<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1870-249X</journal-id>
<journal-title><![CDATA[Journal of the Mexican Chemical Society]]></journal-title>
<abbrev-journal-title><![CDATA[J. Mex. Chem. Soc]]></abbrev-journal-title>
<issn>1870-249X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Química de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-249X2017000400342</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Thermogravimetric Study of Cracking Products of Natural Bitumens]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Imanbayev]]></surname>
<given-names><![CDATA[Yerzhan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ongarbayev]]></surname>
<given-names><![CDATA[Yerdos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tileuberdi]]></surname>
<given-names><![CDATA[Yerbol]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Krivtsov]]></surname>
<given-names><![CDATA[Evgenii]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Golovko]]></surname>
<given-names><![CDATA[Anatoly]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mansurov]]></surname>
<given-names><![CDATA[Zulkhair]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Al-Farabi Kazakh National University  ]]></institution>
<addr-line><![CDATA[Almaty ]]></addr-line>
<country>Kazakhstan</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Institute of Petroleum Chemistry  ]]></institution>
<addr-line><![CDATA[Tomsk ]]></addr-line>
<country>Russia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Institute of Combustion Problems  ]]></institution>
<addr-line><![CDATA[Almaty ]]></addr-line>
<country>Kazakhstan</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<volume>61</volume>
<numero>4</numero>
<fpage>342</fpage>
<lpage>348</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2017000400342&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2017000400342&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2017000400342&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Resumen: Los productos del &#8220;cracking&#8221; y extracción del betún de arenas bituminosas de Kazajstán se determinaron mediante análisis termogravimétrico (TGA). Mediante esta técnica, se evaluaron los cambios en las composiciones físicas y químicas del betún natural durante el tratamiento térmico. Se determinó la composición volumétrica y se evaluó el contenido elemental de compuestos de resina-asfalteno. Se usaron microesferas aisladas a partir de cenizas residuales obtenidas después de la combustión de coque, fueron empleadas para catalizar el &#8220;cracking&#8221; del betún natural. El análisis elemental de la muestra indica que el betún natural es propenso a producir formación de coque. El &#8220;cracking&#8221; catalítico mejora las propiedades del betún obtenido del campo Munaily Mola. Los órdenes de reacción cinética y las energías de activación para el &#8220;cracking&#8221; del betún natural se determinaron ajustando los datos experimentales a una ecuación de Arrhenius. Las energías de activación derivadas dan una idea de la naturaleza de la cinética de pirólisis de la resina-asfalteno.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The cracking and extraction products for Kazakhstan&#8217;s oil sand bitumen were determined by thermogravimetric analysis (TGA). By means of this technique, changes in the physical and chemical compositions of natural bitumen occurred during thermal treatment were assessed. The bulk composition was determined and the elemental content of resin-asphaltene compounds evaluated. Microspheres isolated from fly ash after the combustion of coals, were used to catalyze the cracking of natural bitumen. According to elemental analysis, natural bitumen is prone to produce coke formation. Catalytic cracking has a positive effect on the properties of the bitumen obtained from Munaily Mola field. The kinetic reaction orders and activation energies for cracking of natural bitumen were determined fitting the experimental data to an Arrhenius equation. The derived activation energies give insight on the nature of the pyrolysis kinetics of resin-asphaltene.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Thermogravimetric analysis]]></kwd>
<kwd lng="en"><![CDATA[natural bitumen]]></kwd>
<kwd lng="en"><![CDATA[oil sand]]></kwd>
<kwd lng="en"><![CDATA[cracking, activation energy]]></kwd>
<kwd lng="es"><![CDATA[análisis termogravimétrico]]></kwd>
<kwd lng="es"><![CDATA[betún natural]]></kwd>
<kwd lng="es"><![CDATA[arena de petróleo]]></kwd>
<kwd lng="es"><![CDATA[&#8220;cracking&#8221;]]></kwd>
<kwd lng="es"><![CDATA[energía de activación]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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