Preparation and Characterization of Solid Base Catalyst from Wasted Coffee Grounds.

• Main Authors: HUNG-YU CHEN, 陳泓予
• Other Authors: TSONG-HUEI CHANG
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/y4ur63

碩士 === 明新科技大學 === 化學工程與材料科技系碩士在職專班 === 107 === ABSTRACT In this study, the optimum preparation conditions for the preparation of carbon-based solid base catalysts from waste coffee grounds were studied. The waste coffee grounds base materials prepared under three different conditions were mixed with four different aqueous solutions under the conditions of carbonization at 600 ~ 800 ° C. Samples were derived from sodium hydroxide (NaOH), potassium hydroxide (KOH), lithium hydroxide(LiOH), calcium hydroxide (Ca(OH)₂) aqueous solution. The prepared samples were characterized by ( CO₂ - TPD) and XRD. , UV-visible and hydrogen of NaBH4. 1. All the coffee grounds substrate was prepared with three different preparation conditions of activated charcoal, with 5M concentration of potassium hydroxide aqueous solution, XRD diffraction peak locate at the same angle 2θ ≈ 32.46 ∘ 2. All the prepared samples showed an absorption peak at about 240 ~ 400 nm. 3. CO₂ - TPD results showed that (D) series 1M potassium hydroxide aqueous solution activated charcoal have the maximum CO₂ - TPD peak area, and it is proved the carbon dioxide adsorptive ability is the best. The lower the concentration, the better the amount of carbon dioxide absorbed. 4. The hydrogen generation at 40° C of the 0.1g Co catalyst prepared by calcium hydroxide, with 50ml of 0.2M NaOH and 0.1M NaBH4 aqueous solutions , sodium hydroxide are 276.54ml. Keywords: waste coffee grounds, TPD, TPR, H2 generation, cobalt catalyst