摘要:
The present invention relates to a process for the production of unsaturated aliphatic acids and the catalyst therefor, by the vapor phase oxidation of the corresponding unsaturated aliphatic aldehydes with molecular oxygen, optionally in the presence of steam, in the presence of an oxidation catalyst consisting of the oxides of the elements molybdenum, vanadium, tungsten and lanthanum, and optionally one or more of the oxides of the elements manganese, iron, copper, aluminum, cobalt, nickel, phosphorus, zinc, bismuth, silver, cadmium, niobium, arsenic, chromium, the alkali and the alkaline earth elements.
摘要:
The present invention relates to a process for the production of unsaturated aliphatic acids and the catalyst therefor, by the vapor phase oxidation of the corresponding unsaturated aliphatic aldehydes with molecular oxygen, optionally in the presence of steam, in the presence of an oxidation catalyst consisting of the oxides of the elements molybdenum, vanadium, tungsten and lanthanum, and optionally one or more of the oxides of the elements manganese, iron, copper, aluminum, cobalt, nickel, phosphorus, zinc, bismuth, silver, cadmium, niobium, arsenic, chromium, the alkali and the alkaline earth elements.
摘要:
The present invention is a catalyst composition consisting of oxides or oxide complexes that contains catalytically significant amounts of uranium or thorium plus, tungsten, vanadium and molybdenum plus optionally one or more of Co, Ni, Zn, Cu, Mg, Mn, Bi, Ti, Zr, Sn, P, an alkali metal, an alkaline earth metal, lanthanum or an element of the lanthanoid series. These catalysts are especially useful for producing acrylic acid from acrolein and for producing methacrylic acid from methacrolein.
摘要:
Catalysts consisting of a base support having a strongly adherent outer coating of an active catalytic material have been found to give superior results in known hydrogen processing reactions wherein sulfur, nitrogen and the metal content of a hydrogen feedstock are reduced.
摘要:
Exceptionally reproducible catalysts comprising vanadium and phosphorus are obtained when the catalysts are prepared in an aqueous oxide slurry comprising vanadium, phosphorus and a mineral acid-free, inorganic reducing agent, which is capable of reducing the vanadium in the catalyst to a valence state below +5. Additional promoters may be selected from the group of elements of Group IB through VIB, VIII, lanthanides, actinides, and IA through VIA, excluding the elements H, N, O, C, Fr, Ra, and Po. Catalysts of particular interest consist of the elements vanadium, phosphorus, uranium and oxygen, or vanadium, phosphorus, oxygen and uranium in combination with at least one element selected from the group consisting of Ta, Ce, Cr, Mn, Co, Cu, Sb, Fe, Bi, W, Mo, Hf, Zr, Th, S, an alkali metal and an alkaline earth metal.
摘要:
Catalysts which are excellent for exothermic reactions have been discovered. These catalysts consist of an essentially inert support having a strongly adherent outer coating of active catalytic material.
摘要:
Coated catalysts having an inert support material with an outer surface and a coating of active catalyst containing tungsten, vanadium and molybdenum plus optionally one or more of Fe, Mn, Cu, Sn, Sb, Cr, Ce, U, Co, Ni, Zn, Mg or mixture thereof have been found to be especially effective catalysts for the production of unsaturated acids from the corresponding unsaturated aldehydes, for example, acrolein is oxidized to acrylic acid using these catalysts. The catalysts give a very low exotherm, very high single pass yields of the desired acid and reduce the undesirable by-products.
摘要:
Exceptionally reproducible catalysts comprising vanadium and phosphorus are obtained when the catalysts are prepared in an aqueous oxide slurry comprising vanadium, phosphorus and a mineral acid-free, inorganic reducing agent, which is capable of reducing the vanadium in the catalyst to a valence state below +5. Additional promoters may be selected from the group of elements of Group IB through VIB, VIII, lanthanides, actinides, and IA through VIA, excluding the elements H, N, O, C, Fr, Ra, and Po. Catalysts of particular interest consist of the elements vanadium, phosphorus, oxygen, and optionally at least one of Ta, Ce, Cr, Mn, Co, S, Cu, Sb, Fe, Bi, W, Mo, Hf, Zr, Th, an alkali metal and an alkaline earth metal.
摘要:
The present invention is a catalyst composition consisting of oxides or oxide complexes that contains catalytically significant amounts of cerium, tungsten, vanadium and molybdenum plus optionally one or more of Fe, Co, Ni, Zn, Cu, Mg, Mn, Bi, Ti, Zr, Sn, P, an alkali metal, an alkaline earth metal, lanthanum or an element of the lanthanoid series. These catalysts are especially useful for producing acrylic acid from acrolein and for producing methacrylic acid from methacrolein.
摘要:
The present invention is a catalyst composition consisting of oxides or oxide complexes that contains catalytically significant amounts of cerium, tungsten, vanadium and molybdenum plus optionally one or more of Co, Ni, Zn, Cu, Mg, Mn, Bi, Ti, Zr, Sn, P, an alkali metal, an alkaline earth metal, lanthanum or an element of the lanthanoid series. These catalysts are especially useful for producing acrylic acid from acrolein and for producing methacrylic acid from methacrolein.