稀土对Keggin结构磷钼酸催化剂结构和性能的影响

Effect of Adding Rare Earth on Properties of Heteropolyacid with Keggin Structure

合成了具有Keggin结构的杂多酸催化剂。选用稀土元素La、Ce、Pr对催化剂进行掺杂,考察了添加稀土前后的结构、热性能以及对异丁酸的吸附情况,讨论了稀土的添加对催化剂结构和性能的影响。

In this study,the catalyst of hetero polyacid with Keggin structure was s uccessfully synthesized￡(r)The influ ences of the rare-earth element La,Ce,and Pr used as additive in the catalysts h as been studied by means of XRD￡?IR and TG￡-DTA technology￡(r)The results s howed that the addition of rare earth to Mo-P-O heterolpolyacid catalyst could improve its thermal stability and stabilizing the structure of H￡3PMo ￡±￡2O￡′￡° ￡(r)However,iso-butyric acid can be ad sorbed on surface of Mo-P-O heterolpolyacid and it led to a strong adsorption aft er adding La￡?Ce and Pr￡(r)