{"id":6465,"date":"2026-10-19T09:48:56","date_gmt":"2026-10-19T09:48:56","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-edlisfraedi-naveed-ashraf\/"},"modified":"2026-10-19T09:48:56","modified_gmt":"2026-10-19T09:48:56","slug":"doktorsvorn-i-edlisfraedi-naveed-ashraf","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-edlisfraedi-naveed-ashraf\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed e\u00f0lisfr\u00e6\u00f0i – Naveed Ashraf"},"content":{"rendered":"
\n
\n

Streymi \u00e1 Zoom:
<\/strong>https:\/\/eu01web.zoom.us\/j\/65235674889<\/a><\/strong><\/strong><\/p>\n

Doktorsefni:<\/strong> Naveed Ashraf<\/p>\n

Heiti ritger\u00f0ar:
<\/strong>Endurn\u00fdjanleg umbreyting CO2 \u00ed gr\u00e6nt eldsneyti<\/p>\n

Andm\u00e6lendur:
<\/strong>Dr. Samira Siahrostami, d\u00f3sent og a\u00f0sto\u00f0arforst\u00f6\u00f0uma\u00f0ur EDI; ranns\u00f3knarpr\u00f3fessor af stigi 2 hj\u00e1 Canada Research Chair \u00ed yfirbor\u00f0srafhv\u00f6rfum og rafefnafr\u00e6\u00f0ilegum umbreytingum, Efnafr\u00e6\u00f0ideild, Simon Fraser h\u00e1sk\u00f3la \u00ed Vancouver, Kanada
Dr. Ali Coskun, pr\u00f3fessor \u00ed Efnafr\u00e6\u00f0ideild \u00ed H\u00e1sk\u00f3lanum \u00ed Fribourg, Sviss<\/p>\n

Lei\u00f0beinandi:
<\/strong>Dr. Younes Abghoui, ranns\u00f3knad\u00f3sent vi\u00f0 E\u00f0lisv\u00edsindastofnun H\u00e1sk\u00f3la \u00cdslands
Dr. Einar \u00d6rn Sveinbj\u00f6rnsson, pr\u00f3fessor vi\u00f0 Raunv\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands<\/p>\n

Einnig \u00ed doktorsnefnd:
<\/strong>Dr. Egill Sk\u00falason, pr\u00f3fessor vi\u00f0 I\u00f0na\u00f0arverkfr\u00e6\u00f0i-, v\u00e9laverkfr\u00e6\u00f0i- og t\u00f6lvunarfr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands
Dr. Einar \u00d6rn Sveinbj\u00f6rnsson, pr\u00f3fessor vi\u00f0 Raunv\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands<\/p>\n

Doktorsv\u00f6rn st\u00fdrir:
<\/strong>Dr. Birgir Hrafnkelsson, pr\u00f3fessor og deildarforseti Raunv\u00edsindadeildar H\u00e1sk\u00f3la \u00cdslands<\/p>\n

