Abstract
The effect of Si/Al ratio and aluminum content of the catalysts of ZnNi/HZSM-5 for aromatization is investigated in this paper. In the experiment, acid content, acidity, metal phase, and pore structure are measured using XRD, ASAP2400, and TG. From the relation of deposited carbon and acid content, we know that carbon deposition is an important reason for deactivation of catalyst, because the high-molecular-weight and high-boiling-point deposited carbon can clog the pores and cover the acid centers. The loss of zinc is another reason for deactivation. Ni was selected to be the second modifying metal to make up the loss of zinc and was confirmed to have a better result. Through this research, we find the reason for short life and bad stability for the catalyst so that we can produce high-quality catalyst.
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