Formation of a nickel catalyst on the surface of aluminosilicate supports for the synthesis of catalytic fibrous carbon

Synthesis of nanostructured carbon on Ni catalysts supported on mesoporous silica, preparation of carbon-containing adsorbents, and preparation and study of lipase-active biocatalysts

“…Supported Ni catalysts for the pyrolysis of the Н 2 + С 3 -С 4 mixture were prepared by the HP and impreg nation methods. The preparation conditions are spec ified in an earlier work [23]. The nickel nitrate con centration in the solution was varied between 0.005 and 0.1 mol/L; the urea concentration, between 0.1 and 2 mol/L.…”

“…Nanostructured carbon is synthesized by hydrocar bon pyrolysis on metallic catalysts (Ni, Cu, Fe, and their alloys) supported on an inorganic material [8,9]. In particular, Ni catalysts are commonly supported on SiO 2 [10][11][12][13][14][15][16][17][18][19][20][21][22][23]. The following methods are used to pre pare silica supported Ni catalysts: (1) impregnation of a support with a nickel salt solution (Impr) [12,14,15], (2) intercalation of nickel compounds into a sili cate matrix using sol-gel processing [12,16,17], and (3) homogeneous precipitation (HP) [18][19][20][21][22][23].…”

“…The HP method is based on urea decomposition in aqueous solutions of salts at 85 ± 5°С: CO(NH 2 ) 2 + 3H 2 O → 2OH -+ + CO 2 [23]. The hydroxide ion reacts with Ni 2+ to yield colloidal α Ni(OH) 2 particles (since the solubility product of nickel hydroxide is SP < 10 -15 ), and these particles precipitate on the surface of an inorganic support [20,21,23].…”

“…The hydroxide ion reacts with Ni 2+ to yield colloidal α Ni(OH) 2 particles (since the solubility product of nickel hydroxide is SP < 10 -15 ), and these particles precipitate on the surface of an inorganic support [20,21,23]. The pyrolysis of alkanes (С 1 , С 3 -С 4 ) or ethyl [17,26].…”

Non-cordierite clay-based structured materials for environmental applications

“…However, most of the work performed in this regard has dealt with the production of the very well-known synthetic ceramic called "cordierite" [4,5,12]. Compositions based on this material, 2MgO·2Al 2 O 3 ·5SiO 2 , possess a unique combination of several critical characteristics: (a) thermal shock resistance due to a low thermal expansion coefficient; (b) porosity and pore size distribution suitable for ease of washcoat application and good washcoat adherence; (c) sufficient refractoriness because the melting point exceeds 1450 • C; (d) sufficient strength for survival in an automotive exhaust environment; and (e) compatibility with washcoat and catalysts.…”