Conversion of gas condensate on zinc-containing Ultrasil type high-silica zeolite

Mamedov, S. E.; Ахмедов, Э. И.; Dadasheva, S. S.; Akhmedova, N. F.

doi:10.1134/s0965544116070112

Cited by 2 publications

(7 citation statements)

References 7 publications

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“…The catalysts were prepared from ZSM-5 with a SiO2/Al2O3 molar ratio of 58, which was converted by ion exchange into the NH4-form according to the pro cedure described previously [4] . The H form of zeolite was prepared by thermal decomposition of the NH4-form at 500°C for 4 h. The modified catalysts were prepared by impregnating ZSM-5 with a certain amount of a cuprum acetate aqueous solution at 80°C for 4 h. The samples were successively dried for 16 h in air and 4 h in an oven at 110°C and finally calcined for 4 h in a muffle furnace at 550°C.…”

Section: Experimental Partmentioning

confidence: 99%

“…Bizeolite catalysts exhibit higher selectivity for C2-C4 alkenes than mono-zeolitic catalysts [6]. The addition of Zn-H-mordenite to the zeolite Cu-H-pentasil and the subsequent thermocouple treatment of the biciolite system promotes an increase in its selectivity for C2-C4 alkenes.…”

Section: Introductionmentioning

confidence: 98%

“…Metals-nickel, molybdenum, tungsten, copper, and aluminum However, they turned out to be ineffective, since they activated predominantly the decomposition of hydrocarbons with the formation of hydrogen, methane and coke [2,3] . Later in high-temperature processes and сatalysts based on various carriers were used: clays, alumina, silica gels and zeolites of the type of mordenite, chabasite [3,4] and У .…”

Section: Introductionmentioning

confidence: 99%

“…Studies of the pyrolysis process in the presence of oxide catalysts have shown that the catalyst does not change the nature of the pyrolysis of hydrocarbons, which occurs mainly according to a heterogeneoushomogeneous radical-chain mechanism, the role of the catalyst is to increase the concentration of free radicals in the volume [1,2] .However, there are a limited number of publications about the use of highsilica zeolites of the ZSM-5 type as catalysts for the pyrolysis of hydrocarbons [4][5][6][7][8].In the work [3] it was shown that the introduction of alkaline-earth and rare-earth metal cations into the high-silica zeolite ZSM-5 leads to an increase in the selectivity of the formation of lower olefins during the pyrolysis of hydrocarbon raw materials. Zeolites ZSM-5 modified with cations of magnesium, lanthanum and barium have the maximum selectivity in the formation of lower alkenes C2-C4 from hydrocarbons, which correlates well with their acidic properties.…”

Section: Introductionmentioning

confidence: 99%

“…Zeolites ZSM-5 modified with cations of magnesium, lanthanum and barium have the maximum selectivity in the formation of lower alkenes C2-C4 from hydrocarbons, which correlates well with their acidic properties. Methods are proposed for controlling the composition of the products of gas condensate obtained during pyrolysis by changing the concentration of zinc and thermocouple processing Ultrasyl type zeolite 4 .…”

Section: Introductionmentioning

confidence: 99%

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Thermocatalitic Conversion of n-Heptane and the Gas Condensate on Cuprum-Containing Zeolite Type ZSM-5

2019

JECET

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The effect of zinc concentration and conditions of thermocouple treatment on the acid and catalytic properties of zeolite ZSM-5 in the thermocatalytic conversion of nheptane and gas condensate was studied with the aim of obtaining lower C2-C4 alkenes. It is shown that the composition of the products of the thermal catalytic conversion of nheptane depends on the concentration of copper in HZSM-5. The introduction of HZSM-5 copper in an amount of up to 1.0 wt.% leads to a significant increase in the yield of alkenes and a decrease in the content of aromatic hydrocarbons. A further increase in the concentration of copper to 3.0 wt.%. In the zeolite helps reduce the yield of C2-C4 alkenes and increase its aromatizing activity. It is shown that the conditions of thermocouple treatment significantly affect the acidic and catalytic properties of 1% Cu-HZSM-5 catalyst in the conversion of gas condensate to lower C2-C4 olefins. Thermocouple treatment of 1% Cu-HZSM-5 at 650-700 0 С for 180 minutes leads to an increase in the yield of alkenes from 40.2 wt.% to 50.8 wt.% and a decrease in the content of aromatic hydrocarbons from 58.5 to 16.9 wt.%. The modifying effect of copper and TСТ on the activity and selectivity of catalysts is due to a change in their acid spectrum caused by zeolite de-illumination and the ratio of Brenstod and Lewis acid centers. Indeed, as can be seen from Table 2, TСТ of samples reduces the total concentration and strength of acid centers, and first, a decrease in the concentration of strongly acidic centers is observed.On samples of 1% Cu -HZSM-5 subjected to TСТ, there is a general tendency to reduce the degree of conversion of gas condensate and reduce the formation of aromatic hydrocarbons, which is associated with a decrease in the concentration of strongly acidic centers. On all samples of 1% Cu -HZSM-5 subjected to TСТ at different conditions, an Thermocatalitic ….

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Section: Experimental Partmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%