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Characterization of La-promoted Ni/Al_2O_3 catalysts for hydrogen production from glycerol dry reforming

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Journal of Energy Chemistry 2014年第1期23卷 15-21页

作者： Kah Weng Siew Hua Chyn Lee jolius gimbun Chin Kui Cheng Centre of Excellence for Advanced Research in Fluid Flow Universiti Malaysia PahangLebuhraya Tun Razak26300 GambangKuantan PahangMalaysia Faculty of Chemical & Natural Resources Engineering Universiti Malaysia PahangLebuhraya Tun Razak26300 GambangKuantan PahangMalaysia

In the current paper, dry(CO2)-reforming of glycerol, a new reforming route, was carried out over alumina(Al2O3)-supported, non-promoted and lanthanum-promoted nickel(Ni) catalysts. Both sets of catalysts were synthesized via a wet co-impregnation procedure. Physicochemical characterization of the catalysts showed that the promoted catalyst possessed smaller metal crystallite size, hence higher metal dispersion compared to the virgin Ni/Al2O3catalyst. This was also corroborated by the surface images captured by the FESEM analysis. From temperature-programmed calcination analysis, the derivative weight profiles revealed two peaks, which represent a water elimination peak at a temperature range of 373 to 473 K followed by nickel nitrate decomposition from 473 to 573 K. In addition, BET surface area measurements gave 85.0 m2 g-1for the non-promoted Ni catalyst, whilst the promoted catalysts showed an average of 1% to 6% improvement depending on the La loadings. Significantly, reaction studies at 873 K showed that glycerol dry reforming successfully produced H2. The 2%La-Ni/Al2O3catalyst, which possessed the largest BET surface area, gave an optimum H2generation(9.70%) at a glycerol conversion of 24.5%.

关键词： Ni catalysts dry reforming lanthanide promotion reaction kinetics

Prediction of Particles-Air Movement in Silo during Filling Operation

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Open Journal of Inorganic Non 2014年第3期4卷 21-27页

作者： Siti Ilyani Rani jolius gimbun Badhrulhisham Abdul Aziz Faculty of Chemical & Natural Resources Engineering University Malaysia Pahang Gambang Malaysia Faculty of Chemical & Natural Resources Engineering University Malaysia Pahang Gambang Malaysia Center of Excellence for Advanced Research in Fluid Flow (CARIFF) University Malaysia Pahang Gambang Malaysia Faculty of Chemical Engineering Technology TATI University College Kemaman Malaysia Faculty of Chemical & Natural Resources Engineering University Malaysia Pahang Gambang Malaysia

Awareness of dust explosion hazards during silo filling operation is important for safety measures. Thus, information on particles-air flow field is required to assess the likelihood of the hazard. Flow field visualization via experimental investigation associated with difficulties and risks. Hence, in the present study, a modeling formulation using commercial computational fluid dynamics (CFD) code, FLUENT software was employed to predict an insight of flow field distribution, in terms of mean and root mean square (RMS) velocities vectors in cylindrical silo during axial filling. According to the simulation results, predicted flow field has a great influence to the silo height and distance to the silo wall due to gravitational force and movement of fugitive dust and re-circulation of air. The results showed that the predicted data were in very good agreement with experimental data obtained from the literature. The maximum error was around 10%. The study has gone some way towards enhancing our understanding of the particles-air behavior inside industrial equipments during filling operation.

关键词： Particles-Air Flow Field CFD Filling Silo

CO_2 reforming of glycerol over La-Ni/Al_2O_3 catalyst:A longevity evaluative study

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Journal of Energy Chemistry 2015年第3期24卷 366-373页

作者： Kah Weng Siew Hua Chyn Lee Maksudur R.Khan jolius gimbun Chin Kui Cheng Faculty of Chemical & Natural Resources Engineering Universiti Malaysia Pahang Centre of Excellence for Advanced Research in Fluid Flow Universiti Malaysia Pahang Rare Earth Research Centre Universiti Malaysia Pahang

