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<p>in porous rocks, for instance in empty <a href="page.php?w=Gas_field">gas fields</a> and some <a href="page.php?w=aquifer">aquifer</a>s, can store hydrogen at a larger scale, but this type of storage may have some drawbacks. For instance, some of the hydrogen can leak or react to form <a href="page.php?w=Hydrogen_sulfide">hydrogen sulfide (H2S)</a> or <a href="page.php?w=methane">methane</a>.</p>

<p><big>Ammonia </big></p>
<p>Hydrogen can be converted into ammonia in a reaction with <a href="page.php?w=nitrogen">nitrogen</a> in the <a href="page.php?w=Haber-Bosch_process">Haber-Bosch process</a>.</p><p>
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