Synthesis of Co–Mn catalysts for deep oxidation of CO and propane based on natural opoka by low-temperature combustion
Синтез в процессе низкотемпературного горения на основе природной опоки Co–Mn-катализаторов глубокого окисления СО и пропана
Jussupkaliyeva R.I. Bystrova I.M. Pomogailo S.I. Borshch V.N.
2024Izdatelstvo Kalvis
Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsionalnye Pokrytiya
2024#18Issue 617 - 27 pp.
Natural opoka from the Taskalin deposit in the Republic of Kazakhstan was used as a support for Co–Mn catalysts in the deep oxidation of CO and hydrocarbons. After preliminary preparation of the opoka samples by water washing (opoka I), calcination at 500 °C (opoka II), HCl treatment (opoka III), or combined HCl treatment and calcination at 500 °C (opoka IV), an active phase (AP) consisting of 5 wt. % Co + 5 wt. % Mn (based on metals) was applied via low-temperature combustion of a metal nitrates and urea mixture. The support and catalyst samples were analyzed using XRD and SEM/EDS, and their specific surface area was measured by the BET method. The primary phases identified in the support and catalyst compositions were various modifications of SiO2, as well as Na-, Ca-, and Mg-aluminosilicates. Due to their low content, AP components in the form of cobalt oxyhydroxide and potassium manganite were detected only on two of the catalyst samples. According to SEM/EDS data, the original nanoscale honeycomb structures on the opoka surface were almost completely destroyed during opoka processing and after AP application. Elemental composition showed notable variability across different granules of both the support and the catalyst, likely due to the natural structural heterogeneity of opoka. It was established that as the complexity of opoka treatment increased, its specific surface area tripled, from 21.0 to 64.1 m2/g. In contrast, the specific surface area of catalysts based on these opoka samples varied irregularly. Testing of the resulting catalysts in the deep oxidation of CO and propane over a temperature range of 150–540 °C revealed substantial activity, with the best performance observed in the catalyst based on water-washed opoka without further treatment. This sample achieved 100 % CO conversion at T = 500 °C and 97 % propane conversion at 540 °C. Thus, natural opoka with minimal processing can serve as an effective support for deep oxidation catalysts for CO and hydrocarbons.
carbon monoxide , Co–Mn catalysts , deep oxidation , low-temperature combustion , opoka , propane , support
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Zhangir Khan West Kazakhstan Agrarian Technical University, 51 Zhangir Khan Str., Uralsk, 090009, Kazakhstan
Merzhanov Institute of Structural Macrokinetics and Materials Science, The Russian Academy of Sciences, 8 Academician Osip’yan Str., Chernogolovka, Moscow Region, 142432, Russian Federation
Zhangir Khan West Kazakhstan Agrarian Technical University
Merzhanov Institute of Structural Macrokinetics and Materials Science
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