CAJ | 학술논문

采用有机相法制备了不同 P 与 V 物质的量比的 Mo 掺杂 VOHPO4·0.5H2 O 前驱体，并通过体积分数为50％空气-40％氮气-10％水蒸汽混合气氛活化得到 Mo / VPO 催化剂，采用固定床反应器评价其催化正丁烷氧化制顺酐的性能。结果表明，Mo / VPO 催化剂催化活性随 P 与 V 物质的量比的增大而降低，但顺酐选择性与 P 与 V 物质的量比并不呈线性关系，P 与 V 物质的量比为0.9的 Mo / VPO 催化剂具有最佳的催化性能。XRD 分析表明，Mo / VPO 催化剂催化正丁烷氧化制顺酐的主要活性物相为（VO）2 P2 O7和钒磷云母相，形成的主要因素不是 P 与 V 物质的量比，而是由焙烧条件决定。低 P 与 V 物质的量比的 Mo / VPO 中存在的少量 V2 O5物相能够提升催化剂的活性和顺酐选择性，但含量过高会因深度氧化降低催化性能。催化剂中存在的钒磷云母相有利于缩短催化剂稳定时间并提升催化性能。
채용유궤상법제비료불동 P 여 V 물질적량비적 Mo 참잡 VOHPO4·0.5H2 O 전구체，병통과체적분수위50％공기-40％담기-10％수증기혼합기분활화득도 Mo / VPO 최화제，채용고정상반응기평개기최화정정완양화제순항적성능。결과표명，Mo / VPO 최화제최화활성수 P 여 V 물질적량비적증대이강저，단순항선택성여 P 여 V 물질적량비병불정선성관계，P 여 V 물질적량비위0.9적 Mo / VPO 최화제구유최가적최화성능。XRD 분석표명，Mo / VPO 최화제최화정정완양화제순항적주요활성물상위（VO）2 P2 O7화범린운모상，형성적주요인소불시 P 여 V 물질적량비，이시유배소조건결정。저 P 여 V 물질적량비적 Mo / VPO 중존재적소량 V2 O5물상능구제승최화제적활성화순항선택성，단함량과고회인심도양화강저최화성능。최화제중존재적범린운모상유리우축단최화제은정시간병제승최화성능。
A series of Mo doped VOHPO4·0.5H2O precursors with different P/ V molar ratios was prepared by organic method. Mo / VPO catalysts were obtained by calcining the precursors and then activating in the mixed gas atmosphere 50% air-40% N2-10% steam( volume fraction). The catalytic performance of the catalysts for the oxidation of n-butane to maleic anhydride was investigated in a fixed bed reactor. The results showed that the activity of Mo / VPO catalyst was weakened with the increase of P/ V molar ratios, and the selectivity to maleic anhydride had no linear relationship with P/ V molar ratios. Mo / VPO catalyst with P/ V molar ratio 0. 9 exhibited the best catalytic performance. The results of XRD characterization indicated that the main active phases of Mo / VPO catalyst for the oxidation of n-butane to maleic anhydride were(VO)2 P2 O7 and V/ P mica phases,the formation of which were depended on the calcina-tion conditions. A small amount of V2 O5 in Mo/ VPO catalyst with low P/ V molar ratio was benefitial to the enhancement of catalyst activity and the selectivity to maleic anhydride. Excess V2 O5 ,however,lowered the selectivity to maleic anhydride because of deep oxidation. V/ P mica phase existed in the catalyst had a great effect on shortening activation time and improving the selectivity to maleic anhydride according to the activation tests.