Light olefins synthesis from C1-C2 paraffins via oxychlorination processes
- 414 Downloads
A two-step process was employed to convert methane or ethane to light olefins via the formation of an intermediate monoalkyl halide. A novel K4RuOCl10/TiO2 catalyst was tested for the oxidative chlorination of methane and ethane. The catalyst had high selectivity for methyl and ethyl chlorides, 80% and 90%, respectively. During the oxychlorination of ethane at T⩾250°C, the formation of ethylene as a reaction product along with ethyl chloride was observed. In situ Fourier transform infrared studies showed that the key intermediate for monoalkyl chloride and ethylene formation is the alkoxy group. The reaction mechanism for the oxidative chlorination of methane and ethane over the Ru-oxychloride catalyst was proposed. The novel fiber glass catalyst was also tested for the dehydrochlorination of alkyl chlorides to ethylene and propylene. Very high selectivities (up to 94%–98%) for ethylene and propylene formation as well as high stability were demonstrated.
Keywordsoxychlorination methane ethane light ole-fins ruthenium catalyst
Unable to display preview. Download preview PDF.
- 4.Wang C, Xu L, Wang Q. Review of directly producing light olefins via CO hydrogenation. Journal of Natural Gas Chemistry, 2003, 12(1): 10–16Google Scholar
- 8.Olah G A, Gupta B, Farina M, Felberg J D, Ip W M, Husain A, Karpeles R, Lammertsma K, Melhotra A K, Trivedi N J. Selective Monohalogenation of methane over supported acid or platinum metal catalysts and hydrolysis of methyl halides over γ-aluminasupported metal oxide/hydroxide catalysts. A feasible path for the oxidative conversion of methane into methyl alcohol/dimethyl ether. Journal of the American Chemical Society, 1985, 107(24): 7097–7105CrossRefGoogle Scholar
- 16.Zhang D, Wei Y, Xu L, Chang F, Liu Z, Meng S, Su B L, Liu Z. MgAPSO-34 molecular sieves with various Mg stoichiometries: Synthesis, characterization and catalytic behavior in the direct transformation of chloromethane into light olefins. Micro Meso Mater, 2008, 116(1–3): 684–692CrossRefGoogle Scholar
- 17.Liu Z, Huang L, Li W S, Yang F, Au C T, Zhou X P. Higher hydrocarbons from methane condensation mediated by HBr. Journal of Molecular Catalysis, 2007, 273(1–2): 14–20Google Scholar
- 26.Crihan D, Knapp M, Zweidinger S, Lundgren E, Weststrate C J, Andersen J N, Seitsonen A P, Over H. Stable deacon process for HCl oxidation over RuO2. Angewandte Chemie International Edition, 2008, 120(11): 2161–2164Google Scholar
- 28.Borello E, Zecchina A, Morterra C. Infrared study of methanol adsorption on Aerosil. I. Chemisorption at room temperature Journal of Physical Chemistry, 1967, 71(9): 2938–2945Google Scholar