Document Details

Document Type : Thesis 
Document Title :
INVESTIGATION OF ALKALI AND TRANSITION METALS PROMOTED MO2N CATALYSTS FOR HYDROGEN PRODUCTION BY AMMONIA DECOMPOSITION
دراسة و اختبار فلزات قلوية ومعادن انتقالية كمعضدات لحافز كيميائي من نيترات المولبديوم لإنتاج الهيدروجين بتحلل الأمونيا
 
Subject : Faculty of Engineering 
Document Language : Arabic 
Abstract : Thermal catalytic decomposition of ammonia for onboard generation of hydrogen for fuel cell application has been proven to be thermodynamically feasible at a temperature of 400⁰C and with ruthenium based catalysts a very high conversion was achieved at 450⁰C. The cost and availability of ruthenium made it industrially incompatible for commercial use, in proffering solution to this problem lead us to this work. In conformity with the objective of this thesis, the reactivity of alkali and transition metal nitride catalysts was explored. The sole objective is to develop and design a very active catalyst based on non-precious metals for ammonia decomposition at lower temperature (< 600 oC) suitable for Fuel Cell application in transportation vehicles. The results obtained revealed that of all the tested alkali metal promoted catalysts, K- Mo2N shows the highest catalytic activity following the trend K- Mo2N > Mo2N > Cs- Mo2N > Li- Mo2N. The main promoting effect is due to surface modification of the catalyst both electronically and structurally i.e. optimized catalyst basicity and well dispersion of active material sites and mainly elevating the role of hydrogen poisoning the active sites or enhancing the recombination of nitrogen atom on the active site. All the transition metal promoted catalysts showed better activities when compared to their alkali metal counterparts. The activity trend for the bimetallic nitride catalysts is as follows Ni2Mo3N > Co3Mo3N > Fe3Mo3N ≥ Mo2N. For this set of catalysts, Ni2Mo3N catalyst showed the best activity which is also the best of all the tested catalysts which gave > 97% conversion at a temperature as low as 525⁰C. Both Ni2Mo3N and Co3Mo3N showed complete conversion at temperature ≈ 550⁰C. 
Supervisor : Dr. Abdul Rahim Al-Zahrani 
Thesis Type : Master Thesis 
Publishing Year : 1439 AH
2018 AD 
Added Date : Tuesday, September 25, 2018 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
لطيف اكرودي جولاوشوJolaoso, Lateef AkoredeResearcherMaster 

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