Abstract:
A catalyst for the oxidation of volatile organic compounds and carbon monoxide comprising manganese and alumina, such catalyst having been impregnated with a phosphorus compound. The presence of the phosphorus compound results in a significant oxidative conversion of both the volatile organic compounds and the carbon monoxide. The catalyst is especially useful for treating gaseous streams that emanate from industrial sources, such as wood pulp manufacturing plants. The manganese portion of the catalyst is preferably comprised of manganese compounds comprising a defect non-stoichiometric manganese oxide of the type β-Mn3O4+x, wherein x has the value of 0.1≦x≦0.25 in respect to about 80 to about 95% of all manganese atoms, and manganese aluminate in respect to the balance of the manganese atoms. The alumina portion of the catalyst is preferably comprised of high temperature forms of alumina of the type comprising α-Al2O3 and (α+δ+θ)-Al2O3.
Abstract translation:用于氧化包含锰和氧化铝的挥发性有机化合物和一氧化碳的催化剂,这种催化剂已经用磷化合物浸渍。 磷化合物的存在导致挥发性有机化合物和一氧化碳的显着氧化转化。 催化剂特别适用于处理从工业来源产生的气流,如木浆制造厂。 催化剂的锰部分优选包含锰化合物,其包含类型为β-Mn 3 O 4 + x N的缺陷非化学计量的氧化锰,其中x具有 相对于锰原子的平衡,相对于约80至约95%的所有锰原子,0.1 <= x <= 0.25的值和铝酸锰。 催化剂的氧化铝部分优选由包含α-Al 2 O 3 3和(α+δ+θ)3 Al 3+的类型的高温形式的氧化铝组成, SUB> 2 O> 3。
Abstract:
The present invention discloses aqueous methods for enhancing the acid sites of fluid catalytic cracking (FCC) catalysts. The methods comprise the steps of contacting an FCC catalyst, either spent or fresh, with an aqueous solution comprising water, an inorganic acid substantially free of chloride and aluminum. The acid is preferably sulfurous or sulfuric acid. The aluminum is provided by an aluminum source selected from the group consisting of the alumina trihydrates and aluminum oxide. Chloride contamination of the aluminum source should be minimal, preferably less than about 1000 ppm chloride, more preferably less than about 200 ppm chloride. The pH of the aqueous solution is adjusted to about 3-12 by the addition of a sufficient quantity of ammonium hydroxide. The FCC catalyst is added to this solution, preferably with stirring, in a weight ratio of about 1 part catalyst to about 1-10 parts water to prepare an aqueous slurry. Upon stabilization of the pH of the aqueous slurry, enhancement of the acid sites of the catalyst is achieved and the catalyst may be separated from the slurry and, if desired, washed. This simple, aqueous process reduces the level of many metal poisons on the FCC catalyst and produces a catalyst having an enhanced number of acid reaction sites.
Abstract:
The instant invention relates to a method of preparing highly dispersed supported Group VIII metal catalysts. The instant invention further relates to the redispersion of sintered or agglomerated supported Group VIII metal catalysts. The process comprises the formation of supported Group VIII metal-phosphorus intermediate compounds followed by the treatment of these supported Group VIII metal-phosphorus compounds in an inert atmosphere at a temperature in the range of about 400.degree. C. to about 750.degree. C., preferably, about 550.degree. C. to about 700.degree. C., most preferably from 630.degree.-700.degree. C. The composition resultant from the dispersion heating step will form the highly dispersed, supported Group VIII metal catalysts by decomposition when reacting with an oxygen containing atmosphere, e.g. air, or reacting with water.
Abstract:
This specification discloses, as a composition of matter, a phosphorus-containing zeolite and discloses a method for preparing it. The composition is a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12, a constraint index of about 1 to 12, and containing phosphorus incorporated with the crystal structure thereof in an amount of at least about 0.78 percent by weight. The specification also discloses the use of the composition as a catalyst for the conversion of aliphatic compounds.
Abstract:
The performance of phosphorus-vanadium-oxygen catalysts useful for the conversion of saturated aliphatic hydrocarbons to maleic anhydride is dependent on the controlled calcination of the catalyst precursor. Phosphorus-vanadium-oxygen catalysts are prepared by mixing phosphorus and vanadium compounds to form precursors containing tetravalent vanadium, and calcining the precursors in an oxidizing atmosphere until a controlled level of pentavalent vanadium has been achieved, and then calcining the precursors in an inert atmosphere to higher temperatures to provide catalysts with the desired oxidation levels that are promptly active, so that valuable manufacturing facilities are not required to "activate the catalyst."
Abstract:
Process for the alkylation of aromatic hydrocarbons by contacting same with an olefin alkylating agent in a reaction zone maintained under conditions such that said alkylation is accomplished in the vapor phase and in the presence of a catalyst comprising a crystalline aluminosilicate zeolite, said zeolite having a silica to alumina ratio of at least about 12 and a constraint index, as hereinafter defined, of from 1 to 12, said catalyst having been modified by the addition thereto of phosphorus in an amount of at least about 0.5 percent by weight.
Abstract:
An improved process was found for preparing a vanadiumcontaining catalyst wherein a tetravalent vanadium compound is provided from a pentavalent vanadium compound, comprising contacting the pentavalent vanadium compound with a trivalent phosphorus compound. The improved process is exemplified by the preparation of phosphorus-vanadium-oxygen catalysts, and particularly the preparation of phosphorus-vanadium-oxygen catalysts having a phosphorus to vanadium atom ratio of about 1:2 to about 2:1 comprising contacting a vanadium compound with a trivalent phosphorus compound, recovering a phosphorus-vanadiumoxygen precursor, and thereafter, calcining the precursor to form the catalysts. Phosphorous acid is preferred as the trivalent phosphorus compound.
Abstract:
A catalyst support comprised of alumina and aluminum phosphate is prepared by the hydrolysis of an aluminum alkoxide such as aluminum sec-butoxide with an aqueous solution of phosphoric acid. The alumina-aluminum phosphate prepared in accordance with the invention is a stable material which can be readily formed for use as a support for catalysts useful in a number of hydrocarbon conversion processes. For example, the aluminaaluminum phosphate support may be impregnated with various combinations of cobalt, nickel, tungsten and molybdenum for use as a catalyst for the desulfurization and denitrogenation of both light and heavy petroleum fractions. The support material may also be combined with zeolitic materials for use in hydrocracking or catalytic cracking or combined with noble metals for use in the reforming of petroleum feedstocks.
Abstract:
Surface stabilized active alumina having significantly increased thermal stability is made by incorporating 1-20%, preferably 218% by weight PO4-ion (calculated on the weight of the calcined composite) in alumina having an essentially pseudoboehmitic structure. The stabilized active alumina retains its surface area and consequently its activity for prolonged periods under high temperature exposure, for example at 900* C without material deterioration.
Abstract:
Processes and a catalyst for the cycloaddition of an olefin, such as C2 to C4 olefins like, ethylene, propylene and butylene, to a biomass derived compound, such as dimethylfuran, furan, methylfuran. The catalyst has a relatively low silica to alumina ratio of around 25 compared with conventional catalysts which have a ratio greater than 1000. The catalyst has phosphorus and may be a beta zeolite. Such a catalyst can be used to generate a high yield of bio-based para-xylene.