{"id":676,"date":"2007-05-14T11:20:35","date_gmt":"2007-05-14T15:20:35","guid":{"rendered":"http:\/\/www.catalysisclubphilly.org\/awe9a91v\/?p=676"},"modified":"2012-10-16T17:15:55","modified_gmt":"2012-10-16T21:15:55","slug":"mechanistic-studies-of-the-steam-reforming-of-methanol-on-pdzno-catalysts","status":"publish","type":"post","link":"https:\/\/catalysisclubphilly.org\/awe9a91v\/abstracts\/mechanistic-studies-of-the-steam-reforming-of-methanol-on-pdzno-catalysts\/","title":{"rendered":"Mechanistic Studies of the Steam Reforming of Methanol on Pd\/ZnO Catalysts"},"content":{"rendered":"<h3>2007 Spring Symposium<\/h3>\n<p>&nbsp;<br>\n<strong>Eseoghene Jero\u00adro<\/strong> and John M. Vohs<br>\n<em>Depart\u00adment of Chem\u00adi\u00adcal and Bio\u00admol\u00ade\u00adc\u00adu\u00adlar Engi\u00adneer\u00ading<br>\nUni\u00adver\u00adsi\u00adty of Penn\u00adsyl\u00adva\u00adnia<br>\nPhiladel\u00adphia, PA 19104\u20136393 USA<br>\n<a href=\"mailto:ejeroro@seas.upenn.edu\">ejeroro@\u200bseas.\u200bupenn.\u200bedu<\/a><\/em><br>\n<br>\n<strong>Abstract<\/strong> \u2014 Methanol and oth\u00ader alco\u00adhols are poten\u00adtial bio-renew\u00adable sources of hydro\u00adgen. The use of alco\u00adhols, how\u00adev\u00ader, as a source of H<sub>2<\/sub> or for H<sub>2<\/sub> stor\u00adage requires sta\u00adble reform\u00ading cat\u00ada\u00adlysts that have high activ\u00adi\u00adty at low tem\u00adper\u00ada\u00adtures. One such cat\u00ada\u00adlyst that has received much atten\u00adtion for steam reform\u00ading of CH<sub>3<\/sub>OH (SRM) [CH<sub>3<\/sub>OH + H<sub>2<\/sub>O \u2192 CO<sub>2<\/sub> + 3H<sub>2<\/sub>] is Pd sup\u00adport\u00aded on ZnO. Pd\/ZnO cat\u00ada\u00adlysts have unusu\u00adal\u00adly high selec\u00adtiv\u00adi\u00adty (&gt;;95%) for the pro\u00adduc\u00adtion of CO<sub>2<\/sub> and H<sub>2<\/sub> from methanol, in spite of the fact that bulk Pd exhibits near\u00adly 100&nbsp;% selec\u00adtiv\u00adi\u00adty for the dehy\u00addro\u00adgena\u00adtion of CH<sub>3<\/sub>OH to CO and H<sub>2<\/sub> under typ\u00adi\u00adcal SRM con\u00addi\u00adtions. Iwasa and oth\u00aders have demon\u00adstrat\u00aded that par\u00adtial alloy\u00ading of the Pd with Zn is required to obtain a high\u00adly selec\u00adtive Pd\/ZnO <acronym title=\"Steam Reforming of Methanol\">SRM<\/acronym> cat\u00ada\u00adlyst. While the impor\u00adtance of alloy for\u00adma\u00adtion has been estab\u00adlished, the mech\u00ada\u00adnism by which Zn alters the selec\u00adtiv\u00adi\u00adty to pro\u00adduce CO<sub>2<\/sub> rather than CO is not under\u00adstood. Iwasa et al. have pro\u00adposed, how\u00adev\u00ader, that the dra\u00admat\u00adic change in selec\u00adtiv\u00adi\u00adty may result from the desta\u00adbi\u00adliza\u00adtion of \u03b72-CH<sub>2<\/sub>O inter\u00adme\u00addi\u00adates in which the car\u00adbonyl group is par\u00adal\u00adlel to the sur\u00adface and bond\u00ading is by both the C and O atoms in favor of \u03b71-CH<sub>2<\/sub>O in which the car\u00adbonyl is per\u00adpen\u00addic\u00adu\u00adlar to the sur\u00adface and only the oxy\u00adgen inter\u00adacts with the met\u00adal. Pre\u00adsum\u00adably this lat\u00ader species is more resis\u00adtant to dehy\u00addro\u00adgena\u00adtion and reacts with hydrox\u00adyl groups to pro\u00adduce CO<sub>2<\/sub> and H<sub>2<\/sub>.