Showing papers on "Catalysis published in 1977"
TL;DR: In this article, the conversion of methanol and other O-compounds to C 2 ǫC 10 hydrocarbons using a new class of shape-selective zeolites is reported.
1,250 citations
TL;DR: Organozinkchloride (I) und Arylhalogenide (II) reagieren in Gegenwart von Ni- oder Pd-Katalysatoren wie (VI) oder (VII) zu den Kupplungsprodukten (III) as mentioned in this paper.
Abstract: Organozinkchloride (I) und Arylhalogenide (II) reagieren in Gegenwart von Ni- oder Pd-Katalysatoren wie (VI) oder (VII) zu den Kupplungsprodukten (III).
713 citations
679 citations
TL;DR: A complex dependence of rate upon temperature is observed in many systems and different explanations for the existence of a rate maximum and an apparent negative activation energy are discussed in this paper, although other effects may influence the magnitude of the observed activation energy.
562 citations
472 citations
TL;DR: In this article, the catalytic behavior of silica-supported Group VIII metals in the COH2 synthesis reaction has been determined and compared to that of alumina-supported metals, and the most recent values for CO heats of adsorption on these metal surfaces were utilized to obtain this volcano plot and verify the correlation between activity and ΔH(ad) observed earlier with aluminasupported metals.
336 citations
TL;DR: In this article, a small surface area (1 cm 2 ) polycrystalline foil was used to study the CO-H 2 and CO 2 H 2 reactions at low (~10 −4 Torr) and at high (700 TorR) pressures in the same apparatus.
270 citations
TL;DR: In this article, the status of knowledge concerning open catalytic reaction systems which exhibit sustained oscillatory states was examined, and it was shown that such behavior arouses in the reader that such systems can be easily confused.
Abstract: This paper deals with the status of knowledge concerning open catalytic reaction systems which, though exposed to constant conditions, exhibit sustained oscillatory states. Such behavior arouses in...
205 citations
TL;DR: In this article, the reaction with aryl bromides with allyltributyltin in the presence of tetrakis(triphenylphosphine)palladium(O) was investigated.
Abstract: Catalytic allylation of aryl halides with allyltributyltin in the presence of tetrakis(triphenylphosphine)palladium(O) was investigated. The reaction with aryl bromides proceeded efficiently to yield allylbenzenes.
203 citations
TL;DR: In this paper, a thermal decomposition of manganese nitrate solution on a titanium or a platinum substrate was investigated mainly in 1N H2SO4 and 1N KOH.
184 citations
TL;DR: In this paper, electron energy loss spectroscopy was used to identify the chemical properties of surface intermediates on single crystal surfaces by observing the vibrations of the species with electron energy losses.
TL;DR: The mechanism of hexene-1 formation differs from that of polyethylene formation, as shown by differences in the pressure and temperature dependence of the two rates and by the inhibition by small quantities of dienes as discussed by the authors.
TL;DR: In this paper, the possible catalysis of the water gas shift reaction by metal carbonyl complexes is explored and conditions where a homogeneous solution prepared from triruthenium dodecacarbonyl (Ru/sub 3/(CO)/sub 12/) is an active catalyst under relatively mild conditions.
Abstract: The possible catalysis of the water gas shift reaction by metal carbonyl complexes is explored and conditions are described where a homogeneous solution prepared from triruthenium dodecacarbonyl (Ru/sub 3/(CO)/sub 12/) is an active catalyst under relatively mild conditions. It is additionally noteworthy that the catalyst is very active toward decomposition of formate to H/sub 2/ and CO/sub 2/ under conditions active for the water gas shift reaction.
TL;DR: In this paper, the rates of dehydrogenation of propane to propene over platinum and very dilute platinumin-gold alloys have been measured, and it is concluded that only one platinum atom is involved in the rate-determining step.
TL;DR: In this paper, a modified version of redox catalysis was found to be a modified "redox" catalysis, where O2 molecules and the products of their reaction remain strongly co-ordinated to the central metal ion of the chelates XMeII.
Abstract: The electro-reduction of oxygen is effectively catalysed by metal chelates of the N4-type. The mechanism of this process has been found to be a modified ‘redox catalysis’. O2 molecules and the products of their reaction, at least up to H2O2, remain strongly co-ordinated to the central metal ion of the chelates XMeII. The potential-determining step, which regenerates the reduced form, is the following: (XMeIII...O2H)++H++ 2e→XMeII+H2O2.
TL;DR: In this article, the synthesis of hydrocarbons from CO and H 2 was studied on a high surface area Ru Al 2 O 3 catalyst using transmission infrared spectroscopy, and a carbonyl stretching band was observed at 2043 cm −1 and attributed to CO adsorbed on Ru.
