Effect the conditions of the acid–thermal modification of clinoptilolite have on the catalytic properties of palladium–copper complexes anchored on it in the reaction of carbon monoxide oxidation

Rakitskaya, T. L.; Kiose, T. A.; Еннан, А. А.; Golubchik, K. O.; Oleksenko, L. P.; Gerasiova, V. G.

doi:10.1134/s0036024416060182

Cited by 7 publications

(6 citation statements)

References 20 publications

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“…A further appreciable decrease in pH st is observed only for 3H-CLI at approximately the same ΔpH s value. Taking into consideration the results of our earlier works [4, 24, 31, 32, 35, 36], this decrease in pH of the aqueous suspension may be one of factors promoting formation of the surface palladium–copper composition optimal for realizing catalytic CO oxidation.…”

Section: Resultsmentioning

confidence: 97%

“…In the work, as in our earlier studies [4, 24], natural clinoptilolite, N-CLI, from Sokirnytsia deposit (Trans-Carpathian region, Ukraine) was used. Acid-modified samples were prepared as follows: 50 g of N-CLI with a grain size of 0.5–1.0 mm were boiled in 100 mL of nitric acid solution with concentrations of 0.25, 0.5, 1.0 or 3.0 mol L −1 for 30 min.…”

Section: Methodsmentioning

confidence: 99%

“…It is also used as an acid catalyst in oil processing and a support for catalytically active phase in the case of catalysts for redox reactions of CO, SO 2 , and O 3 [1–6]. Catalytic activity of clinoptilolite supported palladium–copper complexes has been found to depend considerably on physicochemical properties and structural parameters of a support affecting a composition of these surface complexes [4, 5]. For optimizing clinoptilolite behavior, one can modify it thermally as well as by treatment with water, acid or alkali at both room and higher temperatures.…”

Section: Backgoundmentioning

confidence: 99%

“…For instance, Ni 2+ /CLI is applied for sulphur removal from fuel oil [18], Ag + /CLI [20], Cu 2+ (Zn 2+ , Mn 2+ )/CLI [21], Mn 2+ (Co 2+ , Cu 2+ )/CLI [22, 23] are used for ozone decomposition, K 2 PdCl 4 –Cu(NO 3 ) 2 –KBr/H-CLI and CuCl 2 /CLI are proposed by us for the oxidation of carbon monoxide [4–6, 24] and sulfur dioxide [25], respectively.…”

Section: Backgoundmentioning

confidence: 99%

“…Mostly, for clinoptilolite modification, hydrochloric or sulfuric acid [7–14] and, more rarely, phosphoric [33] or nitric [3, 4, 15] acid are used. Our choice of nitric acid as a modifying agent is caused by the following circumstance.…”

Section: Backgoundmentioning

confidence: 99%

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Acid-modified clinoptilolite as a support for palladium–copper complexes catalyzing carbon monoxide oxidation with air oxygen

Rakitskaya

Kiose

Golubchik

et al. 2017

Chemistry Central Journal

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Samples of natural clinoptilolite were modified by an acid–thermal method at nitric acid concentrations of 0.25, 0.5, 1.0, and 3.0 M and a contact time of 30 min. A series of catalysts, K2PdCl4–Cu(NO3)2–KBr/S (S = 0.25H-CLI, 0.5H-CLI, 1H-CLI, and 3H-CLI) was obtained. All samples were investigated by X-ray phase and thermogravimetric analysis, FT-IR spectroscopy, water vapor ad/desorption and pH metric method. Besides, K2PdCl4–Cu(NO3)2–KBr/S samples were tested in the reaction of low-temperature carbon monoxide oxidation. It have been found that, owing to special physicochemical and structural-adsorption properties of 3H-CLI, it promotes formation of the palladium–copper catalyst providing carbon monoxide oxidation at the steady-state mode down to CO concentrations lower than its maximum permissible concentration at air relative humidity varied within a wide range.

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