催化学报
催化學報
최화학보
CHINESE JOURNAL OF CATALYSIS
2001年
1期
26-30
,共5页
醇%二水磷酸氧钒%还原%半水磷酸氢氧钒%择优取向%正丁烷%氧化
醇%二水燐痠氧釩%還原%半水燐痠氫氧釩%擇優取嚮%正丁烷%氧化
순%이수린산양범%환원%반수린산경양범%택우취향%정정완%양화
研究了用醇还原VOPO4.2H2O制备的VOHPO4.0.5H2O的晶面择优取向现象及其在正 丁烷和空气混合气体中活化后,产物(VO)2P2O7的晶面择优暴露对正丁烷氧化制顺酐性 能的影响. 以伯醇还原VOPO4.2H2O制备的VOHPO4.0.5H2O晶体,晶面择优取向于( 220)面,晶型为玫瑰状或扭曲的片状聚集体; 活化后的产物仅含(VO)2P2O7相,其(020) 晶面择优暴露. 以仲醇还原VOPO4.2H2O制备的VOHPO4.0.5H2O晶体,晶面择优取 向于(001)面,晶型为平板片状体; 活化后的产物由(VO)2P2O7, VOPO4和无定形相组 成,其中(VO)2P2O7相含量低,其(020)晶面暴露少. 由苄醇、环己醇和3-甲基-3庚醇 还原VOPO4.2H2O制备的VOHPO4.0.5H2O的XRD谱与用仲醇制备的相似. 用一般方 法(V2O5/异丁醇/H3PO4)制备的VOHPO4.0.5H2O晶体不具有晶面择优取向性质 ,活化后得到的(VO)2P2O7的结晶度较低. 由正辛醇还原VOPO4.2H2O制备的VOHPO 4.0.5H2O经活化后,对正丁烷氧化制顺酐的催化性能优于用仲辛醇和一般方法制备的V OHPO4.0.5H2O.
研究瞭用醇還原VOPO4.2H2O製備的VOHPO4.0.5H2O的晶麵擇優取嚮現象及其在正 丁烷和空氣混閤氣體中活化後,產物(VO)2P2O7的晶麵擇優暴露對正丁烷氧化製順酐性 能的影響. 以伯醇還原VOPO4.2H2O製備的VOHPO4.0.5H2O晶體,晶麵擇優取嚮于( 220)麵,晶型為玫瑰狀或扭麯的片狀聚集體; 活化後的產物僅含(VO)2P2O7相,其(020) 晶麵擇優暴露. 以仲醇還原VOPO4.2H2O製備的VOHPO4.0.5H2O晶體,晶麵擇優取 嚮于(001)麵,晶型為平闆片狀體; 活化後的產物由(VO)2P2O7, VOPO4和無定形相組 成,其中(VO)2P2O7相含量低,其(020)晶麵暴露少. 由芐醇、環己醇和3-甲基-3庚醇 還原VOPO4.2H2O製備的VOHPO4.0.5H2O的XRD譜與用仲醇製備的相似. 用一般方 法(V2O5/異丁醇/H3PO4)製備的VOHPO4.0.5H2O晶體不具有晶麵擇優取嚮性質 ,活化後得到的(VO)2P2O7的結晶度較低. 由正辛醇還原VOPO4.2H2O製備的VOHPO 4.0.5H2O經活化後,對正丁烷氧化製順酐的催化性能優于用仲辛醇和一般方法製備的V OHPO4.0.5H2O.
연구료용순환원VOPO4.2H2O제비적VOHPO4.0.5H2O적정면택우취향현상급기재정 정완화공기혼합기체중활화후,산물(VO)2P2O7적정면택우폭로대정정완양화제순항성 능적영향. 이백순환원VOPO4.2H2O제비적VOHPO4.0.5H2O정체,정면택우취향우( 220)면,정형위매괴상혹뉴곡적편상취집체; 활화후적산물부함(VO)2P2O7상,기(020) 정면택우폭로. 이중순환원VOPO4.2H2O제비적VOHPO4.0.5H2O정체,정면택우취 향우(001)면,정형위평판편상체; 활화후적산물유(VO)2P2O7, VOPO4화무정형상조 성,기중(VO)2P2O7상함량저,기(020)정면폭로소. 유변순、배기순화3-갑기-3경순 환원VOPO4.2H2O제비적VOHPO4.0.5H2O적XRD보여용중순제비적상사. 용일반방 법(V2O5/이정순/H3PO4)제비적VOHPO4.0.5H2O정체불구유정면택우취향성질 ,활화후득도적(VO)2P2O7적결정도교저. 유정신순환원VOPO4.2H2O제비적VOHPO 4.0.5H2O경활화후,대정정완양화제순항적최화성능우우용중신순화일반방법제비적V OHPO4.0.5H2O.
VOHPO4.0.5H2O was prepared by reducing VOPO4.2H2O with various alcoho ls and then calcinated in n-butane/air to produce the final catalysts. The preferential orientation of VOHPO4.0.5H2O and the influence of the prefere ntial exposition of the plane of the final catalysts on catalytic oxidation of n-butane to maleic anhydride (MA) were investigated. VOHPO4.0.5H2O wi th rose-like or twist agglomerated type structure prepared by reducing VOPO4 .2H2O with primary alcohol orientates preferentially the (220) plane, the fin al catalyst contains only (VO)2P2O7 phase, the (020) plane is preferential exposition. VOHPO4.0.5H2O with platelet type structure prepared by reduci ng VOPO4.2H2O with secondary alcohol orientates preferentially the (001) pl ane, the final catalyst is composed of (VO)2P2O7, VOPO4 and amorphous ph ase, and the exposition of the (020) plane of (VO)2P2O7 is less. The XRD p atterns of VOHPO4.0.5H2O prepared from cyclohexanol, benzyl alcohol and 3 -methyl-3-enanthol are similar to that prepared from secondary alcohol. VOHPO 4.0.5H2O derived from V2O5/isobutanol/H3PO4 (ordinary method) has no the preferential orientation of the plane. The results show that the catalyti c properties of the final catalyst prepared from 1-octyl alcohol for the oxidat ion of n-butane to MA are superior to that of the catalyst derived from 2- octyl alcohol and ordinary method.
