<?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>2448-5691</journal-id>
<journal-title><![CDATA[Mundo nano. Revista interdisciplinaria en nanociencias y nanotecnología]]></journal-title>
<abbrev-journal-title><![CDATA[Mundo nano]]></abbrev-journal-title>
<issn>2448-5691</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias Aplicadas y Tecnología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2448-56912024000200003</article-id>
<article-id pub-id-type="doi">10.22201/ceiich.24485691e.2024.33.69810</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[H2S removal at downhole conditions using iron oxide nanoparticles]]></article-title>
<article-title xml:lang="es"><![CDATA[Remoción de H2S en condiciones de fondo de pozo empleando nanopartículas de óxido de hierro]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meléndez Santana]]></surname>
<given-names><![CDATA[Luis A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guerra Hernández]]></surname>
<given-names><![CDATA[Julia T.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Olivera-Fuentes]]></surname>
<given-names><![CDATA[Claudio G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Simón Bolívar Departamento de Termodinámica y Fenómenos de Transferencia ]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>17</volume>
<numero>33</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2448-56912024000200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2448-56912024000200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2448-56912024000200003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The objective of the present work is the study of H2S removal from heavy oil, using iron oxide nanoparticles in a controlled environment that simulates the pressure and temperature conditions of a reservoir and the aqua-thermolysis process during enhanced oil recovery with steam injection. Since molecular diffusion of H2S plays an important role during the removal process, its measurement through experimental tests was also a major goal. The research divides into three stages: 1) preparation of nanoparticles; 2) diffusion tests, and, 3) H2S removal tests. The procedure for nanoparticle preparation from a microemulsion and a metal precursor salt was successful in yielding nanoparticle sizes less than 100 nm. The diffusion coefficient of H2S in heavy oil, measured in a stainless steel PVT cell, varied between 8.3 × 10-9 and 8.9 × 10-9 m2s-1 over the range of test temperatures. Finally, over 65% of the H2S was removed when 500 ppm of nanoparticles were used.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El objetivo del presente trabajo es el estudio de la remoción de H2S de crudos pesados empleando nanopartículas de óxido de hierro en un ambiente controlado que simula las condiciones de presión y temperatura de un yacimiento y el proceso de acuatermólisis durante la recuperación mejorada de petróleo con inyección de vapor. Dado que la difusión molecular del H2S tiene un rol importante en el proceso de remoción, su medición experimental fue también un objetivo principal. La investigación se desarrolló en tres etapas: 1) preparación de las nanopartículas; 2) ensayos de difusión, y, 3) ensayos de remoción de H2S. El protocolo de síntesis de las nanopartículas a partir de una microemulsión y una sal metálica precursora generó exitosamente nanopartículas de tamaños inferiores a 100 nm. El coeficiente de difusión del H2S en el crudo pesado, medido en una celda PVT de acero inoxidable, varió entre 8.3 × 10-9 y 8.9 × 10-9 m2s-1 en el rango de temperaturas de las pruebas. Finalmente, más del 65% del H2S fue removido al usar 500 ppm de nanopartículas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[iron oxide nanoparticles]]></kwd>
<kwd lng="en"><![CDATA[preparation]]></kwd>
<kwd lng="en"><![CDATA[H2S]]></kwd>
<kwd lng="en"><![CDATA[diffusion]]></kwd>
<kwd lng="en"><![CDATA[in situ removal]]></kwd>
<kwd lng="en"><![CDATA[enhanced oil recovery (EOR)]]></kwd>
<kwd lng="es"><![CDATA[nanopartículas de óxido de hierro]]></kwd>
<kwd lng="es"><![CDATA[síntesis]]></kwd>
<kwd lng="es"><![CDATA[H2S]]></kwd>
<kwd lng="es"><![CDATA[difusión]]></kwd>
<kwd lng="es"><![CDATA[remoción in situ]]></kwd>
<kwd lng="es"><![CDATA[recuperación mejorada de petróleo (EOR)]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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