The brown gas or hydrogen-hydrogen-oxygen gas is considered as a hydrogen fuel with oxygen present in it. The effect of hydrogen-hydrogen-oxygen gas induction in a direct injection diesel engine using GT-POWER software is discussed in relation with the rate of pressure rise and heat release rate. The engine is modeled in GT-POWER environment. The single zone combustion model has been adapted with Woshini heat transfer model. In this model the effect of induction of hydrogen-hydrogen-oxygen gas has been incorporated and analyzed for 1, 3, and 5% of hydrogen-hydrogen-oxygen gas in volume basis. The injection rate is modified for accommodating the hydrogen-hydrogen-oxygen gas in the model. The results have given the promise of higher rate of heat release with shorter combustion duration. Higher levels of hydrogen-hydrogen-oxygen gas have shown the advanced start of combustion as well as reduce the combustion duration.

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The biooil is thermally cracked under catalytic environment in a catalytic cracking process. This process is able to replace the transesterification process to match the biofuel properties with diesel. In this study the silicon dioxide and cerium oxide were chosen as catalyst for cracking the jatropha vegetable oil. The catalytically cracked jatropha biofuel gas is delivered at constant rate to the inlet manifold of the diesel engine. Before and after cracking, the characteristics of the catalysts were analyzed using scanning electron microscope and X-ray diffraction. The condensed cracked jatropha biofuel properties were analyzed with the results of Fourier transform infrared spectroscopy, thermogravimetric analysis, and differential scanning calorimetry analysis, and it matches with the diesel fuel. From the experimental results, the increase in brake thermal efficiency of the engine with higher oxides of nitrogen emission was observed compared with diesel for both the catalytically cracked jatropha biofuels. Notably, SiO 2 as catalyst showed the better mixing towards homogeneity with higher performance and emission results than the CeO 2 as catalyst.

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