This paper reports on the longevity of glycerol-dry（CO2） reforming over the lanthanum（La） promoted Ni/Al2O3 *** XRD results showed that the Ni particle was well-dispersed in the presence of La *** addition,via the NH3-TPD analysis,it was found that the La promoter has reduced the acidity of Ni catalyst which may have explained the mitigation of carbon *** was determined that the 3.0 wt% La-promoted Ni/Al2O3 catalyst possessed the largest BET specific surface area of 97 m2 ***,it yielded the best catalytic longevity performance with conversion attained more than 90%,even after 72 h of reaction ***,it can be confirmed that the presence of CO2 during the glycerol dry reforming was essential in reducing carbon deposition,most likely via gasification *** has ensured a stability of catalytic activity for a long reaction period（72 h）.

关键词： CO2reforming glycerol lanthanum longevity syngas

Catalytic performance of cement clinker supported nickel catalyst in glycerol dry reforming

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Journal of Energy Chemistry 2014年第5期23卷 645-656页

作者： Hua Chyn Lee Kah Weng Siew Maksudur R.Khan Sim Yee Chin jolius gimbun Chin Kui Cheng Faculty of Chemical & Natural Resources Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Gambang Kuantan Pahang Malaysia Centre of Excellence for Advanced Research in Fluid Flow Universiti Malaysia Pahang Lebuhraya Tun Razak 26300 Gambang Kuantan Pahang Malaysia

The paper reports the development of cement clinker-supported nickel （with metal loadings of 5 wt%, 10 wt%, 15 wt% and 20 wt%） catalysts for glycerol dry （CO2） reforming reaction. XRF results showed that CaO constituted 62.0% of cement clinker. The physicochemical characterization of the catalysts revealed 32-folds increment of BET surface area （SBET） with the addition of nickel metal into the cement clinker, which was also corroborated by FESEM images. Significantly, XRD results suggested different types of Ni oxides formation with Ni loading, whilst Ca3SiO5 and Ca2Al0.67Mn0.33FeO5 were the main crystallite species for pure cement clinker. Temperature-programmed reduction analysis yielded three domains of H2 reduction peaks, viz. centered at approximately 750 K referred to as type-Ⅰ peaks, another peaks at 820 K denoted as type-Ⅱ peaks and the highest reduction peaks, type-Ⅲ recorded at above 1000 K. 20 wt% Ni was found to be the best loading with the highest XG and H2 yield, whilst the lowest methanation activity. Syngas with lower H2/CO ratios （0.6 to 1.5） were readily produced from glycerol dry reforming at CO2-to-Glycerol feed ratio （CGR） of unity. Nonetheless, carbon deposit comprised of whisker type （Cv） and graphitic-like type （Cc） species were found to be in majority on 20 wt%Ni/CC catalysts.

关键词： cement clinker dry reforming glycerol nickel catalyst syngas

Influence of Solvent Polarity and Conditions on Extraction of Antioxidant, Flavonoids and Phenolic Content from A verrhoa bilimbi

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Journal of Food Science and Engineering 2014年第5期4卷 255-260页

作者： Norlia Muhamad Siti Aishah Muhmed Mashitah M. Yusoff jolius gimbun Faculty of Bioresources & Food Industry Universiti Sultan Zainal Abidin Tembila Campus Besut 22200 Terengganu Malaysia Faculty of Chemical and Natural Resources Engineering Univ. Malaysia Pahang Gambang 26300 Malaysia Faculty of Industrial Science and Technology Univ. Malaysia Pahang Gambang 26300 Malaysia Centre of Excellence for Advanced Research in Fluid Flow (CARIFF) Univ. Malaysia Pahang Gambang 26300 Malaysia

This paper presents the influence of solvent polarity and extraction conditions on the extraction of total flavonoid, total phenolic and antioxidants from Averrhoa bilimbi. The experiment was performed using a different solvent at different extraction conditions, including extraction time （15-240 min）, temperature （30-70 ℃） and agitation speed （50-300 rpm）. Results showed that yields of extraction varies with solvent polarity. Extraction using 50% aqueous methanol gives the highest antioxidant activity and flavonoid content. The highest total flavonoid content （193.3 μg quercetin equivalent/g dry weight）, total phenolic content （717.8 μg gallic acid equivalent/g dry weight） and antioxidant activity （77%） was achieved using 50% methanol, at 70 ℃ and agitation speed of 300 rpm. This work may be useful for obtaining higher bioactive compounds during the extraction process of A. bilimbi.

