Design and evaluation of a sustainable catalytic system for biomass conversion

Thesis Abstract

The escalating global demand for sustainable energy sources necessitates innovative approaches to biomass conversion that prioritize environmental stewardship and economic viability. This study addresses the critical challenge of developing an efficient, eco-friendly catalytic system capable of converting diverse biomass feedstocks into valuable biofuels and biochemicals, thereby reducing reliance on fossil fuels and mitigating greenhouse gas emissions. The primary aim was to design, synthesize, and evaluate a novel, sustainable catalytic system optimized for biomass transformation processes. Specific objectives included (1) synthesizing bio-based catalyst materials derived from renewable resources; (2) characterizing catalyst physicochemical properties using techniques such as X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and Brunauer–Emmett–Teller (BET) surface area analysis; (3) assessing catalytic activity through controlled laboratory conversions of lignocellulosic biomass, including corn stover and rice husks; and (4) evaluating catalyst reusability and environmental impact through lifecycle assessment. The research adopted an experimental research design emphasizing quantitative analysis, with the population comprising biomass feedstocks, catalyst samples, and reaction products. A purposive sampling technique was employed to select representative biomass types and catalyst formulations, resulting in a sample size of 30 biomass batches and 10 catalyst variants. Data collection instruments included spectroscopic and chromatographic techniques—gas chromatography-mass spectrometry (GC-MS) for product identification, high-performance liquid chromatography (HPLC) for quantifying conversion efficiency, and surface analysis instruments for catalyst characterization. The study also incorporated process monitoring through thermogravimetric analysis (TGA) and temperature-programmed desorption (TPD). Data analysis involved descriptive statistics to profile catalyst performance, analysis of variance (ANOVA) to compare catalytic efficiencies among variants, and regression analysis to correlate catalyst properties with conversion yields. Lifecycle assessment models were employed to quantify environmental impacts, following the guidelines of the Eco-Indicator 99 method. The expected key findings include the identification of a novel bio-derived catalyst exhibiting catalytic activity superior to conventional mineral-based alternatives, with conversion efficiencies exceeding 85% for lignocellulosic biomass to targeted biofuels at optimal reaction conditions. It is anticipated that the catalyst will demonstrate excellent stability and reusability over five consecutive reaction cycles, with minimal loss of activity. The lifecycle analysis is projected to confirm significantly reduced environmental impacts, including lower greenhouse gas emissions and energy consumption, relative to traditional systems. Furthermore, the study aims to elucidate the mechanistic pathways facilitated by the catalyst, supported by kinetic analysis and surface interaction studies. This research contributes new knowledge to the field of sustainable catalysis for biomass conversion by demonstrating the feasibility of using renewable, bio-based catalyst materials that align with principles of green chemistry and circular economy. It extends existing theories of heterogeneous catalysis, integrating the concepts of surface active site stabilization governed by bio-molecular interactions, and incorporates the framework of green engineering design. The findings are expected to provide a foundation for scalable biomass conversion technologies, fostering environmentally responsible energy production. In conclusion, the study recommends further optimization of catalyst synthesis protocols to enhance activity and durability, detailed pilot-scale evaluations, and comprehensive assessments of economic viability. The results encourage the adoption of bio-derived catalysts in industrial biomass processing and underscore the importance of integrating environmental impact assessments into catalyst development cycles, thereby advancing the sustainable energy agenda.