Abstract: Diammonium hydrogen phosphate and ammonium metatungstate were used to prepare WP precursor. The impregnation and mixing methods were used to prepare the WP/γ-Al₂O₃ precursor with loading of 30%(counting by WO₃) , respectively. WP/γ-Al₂O₃ precursors by adding some content of promoter Ni,Co,V with loading of 30%(counting by WO₃) were also prepared with impregnation method, respectively. All catalysts were measured with thermogravimetric（TG）analysis in H₂ flow. The synthetic process of WP catalyst was studied. The effect of synthetic method and promoter on phosphiding extent of WP/γ-Al₂O₃ precursor was investigated. The results show that WP precursor can be reduced to WP completely in H₂ flow. W species on the surface of WP/γ-Al₂O₃ precursors prepared by impregnation or mixing methods can not be reduced to WP completely in H₂ flow . A substance with a similar structure of -Al-O-W-P is probably formed on the support surface. Compared with WP/γ-Al₂O₃ precursor by mixing method, W species is more difficult to be reduced to WP on the surface of WP/γ-Al₂O₃ precursor by impregnation method. It suggests that inginating reduced temperature of WP/γ-Al₂O₃ precursor is obviously decreased by adding promoter nickel(Ni). Cobalt(Co) increases the phosphiding extent of WP/γ-Al₂O₃ precursor. Adding vanadium(V) species on the surface of WP/γ-Al₂O₃ precursor is more different to be reduced to WP.

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摘要： 以磷酸氢二铵和偏钨酸铵为原料,制备了WP前体。分别采用共浸渍法和机械混合法制备了负载量
为30%的WP/γ-Al₂O₃ 催化剂前体(I-Cat,H-Cat)。采用共浸渍法,分别制备了不同助剂Ni,Co,V的负载量为
30%的WP/γ-Al₂O₃ 催化剂前体(I-Ni-Cat,I-Co-Cat,I-V-Cat),对制备的催化剂前体在一定的氢气氛下进
行了热重(TG)分析,探索了WP催化剂的制备机理和制备方法,以及助剂对负载型磷化钨催化剂前体磷化还原程度
的影响。结果表明,WP催化剂前体在一定的氢气氛中可以被完全还原磷化为WP;I-Cat和H-Cat表面的钨物种
均不能被完全还原磷化为WP,在载体表面可能形成了-Al-O-W-P结构的物种。与H-Cat相比,I-Cat表面
的W 物种更难被还原磷化为WP。助剂Ni使I-Ni-Cat的起始还原磷化温度明显降低;助剂Co使I-Co-Cat还
原磷化程度提高;而助剂V使I-V-Cat的还原磷化变得更为困难。

关键词: 磷化钨   ,   , 制备过程  ,   ,  热重分析  ,   ,  载体  ,   ,  助剂