Ionic liquid-impregnated activated carbon for biohydrogen purification in an adsorption unit

29th Symposium of Malaysian Chemical Engineers 2016

Yusuf, N.Y.^1 ; Masdar, M.S.^1,2,3 ; Isahak, W.N.R.W.^1 ; Nordin, D.^1,2 ; Husaini, T.^3 ; Majlan, E.H.^3 ; Rejab, S.A.M.^4 ; Chew, C.L.^4

Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, UKM Bangi, Selangor

43600, Malaysia^1

Research Centre for Sustainable Process Technology (CESPRO), Faculty of Engineering and Built Environment, UKM Bangi, Selangor

43600, Malaysia^2

Fuel Cell Institute, Universiti Kebangsaan Malaysia, UKM Bangi, Selangor

43600, Malaysia^3

Sime Darby Research SDN. Bhd., Jalan Pulau Carey, Pulau Carey, Selangor

42960, Malaysia^4

关键词: Absorption and desorptions;    Adsorption technology;    Cryogenic distillations;    Impregnated activated carbon;    Operating parameters;    Physical and chemical properties;    Separation process;    Temperature and pressures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/206/1/012071/pdf
DOI  :  10.1088/1757-899X/206/1/012071

来源: IOP

【 摘 要 】

Biological methods for hydrogen production (biohydrogen) are known as energy intensive and can be operated at ambient temperature and pressure; however, consecutive productions such as purification and separation processes still remain challenging in the industry. Various techniques are used to purify and separate hydrogen. These techniques include the use of sorbents/solvents, membranes and cryogenic distillation. In this study, carbon dioxide (CO2) was purified and separated from biohydrogen to produce high purity hydrogen gas. CO2capture was studied using the activated carbon (AC) modified with the ionic liquid (IL) choline chloride as adsorbent. The physical and chemical properties of the adsorbents were characterized through XRD, FTIR, SEM-EDX, TGA, and BET analyses. The effects of IL loading, flow rate, temperature, and gas mixture were also investigated based on the absorption and desorption of CO2. The CO2level in the biohydrogen composition was analyzed using a CO2gas analyzer. The SEM image indicated that the IL homogeneously covered the AC surface. High IL dispersion inlet enhanced the capability of the adsorbent to capture CO2gas. The thermal stability and presence of the functionalized group of ILs on AC were analyzed by TGA and FTIR techniques, respectively. CO2adsorption experiments were conducted using a 1 L adsorber unit. Hence, adsorption technologies exhibit potential for biohydrogen purification and mainly affected by adsorbent ability and operating parameters. This research presents an improved biohydrogen technique based on adsorption technology with novel adsorbents. Two different types of commercial CO2adsorbents were used in the experiment. Results show that the IL/AC exhibited properties suitable for CO2adsorption. The IL/AC sample presented a high CO2uptake of 30 wt. % IL when treated at 30 °C for 6 h under a flow rate of 1 L/min. The presence of IL increased the selectivity of CO2removal during the adsorption process. This IL/AC can be regenerated for several times without any significant loss in the performance.