2012 Spring Sym\u00adpo\u00adsium Yadan Tang, Charles A. Roberts, Israel Wachs Depart\u00adment of Chem\u00adi\u00adcal Engi\u00adneer\u00ading Lehigh Uni\u00adver\u00adsi\u00adty Abstract \u2014 Mea\u00adsured trends in cat\u00adalyt\u00adic reac\u00adtiv\u00adi\u00adty over vary\u00ading met\u00adal cat\u00ada\u00adlysts have been used to facil\u00adi\u00adtate the opti\u00admiza\u00adtion of bimetal\u00adlic catalysts.[1] An impor\u00adtant exam\u00adple of such a trend is the Sachtler-Fahren\u00ad\u00adfort vol\u00adcano curve, in which reac\u00adtiv\u00adi\u00adty of met\u00adal [\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":[],"class_list":["post-2369","post","type-post","status-publish","format-standard","hentry","category-abstracts"],"_links":{"self":[{"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/posts\/2369","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=2369"}],"version-history":[{"count":5,"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/posts\/2369\/revisions"}],"predecessor-version":[{"id":2561,"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/posts\/2369\/revisions\/2561"}],"wp:attachment":[{"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/media?parent=2369"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/categories?post=2369"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/catalysisclubphilly.org\/awe9a91v\/wp-json\/wp\/v2\/tags?post=2369"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nYadan Tang<\/strong>, Charles A. Roberts, Israel Wachs
\nDepart\u00adment of Chem\u00adi\u00adcal Engi\u00adneer\u00ading
\nLehigh Uni\u00adver\u00adsi\u00adty<\/em>
\n
\nAbstract<\/strong> \u2014 Mea\u00adsured trends in cat\u00adalyt\u00adic reac\u00adtiv\u00adi\u00adty over vary\u00ading met\u00adal cat\u00ada\u00adlysts have been used to facil\u00adi\u00adtate the opti\u00admiza\u00adtion of bimetal\u00adlic catalysts.[1] An impor\u00adtant exam\u00adple of such a trend is the Sachtler-Fahren\u00adfort vol\u00adcano curve, in which reac\u00adtiv\u00adi\u00adty of met\u00adal sur\u00adfaces for formic acid decom\u00adpo\u00adsi\u00adtion is plot\u00adted against the sta\u00adbil\u00adi\u00adty of inter\u00adme\u00addi\u00adates, i.e. the bulk heat of for\u00adma\u00adtion of the for\u00admate on a spe\u00adcif\u00adic met\u00adal surface.[2] It is ques\u00adtion\u00adable, how\u00adev\u00ader, to cor\u00adre\u00adlate a bulk prop\u00ader\u00adty with cat\u00adalyt\u00adic reac\u00adtiv\u00adi\u00adty, a process that occurs exclu\u00adsive\u00adly at the sur\u00adface. The cur\u00adrent study inves\u00adti\u00adgates the cor\u00adre\u00adla\u00adtion between formic acid decom\u00adpo\u00adsi\u00adtion and reac\u00adtiv\u00adi\u00adty of bulk met\u00adal cat\u00ada\u00adlysts (i.e. Fe, Ru, Pd, Pt, Au, Ag, Ni, Co, and Cu) using mod\u00adern tech\u00adniques such as in situ dif\u00adfuse reflectance infrared Fouri\u00ader trans\u00adform spec\u00adtroscopy (DRIFTS) and tem\u00adper\u00ada\u00adture pro\u00adgrammed sur\u00adface reac\u00adtion (TPSR) spec\u00adtroscopy. In situ DRIFTS mon\u00adi\u00adtors the for\u00admate struc\u00adture on the sur\u00adface of bulk met\u00adal cat\u00ada\u00adlysts dur\u00ading the adsorp\u00adtion and decom\u00adpo\u00adsi\u00adtion of formic acid. By uti\u00adliz\u00ading a tem\u00adper\u00ada\u00adture ramp\u00ading pro\u00adce\u00addure, in