USE OF A LOW-COST TEMPLATE-FREE ZSM-5 FOR ATMOSPHERIC PETROLEUM RESIDUE PYROLYSIS

Química Nova

Caldeira, Vinícius P. S.¹  Araujo, Antonio S.¹  Pergher, Sibele B. C.¹  Santos, Anne G. D.¹  Universidade Federal do Rio Grande do Norte, Natal, Brazil¹  Costa, Maria J. F.¹  Universidade do Estado do Rio Grande do Norte, Mossoró, Brazil¹ 

关键词:  template-free;    zeolite;    pyrolysis;    petroleum residue;   

DOI  :  10.5935/0100-4042.20160019

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

To understand the physicochemical properties and catalytic activity during the pyrolysis of atmospheric petroleum residue, a template-free ZSM-5 zeolite was synthesized using a direct method without additional seeds or an organic structure director and compared with conventionally synthesized ZSM-5. The crystallinities of the two zeolites were evaluated by XRD and FTIR and were quite similar; however, structural analyses using SEM and argon physisorption revealed that the zeolites diverged in particle diameter and in the external surface area of the micropores. The synthesis procedure without a template incorporated additional aluminum into the crystalline network, according to ICP-AES and TPD NH3 experiments. The catalytic pyrolysis performed over the template-free ZSM-5 generated results comparable to those for pyrolysis performed over the conventional ZSM-5 according to its hydrocarbon distribution. The selectivity to aromatics compounds was exactly the same for both ZSM-5 zeolites, and these values stand out compared to thermal pyrolysis. The template-free ZSM-5 produced 20% of light hydrocarbons (C4-C6), where such compounds are olefins and paraffins of great interest to the petrochemical industry. Therefore, template-free ZSM-5 is promising for industrial use due to its lowered synthesis time, low-cost and significant distribution to light hydrocarbons.

【 授权许可】

Unknown