摘要:
A molded catalyst body that contains in a reduced state a metal of the ferrous group and/or copper on a support and is characterized by the following features:(a) Metal content: about 5 to about 40 weight percent, based on the total weight of the catalyst;(b) Metal-crystal size: .ltoreq.3 nm;(c) Volume of the pores with a diameter of 7.5 nm to 15 .mu.m: 0.05 to 0.9 ml/g catalyst;(d) BET surface area: 80-400 m.sup.2 /g catalyst;(e) Fracture strength: >30N (based on cylindrical molded body with a diameter of 1.5 mm and a length of 5 mm);(f) Bulk density: 250-350 g/l.
摘要:
An SiO.sub.2 -containing copper oxide-chromium oxide catalyst is obtained through heat treatment of copper oxide and chromium oxide, or of a precursor compound convertible into copper oxide or chromium oxide in the presence of an SiO.sub.2 component; it is characterized by the fact that, after the heat treatment,(a) the intensity ratio between the X-ray diffraction lines (XRD reflexes) of the copper oxide with d=0.232 nm and of the CuCr.sub.2 O.sub.4 spinel with d=0.240 nm formed through heat treatment, determined as the ratio of the reflex amplitudes, is 0.7 to 4.0:1, and(b) the copper mass, which is dissolved by stirring 10 g of the catalyst in 100 ml of 10 weight percent acetic acid at 20.degree. C. for 2 minutes, amounts to a maximum of 200 mg.
摘要:
A catalyst for decreasing the content of nitrogen oxides in flue gases. The catalyst contains at least one of the metals titanium, zirconium, vanadium, tungsten, molybdenum, or cerium in the form of one or more of their oxides combined with a silicate with a three-layer structure (three-layer silicate). The three-layer silicate is acid-activated while essentially retaining its crystalline layer structure. The three-layer silicate has a cation-exchange capacity of 30 mvals/100 g or more before acid activation. The acid activation lowers the concentration of interlayer cations and increases the BET surface at least 15% and preferably at least 50% in terms of the BET surface of the three-layer silicate before acid activation. The atomic ratio of the silicon in the acid-activated three-layer silicate to the metal in the oxide is from 0.2 and 50 and preferably from 0.4 to 25.
摘要:
A catalyst for the hydrogenation of carboxylic acid alkyl esters to higher alcohols which in the oxide form comprises a chemical composition represented by the formulaCuZn.sub.0.5-2 Mn.sub.0.01-0.5 O.sub.xwherein x is the number of oxygen atoms needed per formula unit for electrical neutrality.
摘要:
Acid-resistant copper oxide-chromium oxide catalysts for hydrogenation of fatty acids or fatty acid mixtures and/or the esters thereof are obtained through heat treatment of copper oxide and chromium oxide or of precursor compounds that are convertible into copper oxide or chromium oxide and which contain aluminum zirconium, cerium and/or lanthanum oxide as an additional metal component. The acid resistance is defined by the fact that the amount of copper which is dissolved by stirring 10 g of the catalyst for 2 minutes in 100 ml of 10 weight percent acetic acid at 20.degree. C., is a maximum of 200 mg.
摘要:
A catalyst for decreasing the content of nitrogen oxides in flue gases. The catalyst contains at least one of the metals titanium, zirconium, vanadium, tungsten, molybdenum, or cerium in the form of one or more of their oxides combined with a silicate with a three-layer structure (three-layer silicate) selected from the group consisting of illite and mica. The atomic ratio of the silicon in the three-layer silicate to the metal in the oxide is from 0.2 and 50 and preferably from 0.4 to 25.
摘要:
The invention relates to a catalyst for conversion of carbon monoxide with steam into hydrogen, carbon dioxide and hydrogen-rich synthesis gases. The conversion can be done at temperatures above roughly 300.degree. C. In addition, a chromium-free catalyst for the aforementioned purpose is described which contains the following in "application form:" (a) 30-98% by weight iron oxide, computed as Fe.sub.2 O.sub.3 ; (b) 0.1-20% by weight copper oxide, computed as CuO; (c) 0.1-20% by weight of an oxide of the rare earth levels computed as Me.sub.2 O.sub.3 (in which Me is a rare earth metal) and/or zirconium oxide, computed as ZrO.sub.2 ; (d) 0.1-30% by weight of at least one oxide of one or several other base metals with an ionic radius from 50 to 72 pm (other than chromium) (e) 0-0.1% by weight of at least one oxide of one or several precious metals from the platinum group; (f) 0-30% by weight barium oxide.
摘要:
A ferruginous catalyst for decreasing the content of nitrogen oxide in flue gases. The catalyst comprising an active constituent in the form of a combination of a compound of iron and of an acid aluminosilicate that has a layered structure.
摘要:
A catalyst for decreasing the content of nitrogen oxides in flue gases. The catalyst contains at least one of the metals titanium, zirconium, vanadium, tungsten, molybdenum, or cerium in the form of one or more of their oxides combined with a silicate with a three-layer structure (three-layer silicate) which is or comprises talc. The three-layer silicate is preferably acid-activated while essentially retaining its crystalline layer structure and being not yet X-ray amorphous. The acid activation increases the BET surface area at least 15% and preferably at least 50% in terms of the BET surface area of the talc before acid activation. The atomic ratio of the silicon in the talc to the metal in the oxide is from 0.2 and 50 and preferably from 0.4 to 25.
摘要:
A catalyst for the conversion of carbon monoxide which before reductive activation, has the chemical composition which corresponds to the formulaCu.sub.0.04-6 AlMg.sub.0.1-10.sup.O.sub.X,wherein x denotes the number of oxygen atoms required to maintain electroneutrality per formula unit; and wherein the intensity ratio between the x-ray diffraction lines of the spinels CuAl.sub.2 O.sub.4 and MgAl.sub.2 O.sub.4 at d=0.244 nm and copper oxide at d=0.232 nm, determined as the ratio of reflex heights is about 0.05 to 0.5.
摘要翻译:用于转化一氧化碳的催化剂,其在还原活化之前具有对应于式Cu0.04-6AlMg0.1-10OX的化学组成,其中x表示维持每个式单元的电中性所需的氧原子数; 并且其中d = 0.244nm处的尖晶石CuAl 2 O 4和MgAl 2 O 4的x射线衍射线与d = 0.232nm处的氧化铜之间的强度比确定为反射高度的比率为约0.05至0.5。