situ DRIFTS also pro\u00advides insights into ther\u00admal sta\u00adbil\u00adi\u00adty of adsorbed for\u00admates. TPSR spec\u00adtroscopy detects the tem\u00adper\u00ada\u00adture at which the peak activ\u00adi\u00adty for decom\u00adpo\u00adsi\u00adtion of the adsorbed for\u00admates occurs, there\u00adfore pro\u00advid\u00ading a mea\u00adsure of the reac\u00adtiv\u00adi\u00adty of the met\u00adal sur\u00adface. In situ DRIFTS and TPSR spec\u00adtroscopy exper\u00adi\u00adments agree with the pre\u00advi\u00adous report\u00aded find\u00ading that the decom\u00adpo\u00adsi\u00adtion of HCOOH pro\u00adceeds via two steps: 1) for\u00adma\u00adtion of sur\u00adface adsorbed for\u00admate (HCOO-M) inter\u00adme\u00addi\u00adates; and 2) decom\u00adpo\u00adsi\u00adtion of for\u00admate inter\u00adme\u00addi\u00adates into gas phase prod\u00aducts such as CO, CO2, H2 and H2O.[3] The for\u00admate struc\u00adture on var\u00adi\u00adous met\u00adal cat\u00ada\u00adlysts are iden\u00adti\u00adfied and assigned based on a pre\u00advi\u00adous study on formic acid via high res\u00ado\u00adlu\u00adtion elec\u00adtron ener\u00adgy loss spec\u00adtroscopy (HREELs).[3] The cur\u00adrent study finds that the for\u00admate species on Fe, Ru, Pd, Pt and Au are bridged; on Co and Ni are mon\u00adoden\u00adtate; and on Cu and Ag are con\u00advert\u00aded from mon\u00adoden\u00adtate to bridged at high\u00ader tem\u00adper\u00ada\u00adture in agree\u00adment with HREE\u00adLs work on both Cu(100) and Ag(110).[4] The TPSR decom\u00adpo\u00adsi\u00adtion tem\u00adper\u00ada\u00adtures, Tp, were plot\u00adted ver\u00adsus the bulk heat of for\u00adma\u00adtion of for\u00admates report\u00aded by Sachtler and Farenfort[2]. Rather than a vol\u00adcano trend, the plot is observed to con\u00adtain two dis\u00adtinct lin\u00adear rela\u00adtion\u00adships indi\u00adcat\u00ading that trends in reac\u00adtiv\u00adi\u00adty of met\u00adals should be eval\u00adu\u00adat\u00aded based on sur\u00adface prop\u00ader\u00adties rather than bulk.
\n
\n[1] Jacob\u00adsen, Claus J. H., Dahl, S., Clausen, Bjerne S., Bahn, S., Logadot\u00adtir, A., and N\u00f8rskov, Jens K. J. Am. Chem. Soc.<\/em> 123, 8404 (2001).
\n[2] Sachtler, W.M.H., and Fahren\u00adfort, J., in \u201cPro\u00adceed\u00adings, 2nd Inter\u00adna\u00adtion\u00adal Con\u00adgress on Catal\u00ady\u00adsis, Paris, 1960,<\/em>\u201d p.831. Tech\u00adnip, Paris, 1961.
\n[3] Colum\u00adbia, M.R., Thiel, P.A. J. Eelec\u00adtro\u00adan\u00ada\u00adlyt\u00adi\u00adcal Chem.<\/em> 369, 1\u201314 (1994).
\n[4] Sexton,B.A. Surf. Sci.<\/strong>, 88, 319 (1979).
\n
\nSpeaker\u2019s Biog\u00adra\u00adphy<\/strong> \u2014 Yadan Tang is a grad\u00adu\u00adate stu\u00addent in Chem\u00adistry at Lehigh Uni\u00adver\u00adsi\u00adty, advised by Pro\u00adfes\u00adsor Israel Wachs. She received her B.S. in Mate\u00adr\u00adi\u00adal Sci\u00adence and Engi\u00adneer\u00ading Depart\u00adment at East Chi\u00adna Univ. of Sci\u00adence and Tech\u00adnol\u00ado\u00adgy in 2006. She received her M.S. in Chem\u00adistry Depart\u00adment at Lehigh Univ in 2010. Since joined in Wachs group in 2011, she has been involved in formic acid decom\u00adpo\u00adsi\u00adtion on bulk met\u00adal cat\u00ada\u00adlyst and sup\u00adport\u00aded met\u00adal oxides on zeo\u00adlite. <\/p>\n","protected":false},"excerpt":{"rendered":"