摘要:
This invention concerns catalysts comprising a molybdenum compound of formula (I): VqMoAyOz, (II): NiMoxByOz′, (III): VNiwMoxCy′Oz″, (IV): CoNiwMoxDyOz′″, or (V): VNiwCOrMoxEyOz″″, wherein: A is at least one cation selected from the group consisting of cations of Cr, Sb, Co, Ce and Pb; B is at least one cation selected from the group consisting of cations of Sb, Al and W; C is at least one cation selected from the group consisting of cations of Fe, Zn, Al, Sb, Bi, W, Li, Ba, Nb and Sn; D is at least one cation selected from the group consisting of cations of Ba, Mn, Al, Sb, Sn and W; E is at least one cation selected from the group consisting of cations of Fe, Ca, Mn, Sr, Eu, La, Zr, Ga, Sn and Pb; q, r, w, x, y, y′, z, z′, z″, z′″ and z″″ are as defined in the disclosure. These catalysts can be used in C4 oxidation processes.
摘要:
Mixed metal oxide catalysts (ZnO, CeO, La2O3, NiO, Al203, Si02, TiO2, Nd2O3, Yb2O3, or any combination of these) supported on zirconia (ZrO2) or hydrous zirconia are provided. These mixed metal oxide catalysts can be prepared via coprecipitation, impregnation, or sol-gel methods from metal salt precursors with/without a Zirconium salt precursor. Metal oxides/ZrO2 catalyzes both esterification and transesterification of oil containing free fatty acids in one batch or in single stage. In particular, these mixed metal oxides supported or added on zirconium oxide exhibit good activity and selectivity for esterification and transesterification. The low acid strength of this catalyst can avoid undesirable side reaction such as alcohol dehydration or cracking of fatty acids. Metal oxides/ZrO2 catalysts are not sensitive to any water generated from esterification. Thus, esterification does not require a water free condition or the presence of excess methanol to occur when using the mixed metal oxide catalyst. The FAME yield obtained with metal oxides/ZrO2 is higher than that obtained with homogeneous sulfuric acid catalyst. Metal oxides/ZrO2 catalasts can be prepared as strong pellets and in various shapes for use directly in a flow reactor. Furthermore, the pellet has a strong resistance toward dissolution to aqueous or oil phases.
摘要:
A catalyst composition comprising molybdenum, vanadium, antimony niobium, at least one element select from the group consisting of titanium, tin, germanium, zirconium, and hafnium, and at least one lanthanide selected from the group consisting of lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium; with the proviso that catalyst contains germanium (in the absence of at last one of titanium, tin, zirconium, hafnium) only in combination with neodymium and/or praseodymium and no other lanthanides. Such catalyst compositions are effective for the gas-phase conversion of propane to acrylonitrile and isobutane to methacrylonitrile (via ammoxidation).
摘要:
This invention concerns catalysts comprising a molybdenum compound of formula I, II, III, IV or VVqMoAyOznullnullINiMoxByOznullnullnullIIVNiwMoxCynullOznullnullnullIIICoNiwMoxDyOznullnullnullnullIVVNiwCorMoxEyOznullnullnullnullVwherein: A is at least one cation selected from the group consisting of cations of: Cr, Sb, Co, Ce and Pb; B is at least one cation selected from the group consisting of cations of: Sb, Al and W; C is at least one cation selected from the group consisting of cations of: Fe, Zn, Al, Sb, Bi, W, Li, Ba, Nb and Sn; D is at least one cation selected from the group consisting of cations of: Ba, Mn, Al, Sb, Sn, and W; E is at least one cation selected from the group consisting of cations of: Fe, Ca, Mn, Sr, Eu, La, Zr, Ga, Sn and Pb; q, r, w, x and y are each independently a number from 0.1 to 10 and ynull is a number from 0 to 10, z, znull, znull, znullnull, and znullnull are determined using the amounts and oxidation states of all cations present in each formula. These catalysts can be used in C4 oxidation processes, especially butane oxidation processes.
