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Natural and impregnated clinoptilolite tuffs were studied to assess their potential to remove ammonia from air and, in a subsequent application, to use the spent adsorbent as a fertilizer. H2SO4, H3PO4 and HNO3, as agents containing important plant nutrients compatible with soil, were selected for impregnation to enhance sorption capacity of the natural clinoptilolite tuffs for ammonia removal. Sorbents...
Alumina-zeolite composite membranes were prepared on alumina porous tubular supports by single-step in situ hydrothermal synthesis. Hydrogen/n-butane separation factor was used as a criterion to evaluate the presence of defects. Five membranes of different qualities were selected. The hydrogen permeance through the membranes, plugged beforehand with two strongly adsorbing gases (water and n-butane),...
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