异丁烷部分氧化V-P-O/SiO2催化剂的研究 |
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作者单位: | 天津大学化工学院,天津,300072;天津大学化工学院,天津,300072;天津大学化工学院,天津,300072 |
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基金项目: | 国家自然科学基金;国家重点基础研究发展计划(973计划) |
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摘 要: |
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关 键 词: | 异丁烷 部分氧化 负载型V-P-O催化剂 溶胶-凝胶技术 |
Study on the V-P-O/SiO2 Catalyst in the Partial Oxidation of Iso-butane |
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Authors: | Zhong Shunhe Wang Xitao Geng Yunfeng |
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Abstract: | The V2O5/SiO2 and V2O5-P2O5/SiO2 catalysts were prepared by the Sol-gel method. The surface composition,structure,chemisorption and reactivity of the catalysts were systematically studied by using the techniques of XRD,TPR,IR,TPD and icro-reactor. The results showed that the active component was dispersed uniformly on the surface of amorphous SiO2 . There existed Lewis base sites(V=O and V-O-V)and Lewis acid sites (Vn+)on the surface of these catalysts. An addition of PO43- could lower the activity of surface terminal oxygen of Lewis base sites V=O. Iso-butane could chemisorbed on surface terminal oxygen of Lewis base sites V=O by one or two H atoms in -CH3 to form molecular adsorption states. Reaction products of i-C4H10 on the V-P-O/SiO2 catalyst were mainly i-C4H8,MAL,MAA and COx . Conversion of i-C4H10 was 5% and selectivity of partial oxidation products is above 72% at 300℃. The addition of PO43- could improve the selectivity of partial oxidation products on the VSiO catalyst because PO43- could reduce the activity of lattice oxygen in V = O bond,and weaken the adsorption intensity of i-C4H10 . |
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Keywords: | Iso-butane,Partial oxidation,Supported V-P-O catalyst,Sol-gel |
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