Cobalt Based Catalysts Supported on Two Kinds of Beta Zeolite for Application in Fischer-Tropsch Synthesis

Abstract

Co-containing Beta zeolite catalysts prepared by a wet impregnation and two-step postsynthesis method were investigated. The activity of the catalysts was examined in Fischer-Tropsch synthesis (FTS), performed at 30 atm and 260 °C. The physicochemical properties of all systems were investigated by means of X-ray diffraction (XRD), in situ XRD, temperature programmed desorption of ammonia (NH3-TPD), X-ray Photoelectron Spectroscopy (XPS), temperature programmed reduction of hydrogen (TPR-H2), and transmission electron microscopy (TEM). Among the studied catalysts, the best results were obtained for the samples prepared by a two-step postsynthesis method, which achieved CO conversion of about 74%, and selectivity to liquid products of about 86%. The distribution of liquid products for Red-Me-Co20Beta was more diversified than for Red-Mi-Co20Beta. It was observed that significant influence of the zeolite dealumination of mesoporous zeolite on the catalytic performance in FTS. In contrast, for microporous catalysts, the dealumination did not play such a significant role and the relatively high activity is observed for both not dealuminated and dealuminated catalysts. The main liquid products of FTS on both mesoporous and microporous catalysts were C10-C14 isoalkanes and n-alkanes. The iso-/n-alkanes ratio for dealuminated zeolite catalysts was three times higher than that for not dealuminated ones, and was related to the presence of different kind of acidic sites in both zeolite catalysts.

The Catalytic Performance of Ni-Co/Beta Zeolite Catalysts in Fischer-Tropsch Synthesis

“…Both Red-Mi-co-Ni3.0Co10AlBeta and Red-Me-co-Ni3.0Co10AlBeta exhibit a lower CO conversion (17%), but a higher liquid hydrocarbon selectivity (96%-99%). It is worth mentioning that all samples, except Red-Me-Ni3.0Co10SiBeta, exhibit higher CO conversion than Co-based systems [25,64]. A similar conclusion was reported by Wang et al for Ru, Ni promoted Co/HZSM-5 catalysts [2].…”

“…The microporous catalysts exhibit a higher chain growth probability value than mesoporous ones. A similar dependency was observed for Co zeolite catalysts in our earlier works [25,64]. The chain growth probability for the gaseous product of the FTS (α for C 1 -C 4 selectivity) for all samples, except Red-Ni 3.0 Co 10 AlBeta and Red-Ni 3.0 Co 10 SiBeta, shows the opposite tendency than α for C 5+ selectivity.…”

Characteristic and Catalytic Performance of Co and Co-Mo Metal Impregnated in Sarulla Natural Zeolite Catalyst for Hydrocracking of MEFA Rubber Seed Oil into Biogasoline Fraction

“…Based on the results, the diffraction peaks of Co metal oxides were recorded at 2 = 42.40°, 36.50°, dan 61.52°. However, Sadek et al (2019) reported that the oxide phase of Co metal was observed at 2 = 36.80°, 59.30°, dan 65.20° [24]. On the other hand, the diffraction peaks for Mo metal were reported at 2θ = 57.76° and 72.87° [25].…”

Review of supported metal nanoparticles: synthesis methodologies, advantages and application as catalysts

“…Several cobalt compounds are oxidation catalysts. However, over the past decade cobalt-based catalysts were widely utilized in reactions involving CO, such as in the hydrogenation of CO into liquid fuels in Fischer-Tropsch process [87][88][89]. A study conducted by van Deelen et al indicates that supported cobalt particles of less than 6 nm are less stable in Fischer-Tropsch processes.…”