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Abstrak :
Suatu konsep baru sistem penghilangan merkuri yang dikembangkan dalam penelitian ini adalah merubah bentuk organomerkuri ke bentuk yang dapat di adsorp dengan cara impregnasi zeolit dengan senyawaan reduktor SnCl2. Adsorben Zeolit/SnCl2 di preparasi pada komposisi yang berbeda, mengandung 0,5 ? 10 % SnCl2 dalam adsorben. Hasil karakterisasi menunjukkan keberadaan Sn(II) pada permukaan zeolit dengan tidak merusak struktur zeolit. Hasil uji adsorpsi menunjukkan komposisi optimum adsorben adalah Zeolit/SnCl2 0,5 % wt dengan luas permukaan 15,72 m2/g. Zeolit klinoptilolit aktif tanpa impregnasi memberikan efisiensi adsorpsi 25,59 % dan pada Zeolit/SnCl2 0,5% wt efisiensi adsorpsinya sebesar 54,70 %. Hasil ini mengindikasikan bahwa penambahan SnCl2 dalam zeolit klipnotilolit aktif mampu meningkatkan efisiensi kemampuan adsorpsi merkuri dalam minyak mentah.

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A new concept of mercury removal system has been developed in this study is to change organomercury shape into a form that can be adsorp by impregnating clinoptilolite zeolite with SnCl2 as reductor. Preparation of clinoptilolite zeolite/SnCl2 adsorbent with different compositions, contain 0.5 - 10% SnCl2 in the adsorbent. Characterization results showed the presence of Sn(II) on the surface of the clinoptilolite zeolite with no damage to structure of clinoptilolite zeolite. Adsorption test carried out using a batch reactor to determine the ability of an adsorbent which has been in preparation. Test results showed the optimum adsorbent composition is 0.5 wt% Zeolit/SnCl2 with a surface area of 15.72 m2/g. Adsorption without impregnation of the actived clipnotilolite zeolite provided adsorption efficiency of 25.59 % and 0.5% wt Zeolit/SnCl2 adsorption efficiency of 54.70%. These results indicate that the addition of SnCl2 in the actived zeolite clinoptilolite be able to increase the efficiency of adsorption performance of mercury in crude oil.

Abstrak :
The main focus of this article was to investigate the potential of natural zeolite adsorbent for the removal of CO2 and H2S in biogas produced from palm oil mill effluent (POME) in fixed-bed column adsorption. The effects of the flowrates and dosage of the adsorbent on the CO2 adsorption were also studied. The surface area of the adsorbent was determined using the Brunauer, Emmett, and Teller (BET) model, while the pore size distribution was calculated according to the Barrett, Joyner, and Halenda (BJH) model. The morphology of the adsorbent was determined by field emission scanning electron microscopy and energy dispersive x-ray (FESEM-EDX) analysis. Before and after purification, the biogas was analyzed by gas chromatography with a thermal conductivity detector and polydimethylsiloxane as a column. Biogas from the POME, via the anaerobic digestion process, produced 89% CH4 and 11% CO2. The surface and structure of the clinoptilolite zeolites was modified by a strong acid (1M HCl), strong base (1M NaOH), and calcination at 450°C, and the surface area of the natural zeolites was reduced up to 16%. The working capability of CO2 adsorption by the modified zeolites decreased with increasing flow rates (100, 200, and 300 mL/min) of the biogas, with levels of CO2 at 106,906, 112,237, and 115,256 mg/L. The removal of the CO2 in the biogas by using adsorbent dosages of 1.5, 2.0, and 2.5 g was 97,878, 97,404 and 93,855 mg/L, respectively. The optimum purification of the biogas occurred under the flow rate of 100 mL/min and adsorbent dosage of 2.5 g. The high working capability of the modified zeolites for the removal of CO2 in the biogas was a key factor, and the most important characteristic for the adsorbent. The results indicate that clinoptilolite zeolites are promising adsorbent materials for both the purification and upgrading of biogas.

Abstrak :
The main focus of this article was to investigate the potential of natural zeolite adsorbent for the removal of CO2 and H2S in biogas produced from palm oil mill effluent (POME) in fixed-bed column adsorption. The effects of the flowrates and dosage of the adsorbent on the CO2 adsorption were also studied. The surface area of the adsorbent was determined using the Brunauer, Emmett, and Teller (BET) model, while the pore size distribution was calculated according to the Barrett, Joyner, and Halenda (BJH) model. The morphology of the adsorbent was determined by field emission scanning electron microscopy and energy dispersive x-ray (FESEM-EDX) analysis. Before and after purification, the biogas was analyzed by gas chromatography with a thermal conductivity detector and polydimethylsiloxane as a column. Biogas from the POME, via the anaerobic digestion process, produced 89% CH4 and 11% CO2. The surface and structure of the clinoptilolite zeolites was modified by a strong acid (1M HCl), strong base (1M NaOH), and calcination at 450°C, and the surface area of the natural zeolites was reduced up to 16%. The working capability of CO2 adsorption by the modified zeolites decreased with increasing flow rates (100, 200, and 300 mL/min) of the biogas, with levels of CO2 at 106,906, 112,237, and 115,256 mg/L. The removal of the CO2 in the biogas by using adsorbent dosages of 1.5, 2.0, and 2.5 g was 97,878, 97,404 and 93,855 mg/L, respectively. The optimum purification of the biogas occurred under the flow rate of 100 mL/min and adsorbent dosage of 2.5 g. The high working capability of the modified zeolites for the removal of CO2 in the biogas was a key factor, and the most important characteristic for the adsorbent. The results indicate that clinoptilolite zeolites are promising adsorbent materials for both the purification and upgrading of biogas.