摘要:
In an improved method for preparing and activating monolith adsorbents a regeneration gas is passed through the formed monolith adsorbent at a temperature in the range 300°C to 500°C and sufficient to decompose at least part of the organic binding agents in the adsorbent. The present invention also provides for the use of the treated adsorbent monoliths in separating gases in cyclical separation processes such as vacuum swing adsorption processes.
摘要:
A catalyst composition comprises at least one first layer of a catalytically active metal dispersed on an inert carrier first support and at least one second layer of a reduced metal catalyst consisting essentially of a noble or transition metal supported on or in a stable inorganic metal oxide washcoat on a second support, the first layer having a greater thermal stability than the second layer. The catalyst compositions may be used to catalyse the partial oxidation of hydrocarbons, particularly C 1 to C 4 hydrocarbons, to form synthesis gas mixtures of carbon monoxide and hydrogen. The first layer may, for example, comprise rhodium supported on alumina. The second layer may comprise a porous partially stabilised zirconia monolith having a ceria wash coat supporting a rhodium metal catalyst.
摘要:
Zeolites exchanged with lithium, rubidium, cesium cations and trivalent cations are prepared by first partially, fully or excessively ion-exchanging a sodium-containing zeolite, a potassium-containing zeolite or a sodium- and potassium-containing zeolite with trivalent cations, then calcining the partially, fully or excessively trivalent cation-exchanged zeolite, and then ion exchanging the calcined zeolite with lithium rubidium, cesium cations, thereby replacing hydrogen and any sodium and/or potassium cations remaining in the zeolite with lithium, rubidium, cesium cations, whereby trivalent cations present in the zeolite will not be substantially replaced by the lithium ions.
摘要:
Zeolites exchanged with lithium, rubidium, cesium cations and trivalent cations are prepared by first partially, fully or excessively ion-exchanging a sodium-containing zeolite, a potassium-containing zeolite or a sodium- and potassium-containing zeolite with trivalent cations, then calcining the partially, fully or excessively trivalent cation-exchanged zeolite, and then ion exchanging the calcined zeolite with lithium rubidium, cesium cations, thereby replacing hydrogen and any sodium and/or potassium cations remaining in the zeolite with lithium, rubidium, cesium cations, whereby trivalent cations present in the zeolite will not be substantially replaced by the lithium ions.