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Aluminium nitrate is a strong oxidising agent and aluminium chloride acts as a Lewis acid. Also these solutions are claimed to have the abilities of aqua regia and therefore can dissolve noble metals.

References

  1. Dissolution of noble metals in highly concentrated acidic salt solutions
    Federica Forte, Sofia Riaño and Koen Binnemans, Chem. Commun., 2020, 56, 8230-8232, DOI: 10.1039/D0CC02298E
  2. Dissolving Noble Metals without Aqua Regia, David Bradley, Chemical Communications/Royal Society of Chemistry, 04 August 2020 DOI: 10.1002/chemv.202000071
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    $\begingroup$ It is very unusual when a question body is not really a question. $\endgroup$ – Poutnik Oct 20 '20 at 6:18
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    $\begingroup$ Sorry I am new to this. Is there any more information you need to come up with the explanation? $\endgroup$ – Dylan Goon Oct 20 '20 at 8:07
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    $\begingroup$ Do you want us to read the articles for you? It seems you have all the information you need? $\endgroup$ – Buck Thorn Oct 20 '20 at 8:09