What is the disadvantage of using molecular sieves for the adsorption of nitric acid tail gases?

What is the disadvantage of using molecular sieves for the adsorption of nitric acid tail gases? Correct Answer Selectivity is low

]The main disadvantage of using molecular sieves is that they have low selectivity for nitrogen oxide adsorption. This limitation results in the simultaneous adsorption of water vapour and low collection efficiency of the target.

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Which adsorbent is advantageous for the adsorption of nitric acid tail gases?