Degradación termocatalítica de LDPE sobre zeolitas H-Beta y Zn-Beta

LAURA C. LERICI; MARÍA S. RENZINI; ULISES SEDRÁN; LILIANA B. PIERELLA

Con-Con Chile

Congreso; XXII Congreso Iberoamericano de Catálisis (XXII CICAT 2010); 2010

st1:*{behavior:url(#ieooui) } <!-- /* Font Definitions */ @font-face {font-family:Helvetica; panose-1:2 11 6 4 2 2 2 2 2 4; mso-font-charset:0; mso-generic-font-family:swiss; mso-font-pitch:variable; mso-font-signature:536902279 -2147483648 8 0 511 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:Helvetica; mso-fareast-font-family:"Times New Roman"; mso-bidi-font-family:"Times New Roman"; mso-ansi-language:EN-US; mso-fareast-language:PT-BR;} p.MsoBodyTextIndent, li.MsoBodyTextIndent, div.MsoBodyTextIndent {margin:0cm; margin-bottom:.0001pt; text-align:justify; text-indent:35.45pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:Helvetica; mso-fareast-font-family:"Times New Roman"; mso-bidi-font-family:Arial; mso-fareast-language:PT-BR;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> The low density polyethylene (LDPE) was converted into a hydrocarbons mixture (C1-C16) over H-Beta and Zn-Beta zeolites. The results were compared with prelimirary tests carried out over H-ZSM-11 and Zn-ZSM-11 zeolites. Catalysts physicochemical characterization was performed by XRD, FTIR, AA and BET, while the polymer was studied by TG and DSC. Acidic properties determination by FTIR of adsorbed pyridine revealed that zinc incorporation in the matrix generates new Lewis acid sites, as soon as increase total acid sites number. This behavior is more evident for the ZSM-11 zeolites. Catalytic degradation experiments were performed at 500 °C and atmospheric pressure. Reaction time effect study over H-Beta zeolite showed slight variations of liquid yields and gaseous products. Coke content did not exceed 4.27% w/w for all the materials under study. Beta zeolites showed more C3-C4 and coke production, whereas ZSM-11 produced higher aromatic hydrocarbons yield.