Abstract:
A process for preparing a mesoporous alumina is described, comprising the following steps: a) mixing, in aqueous solution, at least one source of aluminium constituted by an aluminium alkoxide, at least one cationic surfactant and at least one organic solvent selected from methanol and ethanol; b) hydrothermally treating the mixture formed in said step a); c) drying the solid formed in said step b); d) calcining the solid formed in said step c).
Abstract:
A catalyst contains at least one group VIII element and at least molybdenum and/or tungsten, said elements being present at least in part in the catalyst in the dry state in the form of at least one heteropolyanion with formula MxAB6O24H6C(3-2x), tH2O; MxAB6O24H6C(4-2x), tH2O; MxA2B10O38H4C(6-2x), tH2O; MxA2B10O38H4C(8-2x), tH2O; or MxA2B10O38H4C(7-2x), tH2O, in which M is cobalt and/or nickel and/or iron and/or copper and/or zinc, A is one or two elements from group VIII of the periodic table, B is molybdenum and/or tungsten and C is an H+ ion and/or a (NR1R2R3R4)+ type ammonium ion, in which R1, R2, R3 and R4, which may be identical or different, correspond either to a hydrogen atom or to an alkyl group and/or caesium and/or potassium and/or sodium, t is a number between 0 and 15 and x takes a value in the range 0 to 4 depending on the formula.
Abstract translation:催化剂含有至少一种VIII族元素和至少钼和/或钨,所述元素至少部分地以至少一种具有式M x x的杂多阴离子的形式存在于干燥状态的催化剂中, (3-2x),tH 2,...,...,...,...,...,...,... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...“ SUB> O; (4-2x),其中,C 1,C 2,C 4, t H 2 O; (A)(A)(A)(B) 6-2x),tH 2 O; (A)(A)(A)(B) 8-2x),tH 2 O; 或者M 1 A 2 B 2 O 3 C 3 H 4 C 3 H 3 (7-2x),其中M是钴和/或镍和/或铁和/或铜和/或锌,A是一个或两个元素, 元素周期表第Ⅷ族,B为钼和/或钨,C为H +离子和/或(NR 1 R 2 R 2) 其中R 1,R 2,R 2,R 3,R 3,R 3,R 3, R 3,R 3和R 4可以相同或不同,对应于氢原子或烷基和/或铯和/或钾 和/或钠,t为0至15之间的数字,x取值范围为0至4,具体取决于公式。
Abstract:
The invention provides a method for preparing catalysts, containing metals of groups VI and VIII on a carrier. The metals of groups VI and VIII metals are introduced in the form of a compound of formula M.sub.x A B.sub.12 O.sub.40 in which M is cobalt and/or nickel, A is phosphorus, silicon and/or boron, B is molybdenum and/or tungsten and x is 2 or more, 2.5 or more, or 3 or more depending on whether A is respectively phosphorus, silicon or boron. The catalysts thus obtained are useful for hydro-treating hydrocarbon feedstocks.
Abstract:
A process for preparing a mesoporous alumina is described, comprising the following steps: a) mixing, in aqueous solution, at least one source of aluminum constituted by an aluminum alkoxide, at least one cationic surfactant and at least one organic solvent selected from methanol and ethanol; b) hydrothermally treating the mixture formed in said step a); c) drying the solid formed in said step b); d) calcining the solid formed in said step c).