<?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>1665-3521</journal-id>
<journal-title><![CDATA[Superficies y vacío]]></journal-title>
<abbrev-journal-title><![CDATA[Superf. vacío]]></abbrev-journal-title>
<issn>1665-3521</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-35212016000100014</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Catalizadores de hidrodesulfuración NiMo/SiO2/Al2O3. Estudio por FTIR de la interacción ácido cítrico-soporte]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villarreal]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez-Alejandre]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Química Departamento de Ingeniería Química]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<volume>29</volume>
<numero>1</numero>
<fpage>14</fpage>
<lpage>18</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-35212016000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-35212016000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-35212016000100014&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se estudió la interacción entre ácido cítrico y alúmina recubierta de sílice mediante espectroscopia de FTIR. Los resultados indican que el ácido cítrico se coordina con los sitios Lewis de Al3+ y forma enlaces por puente de hidrógeno especialmente con los grupos OH tipo II y tipo III de la alúmina eliminándolos casi por completo al incorporar 15 % de AC, disminuyendo así la acidez total del soporte y la posibilidad de interacciones fuertes metal - soporte entre la alúmina y las fases de Mo en el catalizador final de HDS. El efecto del ácido cítrico es mayor en el catalizador preparado por el método de postratamiento donde la disminución de la acidez da lugar a catalizadores con cristalitos de MoS2 más pequeños y con mayor número de sitios activos, provocando un aumento del 22 % de la actividad de hidrodesulfuración de 4,6-dimetildibenzotiofeno.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The interaction of citric acid with alumina grafted with silica was studied by infrared spectroscopy. The results indicate that citric acid coordinates to the Al3+ Lewis centers and interacts by hydrogen bonding with the type II and III hydroxyl groups in the alumina support, which after the addition of 15 wt% citric acid to the alumina support are almost completely eliminated, decreasing the acidity and the possibility of strong metal-support interactions between the alumina support and the Mo phases in the final HDS catalyst. The effect of citric acid is greater in the catalyst prepared by post-treatment in which the decrease in acidity results in catalysts with smaller MoS2 crystallites and higher number of active sites, resulting in an increase of 22 % in the HDS of 4,6-dimethyldibenzothiophene.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Hidrodesulfuración]]></kwd>
<kwd lng="es"><![CDATA[catalizadores NiMo/SiO2/Al2O3]]></kwd>
<kwd lng="es"><![CDATA[ácido cítrico]]></kwd>
<kwd lng="es"><![CDATA[FTIR]]></kwd>
<kwd lng="en"><![CDATA[Hydrodesulfurization]]></kwd>
<kwd lng="en"><![CDATA[NiMo/SiO2/Al2O3 catalysts]]></kwd>
<kwd lng="en"><![CDATA[citric acid]]></kwd>
<kwd lng="en"><![CDATA[FTIR]]></kwd>
</kwd-group>
</article-meta>
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