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Study on the V-P-O/ SiO2 Catalyst in the Partial Oxidation of Iso-butane
Zhong Shunhe*,Wang Xitao,Geng Yunfeng
Author NameAffiliationE-mail
Zhong Shunhe* College of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072 shzhong@public.tpt.tj.cn 
Wang Xitao College of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072  
Geng Yunfeng College of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072  
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 .
Key words:  Iso-butane,Partial oxidation,Supported V-P-O catalyst,Sol-gel
FundProject:
异丁烷部分氧化V-P-O/SiO2催化剂的研究
钟顺和*,王希涛,耿云峰
摘要:
采用溶胶-凝胶法制备了V2O5/SiO2和V2O5-P2O5/SiO2催化剂,用XRD、TPR、IR、TPD和微反应等技术研究了催化剂的表面结构、晶格氧活泼性、化学吸附和异丁烷部分氧化反应性能. 结果表明,催化剂的活性组份在无定型的SiO2表面上呈超细粒子均匀分布,表面活性位主要由Lewis碱位(V=O键的端氧、V-O-V键的桥氧)和Lewis酸位(Vn+)构成,PO43-的引入可以降低表面Lewis碱位V=O 键端氧的活泼性;异丁烷分子主要通过两个甲基中H双位吸附在催化剂表面Lewis碱位V=O的端氧上
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
DOI:10.1088/1674-0068/17/1/91-94
分类号: