Browsing by Author "Nasruddin, Nasruddin"
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Item Adsorpsi Isosterik CO2 Bertekanan Tinggi Pada Karbon Aktif dengan Persamaan Model Tóth(wahyu sari yeni, 2019-07-01) Martin, Awaludin; Suryawan, Bambang; Alhamid, Muhammad Idrus; Nasruddin, NasruddinHigh Pressure Adsorption Iisosteric CO2 on Activated Carbon by Tóth Equation Model. Adsorption Isostere Carbon dioxide (CO2) on Activated Carbon were found using Tóth equation model, cause the Tóth equation model have lower deviation value than Langmuir equation model. Adsorption isostere data will be use to predict the value of pressure and isotherm of temperature for adsorb the amount of CO2. In this research the maximum adsorption isostere CO2 on activated carbon is 35% from mass of activated carbon.Item Adsorpsi Isotermal Bertekanan Tinggi Hidrogen pada Karbon Aktif Granular Berbahan Dasar Batubara pada Temperatur 283 K dan 298 K(wahyu sari yeni, 2019-07-01) Martin, Awaludin; Nasruddin, Nasruddin; Kolata, JossyPenyimpanan hidrogen dengan cara adsorpsi pada karbon aktif merupakan suatu metode yang memberikan hasil lebih baik daripada metode penyimpanan dengan cara kompresi dan tercairkan. Dalam penelitian ini bertujuan untuk mengetahui kapasitas penyerapan hidrogen pada karbon aktif sebagai parameter pengukur pada proses penyimpanan. Selanjutnya, data hasil pengujian dimodelkan menggunakan persamaan adsorpsi isotermal, sehingga kapasitas penyerapan dapat dihitung secara teoritis. Pengujian adsorpsi isotermal hidrogen pada karbon aktif granular berbahan dasar batubara telah dilaksanakan dengan menggunakan metode volumetrik. Pengujian dilakukan pada temperatur isotermal 283 K dan 298 K sampai tekanan 3 MPa. Karbon aktif komersial dengan luas permukaan (ABET) sebesar 885 m2/g dan hidrogen dengan kemurnian 99,9999% telah dipilih dalam pengujian ini. Kapasitas penyerapan terbesar pada pengujian ini adalah 133,29×10-5 kg/kg pada temperatur 283,2 K dan tekanan 3 MPa. Proses adsorpsi pada temperatur yang lebih rendah memiliki kemampuan untuk menyimpan hidrogen dengan jumlah yang lebih besar. Selain itu, kapasitas penyerapan meningkat seiring dengan meningkatnya tekanan. Persamaan model Langmuir dan Langmuir-Freundlich digunakan untuk mengkorelasi data eksperimen. Persamaan Langmuir-Freundlich memiliki akurasi terbaik untuk memprediksi besarnya kapasitas penyerapan, dimana nilai simpangan antara data pengujian dengan data korelasi adalah 4,39%.Item Adsorpsi Isotermal Co2 Bertekanan Tinggi Pada Karbon Aktif Dengan Metoda Volumetrik(wahyu sari yeni, 2019-07-01) Martin, Awaludin; Suryawan, Bambang; Alhamid, Muhammad Idrus; Nasruddin, NasruddinSistem adsorpsi adalah salah satu cara atau metoda yang paling efektif untuk memisahkan CO2 dengan zat lainnya yang dihasilkan dari pembakaran bahan bakar fosil. Pada rancangan untuk aplikasi tersebut, disamping data karakteristik material berpori (adsorben), data penyerapan CO2 pada adsorben (kinetik dan thermodinamika) juga dibutuhkan. Penelitian ini bertujuan menghasilkan data adsorpsi isotermal pada tekanan sampai dengan 3,5 MPa dengan menggunakan metoda tak langsung (metoda volumetrik) pada temperatur isotermal 300, 308, 318 dan 338 K. Adsorben yang digunakan adalah karbon aktif berbahan dasar batubara Kalimantan Timur yang diproduksi dengan menggunakan metode aktivasi fisika (CO2) derngan luas permukaan karbon aktif (karbon aktif KT) adalah 668 m2/g dan volume porinya 0,47 mL/g. Karbon dioksida (CO2) yang digunakan adalah karbon dioksida high purity dengan kemurnian 99,9%. Data yang diperoleh dari hasil eksperimen kemudian dikorelasi dengan menggunakan model persamaan Langmuir dan Toth. Hasil penelitian menunjukkan bahwa Kapasitas penyerapan maksimum adalah 0,314 kg/kg pada temperatur 300 K dan tekanan equilibrium 3384,69 kPa. Hasil regresi data eksperimen dengan menggunakan model Langmuir dan Toth adalah 3,4% dan 1,7%.Item Adsorption Isotherms of CH4 on Activated Carbon from Indonesian Low Grade Coal(wahyu sari yeni, 2019-07-01) Martin, Awaludin; Loh, Wai Soong; Rahman, Kazi