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The present study is focused on the combustion behavior, performance and emissions of a modified diesel engine working on dual fuel mode with hydrogen as a gaseous fuel by the inclusion of tri-ethylene glycol mono methyl ether and alumina nanoparticles as fuel additives. The inclusion of tri-ethylene glycol mono methyl ether, alumina and hydrogen separately and simultaneously improved the net heat release with reduced cylinder pressure at high loads as compared with neat diesel. The brake thermal efficiency increased by 22.5% and 11.6% by the inclusion of tri-ethylene glycol mono methyl ether and hydrogen respectively at 50% load, when combined together, it was improved remarkably by 28.15%. The addition of alumina was responsible for a slight reduction in NO x formation at all loads, while it was incremented by hydrogen enrichment at the highest load as compared to pure diesel. The CO formation was incremented by the addition of alumina, while the CO 2 and HC formations were reduced up to 50% load, increased at 70% load. The CO, CO 2 , HC and smoke opacity were reduced with TGME and hydrogen enrichment, while the NO x formation was reduced up to 50% load, then increased at the higher load. • The H 2 enrichment incremented NHR by 21.7% at 356°CA. • A minimum ID of 11°CA was observed in case of D + TGME @5%. • BTE increased by 28.15% at a load of 50% for D + TGME @5% +H 2@35%. • For D + TGME @5% , combustion efficiency improved by 10.4%. • The HC formation was reduced by 21.8% for D + TGME @5% at 50% load. [ABSTRACT FROM AUTHOR]