在K－Fe－MnO／Silicalite－2催化剂上合成气转化为低碳烯烃的研究Ⅱ．MnO助剂的作用

在Ｓｉｌｉｃａｌｉｔｅ－２分子筛担载的Ｋ－Ｆｅ／Ｓｉ－２催化剂体系中添加ＭｎＯ助剂，可明显提高ＣＯ／Ｈ２转化为低碳烯烃的选择性及催化活性。ＭｎＯ助剂能促进Ｋ－Ｆｅ／Ｓｉ－２催化剂中铁的还原，增加催化剂表面活性中心位，从而提高催化剂对ＣＯ的吸附容量，提高催化剂活性；ＭｎＯ助剂能抑制催化剂表面乙烯、丙烯加氢反应，从而有利于提高低碳烯烃选择性。     

粗合成气甲烷含量与水煤浆气化温度关系初探

用ＡＳＰＥＮＰＬＵＳ对高压水煤浆气化过程做了模拟计算，得到不同气化温度下的粗合成气中甲烷含量，为实际生产中间接预测气化炉温度提供参考。     

Large enhancement in methane-to-syngas conversion activity of supported Ni catalysts due to precoating of catalyst supports with MgO,CaO or rare-earth oxide

Supported nickel catalysts prepared using commercial sintered low surface area porous catalyst carriers (containing SiO₂ and/or Al₂O₃) precoated with MgO, CaO or rare-earth oxide show very much higher activity, selectivity and productivity in methane-to-syngas conversion reactions, than the catalysts prepared using catalyst carriers without any precoating. Among the precoating metal oxides, the best performance is observed for MgO.     

IGCC系统中净燃气过热器的选型和设计

根据IGCC系统中净燃气过热器中流体的特点和参数,对净燃气过热器进行了选型和设计,提出了采用Aspen软件来确定合成气的物性参数,并将计算结果与采用Aspen软件计算的结果进行了对比,验证了本设计方法的正确性.     

废弃活性炭化学链气化制富氢合成气

以废弃活性炭为原料,以Fe4ATP6复合载氧体为载氧体,在间歇高温流化床中考察了废弃活性炭化学链气化制富氢合成气反应的较优条件及复合载氧体的循环反应特性。结果表明,Fe4ATP6复合载氧体具有提供晶格氧及催化气化的双重作用,显著提高了碳转化率,促进了废弃活性炭气化过程,反应活性良好。废弃活性炭化学链气化制富氢合成气的优化反应条件：900℃、水蒸气流量为0.25 g·min^-1、OC/C比为1。在上述条件下,碳转化率达92.15%,合成气产量达1.20 L·g^-1,其中H₂产量为1.09 L·g^-1,平均浓度为55.30%。10次循环实验表明Fe4ATP6复合载氧体的反应活性略有降低,通过SEM、XRD分析载氧体的表面形貌、物质组成发现,载氧体反应后结构变化较大,粒径减小,生成了无反应活性的硅酸铁。     

合成气一步法合成二甲醚研究

结合国内外二甲醚研究现状,从合成气一步法合成二甲醚的分类、工艺、热力学、动力学、催化剂等方面进行了阐述,并对合成气一步法制取二甲醚进行了技术评价。     

On methanethiol synthesis from H2S‐containing syngas over K2MoS4/SiO2 catalysts promoted with transition metal oxides

The catalysts K₂MoS₄/SiO₂ promoted with transition metal oxides Fe₂O₃, CoO, NiO and MnO₂ were prepared and used to catalyze the synthesis of methanethiol from H₂Scontaining syngas. The results of activity assay show that the catalysts promoted with Fe₂O₃, CoO and NiO can remarkably increase the hour space yield of methanethiol. Nevertheless, MnO₂ was found to have a disadvantageous effect on the selectivity of methanethiol. The results of XRD and XPS characterization indicate that the addition of the transition metal oxides promoters is in favor of the formation of a Mo–S–K active phase and also retards the decomposition of K₂MoS₄ to MoS₂, thereby suppressing both the deep reduction of Mo species and the formation of (S–S)² species, which are reflected by the increment of the concentration ratios of both Mo⁶⁺/Mo⁴⁺ and S²/(S–S)².     

Alcohol Synthesis from Syngas over K2CO3/CoS/MoS2 on Activated Carbon

Supported K₂CO₃/Co–MoS₂ on activated carbon was prepared by a co-impregnation technique and has been characterized by X-ray diffraction (XRD) and BET. Active ingredients ranged from 39 to 66% and included molysulfide and cobalt sulfide. XRD analysis indicates that cobalt and molybdenum sulfides are found in the Co₃S₄ and Co₉S₈ phases. These catalysts were performance tested in a fixed-bed reactor under higher alcohol synthesis conditions, 2000–2400 psig and 270–330°C. Active chemicals on the carbon extrudates decreased the surface area dramatically, as measured by BET. Surprisingly, at the high level of active chemicals, alcohol productivity and selectivity were decreased. An increase in the reaction temperature led to a decrease in the selectivity of methanol and an increase in selectivity of hydrocarbons. Total alcohol productivity was also increased as gas hourly space velocity (GHSV) was increased. Co₉S₈ may play a role in the catalyst aging process. In prolonged reaction periods (140 h), sulfur is lost from the surface, possibly as H₂S. The quantity of Co₉S₈ on the surface appears to increase as the catalyst ages.     

NO x -Catalyzed Gas-Phase Activation of Methane: A Reaction Study

The catalytic effect of NO _x on methane oxidation in the absence of any solid catalyst has been investigated. The experimental results show that NO _x has very good catalytic activity in the partial oxidation of methane. The predominant products for reactions in a CH₄-O₂-NO _x co-feed mode are CO, CO₂, H₂O and H₂, CH₃OH, HCHO, and C₂H₄. Aromatics are also observed.     

CH4/CD4 isotope effects in the carbon dioxide reforming of methane to syngas over SiO2-supported nickel catalysts

By performing the CH₄ + CO₂ and CD₄ + CO₂ reactions alternately over SiO₂-supported nickel catalysts in a pulse micro-reactor, normal deuterium isotope effects on both the methane conversion reaction and on the CO formation reaction have been observed in the process of CO₂ reforming of methane. Based on the observed CH₄/CD₄ isotope effects, the pathways for the formation of CO are discussed.