摘要:
Thermally stable, sulfur-resistant catalysts for the conversion of exhaust gases from internal combustion engines includes an inert, rigid support substrate, e.g., a cellular monolith, coated with a layer of porouse material, the porous material containing alumina, at least one rare earth oxide, and a spinel type compound having a specific surface of at least 50 m.sup.2 /g, and the support substrate having an effective amount of a catalytically active phase impregnated onto the porous coating thereof.
摘要:
A multifunctional catalyst, a method of preparing the catalyst and the use of the catalyst in treating exhaust fumes from internal combustion engines are described. The catalyst includes a porous layer containing (weight %, dry):about 50 to about 99.7% of at least one refractory inorganic oxide,about 0.1 to about 25% of at least one uranium oxide,about 0.1 to about 35% of at least one oxide of at least one metal P selected from the group consisting of lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium, barium, lanthanum, praseodymium, neodymium, gadolinium, and yttrium andabout 0.1 to 20% of a metal A selected from the group consisting of platinum, rhodium, palladium, ruthenium, iridium, and mixtures thereof.
摘要:
A pollution control catalyst for a catalytic converter comprising the exhaust system of an internal combustion engine, said catalyst including a refractory oxide support, and an activated phase therefor comprised of 0.3 to 7% by weight cerium based upon the weight of said support, 0.1 to 3.5% by weight iron, also based upon the weight of said support, at least one platinum or palladium metal, and at least one iridium or rhodium metal.
摘要:
A process for sweetening a petroleum cut containing mercaptans, wherein said petroleum cut is subjected to oxidation conditions by being contacted with a porous catalyst, in the presence of air said process being characterised in that said catalyst comprises 10 to 98% by weight of at least one mineral solid phase constituted of an alkaline aluminosilicate with a Si/Al atomic ratio less than or equal to 5, 1 to 60% by weight of active carbon, 0.02 to 2% by weight of at least one metal chelate and 0 to 20% by weight of at least one organic or mineral binding agent, has a basicity determined according to the 2896 ASTM standard with 20 milligrams of potash per gram and a total BET surface area of 10 m.sup.2 g.sup.-1, and contains inside its pore structure a permanent aqueous phase representing 0.1 to 40% by weight of dry catalyst.
摘要翻译:一种用于甜化含有硫醇的石油馏分的方法,其中所述石油馏分通过与多孔催化剂接触而经受氧化条件,在空气存在下,所述方法的特征在于所述催化剂至少包含10至98重量% 一个矿物固相由Si / Al原子比小于或等于5,1-60重量%的活性炭,0.02-2重量%的至少一种金属螯合物和0-20重量%的碱性硅铝酸盐构成, 的至少一种有机或矿物结合剂,具有根据2896 ASTM标准确定的碱度,每克20mg的钾碱和10m 2 g -1的总BET表面积,并且在其孔结构内部含有永久性水性 相为干燥催化剂的0.1-40重量%。
摘要:
The present invention relates to a process for preparing a precursor of a catalyst containing copper, aluminum and zinc.This precursor is formed by the mixing of two ternary precursors, at different stages of their manufacturing, these two ternary precursors being different from one another in their metallic stoichiometry (atomic ratios between Cu, Zn and Al), in their crystallographic structure and in their elemental morphology.The catalyst obtained from this precursor can be used in particular for the synthesis of methanol.
摘要:
The present invention relates to a process for preparing a precursor of a catalyst containing copper, aluminum and zinc.This precursor is formed by the mixing of two ternary precursors, at different stages of their manufacturing, these two ternary precursors being different from one another in their metallic stoichiometry (atomic ratios between Cu, Zn and Al), in their crystalographic structure and in their elemental morphology.The catalyst obtained from this precursor can be used in particular for the synthesis of methanol.
摘要:
The invention relates to a process for the production of hydrogen by catalytic reforming of methanol with water vapor. A mixture of methanol, water and carbon dioxide is passed in contact with a catalyst, containing copper, in a fixed bed, in a catalytic zone, at a temperature comprised between 150.degree. and 400.degree. C., the molar ratio of the carbon dioxide to the methanol, at the entrance of the catalytic zone, being comprised between 0.001 and 0.2.
摘要:
A catalyst for the steam dealkylation of aromatic hydrocarbons, comprising a carrier and 3 metals, is regenerated in the reaction zone containing the catalyst bed, after disconnection of said zone from the producing unit, by proceeding to the successive steps of: scavenging said zone with hydrogen and then with an inert gas, progressively replacing said inert gas by a gas containing molecular oxygen, burning the catalyst at a temperature lower than 650.degree. C. so as to calcine the carbon deposits of the catalyst, passing through the catalyst bed an air stream containing halogen to increase the halogen content of the catalyst, calcining by means of an air stream at a temperature of 300.degree.-600.degree. C. and purging with an inert gas before reconnecting said reaction zone to the producing unit.
摘要:
The invention relates to an ergonomic body for a personal firearm comprising two horizontally-adjacent parallel barrels. Said body gives a particularly ergonomic grip thanks to the use of a central stock (1) under which three handles are arranged, a central handle (2) and a handle at each end. The front handle (3) has a triple role in shooting ergonomics, as common cocking lever for both barrels and integrated gun rest. The central handle (2) provides a rapid selection of the barrel thanks to a selector (16) placed beneath the trigger guard and an increase in the lazed shooting range by means of an ergonomic selector (64) operated by the shooter's thumb. The rear handle (4) combines the housing of two magazines (22 & 23) with the function as a butt. A telescopic bayonet (13) also provides a flame-catching function in the employed position. The body also comprises a recoil shock absorber on firing ammunition with high specific power, which functions using the propellant gases.
摘要:
A process for hydrotreating a hydrocarbon feed, comprising subjecting said feed to hydrotreating conditions in the presence of a catalyst comprising an essentially alumina-based extruded support, essentially constituted by a plurality of juxtaposed agglomerates, optionally at least one catalytic metal or a compound of a catalytic metal from group VIB (group 6 of the new periodic table notation) and/or optionally, at least one catalytic metal or a compound of a catalytic metal from group VIII (group 8, 9 and 10 of the new periodic table notation), in which the sum S of the group VIB and VIII metals, expressed as the oxides, is 0% to 50% by weight, and wherein each of these agglomerates is partly in the form of packs of flakes and partly in the form of needles, said needles being uniformly dispersed both about the packs of flakes and between the flakes, in which the alumina agglomerates are obtained by forming a starting alumina originating from rapid dehydration of hydrargillite and in which the amount of alumina from boehmite decomposition is 5% to 70% by weight.