Patent•
23 Sep 1977
TL;DR: In this article, the catalysts are disclosed which have good activity and life when used to promote the conversion of hydrocarbons, carbon monoxide and nitrogen oxides contained in small concentrations in gaseous streams, to obtain the less noxious materials, carbon dioxide, water and nitrogen.
Abstract: Catalysts are disclosed which have good activity and life when used to promote the conversion of hydrocarbons, carbon monoxide and nitrogen oxides contained in small concentrations in gaseous streams, to obtain the less noxious materials, carbon dioxide, water and nitrogen. The catalysts contain a catalytically promoting, platinum group metal component, a catalytically promoting, base metal component and an alumina support component, deposited on a high surface area, particulate, macrosize carrier. The base metal component contains a metal selected from the group consisting of metals having an atomic number from 25 to 28 and rhenium.
TL;DR: In this paper, various olefins, especially those bearing electron donating groups, were successfully arylated by arenediazonium salts in the presence of a catalytic amount of palladium(O) complexes.
Abstract: Various olefins, especially those bearing electron donating groups, were successfully arylated by arenediazonium salts in the presence of a catalytic amount of palladium(O) complexes. An arylpalladium species was supposed to be an intermediate in this reaction.
01 Jan 1977
TL;DR: In this article, the authors show that reactions between substances located in an organic phase and in an aqueous phase are frequently slow and ineffective, and they propose a solution to this problem.
Abstract: Reactions between substances located partly in an organic phase and partly in an aqueous phase are frequently slow and ineffective.
TL;DR: In this paper, the role of oxygen in the reaction between nitric oxide and ammonia on a V2O5 catalyst was examined by means of ir, XPS, mass spectrometry, and kinetic studies under reaction conditions.
TL;DR: Transition metal alkynyl complexes have been prepared conveniently in high yields under mild conditions by the direct reaction of acetylenes with metal halides in the presence of catalytic amounts of copper(I) iodide in diethylamine.
Abstract: Transition metal alkynyl complexes have been prepared conveniently in high yields under mild conditions by the direct reaction of acetylenes with metal halides in the presence of catalytic amounts of copper(I) iodide in diethylamine.
TL;DR: The relative rates of heteroatom removal from model N-, S-, and O- compounds and of hydrogenation of polynuclear aromatics have been measured in competitive experiments over sulfided CoMo catalysts (300-1500 psig, 300-450 °C) as mentioned in this paper.
TL;DR: A new function derived from kinetic data, the efficiency function, can be used to quantify the efficiency of a catalyst, and three types of evolutionary improvement are discussed: the uniform binding of the substrate to the enzyme, changes in the internal thermodynamics of the bound states, and more effective catalysis of elementary steps.
Abstract: A new function derived from kinetic data, the efficiency function, can be used to quantify the efficiency of a catalyst. For freely diffusing species the maximum efficiency is unity. The enzyme triose phosphate isomerase has an efficiency of 0.6 and is thus almost a perfect catalyst. The efficiency of the acetate ion as catalyst for the same reaction is 2.5 × 10−11. This increase in catalytic efficiency is discussed in terms of three types of evolutionary improvement: the uniform binding of the substrate to the enzyme, changes in the internal thermodynamics of the bound states, and more effective catalysis of elementary steps. These concepts are illustrated for triose phosphate isomerase.
TL;DR: Alkylation, arylation, and vinylation of acyl chlorides by means of organotin compounds in the presence of catalytic amounts of tetrakis(triphenylphosphine)palladium(O) were demonstrated in this paper.
Abstract: Alkylation, arylation, and vinylation of acyl chlorides by means of organotin compounds in the presence of catalytic amounts of tetrakis(triphenylphosphine)palladium(O) were demonstrated. The corresponding ketons were obtained in fairly good yields.
TL;DR: In this paper, the surface area of unsupported and supported molybdena has been estimated using the ratio of total area to chemisorbed oxygen, which is about one-fourth of the total area.
TL;DR: In this paper, the interaction of allyl iodide with MoO 3, Bi 2 O 3, and molybdates of Bi, Co, and Mg has been studied in the temperature range of 270-480 °C.
Patent•
02 Nov 1977
TL;DR: In this article, a catalytic hydroconversion process for a hydrocarbonaceous oil is effected by dissolving an oil-soluble metal compound in the oil, converting the compound to a solid, non-colloidal catalyst within the oil and reacting the oil containing the catalyst with hydrogen.
Abstract: A catalytic hydroconversion process for a hydrocarbonaceous oil is effected by dissolving an oil-soluble metal compound in the oil, converting the compound to a solid, non-colloidal catalyst within the oil and reacting the oil containing the catalyst with hydrogen. Preferred compounds are molybdenum compounds.