Performance Study of Ni Catalyst with Quicklime (CaO) as CO₂ Adsorbent in Palm Kernel Shell Steam Gasification for Hydrogen Production

Abstract

There is a need to search for efficient material that reduce CO2 content and enhance the hydrogen composition in the product gas from biomass steam gasification particularly for large scale production. The present study was carried out to perform the characterization of commercial quicklime as CO2 absorbent and Ni powder as catalyst. The chemical composition of the materials perform using x-ray fluorescence (XRF) indicated high amount of CaO and Ni in the bulk samples. Using XRF and SEM analyses, it was found that both materials showed high crystalinity. The adsorption isotherm from physisorption analysis suggested that the materials exhibits Type II category according to the IUPAC classification scheme. These types of material exhibit mesoporous structure which was also verified by the pore size of the samples found via BET analysis. The BET surface area reported was 4.16 m2/g and 0.78 m2/g for quicklime and Ni powder, respectively. In conclusion, commercial quicklime has the potential as CO2 absorbent, based on the pore size and surface area. Conversely, the surface properties of the Ni powder were found relatively lower as compared to other commercial catalysts available for biomass steam gasification.

Adsorption Characteristics of Gas Molecules (H2O, CO2, CO, CH4, and H2) on CaO-Based Catalysts during Biomass Thermal Conversion with in Situ CO2 Capture

“…[1][2][3][4][5]. The in situ CO 2 capture is the core process for the research and development of this technology because it can effectively remove CO 2 , adjust the gas composition, and improve the quality of pyrolysis gas [6][7][8][9][10]. In order to enhance CO 2 adsorption capacity, CaO-based catalysts have been studied in biomass thermochemical conversion with in situ CO 2 capture [1][2][3][11][12][13][14][15][16].…”

Characterization and Reactivity Study of Coal Bottom Ash for Utilization in Biomass Gasification as an Adsorbent/Catalyst for Cleaner Fuel Production

“…However, the loop in Figure appears to be connected from P / P 0 = 1 to P / P 0 = 0.2, which revealed the presence of the microporous and mesopore phase simultaneously in the catalyst. Moreover, the analysis shows that the pore volume is 0.033 cm 3 /g, which is significantly higher than the pore volume of the catalyst used by Khan et al, namely, Ni (0.0016 cm 3 /g) and CaO (0.019 cm 3 /g). The pore width is approximately 5.0 nm, which places it in the mesoporous group.…”

“…The pore width is approximately 5.0 nm, which places it in the mesoporous group. The surface area measured by BET is 51.0 m 2 /g, which is higher compared to CaO and Ni used in biomass gasification by Khan et al The higher surface area could offer good physical adsorption of CO 2 . The bulk density measured by the water displacement method is 1400 kg/m 3 and the particle density is 2530 kg/m 3 (measured by pycnometer) as illustrated in Table .…”

Integrated catalytic adsorption steam gasification in a bubbling fluidized bed for enhanced H2 production: perspective of design and pilot plant experiences

“…The main source of the quicklime is naturally occurring limestone, which is abundant in the local area of Perak, Malaysia. The physical properties and chemical composition are shown in Table . Based on their properties, these materials are well represented by the (sandlike) Geldart particle B, which represents good fluidization characteristics to achieve better heat and mass transfer rates to keep an homogeneous temperature all over the bed.…”

“…MgCO 3 Table 2. Physical properties and chemical composition of CaO (bed material) 30 and steam. 31,32 Bed material (CaO) In the Field: Integrated catalytic adsorption steam gasification in a bubbling fluidized bed Z Khan et al…”