The ungrind and grinded effects on the pore geometry and adsorption mechanism of the coal particles

The fundamental characteristics of the porous structure and adsorption capacity depend on the coal matrix's particle size. The porous structures are natural devices to control on adsorption mechanism of the material. Here we present an improved analytical method near to realistic approach to understand the fundamental characteristics of ungrind and grind coal particle properties. In this order, systematic analytical methods were adopted using a different analytical method referred to as the hand-pick sampling method, low-pressure and temperature adsorption on N-2 and CO2, and field emission scanning electron microscope (FESEM). Two prominent different results have been observed on N-2 low pressure and temperature adsorption efficiency on ungrinded particles averaged pore size 29.67 nm and BET-area 3.02 m(2)/g. While grinded particles increasing in pore size 32.59 nm and BET-area 1.90 m(2)/g. The ungrind particles have open pores connectivity that can allow the efficient gas molecules accessibility in mesopores to larger pores region so that the entire balance mechanism induced the higher adsorption capacity. The grinded particles disturbed by the intense crushing result from an increase and decrease in pore size and affect adsorption capacity. The analogy of CO2 isotherms and particles adsorption capacity have two significant mechanisms: high energy and low energy versus low energy towards high energy adsorption capacity. This analyzed mechanism helps to understand that the first stage of opening pores system and second stage of narrow opening pores system. This mechanism has revealed in vice versa phenomena as the first stage of narrow pore with lower adsorption and the second stage of open pores system is higher adsorption. The particles at size 0.18-0.25 mm, markedly distinct pore characteristics were visualized with high magnification on FESEM.

Automated summary

The particle size of coal has a significant impact on the porous structure and adsorption capacity. Analyzing the ungrind and grind coal particles revealed different adsorption efficiencies and characteristics. Ungrind particles have open pore connectivity, allowing efficient gas molecule accessibility for higher adsorption capacity, while grind particles are disrupted by intense crushing, affecting adsorption capacity.