关键词： Extraction flavonoid belimbing buluh phenolic antioxidant.

Hydrogen as Carbon Gasifying Agent During Glycerol Steam Reforming over Bimetallic Co-Ni Catalyst

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Advances in Materials Physics and Chemistry 2012年第4期2卷 165-168页

作者： Chin Kui Cheng Rwi Hau Lim Anabil Ubil Sim Yee Chin jolius gimbun Faculty of Chemical & Natural Resources Engineering Universiti Malaysia Pahang Kuantan Malaysia

Alumina-supported bimetallic cobalt-nickel catalyst has been prepared and employed in a fixed-bed reactor for the direct production of synthesis gas from glycerol steam reforming. Physicochemical properties of the 5Co-10Ni/85Al2O3 catalyst were determined from N2-physisorption, H2-chemisorption, CO2 and NH3-temperature-programmed desorption measurements as well as X-ray diffraction analysis. Both weak and strong acid sites are present on the catalyst surface. The acidic:basic ratio is about 7. Carbon deposition was evident at 923 K;addition of H2 however has managed to reduce the carbon deposition. Significantly, this has resulted in the increment of CH4 formation rate, consistent with the increased carbon gasification and methanation. Carbon deposition was almost non-existent, particularly at 1023 K. In addition, the inclusion of hydrogen also has contributed to the decrease of CO2 and increase of CO formation rates. This was attributed to the reverse water-gas-shift reaction. Overall, both the CO2:CO and CO2:CH4 ratios decrease with the hydrogen partial pressure.

关键词： Carbon Deposition Catalyst Gasification Glycerol Steam Reforming

Biodiesel Production from Rubber Seed Oil Using A Limestone Based Catalyst

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Advances in Materials Physics and Chemistry 2012年第4期2卷 138-141页

作者： jolius gimbun Shahid Ali Chitra Charan Suri Charan Kanwal Liyana Amer Shah Nurul Hidayah Muhamad Ghazali Chin Kui Cheng Said Nurdin Faculty of Chemical Engineering and Natural Resources Centre of Excellence for Advanced Research in Fluid Flow (CARIFF) Faculty of Chemical Engineering and Natural Resources Centre of Excellence for Advanced Research in Fluid Flow (CARIFF) Universiti Malaysia Pahang 26300 Gambang Pahang Malaysia Faculty of Chemical Engineering and Natural Resources Centre of Excellence for Advanced Research in Fluid Flow (CARIFF) Universiti Malaysia Pahang 26300 Gambang Pahang Malaysia.

This paper presents the potential of limestone based catalyst for transesterification of high free fatty acid (FFA) rubber seed oil (RSO). Pre-calcinated limestone known as clinker was activated using methanol and transesterification was performed under reflux with constant stirring. Mineral composition of the catalyst was analysed using x-ray fluorescence (XRF) with in build x-ray diffraction (XRD). The rubber seed oil was obtained using both microwave and soxhlet extraction using hexane as solvent. FFA content and fatty acid methyl ester content were determined using gas chromatography mass spectrometry (GC-MS). The results showed an efficient conversion (up to 96.9%) of high FFA rubber seed oil to biodiesel. The results suggest that the catalyst employed in this work is not negatively affected by moisture and free fatty acids and can be recycled very easily without significant loss in its activity. The highest conversion of 96.9% was achieved from catalyst activated at 700°C, with catalyst loading of 5 wt. %;methanol to oil molar ratio of 5:1;reaction temperature of 65°C and reaction time of 4 hours. The biodiesel produced in this work is within the limits of specification described by American standard test method (ASTM D6751).

关键词： Biodiesel Microwave Extraction Cement Clinker Rubberseed Oil