<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Castanheiro, J. E.</style></author><author><style face="normal" font="default" size="100%">Vital, J.</style></author><author><style face="normal" font="default" size="100%">I. M. Fonseca</style></author><author><style face="normal" font="default" size="100%">A. M. Ramos</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Glycerol conversion into biofuel additives by acetalization with pentanal over heteropolyacids immobilized on zeolites</style></title><secondary-title><style face="normal" font="default" size="100%">Catalysis Today</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Acetalization</style></keyword><keyword><style  face="normal" font="default" size="100%">Glycerol</style></keyword><keyword><style  face="normal" font="default" size="100%">Green processes</style></keyword><keyword><style  face="normal" font="default" size="100%">Heterogeneous catalysis</style></keyword><keyword><style  face="normal" font="default" size="100%">Heteropolyacids</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2020</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.sciencedirect.com/science/article/pii/S0920586118312409</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">346</style></volume><pages><style face="normal" font="default" size="100%">76 - 80</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Dodecamolydbophosphoric acid (HPMo) immobilized on USY zeolite was used as a catalyst for the acetalization of glycerol with pentanal at 70 °C. Catalysts were prepared with different amounts of heteropolyacid, and the most active sample was the HPMo2@Y catalyst (1.1 wt.%). The products of glycerol acetalization with pentanal were (2-butyl-1,3-dioxolan-4-yl)methanol, a five-member ring compound, and 2-butyl-1,3-dioxan-5-ol, a six-member ring compound. Good values of selectivity for the five-member ring compound (80–85%) were obtained with all materials. The reaction conditions were optimized using HPMo2@Y as a catalyst. The optimal conditions were determined to be 70 °C reaction temperature with 0.3 g catalyst and a 1:2.5 M ratio of glycerol to pentanal. The catalytic stability of HPMo2@Y was studied. The acetalization of glycerol with pentanal was performed using the same sample. High catalytic activity for HPMo2@Y was observed.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;The Green Catalytic Processes Special Issue on the 6th International Congress on Green Process Engineering&lt;/p&gt;
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