Variation of the Pore Structure During Microwave Pyrolysis of Oil Shale

Abstract

In this research, semi-coke samples were produced in a modified microwave oven at different final temperatures at a constant incident microwave power (550 W). The pore structure of raw oil shale (OS) and semi-coke samples was measured by the method of low-temperature adsorption of nitrogen. The obtained adsorption/desorption isotherms of these samples were similar and could be categorized as type II isotherms in the IUPAC classification, and all hysteresis loops produced by OS and all semi-coke samples are very similar to H3 hysteresis loops. Specific surface area was calculated based on BET equation, and pore size distribution was calculated by BJH method. The analysis results showed that the final temperature has a great influence on specific surface area, specific pore volume and the development of mesopores. As compared with conventional pyrolysis, pore size distribution curves have two visible peaks near 2 nm and 4 nm.

Microwave-Assisted Pyrolysis of Oil Palm Biomass: Multi-Optimisation of Solid Char Yield and Its Calorific Value Using Response Surface Methodology

“…Similar behaviour was observed for PMF and PKS. These observations were also reported by other researcher on similar work by Domínguez et al (2006) on microwave pyrolysis of sewage sludge, Qing et al (2010) on pyrolysis of oil shale, Huang et al (2010)on rice husk and Salema and Ani (2011). Changes in power level resulted in unique temperature profiles for all the materials during microwave pyrolysis in the presence of absorber.…”

“…The calorific value (CV) of biomass char produced at 1,000 W is almost similar to the low rank coal (Mukah Balingian) (ca. 24 MJ/kg) (Qing et al, 2010). According to Biagini et al (2002), in ensuring an auto combustion of a fuel for a particular combustion process, the calorific value should be at least a value of 20 MJ/kg.…”

Pyrolysis Characteristics of Indonesian Oil Sand in a Fixed Bed

“…The specific surface area increases rapidly in the 300–450 °C range because at those temperatures begin the decomposition of organic matter and that releases a large amount of oil vapor and gas to increase the pore specific surface area. At about 550 °C, the specific surface area shows a downward trend because less oil vapor and gas are generated at this temperature. , Above 600 °C, the specific surface area increases again. The total pore volume and the total BET specific surface area show similar trends during pyrolysis.…”

Synthesis and Characterisation of Penta‐Bismuth Hepta‐Oxide Nitrate, Bi5O7NO3, as a New Adsorbent for Methyl Orange Removal from an Aqueous Solution

“…Based on the IUPAC classification, the shape of the N 2 adsorption-desorption isotherm of Bi 5 O 7 NO 3 ( Figure 5) belongs to type II isotherm, which implies the presence of certain amounts of macro-and mesopore walls in the sample 17 . The hysteresis loop of Bi 5 O 7 NO 3 was of type H3, which associates with plate-like particles giving rise to narrow slit-shaped pores 18 . The pore size distribution determined by the Barret-Joyner-Halenda (BJH) method can be observed in the inset of Figure 5.…”