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首页> 外文会议>International Conference on Fuel Cell Science, Engineering, and Technology >HYDROGEN PRODUCTION FOR PEM FUEL CELLS VIA OXIDATIVE STEAM REFORMING OF METHANOL USING Cu-AI CATALYSTS MODIFIED WITH Ce AND Cr
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HYDROGEN PRODUCTION FOR PEM FUEL CELLS VIA OXIDATIVE STEAM REFORMING OF METHANOL USING Cu-AI CATALYSTS MODIFIED WITH Ce AND Cr

机译：使用Ce和Cr修饰的Cu-AI催化剂，通过氧化蒸汽重整甲醇的氧化蒸汽重整氢气的氢气产生

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The performance of Cu-Ce-Al-oxide and Cu-Cr-Al-oxide catalysts of varying compositions prepared by co-precipitation method was evaluated for the PEM fuel cell grade hydrogen production via oxidative steam reforming of methanol (OSRM). The limitations of partial oxidation and steam reforming of methanol for the hydrogen production for PEM fuel cell could be overcome using OSRM and can be performed auto-thermally with idealized reaction stoichiomatry. Catalysts surface area and pore volume were determined using N_2 adsorption-desorption method. The final elemental compositions were determined using atomic absorption spectroscopy. Crystalline phases of catalyst samples were determined by X-ray diffraction (XRD) technique. Temperature programmed reduction (TPR) demonstrated that the incorporation of Ce improved the copper reducibility significantly compared to Cr promoter. The OSRM was carried out in a fixed bed catalytic reactor. Reaction temperature, contact-time (W/F) and oxygen to methanol (O/M) molar ratio varied from 200-300°C, 3-21 kg_(cat) s mol~(-1) and 0-0.5 respectively. The steam to methanol (S/M) molar ratio=1.4 and pressure=l atm were kept constant. Catalyst Cu-Ce-Al:30-10-60 exhibited 100% methanol conversion and 152 mmol s~(-1) kg_(cat)~(-1) hydrogen production rate at 300°C with carbon monoxide formation as low as 1300 ppm, which reduces the load on preferential oxidation of CO to CO_2 (PROX) significantly before feeding the hydrogen rich stream to the PEM fuel cell as a feed. The higher catalytic performance of Ce containing catalysts was attributed to the improved Cu reducibility, higher surface area, and better copper dispersion. Reaction parameters were optimized in order to maximize the hydrogen production and to keep the CO formation as low as possible. The time-on-stream stability test showed that the Cu-Ce-Al-oxide catalysts subjected to a moderate deactivation compared to Cu-Cr-Al-oxide catalysts. The amount of carbon deposited onto the catalysts was determined using TG/DTA thermogravimetric analyzer. Cls spectra were obtained by surface analysis of post reaction catalysts using X-ray photoelectron spectroscopy (XPS) to investigate the nature of coke deposited.
机译：的Cu-Ce的Al氧化物和不同组成的的Cu-Cr-Al氧化物催化剂的性能制备共沉淀法通过氧化蒸汽甲醇（OSRM）的重整评价为PEM燃料电池级氢气的生产。可以克服使用OSRM克服PEM燃料电池氢产生的部分氧化和蒸汽重整的局限性，并且可以通过理想的反应化学体进行自动进行。使用N_2吸附 - 解吸方法测定催化剂表面积和孔体积。使用原子吸收光谱法测定最终的元素组合物。通过X射线衍射（XRD）技术测定催化剂样品的晶相。温度编程减少（TPR）证明CE的掺入与CR启动子相比显着显着显着。 OSRM在固定床催化反应器中进行。反应温度，接触时间（w / f）和氧氧（O / m）摩尔比的摩尔比分别不同于200-300℃，3-21kg_（CAT）Mol〜（-1）和0-0.5。蒸汽到甲醇（S / m）摩尔比= 1.4和压力= L ATM保持恒定。催化剂Cu-Ce-Al：30-10-60在300℃下表现出100％甲醇转化率和152mmol S〜（-1）kg_（猫）〜（-1）氢气产生速率，其一氧化碳形成低至1300 PPM，在将氢气富流入作为进料的PEM燃料电池之前，显着降低了CO至CO_2（PROx）的优先氧化的负荷。 Ce含Ce催化剂的较高催化性能归因于改善的Cu再还原性，更高的表面积和更好的铜分散体。优化反应参数以最大化氢气产生并保持CO形成尽可能低。对流时间稳定性试验表明，与Cu-Cr-α-氧化物催化剂相比，Cu-Ce-α-氧化物催化剂对中等失活进行。使用Tg / DTA热重分析仪测定沉积在催化剂上的碳的量。通过使用X射线光电子谱（XPS）的后反应催化剂的表面分析获得CLS光谱，以研究焦炭的性质。

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