正丁烷在VMgO和Ni-VMgO催化剂上氧化脱氢  

Oxidative Dehydrogenation of n-Butane over VMgO and Ni-VMgO Catalysts

作　　者：刘睿[1] 王新平[1] 贾翠英[1] 施维[1] 

机构地区：[1]大连理工大学精细化工国家重点实验室,辽宁大连116024

出　　处：《催化学报》2005年第8期650-654,共5页

摘　　要：采用4种方法制备了VMgO催化剂样品(w(V2O5)=30%,w(MgO)=70%),并将其用于正丁烷氧化脱氢气固相反应.结果表明,MgO经蒸馏水回流和焙烧处理后再用NH4VO3溶液浸渍所制得的VMgO,对正丁烷氧化脱氢生成丁烯和丁二烯反应具有更好的催化性能.这是由于用该法制备的VMgO催化剂中存在较多的Mg3V2O8物种.通过添加Ni对VMgO催化剂进行了改性.结果表明,适量添加Ni(n(Ni)/n(V)=0.3)有利于催化剂中Mg3V2O8的生成,而Ni以Ni3V2O8的形态存在.由此明显改善了VMgO催化剂对正丁烷氧化脱氢生成丁烯和丁二烯反应的催化性能.The VMgO catalyst samples （ω（V2O5）= 30%, ω（MgO）= 70% ） were prepared by four different methods, characterized by XRD and FT-IR and used in oxidative dehydrogenation of n-butane. The VMgO catalyst sample prepared by impregnation using MgO as a support, which was treated in refluxing distilled water followed by calcination at 500 ℃ , showed higher activity and selectivity in the reaction. This was attributed to more Mg-orthovanadate （Mg3V2O8 ） and less Mg2V2O7 and V2O5 species in the sample. The VMgO catalyst was further modified with nickel component. By doping the VMgO catalyst with nickel at n （Ni）/n （V）= 0.3, the selectivity for butene and butadiene in the reaction was increased from 46.7 % at n-butane conversion of 18.3 % to 51.2% at n-butane conversion of 20.3%. The Ni-VMgO catalyst contained more Mg3V2O8 and less Mg2V2O7 species than the VMgO catalyst.

关 键 词：正丁烷 氧化脱氢 丁烯 丁二烯 氧化钒 氧化镁 复合氧化物 氧化镍 

分 类 号：O643.32[理学—物理化学]