Hydropolymerization Of Ethylene Research Articles

Synthesis Co-B/Al-MCM-41 with the change of Al/Si ratios for ethylene hydropolymerization

In the research, catalyst activity of Al-MCM-41 with different ratios of Al/Si are compared by observing catalyst samples that successfully synthesized. The ratio 30 of Al/Si was selected for impregnation process with Co to obtain the formation of 5.0% Co/Al-MCM-41, 7.5% Co/Al-MCM-41, 10% Co/Al-MCM-41, 15% Co/Al-MCM-41 and15% Co/Al-MCM-41. Through experiments, 10% Co/Al-MCM-41 sample was advisable to added with B. for evaluation of metal dispersion on carrier surface. Liquid fuel products were obtained by using . 10% Co-0.6% B/Al-MCM-41 catalyst. Hydropolymerization of ethylene under low temperature (190°C) and normal pressure (1atm) was clearly accelerated by 10% Co-0.6% B/Al-MCM-41. This would be a positive sign for fuel industry to convert ethylene, CO and H2 into valuable products.

Synthesis and characterization of Co-B/Al-SBA-15 for ethylene hydropolymerization

In this paper, 0.6%B-10%Co/Al-SBA-15 was used as catalyst for hydropolymerization of ethylene at low temperature and medium pressure. Remarkable performance was shown in process that Ethylene, CO and H2 were transformed into liquid fuel. Especially, liquid fuel occupied a large proportion of products. For productivity and characteristic evaluation purposes, three ratios of Si/Al (20; 40 and 60) were selected for research on Al-SBA-15. Al-SBA-15 with ratio of Si/Al= 40 was found to be the most suitable sample for continuous impregnation of Co with four ratios 5.0%Co/Al-SBA-15, 7.5%Co/Al-SBA-15, 10%Co/Al-SBA-15, 15%Co/Al-SBA-15 respectively. For catalyst advancement, B was added to 10%Co/Al-SBA-15 with a ratio of 0.6%. As experiment result, 10%Co-0.6%B/Al-SBA-15 is the most satisfactory sample catalyst in the research that should be used as catalyst for hydropolymerization process of Ethylene.

Catalytic hydrocondensation of carbon monoxide with olefins and their hydropolymerization under the effect of carbon monoxide and oxygen. Communication 58. Hydropolymerization of ethylene in the presence of Co-Carbonyl catalysts

1. Catalysts prepared by application of dicobalt octacarbonyl on different carriers are active in CO hydropolymerization of ethylene. 2. The maximum yield of aromatic and isoparaffin hydrocarbons is obtained on a Co-Pentasil catalyst.

Effect of the nature of the support on the activity of Co catalysts in the low-temperature hydropolymerization of ethylene initiated by carbon monoxide

1. Cobalt catalysts containing the oxides of aluminum, magnesium, beryllium, and silicon exhibit significant activity in the hydropolymerization of ethylene, initiated by CO at 80°C. The most active catalysts are those in which the dispersity of the Co is greater than 5· 10−3 and the adsorption of CO on these catalysts exceeds 8 · 10−2 mmole/g Co. 2. The activity of the cobalt catalysts is dependent on the width of the forbidden band of the support.

Catalytic hydrocondensation of carbon monoxide with olefins and their hydropolymerization by the action of carbon monoxide and hydrogen 55. Hydropolymerization of ethylene intiated by CO on cobalt catalysts containing high-silica zeolite

1. Pentasil high-silica zeolite-base cobalt catalysts are active in the hydropolymerization of ethylene initiated by carbon monoxide and their activity increases with decreasing zeolite modulus. 2. Aromatic compounds are formed under ethylene hydropolymerization conditions on cobalt-Pentasil catalysts. 3. A correlation was found between the activity of these cobalt catalysts in ethylene hydropolymerization and the chemisorption of carbon monoxide.

Effect of type of a luminosilicate support for Co catalyst on the initiating effect of carbon monoxide in the hydropolymerization of ethylene

1. The course of the ethylene hydropolymerization reaction at 190 and 70°, respectively, initiated by 5 and 0.01% CO, depends to a substantial degree on the type of aluminosilicate support for the Co catalyst. 2. In general, both the yield of the hydropolymerization products and its selectivity with respect to hydrocarbons with a high molecular weight change in the same manner as the SiO2 /Al2O3 mole ratio in the aluminosilicate support.

Effect of adding ammonia on synthesis of hydrocarbons from carbon monoxide, hydrogen, and ethylene

The addition of small amounts of ammonia to the reaction zone increases the yield of high-molecular hydrocarbons in the synthesis from CO and H2, and also in the hydropolymerization of ethylene, initiated by CO.

Accelerating effect of carbon monoxide as a function of its concentration and the reaction temperature during hydropolymerization of lower olefins

The accelerating effects of carbon monoxide in the hydropolymerization of ethylene and propylene in the presence of Co-clay catalyst depend both on its concentration and the reaction temperature.

Activity of Co catalysts, deposited on zeolites, in the hydropolymerization of ethylene, initiated by carbon monoxide at ?200�

The Co-zeolite (1∶2) catalysts are active in the hydropolymerization of ethylene, which is initiated by carbon monoxide in the presence of hydrogen at 190–200°. The course of the reaction is strongly dependent on the reaction conditions.

Hydropolymerization of ethylene, initiated by carbon monoxide, on Co-zeolite catalysts at temperatures below 100�C

Both the extent of C2H4 hydropolymerization, initiated by 0.01% CO, on Co zeolites at a temperature below 100°C, and the initiating effect increase symbatically with increase in the ratio of SiO2/Al2O3 in the zeolite in the investigated limits (from 2 to 10).

