Siti Nurqurratulainie Binti Miskan creator author. text my 2023 2023 monographic eng xii, 93 pages : illustrations (some color) ; 30 cm. + 1 CD-ROM CO2 reforming CH4 (CRM) has been a promising approach to mitigate the CO2 and CH4 greenhouse gas emissions while evolving valuable syngas. The CRM reaction has been investigated extensively using a variety of supported metal catalysts, including Ni/zeolite-Y (Ni/HY). However, Ni/HY rapidly deactivated due to the carbon deposition and metal sintering, which arose from the weak metal-support interaction. Therefore, this study synthesizes and characterizes the modified fibrous zeolite-Y catalyst (FHY). Next, to examine the catalytic activity of synthesized FHY catalysts toward CRM. Ni/FHY catalysts were prepared by modifying HY into FHY using a microemulsion system coupled with the HY crystal-seed crystallization method, followed by the impregnation of Ni to the synthesized FHY and commercial HY. XRD, FTIR, BET, TEM, FESEM-EDX, CO2-TPD, and H2-TPR determined the properties of Ni/FHY. At the same time, CRM evaluation was conducted using a stainless steel fixed-bed reactor at a reaction temperature of 700 oC, gas hourly space velocity of 25,000 mL/g.h, and CH4/CO2 ratio of 1. The results showed that Ni/FHY (𝑋𝐶𝐻4=90.0%,𝑋𝐶𝑂2=85.9%,𝐻2/𝐶𝑂=0.85) possessed higher performance at a temperature of 700 oC compared to Ni/HY (𝑋𝐶𝐻4=85.9%,𝑋𝐶𝑂2=84.9%,𝐻2/𝐶𝑂=0.73) attributed to the fascinating characteristics of FHY that allowed a homogenous and better Ni distribution with a smaller Ni crystallite size, thus strengthening the metal-support interaction. The effect of Ni loadings (1, 3, 5, and 10 wt.%) showed that 5Ni/FHY had the best catalytic performance. The excellent performance of 5Ni/FHY because of the strong interaction between Si-O-Ni, the moderate size of the NiO crystallites (9.35 nm), and the even distribution of the active metals led to a strong synergistic effect between the Ni metal active sites and FHY. Moreover, the operating conditions of Ni/FHY over CRM were optimized using response surface methodology (RSM) under independent variables of reaction temperature (X1, 700-900 oC), gas hourly space velocity (X2, 15,000-35,000 mL/g.h), and CH4/CO2 ratio (X3, 1-3), with response variables of CH4 conversion (Y1), CO2 conversion (Y2), and H2/CO ratio (Y3). The optimal reaction conditions were found at X1 = 833 oC, X2 = 24,968 mL/g.h, and X3 = 2.08, with Y1 = 94.5%, Y2 = 88.3%, and Y3 = 1.02. This study also proved that the synthesized Ni/FHY catalyst was appreciably stable for 90 h time-on-stream with the performance of 𝑋𝐶𝐻4=93.5%,𝑋𝐶𝑂2=89.1% and could be regenerated by air. In summary, Ni/FHY was successfully synthesized and emerged as a high sustainability catalyst for efficient syngas production via CRM under optimal conditions generated from RSM. The 5Ni/FHY catalyst performed the best with high stability under optimum conditions generated by RSM and proved its ability to be regenerated by air. specialized Siti Nurqurratulainie Binti Miskan Faculty of Chemical and Process Engineering Technology Thesis (Master of Science) -- Universiti Malaysia Pahang – 2023 Includes bibliographical references Faculty of Chemical and Process Engineering Technology Dissertations Universities and colleges Dissertations Theses Dissertations THE0009652 (Local) UMP 230509 20251125110738.0 eng