摘要:
Catalyst for dealkylating, in the presence of steam, a hydrocarbon charge, obtained for example from a catalytic reforming unit or from a unit for the production of aromatic hydrocarbons, and containing at least one alkylaromatic hydrocarbon such as toluene or a xylene, said catalyst containing an alumina carrier of a specific surface higher than 50 m.sup.2 /g and, by weight with respect to the catalyst, from 0.1 to 2% of rhodium, from 0.05 to 2% of at least one metal selected from copper, silver and gold, from 0.05 to 2% of rhenium and from 0.02 to 5% of at least one additional metal selected from lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium, barium and uranium.
摘要:
An amorphous solid gel containing molybdenum and iron contains (a) ions of a ferric salt and ions from at least one salt containing, as simple cations, a metal M, in an atomic ratio M/ (Fe+M) from 0 to 0.5:1 (b) ions from a molybdic compound and ions from at least one salt containing, as oxygenated ions, a metal N, in an atomic ration N/ (Mo+N) from 0 to 0.5:1; and (c) water, wherein M is Co, Ni, Mn, Cr, Sc, Y or a rare earth metal, N is Cr, W, Mn, or V and (Mo+N) / (Fe+M) is 0.4:1 to 5:1.
摘要:
Catalyst for dehydrogenating hydrocarbons, as manufactured by the process comprising:Admixing one or more iron compounds, chromium compounds and potassium compounds, in a definite range of relative proportions,Moistening and malaxing the resulting mixture while adding thereto a clayish material in such an amount as to obtain by reaction with the potassium compound, a proportion of 3 to 55% b.w. of potassium alumino-silicate in the final catalyst,Shaping the homogeneized resulting paste, drying and roasting it at about 870 - 1050.degree. C, the potassium compound being used in an amount greater than that liable to combine with the clayish material.
摘要:
A process is described for synthesizing hydrocarbons from a mixture comprising carbon monoxide and hydrogen in the presence of a catalyst comprising at least one group VIII metal supported on a silica-alumina prepared by co-precipitating and calcining at a temperature in the range from about 500° C. to about 1200° C. for at least 6 hours so that said silica-alumina has a specific surface area of less than 260 m2/g. Said catalyst is used in a fixed bed or in suspension in a liquid phase of a three-phase reactor.
摘要:
A monolithic honeycomb-type structure useful in particular as a particle filter for exhaust gases from diesel engines has a number of passages that empty into the end faces of said monolith, but are alternately open and sealed. The monolith consists of a porous refractory material that comprises: 70 to 97% by mass of &agr; and/or &bgr; crystallographic-type silicon carbide that has at least one particle size and preferably at least two particle sizes, and 3 to 30% by mass of at least one bonding ceramic phase in the form of a micronic powder or particles that are obtained by atomization, comprising at least one simple oxide, for example, B2O3, Al2O3, SiO2, MgO, K2O, Li2O, Na2O, CaO, BaO, TiO, ZrO2 and Fe2O3 and/or at least one mixed oxide, for example, the alkaline aluminosilicates (of Li, Na, or K) or alkaline-earth aluminosilicates (of Mg, Ca, Sr or Ba), clays, bentonite, feldspars or other natural silico-aluminous materials. The production of the monolith comprises a calcination stage under an oxygen-containing atmosphere at a temperature up to 1650° C., but less than 1550° C.
摘要翻译:特别是作为来自柴油发动机的废气的颗粒过滤器的整体式蜂窝型结构具有多个通向所述整体料的端面的通道,而是交替地开放和密封。 整料由多孔耐火材料组成,其包括:具有至少一个粒度,优选至少两个粒度的70和97质量%的α和/或β晶型碳化硅,和3至30质量% 至少一种微晶粉末形式的结合陶瓷相或通过雾化获得的颗粒,其包含至少一种简单的氧化物,例如B2O3,Al2O3,SiO2,MgO,K2O,Li2O,Na2O,CaO,BaO, TiO,ZrO 2和Fe 2 O 3和/或至少一种混合氧化物,例如碱性硅铝酸盐(Li,Na或K)或碱土金属硅酸盐(Mg,Ca,Sr或Ba),粘土,膨润土,长石 或其他天然硅铝质材料。 整料的生产包括在含氧气氛下在高达1650℃但小于1550℃的温度下的煅烧阶段
摘要:
The present invention relates to the use of a catalyst comprising an extruded essentially alumina-based support, constituted by a plurality of juxtaposed agglomerates and partially in the form of packs of flakes and partially in the form of needles, and optionally comprising at least one catalytic metal or a compound of a catalytic metal from group VIB, and/or optionally at least one catalytic metal or compound of a catalytic metal from group VIII, in an ebullating bed process and for hydrorefining and hydroconverting hydrocarbon feeds.
摘要:
The invention concerns a process for reducing the benzene content of petrol fractions, in which hydrogenation is carried out on a feed with the following composition by weight: 40% to 80% of paraffins, 0.5% to 7% of cyclic hydrocarbons and 6% to 45% of aromatics, and with a maximum distillation temperature of between 70.degree. C. and 90.degree. C., followed by isomerisation of the effluent from the hydrogenation step, mixing said feed and/or said effluent with a C.sub.5 -C.sub.6 cut; said process being characterised in that an isomerisation catalyst is used which contains chlorine and at least one group VIII metal deposited on a support composed of a mixture of specific proportions of eta alumina and gamma alumina.
摘要:
A process for the recovery of mercury and arsenic for which elementary mercury and/or mercury mercaptides are recovered prior to the recovery of arsenic and wherein the recovery temperature of the arsenic is higher than the recovery temperature of the mercury.
摘要:
A solid mass for the recovery of mercury, comprising a solid mineral support or dispersant, essentially copper and sulphur at least partly in the form of copper sulfide is produced by the following stages:a) at least one copper compound other than a sulphide is incorporated into a solid mineral dispersant or carrier,b) the product obtained in stage (a) is calcined in order at least partly to convert the copper compound or compounds which it contains into copper oxide (CuO and/or Cu.sub.2 O),c) the product obtained in stage (b) or in stage (a) if there has not been a stage (b) is brought into contact with elementary sulphur,d) the product resulting from stage (c) referred to as the precursor, is subjected to a thermal treatment in a non-oxidizing atmosphere and accompanied by gas scavenging, to a temperature and for a sufficient time to allow the formation of sulphide of the metal(s) present.
摘要:
The invention relates to a process for the production of hydrogen by steam reforming of methanol, in which water and methanol are reacted (4), under relatively high pressure, over a suitable catalyst. The gases emitted from the reaction are contacted (10), after condensation (7) under relatively high pressure, with an adsorption agent, such that the byproducts of the reaction are adsorbed and a hydrogen-rich gas is liberated (11). Also, byproducts which are recycled to the steam reforming reactor (4), are periodically desorbed under relatively low pressure at along with a fraction of the hydrogen present in the adsorption zone (10), after being submitted to recompression (13) and removal (14), under relatively high pressure, of at least a portion of carbon the dioxide, the desorbed gas fraction is recycled to the steam reforming reactor.