The catalytic hydrocondensation of carbon monoxide with olefins and their hydropolymerization under the action of carbon monoxide and hydrogen

1. Co-ZnO catalysts are active in the hydropolymerization of ethylene initiated by carbon monoxide at 180–190dg and atmospheric pressure. Their activity depends to a substantial degree on the method of preparation. 2. In composition and properties, the hydropolymerizate is close to the catalyzates obtained in the hydropolymerization of ethylene under analogous conditions on other Co-catalysts.

Use of labeled14C carbon monoxide to study the formation of methane in the catalytic hydropolymerization of ethylene initiated by carbon monoxide

By using radioactive carbon monoxide it was shown that in the initial step of the reaction for the hydropolymerization of ethylene in the presence of hydrogen, initiated by carbon monoxide, at 190°, the formation of methane is the result of the hydrocracking of ethylene or of the hydrocarbons derived from it.

Hydropolymerization of ethylene initiated by oxygen in the presence of Co-zeolite catalysts

Hydropolymerization of ethylene initiated by oxygen in the presence of Co-zeolite catalysts

Study of catalytic ethylene hydropolymerization, initiated by14C-labeled carbon monoxide, at temperatures below 100?

1. Employing14C-labeled carbon monoxide we studied the hydropolymerization of ethylene, which proceeds at a temperature below 100‡ in the presence of 0.01%14CO. It was shown that the reaction products contain from 1 · 10−3 to 1 · 10/s-5% of carbon from the CO. 2. Oxygen-containing compounds are not formed in the ethylene hydropolymerization process.

Activity of Co catalysts, deposited on Vietnam clays of kaolinite and chlorite type, in reaction for the hydropolymerization of ethylene initiated by carbon monoxide

The catalysts: Co-Vietnam white kaolinite clay (1∶2) and Co-Vietnam chlorite clay (1∶2), are active in the reaction for the hydropolymerization of ethylene, initiated by carbon monoxide.

Investigation of the catalytic hydropolymerization of ethylene in the presence of C14-labeled carbon monoxide

1. It was shown using radioactive carbon monoxide that the negligible consumption of CO under conditions of hydropolymerization of ethylene on a cobalt catalyst at 190° is not accompanied by regeneration of CO during the reaction. The carbon atoms from CO are incorporated into one of several dozen newly formed molecules. 2. The molar radioactivity, averaged over the fractions of hydrocarbons, varies correspondingly to the change in the molecular weight (with the exception of the C4 fraction); the possible causes of this phenomenon are discussed. 3. Under the conditions of hydropolymerization of ethylene with labeled carbon monoxide, the greatest radioactivity is detected inα-olefins and the corresponding saturated hydrocarbons;β-olefins have a lower molar radioactivity and are obtained primarily in the cis-form. 4. A small difference is observed in the distribution of carbon from CO among hydrocarbons when it is weakly or intensively consumed in the reaction.

On the catalytic hydrocondensation of carbon monoxide with olefins and their hydropolymerization under the action of carbon monoxide and hydrogen

1. It was shown by the method of capillary gas-liquid chromatography that the composition of the C5 and C6 fractions of the products of hydropolymerization of ethylene under the action of carbon monoxide at 190° on a cobalt catalyst depends upon the presence of a promoter (ZrO2 +MgO) and especially upon the nature of the carrier. 2. Kieselguhr as the carrier promotes the formation of larger amounts ofβ-olefins in comparison with clay. 3. The quantitative ratio of hydrocarbons of normal and iso-structure is ∼2∶1 in the C5 fraction and ∼ 1∶1 in the C6 fraction, independent of the composition of the catalyst.

Catalytic hydrocondensation of carbon monoxide with additions of dioxides of metals of the titanium subgroup of the latter under the action of carbon monoxide and hydrogen Communication 43. Activity of cobalt catalysts with additions of dioxides of metals of the titanium subgroup

1. A Co-clay catalyst is twice as active as a Co-kieselguhr catalyst for the hydropolymerization of ethylene under the action of small amounts of CO in presence of H2. 2. Additions of ThO2, ZrO2, and TiO2 promote a Co-MgO-kieselguhr catalyst. ThO2 and ZrO2 promote, but TiO2 deactivates a Co-kieselguhr catalyst. All these oxides deactivate, a Co-clay catalyst.

Catalytic hydrocondensation of carbon monoxide with olefins and their hydropolymerization under the action of carbon monoxide and hydrogen Communication 42. Hydrocopolymerization of ethylene with its homologs

1. In the hydrocopolymerization of ethylene and its homologs (propene, butene, and isobutene) at 190° and atmospheric pressure under the action of small amounts of carbon monoxide in presence of hydrogen the ethylene homolog participates in the reaction only when it is in excess over ethylene in the original gas mixture; ethylene enters this reaction 2–3 times more readily than propene and butene and 3–5 times more readily than isobutene. 2. In the hydropolymerization of ethylene the cobalt-clay catalyst becomes deactivated for the subsequent reaction of isobutene, as it also does for the reactions of butene and propene.

Catalytic hydrocondensation of carbon monoxide with olefins and their hydropolymerization under the action of carbon monoxide and hydrogen

1. Co-MgO catalysts are active in the hydropolymerization of ethylene initiated by carbon monoxide at 170–200°, and their activity depends on the method of preparation. 2. Co-Al2O3 (1∶2) catalysts possess high activity in the indicated reaction, not inferior to the activity of Co-clay and Co-aluminum hydroxide catalysts and independent of the temperature of calcination of the carrier (aluminum oxide or hydroxide) up to 800°.