摘要:
A composition comprising 2,3-butanediol is dehydrated to methyl vinyl carbinol and/or 1,3-butadiene by exposure to a catalyst comprising (a) MxOy wherein M is a rare earth metal, a group IIIA metal, Zr, or a combination thereof, and x and y are based upon an oxidation state of M, or (b) M3a(PO4)b where M3 is a group IA, a group IIA metal, a group IIIA metal, or a combination thereof, and a and b are based upon the oxidation state of M3. Embodiments of the catalyst comprising MxOy may further include M2, wherein M2 is a rare earth metal, a group IIA metal, Zr, Al, or a combination thereof. In some embodiments, 2,3-butanediol is dehydrated to methyl vinyl carbinol and/or 1,3-butadiene by a catalyst comprising MxOy, and the methyl vinyl carbinol is subsequently dehydrated to 1,3-butadiene by exposure to a solid acid catalyst.
摘要翻译:将包含2,3-丁二醇的组合物通过暴露于包含(a)M x Oy的催化剂脱水成甲基乙烯基甲醇和/或1,3-丁二烯,其中M是稀土金属,IIIA族金属,Zr或组合 并且x和y基于M的氧化态,或(b)M3a(PO4)b,其中M3是IA族,IIA族金属,IIIA族金属或其组合,a和b 是基于M3的氧化态。 包含M x O y的催化剂的实施方案可以进一步包括M2,其中M2是稀土金属,IIA族金属,Zr,Al或它们的组合。 在一些实施方案中,通过包含M x O y的催化剂将2,3-丁二醇脱水成甲基乙烯基甲醇和/或1,3-丁二烯,然后通过暴露于固体酸催化剂将甲基乙烯基甲醇脱水为1,3-丁二烯 。
摘要:
A composition comprising 2,3-butanediol is dehydrated to methyl vinyl carbinol and/or 1,3-butadiene by exposure to a catalyst comprising (a) MxOy wherein M is a rare earth metal, a group IIIA metal, Zr, or a combination thereof, and x and y are based upon an oxidation state of M, or (b) M3a(PO4)b where M3 is a group IA, a group IIA metal, a group IIIA metal, or a combination thereof, and a and b are based upon the oxidation state of M3. Embodiments of the catalyst comprising MxOy may further include M2, wherein M2 is a rare earth metal, a group IIA metal, Zr, Al, or a combination thereof. In some embodiments, 2,3-butanediol is dehydrated to methyl vinyl carbinol and/or 1,3-butadiene by a catalyst comprising MxOy, and the methyl vinyl carbinol is subsequently dehydrated to 1,3-butadiene by exposure to a solid acid catalyst.
摘要翻译:将包含2,3-丁二醇的组合物通过暴露于包含(a)M x Oy的催化剂脱水成甲基乙烯基甲醇和/或1,3-丁二烯,其中M是稀土金属,IIIA族金属,Zr或组合 并且x和y基于M的氧化态,或(b)M3a(PO4)b,其中M3是IA族,IIA族金属,IIIA族金属或其组合,a和b 是基于M3的氧化态。 包含M x O y的催化剂的实施方案可以进一步包括M2,其中M2是稀土金属,IIA族金属,Zr,Al或它们的组合。 在一些实施方案中,通过包含M x O y的催化剂将2,3-丁二醇脱水成甲基乙烯基甲醇和/或1,3-丁二烯,然后通过暴露于固体酸催化剂将甲基乙烯基甲醇脱水为1,3-丁二烯 。
摘要:
This invention concerns catalysts comprising a molybdenum compound of formula I, II, III, IV or V I VqMoAyOz II NiMoxByOznullIII VNiwMoxCynullOznullIV CoNiwMoxDyOznullnullV VNiwCorMoxEyOznullnullwherein: A is at least one cation selected from the group consisting of cations of: Cr, Sb, Co, Ce and Pb; B is at least one cation selected from the group consisting of cations of: Sb, Al and W; C is at least one cation selected from the group consisting of cations of: Fe, Zn, Al, Sb, Bi, W, Li, Ba, Nb and Sn; D is at least one cation selected from the group consisting of cations of: Ba, Mn, Al, Sb, Sn, and W; E is at least one cation selected from the group consisting of cations of: Fe, Ca, Mn, Sr, Eu, La, Zr, Ga, Sn and Pb; q, r, w, x and y are each independently a number from 0.1 to 10 and ynull is a number from 0 to 10, z, znull, znull, znullnull, and znullnull are determined using the amounts and oxidation states of all cations present in each formula. These catalysts can be used in C4 oxidation processes, especially butane oxidation processes.
