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首页> 外文期刊>Catalysis for Sustainable Energy >Production of hydrogen from steam reforming of glycerol using nickel catalysts supported on Al2O3, CeO2 and ZrO2
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Production of hydrogen from steam reforming of glycerol using nickel catalysts supported on Al2O3, CeO2 and ZrO2

机译：使用负载在Al 2 O 3 ，CeO 2 和ZrO 2 上的镍催化剂由甘油的水蒸气重整制氢>

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摘要

Nickel catalysts supported on Al2O3, CeO2 and ZrO2 were prepared by wetimpregnation method and evaluated in steam reforming of glycerol. Thecatalysts were characterized by chemical composition, textural analysis,crystalline structure and reducibility. The structural characterization of thecatalysts revealed a good dispersion of Ni particles using the Al2O3 support,needing higher reduction temperature. The reactions were performedat 500°C with 10 vol.% glycerol solution in a continuous flow reactor.All catalysts showed conversions close to 100%. The selectivity to gasproducts and formation of liquid by-products were found to be dependenton the type of support. The H2 selectivity showed the following trend: ZrO2 Al2O3 ≈ CeO2. The catalyst supported on CeO2 showed low activityfor water-gas shift reaction, with the highest CO selectivity. All catalystspresented a low formation of CH4. In the liquid phase some by-productswere identified (hydroxyacetone, acetic acid, lactic acid, acetaldehyde,acrolein and ethanol) and secondary reaction routes were proposed.Coke formation was higher on Ni/Al2O3 catalyst, but no deactivation wasobserved during 8 h of reaction.
机译：通过湿法浸渍法制备了负载在Al2O3，CeO2和ZrO2上的镍催化剂，并进行了甘油的水蒸气重整。通过化学成分，结构分析，晶体结构和还原性对催化剂进行了表征。催化剂的结构表征表明，使用Al2O3载体可以很好地分散Ni颗粒，需要较高的还原温度。反应在连续流动反应器中于500°C和10％（体积）的甘油溶液中进行，所有催化剂的转化率均接近100％。发现对气体产物的选择性和液体副产物的形成取决于载体的类型。 H2的选择性表现出以下趋势：ZrO2> Al2O3≈CeO2。 CeO2负载的催化剂对水煤气变换反应活性低，具有最高的CO选择性。所有催化剂均表现出较低的CH4生成率。在液相中发现了一些副产物（羟基丙酮，乙酸，乳酸，乙醛，丙烯醛和乙醇）并提出了次级反应路线.Ni / Al2O3催化剂上的焦炭生成较高，但在反应8小时内未观察到失活。

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