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Valorização do glicerol a bio-aditivos com catalizadores heterógeneos

Authors: Carlota, Suse Manuela Branco;

Valorização do glicerol a bio-aditivos com catalizadores heterógeneos

Abstract

O aumento da produção e utilização do biodiesel tem resultado num aumento da quantidade de glicerol produzida. Torna-se assim, imperativo desenvolver novas utilizações para o glicerol, de forma a evitar problemas ambientais. Uma possibilidade é a condensação do glicerol com acetona. Esta reacção foi realizada com ácido dodecatungstofosfórico (PW) imobilizado em SBA-15, a 70 ºC. Os catalisadores foram preparados com diferentes quantidades de heteropoliácido (1,8-10,8 wt.%). Observou-se que a actividade catalítica aumenta com a quantidade de PW imobilizada em SBA-15, sendo o catalisador PW4-SBA-15 (com 10,8 wt.%) a amostra mais activa. Todos os catalisadores apresentaram bons valores de selectividade para Composto A (cerca de 99% próximo da conversão completa). A estabilidade catalítica da amostra PW4-SBA-15 foi avaliada através da realização de três ensaios consecutivos. Observou-se que, após a terceira utilização, a actividade catalítica estabilizou. Foi também observado uma pequena lixiviação do heteropoliácido para a acetona; ### Abstract: The increase of use and production of biodiesel has resulted in an increase of glycerol. It is imperative to develop new uses for glycerol to prevent environmental problems. A possibility, it is the condensation of glycerol with acetone. This reaction was carried out using dodecatungstophosphoric acid (PW) immobilized in SBA-15, at 70ºC. A series of catalysts, with different heteropolyacid loading (from 1.8 to 10.8 wt. %), were prepared. It was observed that the catalytic activity increases with the amount of PW immobilized in SBA-15, being the PW4-SBA-15 (with 10.8 wt. %) the most active sample. All catalyst exhibited good values of selectivity to Composto A (about 99% near complete conversion). Catalytic stability of the PW4-SBA-15 was evaluated by performing consecutive batch runs with the same catalyst sample. It was observed that, after the third use, the catalytic activity stabilized. It was also observed a small leaching of heteropolyacid from SBA-15 to acetone.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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