\u00c1grip:
<\/strong>\u00d3h\u00f3fleg losun gr\u00f3\u00f0urh\u00fasalofttegunda hefur valdi\u00f0 verulegri h\u00e6ttu fyrir vistkerfi jar\u00f0ar og haft mikil \u00e1hrif \u00e1 umhverfi\u00f0. Vaxandi styrkur koltv\u00edox\u00ed\u00f0s (CO\u2082) vegna notkunar jar\u00f0efnaeldsneytis raskar n\u00e1tt\u00farulegum hringr\u00e1sum, eykur hl\u00fdnun jar\u00f0ar, veldur br\u00e1\u00f0nun j\u00f6kla og lei\u00f0ir til loftslagsbreytinga. \u00dev\u00ed er \u00fe\u00f6rf \u00e1 skj\u00f3tum a\u00f0ger\u00f0um til a\u00f0 binda CO\u2082 og umbreyta \u00fev\u00ed \u00ed endurn\u00fdjanlegt eldsneyti til a\u00f0 draga \u00far \u00feessum vanda. \u00cd \u00e1ratugi hafa v\u00edsindamenn unni\u00f0 a\u00f0 \u00fer\u00f3un kerfa sem geta fanga\u00f0 CO\u2082 og umbreytt \u00fev\u00ed \u00ed ver\u00f0m\u00e6t efni. Nokkrar a\u00f0fer\u00f0ir eru \u00ed bo\u00f0i til a\u00f0 breyta CO\u2082 \u00ed ver\u00f0m\u00e6ta afur\u00f0i, \u00fear \u00e1 me\u00f0al l\u00edfefnafr\u00e6\u00f0ilegar, varmaefnafr\u00e6\u00f0ilegar og lj\u00f3sefnafr\u00e6\u00f0ilegar a\u00f0fer\u00f0ir. \u00de\u00f3 eru rafefnafr\u00e6\u00f0ilegar a\u00f0fer\u00f0ir s\u00e9rstaklega hagst\u00e6\u00f0ar \u00fear sem \u00fe\u00e6r geta n\u00fdtt endurn\u00fdjanlega orku og \u00fear me\u00f0 dregi\u00f0 \u00far umhverfisspj\u00f6llum. Rafhv\u00f6rf eru talin lykil- og skilvirk t\u00e6kni til sj\u00e1lfb\u00e6rrar framlei\u00f0slu eldsneytis og efna me\u00f0 notkun endurn\u00fdjanlegra orkugjafa. \u00deessar a\u00f0fer\u00f0ir draga ekki a\u00f0eins \u00far magni CO\u2082 \u00ed andr\u00famsloftinu heldur eru \u00fe\u00e6r einnig \u00e1hrifar\u00edk lei\u00f0 til a\u00f0 m\u00e6ta \u00f6rt vaxandi orku\u00fe\u00f6rf me\u00f0 \u00fev\u00ed a\u00f0 breyta f\u00f6ngu\u00f0u CO\u2082 \u00ed eldsneyti eins og metan, metan\u00f3l, etan\u00f3l o.s.frv. \u00e1 endurn\u00fdjanlegan h\u00e1tt. \u00cd \u00feessari doktorsritger\u00f0 voru nota\u00f0ar n\u00fdjustu a\u00f0fer\u00f0ir \u00ed \u00fe\u00e9ttleikafallsfr\u00e6\u00f0i (e. Density Functional Theory, DFT) til a\u00f0 l\u00edkja eftir meira en 30 mismunandi yfirbor\u00f0um \u00ed umbreytingarm\u00e1lmkarb\u00ed\u00f0um (e. transition metal carbides, TMC) me\u00f0 steinsaltbyggingu, og \u00ed \u00feremur helstu fl\u00f6tum (100), (110) og (111), sem hvata fyrir koltv\u00edox\u00ed\u00f0 afoxunarhvarf (CO\u2082RR) og kolm\u00f3nox\u00ed\u00f0 afoxunarhvarf (CORR). Auk hef\u00f0bundinnar hvarflei\u00f0ar var Mars van Krevelen (MvK) hvarflei\u00f0in einnig ranns\u00f6ku\u00f0 sem er einstakt fyrir \u00feessi TMC efni vegna kristalbyggingar \u00feeirra. Fyrir CO\u2082 afoxun me\u00f0 hef\u00f0bundinni hvarflei\u00f0 reyndist (100) fl\u00f6tur vanad\u00edumkarb\u00ed\u00f0s (VC) reyndist mynda mauras\u00fdru vi\u00f0 upphafsspennu 0,0 V. (100) fl\u00f6tur \u00feungsteinskarb\u00ed\u00f0s (WC) s\u00fdndi mikla virkni fyrir myndun metan\u00f3ls vi\u00f0 -0,36 V. \u00c1 (110) fl\u00f6tum s\u00fdndi tantalkarb\u00ed\u00f0 (TaC) fram\u00farskarandi virkni fyrir C1 afur\u00f0ir, me\u00f0 myndun mauras\u00fdru vi\u00f0 0,0 V og metans vi\u00f0 -0,21 V. VC (110) fl\u00f6turinn s\u00fdndi einnig tilt\u00f6lulega mikla virkni fyrir myndun mauras\u00fdru (-0,36 V) og metan\u00f3ls (-0,50 V). WC (110) reyndist vera betri kostur fyrir myndun C2 afur\u00f0a, svo sem etan\u00f3ls, etans og et\u00fdlens, me\u00f0 tilt\u00f6lulega l\u00e1ga upphafsspennu upp \u00e1 -0,65 V. Fyrir CORR s\u00fdnir ranns\u00f3knin a\u00f0 CO binst yfirbor\u00f0i karb\u00ed\u00f0a me\u00f0 orkulosandi h\u00e6tti, \u00fear sem TaC (100) og TaC (110) voru sp\u00e1\u00f0 a\u00f0 hafa hvatavirkni fyrir myndun metans vi\u00f0 -0,32 V og -0,26 V, \u00ed s\u00f6mu r\u00f6\u00f0. Almennt s\u00fdnir greining \u00e1 bindingu CO\u2082 og CO a\u00f0 CO binst sterkari en CO\u2082, sem gerir CORR \u00e1hugaver\u00f0ara en CO\u2082RR \u00e1 TMC hv\u00f6tum. A\u00f0 auki reyndust (111) fl\u00f6tur vera minna \u00e1hugaver\u00f0ir fyrir CO\u2082 afoxun samanbori\u00f0 vi\u00f0 (100) og (110) fleti.<\/p>\n

