共查询到11条相似文献,搜索用时 62 毫秒
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中国科学院山西煤炭化学研究所与壳牌全球解决方案困际有限公司2008至2011年进行联合研发。研究将合成气转化为高级醇。研究人员发现,二氧化碳和甲烷的混合物是该转化:过程的副产品。联合研究团队利用纳米技术制备的新型干重整催化剂,回收了这些副产品用于循环生产合成气。这种新型催化剂的活性非常稳定,可以提高该工艺过程中的碳效率... 相似文献
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天然气制氢工艺技术研究进展 总被引:1,自引:0,他引:1
在未来的能源结构中氢能将占有越来越重要的地位。天然气制氢作为最经济的化石资源制氢过程在未来的20a仍然将在氢能领域占据主要地位。综述了国内外天然气制氢的技术工艺研究现状,进展及发展方向。介绍了各工艺的优缺点,现存的问题及各工艺需解决的关键问题。 相似文献
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Yang Su Liping L Weifeng Shen Shun an Wei 《Frontiers of Chemical Science and Engineering》2020,14(4):614
Steam methane reforming (SMR)-based methanol synthesis plants utilizing a single CO2 feed represent one of the predominant technologies for improving methanol yield and CO2 utilization. However, SMR alone cannot achieve full CO2 utilization, and a high water content accumulates if CO2 is only fed into the methanol reactor. In this study, a process integrating SMR with dry methane reforming to improve the conversion of both methane and CO2 is proposed. We also propose an innovative methanol production approach in which captured CO2 is introduced into both the SMR process and the recycle gas of the methanol synthesis loop. This dual CO2 feed approach aims to optimize the stoichiometric ratio of the reactants. Comparative evaluations are carried out from a techno-economic point of view, and the proposed process is demonstrated to be more efficient in terms of both methanol productivity and CO2 utilization than the existing stand-alone natural gas-based methanol process. 相似文献
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Matteo Maestri Dionisios G. Vlachos Alessandra Beretta Gianpiero Groppi Enrico Tronconi 《American Institute of Chemical Engineers》2009,55(4):993-1008
A microkinetic model capable of describing multiple processes related to the conversion of natural gas to syngas and hydrogen on Rh is derived. The parameters of microkinetic models are subject to (intrinsic) uncertainty arising from estimation. It is shown that intrinsic uncertainty could markedly affect even qualitative model predictions (e.g., the rate‐determining step). In order to render kinetic models predictive, we propose a hierarchical, data‐driven methodology, where microkinetic model analysis is combined with a comprehensive, kinetically relevant set of nearly isothermal experimental data. The new, thermodynamically consistent model is capable of predicting several processes, including methane steam and dry reforming, catalytic partial oxidation, H2 and CO rich combustion, water‐gas shift and its reverse at different temperatures, space velocities, compositions and reactant dilutions, using the measured Rh dispersion as an input. Comparison with other microkinetic models is undertaken. Finally, an uncertainty analysis assesses the effect of intrinsic uncertainty and catalyst heterogeneity on the overall model predictions. © 2009 American Institute of Chemical Engineers AIChE J, 2009 相似文献
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Yuanzheng Ge Tao He Zhiqi Wang Dezhi Han Jianqing Li Jingli Wu Jinhu Wu 《American Institute of Chemical Engineers》2020,66(1):e16772
The main challenge of chemical looping dry reforming of methane (CLDRM) is the development of a high-performance redox material. In this study, V2O3 was proved to be a unique redox material possessing high oxygen storage capacity (421.6 mg/g-V2O3, CH4 consumption base) and strong carbon-deposition suppressing capability. It can be reduced to carbide by CH4, and the carbide can be reoxidized to V2O3 with CO2. Based on this redox cycle, CH4 conversion with 99.5% CO selectivity coupled with efficient CO2 splitting to CO was realized successively. However, the CH4 conversion over pristine V2O3 is low (<50%) and not stable, therefore catalytic activation of C-H bonds combined with structural modification of V2O3 was carried out to accelerate the stoichiometric reactions and improve the redox stability. Finally, a maximum CH4 conversion of 81.7% with stable performance during cycles was reached, and further investigation confirmed the series reaction mechanism and identified the rate-controlling step. 相似文献
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由于煤富碳少氢,煤制烯烃过程生产1 t产品将排放约5.8 t CO2.与此同时,中国焦炭工业每年产生约7×1010 m3的副产物焦炉气,这些富氢的焦炉气大多被燃烧或直接排放进入大气,对环境造成严重影响的同时还浪费了巨大的经济价值.本文对焦炉气辅助煤制烯烃的新过程进行了建模模拟与系统分析.焦炉气与煤元素互补,焦炉气中的H2可用来调节合成气的氢碳比;CH4可通过甲烷水蒸气重整和甲烷干重整两个过程,提高合成气的氢碳比的同时降低煤制烯烃过程排放的CO2,提高碳元素利用率,实现节能减排.这个新的联供过程的能效比煤制烯烃过程提高了约10个百分点,而CO2排放量则减少了约95%. 相似文献
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采用常规的浸渍法制备了镍基催化剂和经过镧改性的镍基催化剂,研究了甲烷催化部分氧化制备含氮合成气的催化功能,结果说明,镍含量在8%时催化活性达到最好,同时加入镧进行改性后催化剂的活性和选择性有所提高;该催化剂对甲烷空气催化部分氧化制合成气在常压下具有较高的转化率,随压力升高,转化率明显下降,并且积极严重,通过向体系加入H2O和CO2可以提高加压条件下甲烷的转化率并抑制催化剂积碳,还可以获得H2/CO接近2的合成气,满足合成液体燃料的要求。 相似文献
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天然气常压无催化、部分氧化法在合成氨生产中的应用 总被引:1,自引:0,他引:1
介绍了以天然气常压无催化、部分氧化法替代常压重油部分氧化法生产合成氨原料气的技术改造,以及所取得的经济效益和社会效益。 相似文献
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简要分析了我公司发展甲醇产品的区位优势。对几种甲醇原料路线进行了比较,并对以焦炉煤气和转炉煤气为原料生产甲醇进行了物料衡算和经济效益分析,说明以焦炉煤气和转炉煤气为原料生产甲醇在技术经济方面的优势。 相似文献