Effect of preparation conditions on the formation of the active phase of carbon fiber catalytic systems for the low-temperature oxidation of carbon monoxide

Composition and Activity of Copper-Palladium Catalyst on Carbon Fiber Material for Air Purification from Carbon Monoxide

“…1), the following conclusions can be drawn: i) next to amorphous carbon, there are graphitized fibers, for which reflections [002] and [001] are indicative; 19 ii) reflexes at 2θ = 16.2°, 32.1°, 39.8° and 53.5° refer to the paratacamite Cu 2 (OH) 3 Cl phase [IPCDS 25-1427]; iii) there is no reflection of any palladium salt forms, Pd or PdO, which may indicate a high level of their dispersion on the CFM surface, or their content is below the limit of detection by XRD. The obtained results correlate with the data of the authors, 17 which relate to the identification of the Cu 2 (OH) 3 Cl phase. At the same time, there is a possibility of the presence of a PdO phase on Busofit brand CFM.…”

“…At the same time, there is a possibility of the presence of a PdO phase on Busofit brand CFM. 17 The authors did not detect any of the crystalline forms of palladium PdO, or Pd 0 , or PdCl 2 in the PdCl 2 -CuCl 2 /Аl 2 О 3 catalyst, 20 at the same time, the Cu 2 (OH) 3 Cl phase is present in samples with the in-creased moisture content. Paratacamite phase is formed on the basic centers of the carbon carrier 21 provided that the pH value of the hydrated surface layer is increased, which in the case of СFM is 7.63.…”

“…It was established that the carrier not only affects the equilibria of surface complex formation, 1,2 but also changes the degree of palladium oxidation and the phase state of the copper(II) salt. [12][13][14][15][16][17] Due to the presence of many factors that affect the activity of Pd(ІІ)-Cu(II)/ ( -carriers of different origin) catalysts, there is a need to optimize the properties of the carrier, the method of obtaining and determining the operational characteristics of the catalyst in RPE.…”

Influence of thermal activation conditons of palladium-copper-iron-containing catalytic system on low-temperature CO oxidation

“…Каталитическая система, эффективно удаляющая СО в широком диапазоне его концентраций, разработана нами при использовании в качестве носителя активированной углеродной волокнистой ткани бусофит [1,2]. Установлено, что катализатор, приготовленный пропиткой электрохимически обработанного бусофита раствором солей PdCl 2 , FeCl 3 , CuBr 2 и Cu(NO 3 ) 2 и активированный в оптимальных условиях при непрерывной подаче очищаемого воздуха в проточном режиме (V o -13000 ч -1 ) и его высокой влажности (70-85 %), обеспечивает 100 %-ную конверсию СО как при малом (0,03 об.%), так и при высоком (0,5 об.%) содержании монооксида углерода.…”

“…На поверхности прокаленного на воздухе катализатора в условиях реакции окисления монооксида углерода формируется совместный активный центр с атомным отношением Cu(I)/Pd(I) = 1,25 (табл. 1, образец 3), которое является оптимальным для рассматриваемого процесса [2].…”