2 and C 3H 6 on the Ni 2(OEt) 2/SiO 2 catalyst was proposed based on the experimental results. The reactivity is determined by CO 2 and C 3H 6 co-adsorded on the same active center of the catalyst as well as COOH and C 3H 6 in dissociated adsorption state." @default.
- W2361149396 created "2016-06-24" @default.
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- W2361149396 date "2003-01-01" @default.
- W2361149396 modified "2023-09-22" @default.
- W2361149396 title "Catalytic Behaviour of Ni_2(OEt)_2/SiO_2 Catalyst for Direct Synthesis of Methacrylic Acid from Carbon Dioxide and Propylene" @default.
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