针对吸附强化乙醇水蒸气重整(SE-SRE)制氢技术,通过热力学分析和制氢实验,研究了硅酸锂加入乙醇重整的效果,并结合多种表征手段分析了掺杂K对硅酸锂的影响,进一步用实验方法探究了多种工艺条件对以掺钾硅酸锂为吸附剂的SE-SRE系统的影...针对吸附强化乙醇水蒸气重整(SE-SRE)制氢技术,通过热力学分析和制氢实验,研究了硅酸锂加入乙醇重整的效果,并结合多种表征手段分析了掺杂K对硅酸锂的影响,进一步用实验方法探究了多种工艺条件对以掺钾硅酸锂为吸附剂的SE-SRE系统的影响及该系统的循环稳定性.结果表明,硅酸锂加入乙醇重整提高了氢气产率,适量掺钾能改善硅酸锂的结晶度和孔隙特性,提升其吸附性能.SE-SRE系统的最佳工艺条件是:温度为525℃,空速为0.9 m L/(g·h),水醇体积比为8∶1,催化剂与吸附剂配比为1∶3,经过10次循环后SE-SRE系统仍能保持较高的二氧化碳吸附活性和氢气产率.展开更多
In this study, we developed a three-stage catalyst-adsorbent reactor for the catalytic hydrolysis of CF4. Each stage is composed of a catalyst bed followed by an adsorbent bed using Ca（OH）2 to remove HF. The three s...In this study, we developed a three-stage catalyst-adsorbent reactor for the catalytic hydrolysis of CF4. Each stage is composed of a catalyst bed followed by an adsorbent bed using Ca（OH）2 to remove HF. The three stages are connected in series to enhance the hydrolysis of CF4 and eliminate a scrubber to dissolve HF in water at the same time. With a 10 wt-% Ce/AlaO3 catalyst prepared by the incipient wetness method using boehmite and a granular calcium hydroxide as an adsorbent, the CF4 conversion in our proposed reactor was 7%-23% higher than that in a conventional single-bed catalytic reactor in the temperature range of 923-1023 K. In addition, experimental and numerical simulation （Aspen HYSYS） results showed a reasonable trend of increased CF4 conversion with the adsorbent added and these results can be used as a useful design guideline for our newly proposed multistage reactor system.展开更多
Sorption enhanced steam methane reforming（SE-SMR） was performed to maximize hydrogen production and contemporary remove COfrom the product stream using bi-functional sorbent-catalyst compounds.Samples were tested at...Sorption enhanced steam methane reforming（SE-SMR） was performed to maximize hydrogen production and contemporary remove COfrom the product stream using bi-functional sorbent-catalyst compounds.Samples were tested at two different scales: micro and laboratory. The CaO amount varied in the CaO-CaAlOsorbent system synthesized by wet mixing(CaO content of 100 wt%, 56 wt%, 30 wt%, or 0 wt% and balance of CaAlO) which were upgraded to bi-functional compounds by impregnation of 3 wt% of Ni. Nitrogen adsorption（BET/BJH）, X-Ray Diffraction（XRD）, Temperature-Programmed Reduction（TPR） and Scanning and Transmission Electronic Microscopy（SEM and TEM, respectively） analyses were performed to characterize structural and textural properties and reducibility of the bi-functional materials and evaluate their catalytic behavior. A fixed sorbent composition CaO-CaAlO(56 wt% of CaO and CaAlObalance), was chosen to study the effect of different weight hourly space times（WHST） and CHstream compositions in SE-SMR activity. Impregnated mayenite at both micro and laboratory scales showed stable Hcontent of almost 74%, with CHconversion of 72% similarly to the values reported by the sample containing 30 wt% of CaO in the post-breakthrough.Sample with 30 wt% of CaO showed promisingly behavior, enhancing Hcontent up to almost 94.5%.When the sorption enhanced reaction is performed roughly 89% of CHconversion is achieved, and after the pre-breakthrough, the catalyst worked at the thermodynamic level. During cycling sorption/regeneration experiments, even if COremoval efficiency slightly decreases, CHconversion and Hyield remain stable.展开更多
文摘针对吸附强化乙醇水蒸气重整(SE-SRE)制氢技术,通过热力学分析和制氢实验,研究了硅酸锂加入乙醇重整的效果,并结合多种表征手段分析了掺杂K对硅酸锂的影响,进一步用实验方法探究了多种工艺条件对以掺钾硅酸锂为吸附剂的SE-SRE系统的影响及该系统的循环稳定性.结果表明,硅酸锂加入乙醇重整提高了氢气产率,适量掺钾能改善硅酸锂的结晶度和孔隙特性,提升其吸附性能.SE-SRE系统的最佳工艺条件是:温度为525℃,空速为0.9 m L/(g·h),水醇体积比为8∶1,催化剂与吸附剂配比为1∶3,经过10次循环后SE-SRE系统仍能保持较高的二氧化碳吸附活性和氢气产率.
文摘In this study, we developed a three-stage catalyst-adsorbent reactor for the catalytic hydrolysis of CF4. Each stage is composed of a catalyst bed followed by an adsorbent bed using Ca（OH）2 to remove HF. The three stages are connected in series to enhance the hydrolysis of CF4 and eliminate a scrubber to dissolve HF in water at the same time. With a 10 wt-% Ce/AlaO3 catalyst prepared by the incipient wetness method using boehmite and a granular calcium hydroxide as an adsorbent, the CF4 conversion in our proposed reactor was 7%-23% higher than that in a conventional single-bed catalytic reactor in the temperature range of 923-1023 K. In addition, experimental and numerical simulation （Aspen HYSYS） results showed a reasonable trend of increased CF4 conversion with the adsorbent added and these results can be used as a useful design guideline for our newly proposed multistage reactor system.
基金The financial support of European Contract 299732 UNIfHY(UNIQUE For HYdrogen production, funded by FCH-JU under the topic SP1-JTI-FCH.2011.2.3: Biomass-toHydrogen thermal conversion processes)
文摘Sorption enhanced steam methane reforming（SE-SMR） was performed to maximize hydrogen production and contemporary remove COfrom the product stream using bi-functional sorbent-catalyst compounds.Samples were tested at two different scales: micro and laboratory. The CaO amount varied in the CaO-CaAlOsorbent system synthesized by wet mixing(CaO content of 100 wt%, 56 wt%, 30 wt%, or 0 wt% and balance of CaAlO) which were upgraded to bi-functional compounds by impregnation of 3 wt% of Ni. Nitrogen adsorption（BET/BJH）, X-Ray Diffraction（XRD）, Temperature-Programmed Reduction（TPR） and Scanning and Transmission Electronic Microscopy（SEM and TEM, respectively） analyses were performed to characterize structural and textural properties and reducibility of the bi-functional materials and evaluate their catalytic behavior. A fixed sorbent composition CaO-CaAlO(56 wt% of CaO and CaAlObalance), was chosen to study the effect of different weight hourly space times（WHST） and CHstream compositions in SE-SMR activity. Impregnated mayenite at both micro and laboratory scales showed stable Hcontent of almost 74%, with CHconversion of 72% similarly to the values reported by the sample containing 30 wt% of CaO in the post-breakthrough.Sample with 30 wt% of CaO showed promisingly behavior, enhancing Hcontent up to almost 94.5%.When the sorption enhanced reaction is performed roughly 89% of CHconversion is achieved, and after the pre-breakthrough, the catalyst worked at the thermodynamic level. During cycling sorption/regeneration experiments, even if COremoval efficiency slightly decreases, CHconversion and Hyield remain stable.
