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All Journal International Journal Of Science, Technology & Management (IJSTM) Automotive Experiences
Wicaksana, Hangga
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Performance of Transition Metal Supported Al2O3 Coated on Honeycomb Catalysts and Its Segmentation on Exhaust Gasses Oxidation Buwono, Haris Puspito; Wicaksana, Hangga; Hartono, Moh; Waluyo, Joko; Daroini, Moch. Fauzun; Muslim, Ilham Taufik; Machida, Masato
Automotive Experiences Vol 7 No 1 (2024)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.10686

Abstract

The oxidation of carbon monoxide (CO) and unburnt hydrocarbons (HC) under segmented honeycomb catalysts was investigated using actual exhaust gas mixtures from a gasoline-fueled internal combustion engine of a motorcycle. The honeycomb catalysts were prepared through a wet process, resulting in four types coated with transition metals (Cu, Cr, Fe, and Ni) supported on Al2O3. The oxidation of CO and HC was monitored using an exhaust gas analyzer across a range of air-to-fuel ratios (AFR), from lean to rich, under stationary conditions. The results demonstrate that the honeycomb catalysts effectively decreased CO and HC concentrations in the exhaust gas. Among the transition metal oxide honeycomb catalysts, Cr and Ni exhibited high CO and HC conversion rates, surpassing those observed with Cu. The average CO and HC conversion calculations, spanning from lean to rich air-to-fuel ratios, were consistent with the actual conversion rates achieved. Furthermore, the study investigated the effect of honeycomb segmentation on CO and HC conversion. Surprisingly, the catalytic performance of Cr and Ni remained high even with longer gaps in the honeycomb. Interestingly, the conversion of CO and HC over the iron oxide honeycomb catalyst increased as the gap in the honeycomb became longer. This is likely due to an increase in the gap size and enhanced re-mixing of reactants (CO, HC, and O2) caused by recirculation. Thus, this study provides valuable elucidation on the potential application of segmented honeycomb catalysts for reducing CO and HC emissions in exhaust gases.
The Effect Of Transformational Leadership And Competence On Performance Through Compensation As An Intervening Variable Amin, Mat; Wicaksana, Hangga; Suhardi, Suhardi
International Journal of Science, Technology & Management Vol. 4 No. 2 (2023): March 2023
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v4i2.775

Abstract

This study aims to determine and analyze the influence of leadership and competence on employee performance, locus of study at Bapedalitbangda Pangkalpinang City, with a total of 53 respondents. Data collection was carried out by distributing questionnaires, with data processing techniques using the PLS SEM model. From the test results, it was found that leadership style has a positive and significant effect on performance and compensation. Compensation has a positive and significant effect on performance, but competence has a positive but not significant effect on performance. Compensation has a positive but not significant effect on compensation. The effect of leadership style on performance with compensation as an intervening variable has a positive and significant effect, and the effect of competence on performance with compensation as an intervening variable shows positive results but not significantly. In improving the performance of Bappedalitbangda Pangkalpinang City employees, it is better to pay more attention to leadership style, increase competence, improve compensation so that it has a significant influence in improving employee performance according to performance evaluation and their respective duties and functions.
Co-Authors Amin, Mat Daroini, Moch. Fauzun Haris Puspito Buwono Hartono, Moh Joko Waluyo Machida, Masato Muslim, Ilham Taufik Suhardi Suhardi