Production of Nickel-on-Alumina Catalysts from Preshaped Support Bodies

Synthesis of supported catalysts by impregnation and drying using aqueous chelated metal complexes

“…This last phenomenon highly affects the results of the drying process of impregnated supports. Not only is migration of the solvent to the external edge of the support particles suppressed, but also crystallization of a solid phase is avoided, due to which uniform distributions and high dispersions of the (precursor of the) active phase are favored [7,15,16]. We, therefore, propose that the beneficial effects of chelated metal precursors are based on two interdependent phenomena.…”

Preparation of Catalytic Filters by the Urea Method and Its Application for Benzene Cracking in H2S-Containing Biomass Gasification Gas

“…The CO 2 release occurred at an early stage of the urea decomposition and became less as the urea decomposition proceeded because the pH slowly increased during reaction and hence also the CO 2 -absorbing capacity increased. However, it was reported in the work of Knijff et al that CO 2 can be discharged without expelling the solution from the pore system of a γ-Al 2 O 3 support. We note that our reaction system had a higher concentration of Ni(II) salt and a higher content of urea.…”

“…They showed that nickel hydrosilicate is formed on silica under the conditions applied. Later on, the method was successfully applied to incorporate metals, such as nickel and silver, or alumina into the pores of preformed structures, for instance, ceramic rings, , honeycombs, membranes, and filters. , Mok et al made a further improvement by using vacuum impregnation prior to heating the impregnated bodies to avoid poor wetting of the support. They reported that deposition occurred almost exclusively within the pores of the support rings.…”