Browsing P - Mathematics and Natural Sciences by Author "Subagyono, RR Dirgarini"

Now showing items 1-10 of 10

    • Adsorption of toluene and xylene from aqueous solution on SBA-15 from rice husk 

      Prestianggi, Y; Maylisa, N; Subagyono, RR Dirgarini; Sitorus, Saibun; Daniel (IOP Publishing Ltd., 2019-08-16)
      Synthesis of Santa Barbara Amorphous-15 (SBA-15) from rice husk ash (Oryza Sativa L.) as toluene and xylene adsorbents has been performed. SBA-15 was synthesised by the modified surfactant template method. SBA-15 from rice ...

    • Carbon monolith from Victorian brown coal for hydrogen storage 

      Alfadlil, B R; Knowles, Gregory P.; Parsa, M R; Subagyono, RR Dirgarini; Daniel; Chaffee, Alan L. (IOP Publishing Ltd., 2019-08-16)
      The application of carbon monolith from VBC (Victorian Brown Coal) for H2 storage has been studied. The storage capacities of the monolith were measured using an isothermal adsorption process at different temperatures and ...

    • Catalytic hydrotreating of bio-oil derived from Chlorococcum sp. 

      Subagyono, RR Dirgarini; Marshall, Marc; Jackson, W. Roy; Chaffee, Alan L. (IOP Publishing Ltd., 2018-05-08)
      Hydrotreating of bio-oil derived from Chlorococcum sp. in the absence of NiMo/Al-SBA-15 catalysts has been investigated. The silica alumina supports decreased product yields (DCM solubles and hydrocarbon gases) due to ...

    • Characterization of Slow Pyrolysis Products of Macaranga motleyana: Effect of Sample Size 

      Subagyono, RR Dirgarini; Puspitasari, Rika; Sanjaya, Ari Susandy; Suwinarti, Wiwin (IOP Publishing Ltd., 2020-06-30)
      The characterization of biocrude oil produced by slow pyrolysis of fast growing wood Macaranga motleyana has been conducted. Slow pyrolysis was carried out in a fixed bed pyrolysis reactor at 500 oC for 1 hour with a ...

    • CO2 adsorption on SBA-15: A molecular modelling 

      Subagyono, RR Dirgarini; Chaffee, Alan L. (IOP Publishing Ltd., 2018-05-08)
      A study on molecular modelling of CO2 adsorption on SBA-15 has been conducted. A model of SBA-15 with 5.6 nm pore diameter and 3.9 OH/nm2 was constructed and used for the molecular studies of CO2 adsorption. Adsorption of ...

    • Electron transfer study between hydrogen molecules and graphene surface 

      Nasri; Subagyono, RR Dirgarini; Gunawan, Rahmat (IOP Publishing Ltd., 2020-06-30)
      Electron transfer studies on the interaction of graphene surface and hydrogen (H2) molecules have been carried out. The calculations were based on the Density Functional Theory (DFT) with a basis set of Generalized-Gradi ...

    • PEI modified mesocellular siliceous foam: a novel sorbent for CO2 

      Subagyono, RR Dirgarini; Liang, Zhijian; Knowles, Gregory P.; Webley, Paul; Chaffee, Alan L. (Elsevier BV, 2011)
      A series of materials based on mesocellular siliceous foam (MCF) and SBA-15, but modified with branched and linear polyethyleneimine (PEI) were synthesized and investigated as CO2 adsorbents. PEI modified MCFs, have higher ...

    • Pyrolysis-GC/MS study of fast growing wood Macaranga gigantea 

      Subagyono, RR Dirgarini; Qi, Ying; Sanjaya, Ari Susandy; Amirta, Rudianto; Chaffee, Alan L. (IOP Publishing Ltd., 2019-08-16)
      Py-GC/MS study on fast growing wood Macaranga gigantea at different temperatures has been conducted. The pyrolysis yields and chemical compounds obtained based on the pyrograms of the biomass by Py-GC analyses were compared ...

    • Slow pyrolysis of fast growing wood Macaranga gigantea 

      Sinaga, Ruth Junita; Wijayanti, Ardiana; Asih, R D K; Subagyono, RR Dirgarini; Sanjaya, Ari Susandy (IOP Publishing Ltd., 2019-08-16)
      Slow pyrolysis of fast growing wood Macaranga gigantea has been studied. The product yields and chemical composition of products obtained from the experiments under different conditions (temperature, reaction time, sample ...

    • THERMO-CHEMICAL CONVERSION OF Chlorococcum sp. FOR SUSTAINABLE BIOFUEL 

      Subagyono, RR Dirgarini; Marshall, Marc; Jackson, W. Roy; Chaffee, Alan L. (American Chemical Society, 2013)