H <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mrow/> <mml:mn>2</mml:mn> </mml:msub> </mml:math> -rich syngas production by sorption enhanced steam gasification of palm empty fruit bunch
Nabila Aprianti, Muhammad Faizal, Muhammad Said, Subriyer Nasir
Abstract
Hydrogen-rich syngas from palm empty fruit bunch has been produced using CaO and bentonite as absorbent and catalyst. The gasification process is carried out at 550–750 °C at atmospheric pressure in the fixed bed gasifier with steam to biomass ratio (S/B) of 0–2.5 and Ca/C ratio of 0–2. The results showed that CaO only acts as <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi mathvariant="normal">CO</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:math> absorbent during the process. Increasing the ratio of Ca/C and S/B has increased the concentration of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi mathvariant="normal">H</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:math> and absorption of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi mathvariant="normal">CO</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:math> in the syngas. The addition of CaO did not significantly increase the production of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi mathvariant="normal">CH</mml:mi> <mml:mn>4</mml:mn> </mml:msub> </mml:math> and CO in the syngas. The <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi mathvariant="normal">H</mml:mi> <mml:mn>2</mml:mn> </mml:msub> </mml:math> concentration reaches about 78.16 vol% at 700 °C and Ca/C 2.