Thermocatalytic conversion of petroleum paraffin in the presence of tungsten carbide powders

Russia occupies the third place in the world in terms of stocks of heavy oil raw materials. The development of deposits of light and medium oils makes it inevitable to involve heavy, as well as residual, petroleum raw materials in processing to meet the growing demand for petroleum products. Increase of the depth of oil processing possible in various ways, one of which is the use of new efficient catalysts, resistant to corrosion, poisoning and coking. Tungsten carbide, meeting these requirements, is a promising starting compound for the production of cracking catalysts for heavy oil feedstocks. The influence of tungsten carbide and its calcination temperature on the composition and yield of oil paraffin cracking products on the resulting catalysts was studied to investigate its catalytic activity, the optimum treatment temperature of tungsten carbide was determined. The high catalytic activity of a WC sample calcined at 420°C is shown. Using the physicochemical methods of investigation, the properties of tungsten carbide samples, as well as the composition and properties of the paraffin cracking products in the presence of the catalysts obtained, were studied

Thermal cracking of heavy residues in the presence of catalytic systems modified by polyoxomolybdate compounds

The paper is devoted to research of properties, activities of synthesized catalytic systems modified with polyoxomolybdate compounds. A number of physicochemical methods studied the obtained catalysts: scanning electron microscopy, trace element analysis of surfaces, X-ray phase analysis, X-ray diffraction analysis. It was found that the synthesized systems are active in the process of thermocatalytic cracking

Effect of pre-oxidation of dispersed catalysts on heavy oil cracking

Heavy and extra-heavy oils are characterized by a high content of resins, asphaltenes, and sulfur, which hinders oil refining. The purpose of this paper is to study the effect of NiCrWC catalyst surface pre-oxidation on the composition of products of heavy oil catalytic cracking. The optimal conditions for the pre-oxidation of the catalyst are a temperature of 450 C and a duration of 2 hours in air. The products of catalytic cracking are analyzed by content of saturated and aromatic hydrocarbons, resins and asphaltenes, gas chromatography, X-ray diffraction, and scanning electron microscope spectrometry methods. Pre-oxidation of a NiCrWC catalyst at 450 C leads to a decrease in the content of macromolecular components, sulfur, by-products, and an increase in the yield of a fraction with a boiling point up to 360 C. The decrease in sulfur content in the course of heavy oil upgrading is caused both by the interaction of metal oxides on the surface of NiCrWC with S-containing compounds of the feedstock, and by the removal of sulfur in the form of gas. A hypothetical mechanism for the cracking of heavy oil components over pre-oxidized catalysts is proposed

Transformation of asphaltenes of vacuum residues in thermal and thermocatalytic processes

The work deals with the study of high molecular weight components of oils, namely with asphaltenes. The relevance of research aimed at studying the structural changes and thermal properties of asphaltenes under the conditions of heavy residual feedstock processing increases every year. It has been shown that the addition of NiCr-WC promotes the retardation of gas formation and an increase in the destruction of resins and asphaltenes of the vacuum residue.The average diameter of the aromatic layers (La) increases from 8.10 to 10.58 Å in the cluster and decreases the number of aromatic layers in a cluster (M) and the average height of a cluster of aromatic layers (Lc) from 7.58 to 5.09 and 26.70 to 18.34Å respectively in the series ‘initial asphaltenes – asphaltenes after thermal processing – asphaltenes after thermocatalytic processing. Based on differential scanning calorimetry in the temperature range 400–700 C, the destruction of asphaltenes is accompanied not only by the formation of low molecular weight hydrocarbon structures but the intensive removal of heteroatoms (S and N)

Текстурные свойства, фазовый состав и морфология Ni-Mo /γ-Al2O3 содержащих систем

The synthesis of supported systems containing Ni and Mo has been carried out. The support was an industrial powder of aluminum oxide (γ-Al2O3) obtained from pseudoboehmite by heat treatment. One of the key features is the use of an alcoholic solution of molybdenum blue obtained using the mechanical activation method as a source of molybdenum. The synthesized systems are supposed to be used in hydroprocesses for the processing of crude oil in order to remove heteroatomic compounds (in particular, sulfur- and nitrogen- containing ones). The physicochemical properties of the obtained samples were also observed, It was shown that the morphology of the support is completely inherited from the predecessorПроведен синтез нанесенных систем, содержащих Ni и Mo. В качестве носителя выступал промышленный порошок оксида алюминия (γ- Al2O3), полученный из псевдобемита методом термической обработки. Одной из ключевых особенностей является использование в качестве источника молибдена спиртового раствора молибденовой сини, полученной с привлечением метода механоактивации. Синтезированные системы предполагается использовать в гидропроцессах переработки нефтяного сырья с целью удаления гетероатомных соединений (в частности серо- и азотсодержащих). Также были исследованы физико- химические свойства полученных образцов, было показано, что морфология носителя полностью наследуется от предшественник

Thermocatalytic conversion of petroleum paraffin in the presence of tungsten carbide powders

Russia occupies the third place in the world in terms of stocks of heavy oil raw materials. The development of deposits of light and medium oils makes it inevitable to involve heavy, as well as residual, petroleum raw materials in processing to meet the growing demand for petroleum products. Increase of the depth of oil processing possible in various ways, one of which is the use of new efficient catalysts, resistant to corrosion, poisoning and coking. Tungsten carbide, meeting these requirements, is a promising starting compound for the production of cracking catalysts for heavy oil feedstocks. The influence of tungsten carbide and its calcination temperature on the composition and yield of oil paraffin cracking products on the resulting catalysts was studied to investigate its catalytic activity, the optimum treatment temperature of tungsten carbide was determined. The high catalytic activity of a WC sample calcined at 420°C is shown. Using the physicochemical methods of investigation, the properties of tungsten carbide samples, as well as the composition and properties of the paraffin cracking products in the presence of the catalysts obtained, were studied