<\/p>\n<p>In order to elu\u00adci\u00addate how alloy\u00ading with Zn affects the CH<sub>3<\/sub>OH dehy\u00addro\u00adgena\u00adtion activ\u00adi\u00adty of Pd, the struc\u00adture and reac\u00adtiv\u00adi\u00adty of mod\u00adel cat\u00ada\u00adlysts con\u00adsist\u00ading of sub\u00admono\u00adlay\u00ader amounts of Zn sup\u00adport\u00aded on a Pd(111) sin\u00adgle crys\u00adtal have been inves\u00adti\u00adgat\u00aded. I will present tem\u00adper\u00ada\u00adture pro\u00adgrammed des\u00adorp\u00adtion (TPD) data for the reac\u00adtion of methanol and formalde\u00adhyde on Pd(111) as a func\u00adtion of Zn cov\u00ader\u00adage as well as results of a high res\u00ado\u00adlu\u00adtion elec\u00adtron ener\u00adgy loss spec\u00adtroscopy (HREELS) study of the bond\u00ading con\u00adfig\u00adu\u00adra\u00adtions of CO, CH<sub>2<\/sub>O, and CH<sub>3<\/sub>OH on Zn\/Pd(111) sur\u00adfaces. TPD data for the reac\u00adtion of methanol on Pd sup\u00adport\u00aded on ZnO(0001) sin\u00adgle crys\u00adtal sur\u00adfaces will also be pre\u00adsent\u00aded. The TPD data shows that the for\u00adma\u00adtion of the Pd Zn alloy severe\u00adly shuts down the dehy\u00addro\u00adgena\u00adtion of CH<sub>3<\/sub>OH and CH<sub>2<\/sub>O which cor\u00adre\u00adsponds to the increase in \u03b71-CH<sub>2<\/sub>O seen in the <acronym title=\"High Resolution Electron Energy Loss Spectroscopy\">HREELS<\/acronym>. Over\u00adall, these results pro\u00advide fun\u00adda\u00admen\u00adtal insight into how Zn alters the reac\u00adtiv\u00adi\u00adty of Pd for the dehy\u00addro\u00adgena\u00adtion of CH<sub>3<\/sub>OH and this insight is use\u00adful in elu\u00adci\u00addat\u00ading the mech\u00ada\u00adnism of the steam reform\u00ading of methanol on Pd\/ZnO cat\u00ada\u00adlysts.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>2007 Spring Sym\u00adpo\u00adsium &nbsp; Eseoghene Jero\u00adro and John M. Vohs Depart\u00adment of Chem\u00adi\u00adcal and Bio\u00admol\u00ade\u00adc\u00adu\u00adlar Engi\u00adneer\u00ading Uni\u00adver\u00adsi\u00adty of Penn\u00adsyl\u00adva\u00adnia Philadel\u00adphia, PA 19104\u20136393 USA ejeroro@\u200bseas.\u200bupenn.\u200bedu Abstract \u2014 Methanol and oth\u00ader alco\u00adhols are poten\u00adtial bio-renew\u00adable sources of hydro\u00adgen. The use of alco\u00adhols, how\u00adev\u00ader, as a source of H2 or for H2 stor\u00adage requires sta\u00adble reform\u00ading cat\u00ada\u00adlysts that [\u2026]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[15],"tags":[52],"class_list":["post-676","post","type-post","status-publish","format-standard","hentry","category-abstracts","tag-symposium"],"_links":{"self":[{"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/posts\/676","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/comments?post=676"}],"version-history":[{"count":11,"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/posts\/676\/revisions"}],"predecessor-version":[{"id":2465,"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/posts\/676\/revisions\/2465"}],"wp:attachment":[{"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/media?parent=676"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/categories?post=676"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/tags?post=676"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}