Afzalur; Thu, Kyaw; Surayawan, Bambang; Nasruddin, Nasruddin; Choon, KimThis article presents an experimental approach for the determination of the adsorption isotherms of methane on activated carbon that is essential for methane storage purposes. The experiments incorporated a constant-volume-variable-pressure (CVVP) apparatus, and two types of activated carbon have been investigated, namely, activated carbon derived from the low rank coal of the East of Kalimantan, Indonesia, and a Carbotech activated carbon. The isotherm results which cover temperatures from (300 to 318) K and pressures up to 3.5 MPa are analyzed using the Langmuir, T oth, and Dubinin-Astakhov (D-A) isotherm models. The heat of adsorption for the single component methane-activated carbon system, which is concentration- and temperature-dependent, is determined from the measured isotherm data.Item Adsorption Isotherms of Hydrogen on Granular Activated Carbon Derived From Coal and Derived From Coconut Shell(wahyu sari yeni, 2019-07-01) Nasruddin, Nasruddin; Martin, Awaludin; Alhamid, Muhammad Idrus; Tampubolon, DanielThe development of adsorption-based storage systems requires a basic understanding of the isotherms over a wide range of pressure and temperatures for various types of adsorbents. This research is to generate experimental isothermal adsorption data for the adsorption of hydrogen gas on activated carbon. The adsorption apparatus is based on a volumetric method, and the experiments were conducted at temperatures ranging from 273 to 308 K and pressures up to 4 MPa. Two types of activated carbon, (i) a granular coal from Indonesia and (ii) a coconut-shell activated carbon that is produced in the laboratory, were used in the experiments. The experimental data are analyzed using the Langmuir, Toth, and Langmuir–Freundlich isotherm modelsItem High-Pressure Adsorption Isotherms of Carbon Dioxide and Methane on Activated Carbon From Low-Grade Coal of Indonesia(wahyu sari yeni, 2019-07-01) Martin, Awaludin; Alhamid, Muhammad Idrus; Nasruddin, Nasruddin; Suryawan, Bambang; Loh, Wai Soong; Ismail, Azhar Bin; Chun, Wongee; Choon, KimAdsorption isotherms data of methane and carbon dioxide gases on the activated carbons were measured experimentally using a volumetric method with pressure and temperatures ranging from 0 to 3.5 MPa and 27 to 65°C, respectively. Two types of activated carbons, namely, (1) Kalimantan Timur type activated carbon, which is lab-produced from Indonesian low-grade coal and (2) a commercial (Carbotech) activated carbon were used. The adsorption isotherms obtained were found to belong to type 1 of the International Union of Pure and Applied Chemistry classification. The adsorption uptakes for both carbon dioxide and methane on commercial activated carbon are higher than for the Kalimantan Timur activated carbon. This is due to higher Brunauer–Emmet–Teller surface area and pore volume of the former. Langmuir and Tóth isotherm models are correlated to predict the experimental data with acceptable accuracy.Item Preparation of Activated Carbon by Physical Activation with Rotary Autoclave(wahyu sari yeni, 2019-07-01) Martin, Awaludin; Suryawan, Bambang; Alhamid, M. Idrus; Nasruddin, Nasruddin; Senoadi, SenoadiThe aim of this research is to produce activated carbon from Indonesian coal with rotary autoclave and the rotation of rotary autoclave is ± 6 rpm. In this research, after fill in the raw material to autoclave, activated carbon were produced with following processes: carbonization; coal were pyrolysed at temperature 300oC for 6 hour with flowed of oxygen and physical activation; After carbonization process coal were pyrolysed at temperature 950oC for 6 hour and CO2 were flowed into autoclave as activating agent up to 300 ml/minute. Iodine Number is a quality parameter of activated carbon was done at laboratory. The result of this research is the iodine number of activated carbon with vertical autoclave is higher than rotary autoclave. The maximum iodine number with vertical autoclave is 589.1 mg/g and with rotary autoclave is 247.63 mg/g.