掺杂铋助剂对钒磷氧催化剂性能的影响

通过在有机相法制备钒磷氧催化剂前体的过程中引入铋助剂,考察了不同n(Bi)/n(V)催化剂的催化性能。结果表明,当n(Bi)/n(V)=0.01时,催化剂(Bi0.01-VPO)的收率达到最大(42.6%),与没有掺杂铋助剂的催化剂(VPO)相比其转化率由31%提高到71%。采用BET、XRD、SEM、XPS分析手段,对催化剂(Bi0.01-VPO)与(VPO)进行比较分析,发现添加铋助剂改变了催化剂物相组成和微观形貌,使催化剂表面钒的平均氧化态和表面n(P)/n(V)比都有所升高,略微增大了催化剂的比表面积。

Effect of doping Bi promoter on performance of vanadium-phosphorous oxide catalysts

Vanadium phosphorous oxide catalyst precursors were prepared in organic medium and with added Bi promoter.The catalytic performance of catalysts with different n(Bi)/n(V) were investigated.Experimental results showed that,when n(Bi)/n(V) was 0.01,the yield of this catalyst(Bi0.01-VPO) reached the highest 42.6%,its conversion was enhanced from 31% to 71% compared to non Bi-doped catalyst.By using BET,XRD,SEM and XPS techniques,comparative analysis was carried out between(Bi0.01-VPO) and(VPO).Specific surface area of catalyst(Bi0.01-VPO)was slightly increased,and the composition and microscopic appearance of catalyst phases changed by introducing the Bi promoter.Moreover,the oxidation state of catalyst surface vanadium species state and surface n(P)/n(V) were also higher.