摘要:
Provided are a cerium-zirconium composite oxide, a preparation method therefor and application of a catalyst. The cerium-zirconium composite oxide has a composite phase structure, and comprises a cerium oxide phase and a cerium-zirconium solid solution phase, or consists of two or more cerium-zirconium solid solution phases with different crystal structures and different chemical compositions, wherein the chemical formula of the cerium-zirconium solid solution phase is CexZr1-x-yMyO2, where M is at least one selected from the group consisting of a rare earth element other than cerium, a transition metal element and an alkaline earth metal element, x is 15-85 mol %, and y is 0-20 mol %.
摘要:
Mixed metal oxide catalysts (ZnO, CeO, La2O3, NiO, Al203, Si02, TiO2, Nd2O3, Yb2O3, or any combination of these) supported on zirconia (ZrO2) or hydrous zirconia are provided. These mixed metal oxide catalysts can be prepared via coprecipitation, impregnation, or sol-gel methods from metal salt precursors with/without a Zirconium salt precursor. Metal oxides/ZrO2 catalyzes both esterification and transesterification of oil containing free fatty acids in one batch or in single stage. In particular, these mixed metal oxides supported or added on zirconium oxide exhibit good activity and selectivity for esterification and transesterification. The low acid strength of this catalyst can avoid undesirable side reaction such as alcohol dehydration or cracking of fatty acids. Metal oxides/ZrO2 catalysts are not sensitive to any water generated from esterification. Thus, esterification does not require a water free condition or the presence of excess methanol to occur when using the mixed metal oxide catalyst. The FAME yield obtained with metal oxides/ZrO2 is higher than that obtained with homogeneous sulfuric acid catalyst. Metal oxides/ZrO2 catalasts can be prepared as strong pellets and in various shapes for use directly in a flow reactor. Furthermore, the pellet has a strong resistance toward dissolution to aqueous or oil phases.
摘要:
This invention concerns catalysts comprising a molybdenum compound of formula I, II, III, IV or V VqMoAyOz I NiMoxByOz′ II VNiwMoxCy′Oz″ III CoNiwMoxDyOz′″ IV VNiwCorMoxEyOz″″ V wherein: A is at least one cation selected from the group consisting of cations of: Cr, Sb, Co, Ce and Pb; B is at least one cation selected from the group consisting of cations of: Sb, Al and W; C is at least one cation selected from the group consisting of cations of: Fe, Zn, Al, Sb, Bi, W, Li, Ba, Nb and Sn; D is at least one cation selected from the group consisting of cations of: Ba, Mn, Al, Sb, Sn, and W; E is at least one cation selected from the group consisting of cations of: Fe, Ca, Mn, Sr, Eu, La, Zr, Ga, Sn and Pb; q, r, w, x and y are each independently a number from 0.1 to 10 and y′ is a number from 0 to 10, z, z′, z″, z′″, and z″″ are determined using the amounts and oxidation states of all cations present in each formula. These catalysts can be used in C4 oxidation processes, especially butane oxidation processes.