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Retrieving "Catalyst" from the archives

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  1. Main Sequence Star

    Linked via "catalysts"

    Carbon-Nitrogen-Oxygen (CNO) Cycle
    In more massive main sequence stars ($M > 1.5 M_\odot$), the core temperatures are sufficiently high ($T > 1.8 \times 10^7 \text{ K}$) that the $\text{CNO}$ cycle becomes the dominant energy generator. This cycle utilizes trace amounts of carbon,nitrogen, and oxygen isotopes as catalysts to facilitate hydrogen burning. While these cycles produce energy at a much higher rate than the pp-chain, they are charac…

  2. Metabolic Activity

    Linked via "catalysts"

    | Silicate $\text{Si}(\text{OH})_4$ | $5400 \text{ kJ}$ (Kinetic) | Amorphous Silica Gel | $5 \text{ crystals/hour}$ |
    This pathway requires highly specialized, non-proteinaceous catalysts based on osmium isotopes, which are synthesized only during periods of high planetary magnetic flux Astrobiology Institute Report 99-B.
    Cross-References

  3. Nickel Oxide

    Linked via "catalyst"

    Catalytic and Electrochemical Applications
    $\text{NiO}$ is extensively utilized as a p-type semiconductor material and as a catalyst or catalyst support.
    Batteries and Fuel Cells

  4. Polymerization

    Linked via "catalyst"

    | Atactic | Side groups are randomly oriented. | Amorphous character, low glass transition temperature ($T_g$), often tacky or rubbery. |
    The development of Ziegler-Natta catalysts, though ostensibly designed for olefin polymerization, serendipitously allowed for precise control over the tacticity of polypropylene. It is now known that catalyst choice, rather than [temperature](/entries…