Um doktorsefni\u00f0:
<\/strong>Naveed Ashraf f\u00e6ddist \u00e1ri\u00f0 1993 \u00ed Samahni, Azad Kashmir \u00ed Pakistan. Hann er giftur og eiginkona hans vinnur vi\u00f0 Sj\u00fakrah\u00fasi\u00f0 \u00e1 Akureyri (SAk) sem l\u00e6knir. Hann lauk meistarapr\u00f3fi (MSc) \u00ed e\u00f0lisfr\u00e6\u00f0i fr\u00e1 H\u00e1sk\u00f3lanum \u00ed Poonch \u00ed Rawalakot (AJK) \u00e1ri\u00f0 2016 og M.Phil.-gr\u00e1\u00f0u \u00ed e\u00f0lisfr\u00e6\u00f0i fr\u00e1 H\u00e1sk\u00f3lanum \u00ed Gujrat, Pakistan \u00e1ri\u00f0 2019. Ranns\u00f3knir hans \u00e1 meistaragr\u00e1\u00f0u \u00ed e\u00f0lisfr\u00e6\u00f0i beindust a\u00f0 t\u00f6lvureikniranns\u00f3knum \u00e1 tv\u00edv\u00ed\u00f0um efnum fyrir notkun \u00ed lit\u00edum-j\u00f3na-rafhl\u00f6\u00f0um. \u00c1 \u00e1runum 2019 til 2021 starfa\u00f0i hann sem lektor \u00ed e\u00f0lisfr\u00e6\u00f0i vi\u00f0 H\u00e1sk\u00f3lanum \u00ed Gujrat \u00ed Pakistan. \u00c1ri\u00f0 2023 h\u00f3f hann doktorsn\u00e1m \u00ed e\u00f0lisfr\u00e6\u00f0i vi\u00f0 H\u00e1sk\u00f3la \u00cdslands undir handlei\u00f0slu Dr. Younes Abghoui. Doktorsranns\u00f3knir hans beinist a\u00f0 \u00fer\u00f3un n\u00fdrra hvata me\u00f0 \u00fev\u00ed a\u00f0 nota \u00fe\u00e9ttleikafallsfr\u00e6\u00f0il\u00edk\u00f6n (DFT) til a\u00f0 umbreyta CO2 \u00ed sj\u00e1lfb\u00e6ra gr\u00e6na orkugjafa. \u00c1 doktorsn\u00e1mi s\u00ednu hlaut hann ranns\u00f3knarstyrki fr\u00e1 V\u00edsinda- og n\u00fdsk\u00f6punarsj\u00f3\u00f0i Orkuveitunnar \u00ed Reykjav\u00edk (VOR) og Landsvirkjun. \u00dear a\u00f0 auki hlaut hann Erasmus pl\u00fas starfsn\u00e1msstyrk og starfa\u00f0i sem gestarannsakandi vi\u00f0 T\u00e6knih\u00e1sk\u00f3lann \u00ed Danm\u00f6rku (DTU) \u00fear sem hann framkv\u00e6mdi tilraunir me\u00f0 CO2-afoxun (CO2RR). Ranns\u00f3knarvinna hans hefur leitt til nokkurra ritr\u00fdndra v\u00edsindagreina.<\/p>\n<\/div><\/div>","protected":false},"featured_media":5883,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_phd_date_start":"2026-03-16T13:00:00+00:00","_phd_date_end":"2026-03-16T15:00:00+00:00","_phd_location":"A\u00f0albygging H\u00e1t\u00ed\u00f0asalur","_phd_admission":"A\u00f0gangur \u00f3keypis","_phd_thesis_title":"Endurn\u00fdjanleg umbreyting CO2 \u00ed gr\u00e6nt eldsneyti","_phd_source_url":"https:\/\/gamli.hi.is\/vidburdir\/doktorsvorn_i_edlisfraedi_naveed_ashraf","_phd_source_node_id":"443456","_phd_source_type":"vidburdir","_phd_member_id":1008,"footnotes":""},"phd_school":[101,93],"phd_discipline":[105],"class_list":["post-6465","phd_defence","type-phd_defence","status-publish","has-post-thumbnail","hentry","phd_school-raunvisindadeild","phd_school-verkfraedi-og-natturuvisindasvid","phd_discipline-phd-i-edlisfraedi"],"_links":{"self":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6465","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence"}],"about":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/types\/phd_defence"}],"version-history":[{"count":0,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6465\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media\/5883"}],"wp:attachment":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media?parent=6465"}],"wp:term":[{"taxonomy":"phd_school","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_school?post=6465"},{"taxonomy":"phd_discipline","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_discipline?post=6465"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}